TM-241A/241E TM-441A/441E - N3UJJ

m144MHz FM TRANSCEIVERTM-241A/241E430/440MHz FM TRANSCEIVERTM-441A/441E1200MHz FM TRANSCEIVERTM-5~41A/541 EINSTRUCTION MANUALKENWOOD CORPORATION'. .~862-0031-3012 11 10 09 08 07 06 05 04 03From The N3UJJ.COM Document Library

Thank you for purchasing this new transceiver.IMPORTANT:• Please r_e __ a __ d'--t-h-is_i_n-st-r-uction manual carefuli;lbefore placing your transceiver in service.'J ISAVE THlSINSTRUCTION MANUAL.CAUTION:~g trans-m-is-s-io-n or .extended operation i~fu;l! Hi···power mode might cause the rear of thi; !'transceiver to get warm. ·I Do not place the transceiver where the heat sink1(rear panel) might come in contact with plastic'or vinyl surfaces.This instruction Manual covers the following models.TM-241A: 144M Hz FM TRANSCEIVER(U.S.A. and general markets)TM-241E: 144M Hz FM TRANSCEIVER(U.K. and European markets)TM·441A: 440MHz FM TRANSCEIVER(U.S.A. only)TM-441A: 430MHz FM TRANSCEIVER(General markets)TM·441E: 430MHz FM TRANSCEIVER(U.K. and European markets)TM·541A: 1200MHz FM TRANSCEIVER(U.S.A. only)TM·541E: 1200MHz FM TRANSCEIVER(European markets)1NOTE:If disregarded, inconvenience only, no risk of Iequipment damage or personal injury.CAUTION:i Equip~ent damage may occur, but not personal /FCC WARNINGThis equipment generates or uses radio frequencyenergy. Changes or modifications to this equipmentmay cause harmful interference unless themodifications are expressly approved in the 1' instruction manual. The user could lose the authorityto operate this equipment if an unauthorized changeor modification is made.2From The N3UJJ.COM Document Library

CONTENTS1. BEFORE OPERATION . . . . . . . . . . .. .. . . . 42. SPECIFICATIONS .. .. . . . .. . . . . . . . . . .. . 63. ACCESSORIES .. .. .. . .. . . . .. . .. . . . . . . . 74. INSTALLATION INSTRUCTIONS . . . . . . 75. OPERATIONCONTROL FUNCTIONS.................. 10RECEIVER OPERATIONReception . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Frequency Selection . . . . . . . . . . . . . . . . . . . 17Frequency Step Selection . . . . . . . . . . . . . . 17Programmable VFO Tuning Limits . . . . . . 18ALT(TM-541A/Eonly).... .. . . . ... . . . ... 19TRANSMITTER OPERATION............. 20Time-out Timer (TOT) . . . . . . . . . . . . . . . . . 20MEMORYMicroprocessor Memory back-up . . . . . . . 21Initial State . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Microprocessor Initialization . . . . . . . . . . . 21Memory Channel . . . . . . . . . . . . . . . . . . . . . 21Memory Contents . . . . . . . . . . . . . . . . . . . . . 22Memory Entry . . . . . . . . . . . . . . . . . . . . . . . . 22Memory Channel Recall . . . . . . . . . . . . . . . 24Memory Shift . . . . . . . . . . . . . . . . . . . . . . . . . 24SCANScan Operation . . . . . . . . . . . . . . . . . . . . . . . 25Hold/Resume Programming . . . . . . . . . . . 25Band Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Programmable Band Scan . . . . . . . . . . . . . 26Memory Channel Scan . . . . . . . . . . . . . . . . 27Memory Channel Lockout . . . . . . . . . . . . . 27Priority Alert Function . . . . . . . . . . . . . . . . 28REPEATER OPERATIONSTransmitter Offsets . . . . . . . . . . . . . . . . . . . 28Reverse Function . . . . . . . . . . . . . . . . . . . . . 29Tone Operation . . . . . . . . . . . . . . . . . . . . . . 29Tone Frequency Selection . . . . . . . . . . . . . 29Autopatch (U.S.A. version only) . . . . . . . . 30TONE/ CTCSS OPERATION.......... 30DTSS (Dual Tone Squelch System)OPERATION .. . .. .. . .. .. .. . .. .. .. .. .. 31DRS (Digital Recording System)OPERATION . .. .. .. . .. . .. .. .. .. . .. . . . 34PAGING .. ... . . .. .. .. . .. . .. . .. . .... .. 41TONE ALERT SYSTEM .. .. . .. .. . . . .. . 47APO (Automatic Power Off) . . . . . . . . . . . . 48DIM(Dimmer) . . . . . . . . . . . . . . . . . . . . . . . . . 48BEEP................................. 49LOCK/A.LOCK . . .. .. . . .. . .. .. .. . .. . .. 496. BLOCK DIAGRAM andSCHEMA TIC DIAGRAM . . Another sheet7. MAINTENANCE .. .. .. .. .. .. . .. . . .. .. 50IN CASE OF DIFFICULTY . .. .. .. .. .. 518. OPTIONAL ACCESSORIES . . . . . . . . . . . 523From The N3UJJ.COM Document Library

IAWIRIIIIIG[ BEFORE OPERATIONTO PREVENT ELECTRIC SHOCK, FIRE AND OTHERINJURY. PLEASE NOTE THE FOLLOWINGS:The power requirement is 13.8 VDC.Never attempt connection to a 24 VDC source.Do not place the unit in areas off excessive dust, highhumidity or on unstable surfaces.Do not place this unit,where it will be exposed to directsunlight or close to heating appliances.Y?J;2t\\. ~-'~~-- -~~-, "~~~..-::-'-+-'!To ensure good ventilation, do not put anything on topof the cabinet and allow at least 15 em (6 inches) ofspace behind the unit.Do not drop pieces of metal, needles, coins and otherelectrically conductive materials into the unit.4From The N3UJJ.COM Document Library

Do not touch the power plug, when your hands arewet.CLEANING1. Turn the power off, before cleaning the unit.2. Do not use any type of abrasive pad, thinner,benzine or any substances which may damage theunit.3. Wipe the front panel and other exterior surfaces ofthe unit with a soft dry cloth or a soft cloth lightlymoistened with water.Do not pull the power cord, when disconnecting it fromthe AC wall outlet. Grasp the plug and ensure that yourfingers do not touch the live pins.If an abnormal odor or smoke is detected, immediatelyturn the power oft and pull out the power plug.Contact the KENWOOD service station or our dealer.5From The N3UJJ.COM Document Library

2 SPECIFICATIONSTM~241 AIU.S,..\/Canaoa)TM-241A/E l TM-44iA,~~AIC"""~ I ___--:--:T:-cMc---44_1-c-A:-cc--+--:--::T-:-M_-44---,l.....E-:-f---:T ..... M-:-·54_1_A/'-E--IF re

3 ACCESSORIESUnpack your new transceiver carefully, and examine itfor visible damage If the equipment has beendamaged in shipment, notify the transportationcompany immediately. Save the boxes and packingmaterial for future shipping.The following accessories should be included in the boxwith the transceiver.DTMF Microphone(U.S.A. CANADA only) . . . . . . . . . T91-0380-X5 1 ea.orDynamic Microphone(GENERAL market only) . . . . . . .orT91-0379-X5 1 ea.Dynamic Microphone(EUROPE market only) . . . . . . . . T91-0382-X5 1 ea.Microphone Hook(U.S.A. CANADA only) . . . . . . . .Mobile Mounting KitJ20-0319-24 1 ea.Bracket . . . . . . . . . . . . . . . . J29-0436-03 1 ea.Screw set . . . . . . . . . . . . . .Self tapping ScrewN99-0331-05 1 ea.(U.S.A. CANADA only) . . . N46-3010-46 2 ea.Hex wrench . . . . . . . . . •. . . . . . . .Stacking plateWOl-0414-041 ea.(TM-441A/441E/541A/541E).. J21-4147-14 2 ea.DC power Cable . .. .. .. .. .. ..Fuse (TM-241A/241E: 15A)..E30·2111-05 1 ea.FOS-1531-0!5 1 ea.(TM-441A/441E: lOA)..(TM-541A/541E: 8A) . . .FOS-1031-0!5 1 ea.FOS-8021-0!5 1 ea.Instruction Manual . . . . . . . . . . . B62-0031-XX 1 copyWarranty Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ea.(U.S.A., CANADA, EUROPE markets only)4 INSTALLATION INSTRUCTIONS4-1 INSTALLATIONMounting BracketWhen installing the transceiver in a vehiclie consider theease of operation and safety when selecting thelocation for the mounting bracket.1. Install the bracket using the suppliecl flat washersand self tapping screws ( 4 pcs.each).2. Attach the transceiver loosely using the 4 SEMSscrews.3. Align the grooves in the bracket with thetransceiver's screws (Fig. A) and slide the transceiverto the rear.4. Adjust the viewing angle in the bracket to thedesired position ( Fig. B).5. Hold the transceiver in place and tighten the 4 SEMSscrews using the supplied wrench.Fig. A7From The N3UJJ.COM Document Library

4-24-2-1CONNECTIONMobile Installationsutions :1. Before installing the power cable, be sure toremove the negative lead from the battery forsafety.'2. After installation and wiring, be sure to doubleI check for correct installation before reconnecting .the negative lead to the battery terminal. ·3. If the fuse opens, be sure to check that eachconductor has not been damaged by short .circuiting, etc. Then replace with a new fuse ofthe same rating.4. After completing the wiring, wrap the fuse holderwith heat resistant tape to protect against heatand moisture.5. Do not remove the fuse even if the power cable istoo long.A. Battery ConnechonsConnect the power cable directly to the batteryterminals. Using of the cigarette lighter socket will leadto a poor connection, and will result in poorperformance. Pay close attention to the polarity of thecables when connecting them to the battery.Make sure the positive i +I and negative (-)lead polaritywhen connecting to the battery.Engine compartment --JL-- Passenger co. mpartmentR~d Fuse L.:J I• Black\ To the, \ transceiverFuse {'>rs;;;;~··~'tlon _whtne 'iI th& ;x>wer cttbls j$ pro­ CjJ' !acted ftom hflat. tru>JS­~-::,

4-2-2 Fixed StationA regulated DC power supply (13.8 VDC capable ofsupplying at least 11 amperes) is required. PS-33 isrecommended.1. Never connect the AC power cable to the ACoutlet until all other connections have beenmade.2. Before connecting and disconnecting the powerconnector. be sure to turn OFF the POWER ·switches of both the transceiver and the DC 1power supply.•3. Observe polarity of the DC power cable. Thetransceiver operates on 13.8 VDC, negativeground. Battery polarity must be correct. Thepower cable is color coded:Red --" + (Positive polarity)Black ---. - (Negative polarity)4-2-3 AntennaThe type of antenna that is used will greatly affect theperformance of the transceiver. Use a properly adjustedantenna, of good quality, to enable your transceiver toperform at its best. The antenna input impedance is 50ohms. Use 50-ohm coaxial cable such as RG-8U or 80-2Vfor this connection. If the antenna is far from thetransceiver the use of low loss coaxial cable, such as RG-8U is recommended. Match the impedance of thecoaxial cable and that of the antenna so that the SWR isless than 1.5 to 1. The protection circuit in thetransceiver will activate if the SWR is particularly poor(greater than 3 to 1).High SWR values will cause the transmitter output todrop, and may lead to TVI or BCI reports.Caution :We recommend that you install a high qualitylightening arrestor in your antenna lines forprotection against fire,electric shock,personalinjury,or damage to the radio itself.9From The N3UJJ.COM Document Library

5 OPERATION5-1-1 CONTROL FUNCTIONSI~A.LDCK - - REVCD POWER switchPress to turn the transceiver on or off.Press the VFO/M ~ V or M R/M key and switching thepower on will reset the VFO or MEMORY.The microphone PF key can be programmed whenthe power is switched on.·~Tuning controlThis control is used to select the desiredtransmitter I receiver frequency, M Hz step, memorychannel, frequency step, tone frequency, scandirection, etc.@VOL controlThis control is used to adjust the volume from theinternal and external speaker (if used). Clockwiserotation will increase the volume andcounterclockwise rotation will decrease the volume.@ SQL (Squelch) controlThis control is used to select the desired squelchthreshold level.:ID LOW /01 M keyLOWThis function is used to select the !transmit outputpower level (HI, MID(Except TM-54V\/E), or LOW).DIMThis function is used to select the intensity of thefront panel display illumination. (See page 48)Pressing the F key for longer than 1 second and thenpress the LOW/DIM key while the F indicator is flash·ing will turn the time-out timer function on and off.@Microphone connectorAttach the supplied microphone to this connector.The pin out of the connector is shown in theaccompanying illustration.])GND---,:I'· MIC(Microphone Audioi'-.A~~J_', PTT(Push to Talk)(j) GNO {Microphone audial([l RX Audio Output(Approx 100 mV/10 k ohm)10-?) 8 VOC (Max 1 SO mAlFrom The N3UJJ.COM Document Library

CD VFO/M Ill> V keyThis key is used to return to VFO operation afteroperating in the MR or CALL channel mode.Pressing this key will allow the tuning control andmicrophone UP /OWN keys to increase or decreasethe operating frequency.Press and hold the key for longer than 1 second toinitiate VFO scan. Pressing the key after scan hasbeen initiated will cause scan to stop.Pressing the key within 10 seconds of pressing the Fkey will copy the memory channel or caU channeldata to the VFO .. This allows you to changeparameters of that channel without actuallychanging the data that has been stored in memory.Pressing the F t\ey for longer than 1 second and thenpressing the VFO key will cause radio to toggle thehold I resume mode between Time Operated scanand Carrier Operated scan.If you press and hold the VFO key while you turn onthe POWER switch you will reset themicroprocessor's VFO memory, without destroyingthe memory channel or call channel data.@ MR/M keyThis key is used to select MR (Memory Recall) modefrom the VFO mode. The tuning control can then beused to select the desired Memory channel.Pressing the key for longer than 1 second willinitiate memory channel scanning.Pressing tl1e key within 10 seconds of pressing the Fkey will store the displayed data into memory.In the MR channel mode pressing the F key forlonger than 1 second and then pressing the MR keywill cause the Memory channel to skip duringMemory channel scan mode.If you hold and press this key while you turn on thePOWER switch you will clear all the microprocessor'soperator programmed memory section.MHz/LOCK keyThis key is used to tell the microprocessor that youwish to increase or decrease the operatingfrequency in 1 MHz increments.Pressing this key within 10 seconds of pressing the Fkey will cause the key lock function to activate,protecting the currently displayed data fromaccidental erasure.Pressing the F key for longer than 1 s'econd and thenpressing MHz I LOCK key while the F indicator isflashing will turn the AUTOMATIC POWER OFFfunction on or off.(See page 48)11From The N3UJJ.COM Document Library

@CALL keyPress this key to activate the call channel function.Press the F key momentarily and then press theCALL key to store the currently displayed data intothe CALL channel. The radio will allow you up to 10seconds to press the CALL key after pressing the Fkey.Pressing the F key for longer than 1 second and thenpressing the CALL key will store the currentlydisplayed data as the lower limit for theprogrammable VFO tuning limit function.(WSHIFT/AL keySHIFT functionPressing this key alone to select the desiredtransmitter offset direction. Pressing the key willcause the radio to·shift from one offset direction tothe next. i.e. " " to "-" to simplex where noindicator shows. ("-"to"- -" for Europeanversions)AL functionPressing the F key momentarily and then pressingthe SHIFT I AL key will cause the radio to activate thePriority Alert function. When this function is activethe radio will scan memory channel 1 at approxi·mately a 5 second interval. If there is activity on thefrequency a beep will sound from the speaker.Pressing the same key sequence again will cancelthe function.Pressing the F key for longer than 1 second and thenpressing the SHIFT I AL key will store the currentlydisplayed data as the upper limit for the program·mabie VFO tuning limit function.:§) TONE/T.AL T keyTONE functionPressing this key by itself causes the radio to selectthe desired tone signaling mode. When the "T"indicator is illuminated in the display the transceiverwill transmit the selected subaudible tone. Whenthe "CTCSS" indicator is illuminated the transceiverwill both transmit the subaudible tone and will alsoremain squelched until the proper subaudible toneis received.TONE frequency selectionPressing the F key for longer than 1 second and thenpressing the TON E/T.AL T key will allow you to selectthe desired tone frequency. To change to adifferent tone frequency rotate the tuning controlor press the UP /OWN switches on the microphoneuntil the desired tone frequency appears in thedisplay. To return to the normal frequency displayyou can press any front panel key except the powerswitch.TONE ALERT functionIf you press the F key momentarily and then pressthe TONE / T.AL T key, T.AL T function will beactivated. This function wili cause the radio to emita series of beeps when an incoming signal isreceived. (See page 47)12From The N3UJJ.COM Document Library

?; REV /STEP keyThis key is used to reverse the transmit I receivefrequencies during repeater operation. If you haveselected simplex this key will not function!Pressing the F key momentarily and then theREV /STEP key will allow you to select the desiredVFO tuning step and Scan step size. Use the tuningcontrol to select the desired tuning step and thenpress any front panel key except the POWER switchto return to the normal frequency display.Pressing the F key for longer than 1 second and thenpressing the REV/ STEP key will turn the BEEPfunction Off or ON.® DR/DT/AL T key(AL T: TM-541A/541E only)DR/DT function · ..Pressing this key aione to select the DTSS(Dual ToneSquelch System) function or DRS (Digital RecordingSystem ) function.AL T functionPressing the F key momentarily and then theDRIDT I AL T key will cause the AL T(Automatic LockTuning) function of the TM-541AI541 E to activate.Pressing the F key for longer than 1 second and thenpressing the DT I DR I AL T key will turn the DRSfunction ON or OFF.5-1-2 LCD Display PanelCD LOCK~___-,2.}~f-,_.\i:6l \~ @) (j]; @-~ :I!_(. A LOCK _7 J ,1;j··t~~~m .£)(2',...:.:::............•m~• 1 - - - - -- ---1 ~ /-;,""' c:3J-+-~r8~ _B.J 8 8 8 81:': r=·-8-8-~ ·~(~}i', \ APOJ- .'_ ·- -·-.!.-'- _._!::! L*~- -" (g)_>"6

Indicates the active memory channelnumber. * indicates that the chan·nel is locked out.Cis displayed during call channel.Either PO, Pl, P2, P3, or PA is dis·played during paging.I On whenever the F key has been de·Ipressed. Also shows the last memorychannel number that had been se·lected.On when the Tone Alert function isactive. The indicator flashes whensignal has been received.rl.}:CTCSS On when the Tone Decode and En·code function has been activated.c_ ____ On when the Tone Encode functionhas been activated.i5l ALOn when the Priority Alert functionhas been activated.@REVOn when the Reverse function hasbeen activated.+ Display the selected transmitter off·set direction.Both - and + light at the sametime during split channel operation.@ :aaB.BBBs Displays the operating frequency toL_the nearest kHz digit; or the tonefrequency etc.The indicator flashes when scan·ning.Q) ANTENNA connectorAttach an antenna with a low SWR and animpedance of 50 ohms.~ 13.8 VDC power input connectorConnect the supplied DC power cable to thisconnector.Pay close attention to the polarity. Red is positive andblack is negative.@Fuse holderContains a requaired fuse.TM-241A: 15A, TM-441A: lOA, TM-541A: SADo not use a larger fuse as damage might result tothe transceiver.@External speaker jackThis jack is used to connect an external speaker. Thespeaker should have an impedance of 8 ohms.14From The N3UJJ.COM Document Library

5-1-4 Microphone\-.7,~f. ,,,ci:!OU.S.A.European version versionCD®UP/DOWN switchesThese switches can be used to increase or decreasethe VFO frequency, the Memory channel number,and the Tone frequency, etc ..@ PTT (Push to Talk) switchThe transceiver will transmit whenever this switch isdepressed. Scan operations may be canceled by pressingthis switch without transmitting.@CALL key (except European version)This key functions just like the CALL key on the frontof the radio. ·1750 key (European version)The transceiver will transmit with 1750 Hz repeateraccess tone whenever this switch is depressed.@VFO keyThis key functions just like the VFO key on the frontof the radio.@MR keyThis key functions just like the MR key on the front ofthe racio.(}) PF (Programmable Function) keyThis key can be programmed to perform any of thefollowing functions:MHz key (Initial setting from the factory); or SHIFT·key; or TONE key; or REV key;or DR/DT key; or LOWkey.To program the key use the following procedure:1. Turn the POWER switch on the transceiver OFF.2. Press and hold the key on the front panel of theset that corresponds with the function you wish toprogram the microphone key to perform.3. Turn on the POWER switch while the key on thefront panel is held in.4. Release the front panel key.One additional function can be programmed that isnot included on the front panel of the transceiver.This is known as the MONITOR function. This will allowyou to open squelch to check the band for a clearfrequency. This will function even if you are operatingin the CTCSS decode mode or DTSS mode or PAG­ING mode.MONITOR programmingPress and hold the F key on the front panel as youturn on the POWER switch of the transceiver andthen release the F key.@ 16-Tone DTMF keypad (U.S.A. and CANADA versiononly)These buttons are used to activate the DTMF encod·er.@LOCK keyThis key will deactivate all functions of the microphoneexcept the PTT function and DTMF key pad.15From The N3UJJ.COM Document Library

5-2 RECEIVER OPERATIONSAudio confirmation is provided whenever a front panelkey is depressed. You can disable this function bypressing the F key for longer than 1 second and thenpressing the REV/STEP key.5·2·1 Receptoin1. Connect the power supply, antenna, and microphoneand then adjust the controls as follows:Power Switch . . . .. . . . OFFVol Control . . . . . . . . Full CounterclockwisePower switch of power supply(Fixed station) . . . . . . OFFSQL Control . . . . . . . . Full Counterclockwise2. Turn on the Power Supply and then turn on thetransceivers POWER switch. The display shouldindicate a frequency. Fig.l shows examples offrequencies that will appear on the various models.In addition to the frequency you may see one ormore controlrndicators illuminats on the display.TM-441ATM-241 A/241 E 'lU .S.J).:.'I.ersion) TM-541 A/541 E~~a.aaa- . -·--·-·--·-TM441 A/TM-441 EFig. 1,,unnanrc,U.U UNoteThe frequencies shown above are the defaultfrequencies after a microprocessor reset. If thei display shows incomplete data or you think the:displayed frequency is in error you should reset theI Microprocessor. Memory Initialization on page 21.3. Rotate the VOL control clockwise until a signal ornoise is heard coming from the speaker.4. Rotate the tuning control or press the microphoneUP/OWN switches to select an open channel. Thenrotate the SQL control clockwise until the noise justdisappears and the BUSY indicator turns off. Thispoint is known as the Squelch Threshold point. Thesquelch control must be adjusted to this setting forthe Scan functions to operate properly.5. Select the desired operating frequency using themicrophone or tuning control. When a signal isreceived the S-meter will deflect and the BUSYindicator will turn ON.CautionTurn off the transceivers POWER switch before youstart or stop your vehicles engine. or your home. power supply.:.J16From The N3UJJ.COM Document Library

5-2-2 Frequency SelectionYou can change the dial frequency while in the VFOmode. The frequency can then also be stored inmemory, or in the call channel using the techniquesthat will be described in this manual.---- --- --~---VFO rnodeMR key VFO key VFO key CALL key[MEMORY cha_nnel mode •CALL keyMR keye VFO Mode Operation FrE~quency Selection1. Press the VFO/M ~ V key to select the VFO mode.2. Rotate the tuning control or press the microphoneUP /DWN switches to select the desired frequency.e Memory Channel Selection1. Press the MR/M key.2. Rotate the tuning control or press the microphoneUP I DWN switches to select the desired memorychannel.e CALL Channel SelectionPress the CALL key to select the Call channel.5-2-3 Frequency Step SelectionThe frequency step is indicated in the chart below.STEP5~ 1 0~ 15~20~ 12.5~25TM-241A/E (J (J (J (J (J (JTM-441A/E (J (J (J 0 (J (J~---- f-~TM-541A/E X (J X (J (J (JTo select the desired tuning or scan step size use thefollowing procedure:1. Press the VFO/M ~ V key to select the VFO mode.2. Press the F key momentarily. The F indicator shouldlight in the display.3. Press the REV /STEP key within 10 seconds of pressingthe F key. The current frequency step size will bedisplayed.17From The N3UJJ.COM Document Library

4. Rotate the tuning control or press the UP I DWNswitches on the microphone until the des1red tuningstep size appears in the display.5. To complete the programming of the step size youcan press any key on the front panel except thePOWER key, or simply wait 10 seconds and themicroprocessor will automatically return to thenormal frequency display.The chart below shows how the microprocessor willcorrect a new step size.5,10,15,20 to 12.5,25 12.5,25 to 5,10,15,20R.5.10.15 ··~~-.,..oa····--:6,25,30,35 i 25'-----:::io-C:,4:is-':::.so.ss ~- so. 6o,65,7o,75, I. 80,85,90,95 75 .JI,_... 0 ··- 0 ~i 12.5 10f---·-·······I 25 20I 37.5 3050 5062.5'60I 75 . '70I 87.5 I 80__ .. _5-2-4 Programmable VFO Tuning UmitsThe TM-2411 4411541 series radios provide the capabil·ity of programming the VFO tuning range, in 1 MHzband segments, as well a providing a separate program·mabie band scan function(See page 26). For exampleyou could tell the transceiver that you only wish to tunethe 144 MHz and 145 MHz band segments. The tuningcontrols and microphone UPIDWN switches would thenonly tune within these specific frequency limits. Theprocedure for specifying these limits is described below.1. Press the VFOIM..,V key to select the VFO mode.2. Rotate the tuning control or press the microphoneUP I DWN switches until the desired lower tuningrange appears in the frequency display.For example with the TM-241 you might want toselect the 144 MHz band. and dial up 144.100 MHz.3. Press the F key for longer than 1 second. The Findicator should begin flashmg.4. Press the CALL key within 10 seconds. A long beepwill sound and the F indicator will turn off in thedisplay. This indicates that the lower limit has beensuccessfully stored in memory.Press the key for longer than1 second.18From The N3UJJ.COM Document Library

5. Now select the desired upper tuning limit using theMHz key and tuning control, or microphone UP/OWNswitches.With our example TM·241 we want the upper bandlimit to be in the 145 MHz band, and therefore dialup 145.100 MHz.6. Press the F key for longer than 1 second. The Findicator will again begin flashing.7. Press the SHIFT/AL key within 10 seconds. A longbeep will sound and the F indicator will turn off inthe display. Thiis indicates that the upper limit hasbeen stored in memory.5·2·5 AL T (TM-541A/541 E only)The AL T system operates similar to an AFC (AutomaticFrequency Control) system. This system is useful whenthe frequency of either station starts to drift. When thisoccurs distortion of the signal is the usual result. TheAL T system will detect the drift and shift the frequencyto compensate.To activate the AL T function1. Press the F key momentarily. The F indicator will turnon in the display.2. While the F indicator is on press the DR/DT I AL T key.The AL T indicator will turn on and the receiver willautomatically center itself on the incoming signal.8. To confirm that the programming was properlyperformed rotate the tuning control or press theUP /OWN switches. The transceiver should not goabove or below the programmed band limits.9. To clear both pr.ogrammed limits simultaneously youshould initialize the VFO memory usmg theprocedures discussed on page 21. You can reprogrameither limit independently by following theappropriate instructions above.Turns on wh·en the transmit ,frequency of the distant i, station is lower than your ILre~eive fr!l(l!Jency. ...... .Turns on ~hen the transmit Ifrequency of the distant Istation is higher than your [receive frequency.Note:, The frequency display will not actually change, even though the' receive frequency might shift in order to properly tune the ·incoming signal. When the AL T system is operating the Direction •indicator in tho~ display will turn on to signal a change in the ireceiver frequency. The direction indicator will show you if the Iincoming signa I was higher or lower than the displayed frequency.. .. -3. To release the AL T function press the F keymomentarily and then the DR/DT I AL T key.19From The N3UJJ.COM Document Library

5-3 TRANSMITTER OPERATIONCaution1. Ensure that an antenna with a low standing wave !ratio (SWR) is attached to the antenna connector .before attempting to transmit. Failure to provide :proper termination may result in damage to the ifinal amplifier section. ·2 Always check to ensure the frequency is clearbefore transmitting.r--··· ... .. ----·:NoteI The .use of LOW power is recommended whenever \oss1ble, to avoid interfering with other stations. !5-3-1 Transmit Basics1. Select the desired operating frequency using any ofthe methods previously discussed.2. Press the LOW /DIM key to select the desired transmitoutput. . ·~--.. ~ ·Q;B'"Ol_-~ I :'15.5[][] I . I~o "- I - -·-·-·-·-·--- - ______,>~- !..,,._ 4-' AC '"'-' , ...t3. Check the frequency to see if it is occupied beforeyou transmit.4. Press the PTT switch. The ON AIR indicator will light,and the RF meter will deflect to the right.If you have selected the LOW power position, the lowindicator will appear in the display and the RF meterwill only deflect slightly. When HI power has beenselected the RF meter will deflect full scale.5. Speak into the microphone. The recommendeddistance to the microphone is 5 em (2 inches).5-3-2 Time-out Timer (TOT)The TOT can limit the continuous transmission time to30 minutes.1. Press the F key for longer than 1 second, then pressthe LOW/DIM key. The T indicator will light. To cancelthe setting, repeat the operation.Press the key for longer than1 second.2. When the time-out timer reaches the transmissiontime limit, a beep will sound and the transceiver willreturn to the receive mode. To transmit again,release the PTT switch and press it again.20From The N3UJJ.COM Document Library

5-4 MEMORY5-4-1 Microprocessor Memory Back-upThis transceiver contains a lithium battery to retainmemory. Turning off the POWER switch, disconnectingthe power cable, or a power failure will not erase thememory.The battery should last for approximately fiveyears. When the battery discharges, an erroneousdisplay may appear in the display.Lithium battery replacement should be performed byan authorized KENWOOD service facility; either yourauthorized KENWOOD dealer or authorized service center.5-4-2 Initial StateInitial state of the microprocessor from the factory isshown in the chart below.... TM-241A/E I TM-441A/E TM-541A/E-VFO, Memory440.000/144.000channel 1, CALL '! 430.000MHzchannel frequencyMHzVFO step l 5/12.5kHz 25kHzMemory channel lCH1 . lCH I·--·-···! Tone frequency 88.5Hz 88.5Hz! 1240.000 ilMHzl25kHzlCH88.5Hz·-·---5-4-3 Microprocessor Initializatione Memory channel InitializationWhen you want to erase all programed data, or if thedisplay shows erroneous information, you shouldinitialize (reset) the microprocessor using thefollowing procedure.1. Turn the POWER switch off.I '2. Press and hold the MR/M key and turn on the POWERswitch.3. Release the MR/M key.e VFO InitializationAll the settings, except the contents of the memoryand call channels, are initialized.1. Turn the power switch off.2. Press and Hold theVFO/M..,._V key then turnthe power switch on.No transmit/ receive operationoccurs when thisis done.r-·~3. Press the VFO/M ..,._ V key again.A LOCK - - P!EV "' AL CTCGS ~~ [Rr.2'-/ / ';88~~~~·~·~··~···~··~ ~p5-4-4 Memory ChannelThis transceiver provides 20 Memory Channels.(18 Memory Channels when DRU-1 installed)In addition to serving as a normal Memory Channelsome of the Memory Channels serve a dual purpose tospecify other parameters. The functions of thoseMemory Channels are described below .C Memory Channel 1 is used to store the frequency forthe Priority Alert function.C) Memory Channel 7 ~ 10 are used to store odd splitrepeater data.C) Memory Channel 11 is used to store the lower limitfor the Programmable Band Scan function.C) Memory Channel 12 is used to store the upper limitfor the Programmable Band Scan function21From The N3UJJ.COM Document Library

..5-4-5 Memory ContentsEach Memory channel is capable of storing thefollowing information. eYES :Can be stored in memory,NO : Cannot be stored in memory)When the DRS unit is not installed and the DTMF unit isinstalled.~··----~-----~• Freq.(SIMPLEX)f-f freq.(oddYES.iYESIYES·rYESsplit) NO NOI YES I NO..: Tone freq.1YES YES YES YESTone/CTCSS ON/OFF .!-···VFO freq. stepIYES YES . YES YES•.----• Shift, REV ON/OFF ~S ! YE_S_+i ___ N_O_-t YESlDTSS cord, DTSS I YES I NO I NO NOON/OFF~---~•---~--~When the DRS unit is installed and the DTMF unit isnot installedr, ~~~~~-~~-------,---,---~CHl-3 CH4~6. CH7-10 CHl~iFreq.(SIMPLEX) 'fES YES YES YES ;freq.(odd split) NO NO YES NO I~~-~-~-~---1---~--Tone freq. · YES YES I YES YESfl •.Tone/CTCSS ON/OFF j' I' .VFO-fr-eq-.-st-ep--+-~Y~E~S~-r-Y_E~S_, __ Y_E~S-~1 _Y_E~S~Shift, REV ON/OFF YES YES NO YESf--------~~--+----t----~----.DTSS cord, DTSS YES NO NO NO I, ON/OFF ,----'---~--'----~--'---.....J15~4-6 Memory Entryesimplex/Normal shift1. Press the VFO/M~V key tor;;:;~:;===~~:::=:;:select the VFO mode. 1,2. Select the desired operatingfrequency ,offset,tone:'I 55/J []frequency,etc.( For example145. 500 M Hz )....__.:::::;.~..:.....;;;..:....;;..:....;;..:....;;..:.....;;'""3. Press the F key. The F f': 0;;., 0;;.. ~g~:-~: ==~""""""~==;;indicator and a memory -· · · :'I 5.5 [] [] F8 .channel indicator willlight.( For example CH 8)4. Select the desired Memory G~~~==:iii~=~Channel using the Tuningcontrol or microphoneUP/OWN switches.(For example CH 5)1'/5.5 [] [] F 55. Press the MR/M key with in r:;~"'G;;·lOsecondsofselectingthe Q. ;-,r,~:7~"~'~'~. :::::::::::::::..:::•~e~~~ c;e~~ne~ill sound fQ'~1-~1..:J.........~c~:55 ,, i'~.;~'-!.~. ... I.and the F indicator and the ~~~ ~3 "() (~ o8 8 "8Memory Channel numberwill turn OFF, and thetransceiver will return tothe VFO mode.22From The N3UJJ.COM Document Library

e Odd.Split Channels1. Press the V F 0 I M .,. V key to ~~~~::=::::::==iii~:::::~select the VFO mode. 1,2. Select the desired receiv·ing frequency ,tone frequency,etc.(For example145.600M Hz) '----'-~;......;;;;;......;;;;-=-=~4. Select any Memory Chan· G~~~===:i~c~nel from 7 thru 10 using:'15.6[][]the Tuning control or themicrophone UP I OWNswitches.(For example CH 10)5. Press the MR/M key within~~~=,==:::::::~~=~10 seconds of selecting the a·o··g·· I -..co ]'"ory Cbhannel. _ -o· . . . ·- -~~~:_ 6 _~~- ,A Mem 1 ong eep w1 11 soundand the F indicator and the ..__...::::::;;.~8""":.;...·Memory Channel numberwill turn OFF.6. Within 10 seconds of press·ing the MR I M key, youshould select the desired0 0,;;.0.:....;;EJ.:...".. _;; G;;;;;,·:;_8:.;;:·;:;...,""""8transmit frequency using G~~~===:i~c~the Tuning control or mi·...,5nnn• . IUUcrophone UP/OWN switches.(For example145.700MHz)7. Press the MR/M key within ~~~~===:i~c=;;10 seconds of selecting the 1 ' 9 ''O"'Q""· "transmit frequency. A long 0" ; .. [ __ -~~~-~-~~ 1..beep will sound to signal · - .. "" ....the data has been success- ..___ _...::::8 ......_,0.;;;;'""""'"8'-·'..;;;8;;.,'..;;;8;;;.·...;;'8"-mfully stored.1'1o8. To confirm the contents of ~~~~===:i-~c~the Split Memory Channei 1 'Q'"f!!'Q"'·5 c;., npress the MR/M key andre· .ouu :acall the channel. The re· ·- · · ·- · ..... ''CeiV!ng frequency and ~\.. 8 '0 EJ ,9 8 '8- + indicator will appearin the display.1o9. To check the transmit fre-r;~~~==:=i~c==::;q uency press the REV /STEP''CJ"(j"Q""·... · S n n nkey or Microphone PTT " · •uu :a~~~~:~cyTh~i II tr~~~~~~tini~the display.'=' '- e,0--6~;jf i ,e'23From The N3UJJ.COM Document Library

e CALL Channel1. Press the VFO/M.., V key toselect the VFO mode.2. Select the desired operat- ~;;;~~=:=::::::::::=i~c~ing frequency ,offset,tone~~s.saafrequency,etc.( For exam·pie 145.500MHz ).5-4-8 Memory ShiftThis feature copies Memory Channel or Call channeldata to the VFO.This will allow you to recall and alter these frequencieswithout changing the actual contents of the memory orCALL channel.1. Press the MR/M key or CALL key to select the MRmode or CALL channel mode.2. Press the F key. The F indicator will light.3. Press the VFO/M..,. V key within 10 seconds of pressingthe F key. The F indicator and the Memory or CALLChannel indicator will turn OFF to signal the datahas been successfully transferred to the VFO.EH3 8o8the Memory Channel numberwill turn OFF,to con-'--_;;:;;;.,...;;~_..;....,;;;;;;....;:-;..=.~firm data entry.5·4-7 Memory Channel Recall1. Press the MR/M key.2. Rotate the tuning control or press the microphoneUP I DWN switches to select the desired memorychannel.NOTEIf an Odd Split Memory channel is selected, onlyreceive data will be copied.24From The N3UJJ.COM Document Library

5-5 SCANWhen the scan function is turned on, turn the tone alertfunction off. If the tone alert function is on, scan willnot activate.5-5-1 Scan OperationThe following scan options are available:1. Band scanScan proceeds over the entire band( This function operatesin the VFO mode only.).2. Programmable band scanThe scan frequency range is determined by the frequenciesstored in Memory Channels 11 and 12 (Thisfunction operates in the VFO mode only.).3. Memory channel scanScan proceeds thfu those memory channels thatactually have data entered and have not been lockedout (This function operates in the Memory Channelmode only.).5-5-2 Hold/Resume ProgrammingThe transceiver will stop on a busy channel.Two type of scan hold I resume have been provided inthis transceiver.eTime operated scanScan will resume approximately 5 seconds after stopeven if the station is still present.ecarrier operated scanScan will hold as long as the signal is present, and will. resume S?~_n 2 se~()':cl_s after the signal c!T()P out.:;;;!Note• When ?TCSS is on, scanning stops only at the stations:for wh1ch the CTCSS s1gnal matches. When DTSS is[on, the scanning stops and audio signals are receivedj only when the DTSS code matches.This transceiver is delivered from the factory in the Timeoperated scan mode. To switch between the two modesuse the following procedure.1. Press the F key for longer than 1 second. The Findicator will flash.2. Within 10 seconds of pressing the F key press theVFOIM II> V key. This will toggle the Scan I Resumemode to Carrier operated mode.3. To return to Time operated mode repeat steps 1 and2.25From The N3UJJ.COM Document Library

5-5-3 Band Scan1. Press the VFO/M Ill> V key to select the VFO mode.2. Adjust the SQL control to the threshold point.3. Press and hold the VFO i Mlii>V key for longer than 1second.The MHz indicator will flash as a visual reminder thetransceiver is scanning.r-Press and hold the VFO I MIll> V key for longer1than 1 second.Flashing4. Scan will begin in an upward direction.You canreverse the direction by rotating the Tuning controlcounterclockwise, or by pressing the microphoneDWN switch. The scan step size depends upon thecurrent step programming.5. Scan will stop whenever a signal is received (thatactivates the BUSY indicator) for a limited time.6. Press the PTT switch or any front panel key to stopscan.5-5-4 Programmable Band Scan1. The lower scan limit must be stored in memory channel11 . The higher scan limit must be stored in mem·ory ch.:mnel 12. -~··· . . .~~~~e: frequency in Memory Channel 11 is equal to~~r ::. greater than the frequency stored in Memory c~,annel112 scan will proceed over the ent1re band Band; Scan".12. Adfu._s_t_t-he~SQL control to tile threshold point. ...3. Press the VFO/ Mill> V key to select the VFO mode.4. Select a VFO frequency between the twoprogrammed scan limits.5. Press and hold the VFO I MIll> V key for longer than 1second. The MHz indicator will flash as a visualreminder the transceiver is scanning.Press and hold the VFO / MIll> V key for longerthan 1 second.Flasning6. Scan will begin in an upward direction.You canreverse the direction by rotating the Tuning controlcounterclockwise, or by pressing the microphoneDWN switch.7. Scan will stop whenever a signal is received (thatactivates the BUSY indicator) for a limited time.8. Press the PTT switch or any front panel key to stopscanning.26From The N3UJJ.COM Document Library

5-5-5 Memory Channel Scan1. Adjust the SQL control to the threshold point.2. Press and hold the MR/M key for longer than 1 second.The MHz indicator will flash as a visual reminderthe transceiver is scanning.Press and hold the MR/M key for longer than 1second.Notes1. The transceiver will not scan it there is only one memory channeL2. The transceiver will skip any locked-out channels.3. The transceiver will scan only the memory channels in whichfrequencies have been stored.3. Scan will begin at. the current memory channel andproceed sequentially .i.e.M 1 __. M2 __. M3 etc. Onlythose memory channels with data entered arescanned.4. Scan will stop whenever a signal is received ( that activatesthe BUSY indicator) for a limited time.5. Press the PTT switch or any front panel key to stopscanning.5-5-6 Memory Channel LockoutThe Memory Channel Lockout function allows you totemporarily skip unwanted Memory Channels duringMemory Channel scan.1. Press the MR/M key to select the Memory Channelmode.2. Select the Memory Channel that you wish to skip byusing the Tuning control or the microphone UP/DWNswitches.3. Press the F key for longer than 1 second. The F indicatorwill flash. Within 10 seconds of pressing the F keypress the MR/M key. A star C*) will appear to the leftof the Memory Channel number . This indicates theMemory Channel will be skipped during the MemoryChannel scan operation.,Press the key for longer than1 second.4. Repeat steps 2 and 3 to lock out any other MemoryChannel that you want to skip5. To cancel the lockout , select the desired MemoryChannels as described in step 1 ,2,and 3 above.The star (*) will go out. The Memory Channel willnow be scanned normally.27From The N3UJJ.COM Document Library

, ,5-5-7 Priority Alert FunctionThe priority alert function allows you to monitor memorychannel 1 for activity even when you are tuned to adifferent channel number. When the Priority Alertfunction has been activated the microprocessor willswitch the transceiver to the frequency stored in memorychannel 1 once every 5 seconds. The transceiver willdetermine if a signal is present. If no signal is presentthe transceiver will return to the original frequency. If asignal is present, a beep will sound from the speaker tosignal the channel is busy. This whole process takes justa fraction of a second, so you will not see the displayfrequency change. The only thing you will notice is amomentary pause in the signal on the currently dis·played frequency. To activate the priority alert function:1. Ensure the frequency you wish to monitor has beenentered into memory channel 1.2. Adjust the SQL control to the threshold point.3. Press the F key momentarily,and thenpress r:;;;;~;.=,=:=:::::i!~c=;:;the SHIFT I AL key. The gQ"'Q'"r-:-·· nn ----l"~L indicator will turn on 00 ~'15.5uu1n the d1splay to rem1nd . :-. -·-:-·-:::;-·- "" "you that this function EHD EH3 8•8has been activated. · •4. If a signal is present a beep will be heard from thespeaker.5. To turn this function off repeat step 3. The AL indi·tor will off.. Note:During the period memory channel 1 is being scanned you will not -hear voice communications, only the beep will be heard if apresent.5-6 REPEATER OPERATIONS5-6-1 Transmitter OffsetsAll radio repeaters utilize a separate receive and trans·mit frequency. The receiver frequency may be eitherabove or below that of the transmit frequency. Theconfiguration of most repeaters will fall into one of thecategories listed below:I ITM-241A/I TM-441A I TM441E TM541A l TM-54tE': • 241E • European . : :' !' , :1', versioni ;1~+600kHz-~1~+~5~M~H~z~-~~~l~_~6 7 M~H 7 z--+~12~M~H 7 z-r+~3~5~M~H~z~.E-::~-600 k~z,_ -5 MHz : =~:~=::-~~~~ -6 MHZ!Offset DirectionTo select the desired transmitter offset direction pressthe SHIFT I AL key. Each time you press the key thetransceiver will advance from one direction to the next.i.e. " " to "-" ("-" to " -" with TM-441Eand TM-541A) to no offset (simplex).Automatic Offset Selection (TM-241AU.S.A. version)The TM-241A has been programmed according to thestandard ARRL (Amateur Radio Relay League) BandPlan with regard to transmitter offset direction. Pleasesee the accompanying chart for addition informationon this programming. You can, of course, override thisby using the SHIFT I AL key if desired.145.1 145.5 146.0 146.4 146.6 147.0 147.4 147.6 148.0~_S ___ [ -mrs j_+m[ S I -m: +[~m· - ~m~--JS: simplex28From The N3UJJ.COM Document Library

5-6-2 Reverse FunctionSome repeaters utilize a "Reverse Pair", i.e. the transmitI receive frequencies are exactly the reverse of anotherrepeater. For example repeater A uses 146.000 for atransmit frequency (INPUT) and 146.600 for a receiverfrequency (OUTPUT). Repeater B might use 146.600 fora transmit frequency and 146.000 for a receiver frequency.It would be inconvenient to have to reprogramthe transceiver each time you wanted to use these repeaters.The REV /STEP key allows you to easily reverse the transmitand receive frequencies. To use the REV functionpress the REV /STEP key. The REV indicator will turn on inthe display to remind you that you are working a reversepair.To return to normal press the REV /STEP key again. TheREV indicator will turn off.This function is also useful to check the input frequencyof the repeater so that you can determine if you arewithin range for simplex communications.5-6-3 Tone OperationSome repeaters require the use of a control signal to activatethe repeater. Several different methods are currentlyin use.In the United States sub-audible tones are sometimesused. 38 different Sub-audible frequencies are possible.In Europe a 1750Hz tone is used in transmit. Press andhold the Microphone 1750 key to transmit with the accesstone; you need not press the PTT key.Since this tone is required in Europe and the UnitedKingdom a 1750 Hz tone encoder is included withmodels delivered to these countries.5-6·4 Tone Frequency Selection1. Press the F key for longer than 1 second. The F indicatorwill begin to flash. Press the TONE/T.ALT keywithin 10 seconds of pressing the F key. The currenttone frequency will show in the display.2. Rotate the tuningcontrol or press themicrophone UP I DWNswitches to select thedesiredtonefrequency.3. Press any front panelkey to return to thenormal frequencydisplay.Press the key for longer than1 second.Tone Frequency( Hz)i 67.0 107.2 . 167.971.9 110.9'~; i 73.8. 77.0 118.8 • 186.279.7 i 123.0 i 192.882.5 127.3 203.5 I85.4 Ll.OC371.78-t· ..-,2,-;1--;;;0-..7_-j88.5 136.5 218.1~?:1 14f.3 225.7.i 94.8 ~1""4"6". 2..-+--: "2-;:;-33;::-.-;::-61 ( 9 7.4! I 1,-;5;:-;1:-:.4:;-.,---;.2:;;:4-;;;1--;..8;­,_-;;-1-;:::00"".;:-o -t---:1:-;:5,_6. ?!··· 250.3 ,103.5 162.2 - .~-.. ·~"~-Note: 97.4 Hz is availableonly for encode.29From The N3UJJ.COM Document Library

5-6-5 Autopatch Operations (U-S.A. versionsonly)Some repeaters offer a service known as autopatch. Thisfeature allows you to dial a telephone number fromyour transceiver and carry out a telephone conversion,much like a car telephone, or cellular telephone. Thisfunction requires the use of a DTMF (Dual Tone MultiFrequency) pad. The MC-44DM microphone providesthe normal keys you would have on your telephone athome. as well as 4 additional keys. the A,B,C, and Dkeys. These keys are used for control operator of therepeaterto see if they offer autopatch services.To activate the keypad:1. Press and hold the PTT key.2. Press the keys just like you would dial your telephoneat home.3. The transceiver will remain keyed for approximately2 seconds after you press each number, so you can re·lease the PTT switch without unkeying the transceiver.I Note: - .. J5-7 TONE /CTCSS OPERATIONWith the use of the optional Sub-Audible tone decoderunit (TSU-6) you will be able to operate in a Tone OperatedSquelch Mode. When this option is installed andthe CTCSS function has been activated the radio will notopen squelch until the proper PL tone is received.Press the TDNE/T.AL T key and select the desired Tonennode. When the T indicator appears in the display thetransmitter will transmit the desired tone. When theCTCSS indicator appears in the display the transceiverwill transmit the desired tone and will also operate inthe Tone Squelch mode. i.e. squelch will not open untilthe same tone is received as a portion of the incomingreceive signal. When no indicator is on the radio willnot make use of either tone feature.No indicator T CTCSSI Some repeaters will require the use of a special key 1·sequence to activate the Autopatch function. You •I • should check with your control operator for this 11 sequence.--~---------.,------·· --------------,iNo~: I1 lEven if the TSU-6 is not installed, tone signals can be1• transmitted, so the tone squelch of the other trans- Ii ceiver can be opened. IL _______ _30From The N3UJJ.COM Document Library

5-8 DTSS (Dual Tone Squelch System)OPERATION [Requires optional DTU-2]This function allows squelch to be turned on in thereceive mode on reception of a three-digit codematching the DTSS code selected in your radio.Once squelch is turned on by reception of a matchingcode, it operates normally from then on. If no signal isreceived for longer than 2 seconds, squelch is turned offuntil a matching code is again received.CTCSS signal cannot pass through the repeater, butDTSS signal can pass through the repeater.NOTE• This function is not available in some areas.• The DTSS (or PAGIMG) cord may not be accepted if theI repeater is "identifying". If this should occur you should press! the PTI switch again, and retransmit the DTSS (or PAGING)i cord.. There are two recommended methords of compensating for• this situation.! 1. Press the PTI switch for a lew seconds, send the DTSS (ori PAGNG) cord, release the PTI switch, then press the PTTswitch again and resend the appropriate cord.i 2. Proper DTSS (or PAGING) operation will occur if you ensure· the battery saver circuit is disabled whenever you intend toi operate using eithr the DTSS or PAGING modes.5-8·1 Selecting and Storing the DTSS codeDTSS codes from 000 through 999 can be selected fromthe VFO mode and stored in memory channelsMemory channels 1 through 3 can each store a separateDTSS code.Memory channels 4 to 20 and the call channel cannotstore DTSS codes, but a DTSS code can be set eachmode.5-8-2 DTSS Code SelectionWhen DTMF unit DTU-2 [option] is installed, the initialsetting is 000.DTSSrnnn.I..UUUe Selecting and Storing the DTSS code withthe VFOL Press the DR/DT key to light the DTSS indicator.2. Press the F key, then press the DR/DT key while the Findicator is on (10 seconds). The first digit of the DTSScode will flash.3. Select the first digit by rotating the Tuning control.4. Press the DR/DT key. The first digit is registered andthe second digit begins to flash.5. Select the second digit by rotating the Tuningcontrol.6. Press the DR/DT key. The second digit is registered31From The N3UJJ.COM Document Library

and the third digit begins to flash.7. Select the third digit by rotating the Tuning control.8. Press the DR/DT key and the complete DTSS code isregistered. The mode returns to the previous one.e Selecting and storing a code with the DTMFKEY PAD (MC-44DM)1. Press the DR/DT key to light the DTSS indicator.2. Press the F key, then press the DR/DT key while the Findicator is on (10 seconds). The DTSS code settingmode will be entered and the first digit of the codewill flash.3. Then enter a three-digit number on the key pad.........,Cf'Q"' g·· , • ,""" "''""- r_n_n n-_,_,~:'!~'-:_0.~·~-·~ .. ' "'' ..../--..fiii~:L~~~O.·a~~~ aNotes1. If a key other than the DR I DT key on the frontpannel is pressed during operation, code selectionmode is canceled.2. If no action is taken for longer than 10 seconds,code selection mode is automatically canceled.325-8-3 Selection using memory channels 1through 3• Storing VFO frequencies and DTSS codes atthe same timeL Select the desired frequency to be stored in memoryin the VFO mode.2. Follow steps 1 through 8 above in the VFO mode.3. Press the F key4. Select the desired memory channel (1, 2, or 3) withthe tuning control or the UP/DWN key on the microphone.5. Press the MR/M key[, I !.I 55 • (J nn f,J F 3- - -·-·-·-·-·--~ e Rewriting DTSS codes in memory channels(1 to 3)1. Press the F key while the memory channel is operat·ing, then press the DR/DT key while the F indicator ison. The DTSS code setting mode will be entered andthe first digit of the code will flash.2. Store the selected code in memory.Follow steps 1 through 8 in VFO mode to edit astored code.From The N3UJJ.COM Document Library

5-8-4 Using the DTSS function1. Adjust the SQL control to the threshold point2. Press the DR/DT key. The DTSS indicator will light.Each time the DR/DT key is pressed, the DTSS andpaging functions will be selected:!orss : OFF I orss : oN :Or~s : oFF !,-I PAGING:OFF'- PAGING :OFF f--1 PAGING :ON~DTSS indicator P indicator J. 1L "•"''· ''•"''· deRECEPTION3. Squelch will open when the proper code is received.e TRANSMISSION4. When the PTT switch is pressed, the code shown inthe figure is sent out for about 0.5 second.5-8-5 Using DTSS with a repeaterThe DTSS signal is transmitted after a short delay if thePTT switch is pressed while the - or + indicator is lit.This is to avoid any malfunction due to the DTSS signalbeing interrupted by repeaters with long responsetimese Delay during DTSS outputA delay is built in when the DTSS is sent outThe delay time for normal transmission is 250 ms (notmodifable). ·The initial setting for shift, split channel, and duplexis 450 ms, and can be changed to 750, 850, or 1000ms.e Changing the delay time1. Turn DTSS mode on.2. To change delay time press the F key for longer than1 second and press the CALL key while the F indicatoris flashing.( within the 10 seconds.)PT1 ON'PTT OFF'~ I~ Code :Approx.0 S s:ecc:;dsl·NoteI Voice outputi~ muted during code output.5. To cancel the DTSS function press the DR/DT keytwice time.3. Display the desired delay time with the tuningcontrol or the UP /OWN key on the microphone.The displayed delay time takes effect immediately. Ifany other key is pressed or if, after 10 seconds, no keyhas been pressed, the delay time setting mode is terminated.33From The N3UJJ.COM Document Library

5-9 DRS (Digital Recording System)OPERATIONThe optional DRU-1 (Digital Recording Unit) permitsyou to manually or automatically record up to a maximumof 8 different voice messages for later playback.The automatic recording function works in conjunctionwith the T.AL T function.This function can be used with the DTSS or pagingmode.Press the F key for longer than 1 second, then press theDR/DT key while the F indicator is flashing. This operationwill change the modes as follows:Normal Mode• i-- DRS selection ~ DTMF controlmodemodee Normal ModeNo DRS functions active.e DRS selection modeRecording and playbackSelectable tone quality level and or number ofphrasesDRS indicator lights in the displaye DTMF control mode1. Automatic RecordingThe DRS indicator will flash.2. The DRS function can be remotely controlled by anexternal DTMF signal. The DRS indicator goes oncontinuously.5-9-1 Before RecordingThe recording conditions are preset at the factory forthe following settings:Tone Quality Level 1Maximum recording phrase 8Current Recording Phrase number 1 st.0: Recording and playback OK. 1 :Recording LOCK.2: Recording and playback LOCK.DRS888'-' -· '-' -· D l'-' '-' t: MAX. Number PhraseI of phrases , numberi Tone qualitylevel34From The N3UJJ.COM Document Library

5-9-2 Tone Quality Level Selection1. DRS indicator lights in the display.2. Press the TONE/T.ALT key. Each time you press theTONE/T.AL T key the tone quality indicator will ad·vance, i.e. from 1 to 2 to 3 and the back to 1, etc.Tone quality 1 will provide the best audio quality,but the shortest recording time. Tone quality settings2 and 3 provide longer recording times but withan associated decrease in tone quality.Tone quality indicator5-9-3 Selecting the maximum number ofPhrases1. Press the F key for longer than 1 second, then pressthe DR/DT key while the F indicator is flashing.DRS indicator lights in the display2. Press the SHIFT /AL key. Each time you press the keythe maximum phrase indicator will step one position,i.e. from 8 to 4 to 2 to 1 and then back to 8.rno aaDB I IMAX. number of phrasese Relationship between the maximum numberof phrases, sound quality level, and recording(playback) timeIf the maximum number of phrases is set to 8 and thesound quality level is set to 1 (standard), the recordingtime for one phrase will be 4 seconds. Since thephrase number goes from 1 to 8, eight different recordingsare possible. To increase the recording time,set the maximum number of phrases to 1 and thesound quality level to 3. The recording time will become96 seconds. In this case, only one phrase can berecorded, so the currently recorded phrase will beerased when a new one is recorded. Set the maximumnumber of phrases and the sound quality levelas required. The recording (playback) time for eachphrase cannot be set.I Number of Sound quality I~r- . ' ~; maximum phrase ! 12 13 ,~- s ___ I 4 ! -~~~~ll' 4 T;T ~ 242 16 32 ' 48 J1 32' ---- -L64(second/phrase)'I-~35From The N3UJJ.COM Document Library

5·9·4 Recordinge Recording an incoming receive signal manually.1. Select the desired operating frequency. Recordingscan be made from the VFO mode, the Memory Modeor the Call Channel mode.2. Press the F key for longer than a second, then pressthe DRIDT key while the F indicator is flashing to en·ter the DRS setting mode.The DRS indicator should turn on in the display.·Select the desired phrase number by rotating thetuning control.3. Press the VFO I M ..._ V key to begin recording. Therecording time indicator will show the elapsed timeof the recording.·n··g"r-+t1v-·~ ·-rknB I:-Elapsed t1mee Recording Signals from the Microphone1. Press the F key for longer than 1 second, then pressthe DR I DT key while the F indicator is flashing toenter the DRS setting mode. The DRS indicatorshould turn on in the display. Select the desiredphrase number by rotating the tuning control.2. Press the MR I M key to start recording from themicrophone. The recording time indicator willindicate the elapsed time of the recording. If youwish to transmit the same message while recordingyou should pre,ss the microphone PTT switch beforeyou press the MRIM key.Elapsed time (U.S.A. )version .4. Recording will stop when the time indicator reaches"00". To continue recording from the samefrequency rotate the tuning control to the nextphrase number and then press the VFO I M ..._ V keyagain to begin recording. Recording will stop whenany front panel key is pressed.3. The recording will stop when the elapsed timeindicator reaches "00". If you wish to continuerecording you will need to rotate the tuning controlto the next phrase number and press the MRIM keyagain.Recording will stop when any front panel key ispressed.36From The N3UJJ.COM Document Library

5-9-5 Play Back1. Press the F key for longer than 1 second, then pressthe DR I DT key while the F indicator is flashing toenter the DRS setting mode.The DRS indicator should turn on in the display.Select the phrase number of the phrase you wish toreplay.2. Press the CALL key to play back the message. If youwish transmit the message at the same time youshould press the PTT key before pressing the CALLkey. The elapsed time indicator will begin countingthe elapsed time.-, Elapsed timeQ"Q"Q'"• i ns I I: """' CfJu 1 t5-9-6 Automatic Recording1. Select the desired operating frequency. Adjust theSQL control to the threshold point. Automaticrecording is possible in the VFO mode, MemoryChannel mode, or Call Channel mode.2. Press the F key for longer than 1 second, then pressthe DR I DT key while the F indicator is flashing toenter the DRS setting mode.Select the desired tone qu(llity, the number ofrecording phrases, and the beginning phrasenumber.3. Press the F key for longer than 1 second, then pressthe DRIDT key while the F indicator is flashing to en·ter the DTMF control mode. The DRS indicator willflash.4. Press the TONEIT.AL T key. The T.AL T indicator willlight and the recording wait mode (automatic re·cording mode) will be entered.3. Playback will stop when the time indicator displays"00". You can manually stop the play back bypressing any front panel key.37From The N3UJJ.COM Document Library

5. Only a signal with the proper CTCSS tone (if the TSU-6 is installed ) will initiate recording. If no tone unit isinstalled the recording will start whenever squelchopens. (The alert function will not sound an alarm.)The CTCSS, DTSS (only reception is possible even ifthe DTMF unit is not installed), and paging functionsare available.6. If the squelch is closed during recording in theautomatic recording mode, recording will finish atthe current phrase, and the next phrase will beawaited even if there is recording time remaining.(Recording will not be possible if there is no emptyphrase.5-9-7 External Control of the DRS Function(DTMF control mode)The DRS function can be remotely controlled by anexternal DTMF signal.5-9-8 I D Number SetingSelect a four-digit number from 0000 to 9999.1. Press the F key for longer than 1 second, then pressthe DR/DT key while the F indicator is flashing. TheDRS setting mode will be entered and the DRSindicator will light.OLock cancelingIf the third digit of the display is "1", recording islocked, and a new signal cannot be recorded in thesame phrase. If the third digit is "2", recording andplayback are locked, and a new signal cannot berecorded in the phrase and the phrase cannot be playedback.To cancel the lock, press the REV/STEP key so that thethird digit become zero(O).Press the key for longer than 1 second.2. Press the MHz I LOCK key. Four digits will bedisplayed, and the first digit will flash.3. Set the first digit with the tuning control, then pressthe M Hz/LOCK key.The second digit will flash.38From The N3UJJ.COM Document Library

4. Set the second digit with the tuning control, thenpress the MHz/LOCK key.The third digit will flash.5. Set the third and fourth digits. When the fourth digithas been set, the DRS setting mode will beautomatically reentered.The digits can be set with the MC-44DM (option).Perform steps 1 and 2, and key in the number withthe numeric keys.Each time a key is pressed, a digit is set. When all thedigits have been set, the frequency will be displayedagain.5-9-9 Setting the DTMF Control Mode1. Select the receive frequency.2. Enter the DRS setting mode, and specify the numberof phrases, sound level, and I D number. (See Sections5-9-1/2, 5-9-5, and 5-9-8.)3. While in this state, press the F key for longer than 1second, then press the DR/DT key while the F indicatoris flashing. The frequency will be displayed againand the DRS indicator will flash.4. Press the F key. The DHS indicator will stop flashingand stay on. The transceiver will be ready to be controlledremotely.The automatic recording mode will be ignored, as willthe DTSS and paging modes.5-9-10 External Control MethodFor external control, recognition code # or • willtransmit a four-digit ID number and three-digitcommand code.# 1 2 3 4 *0 1Leading zeroes in the ID number can be omitted.eust of DTMF commandsSee next pageNote:To transmit a DTMF signal, press a key within fiveseconds of pressing the preceding key. If there is atime delay of longer than five seconds, the DTMFsignals that have been tr;ansmitted will be cleared.Press the key for longer than1 second.39From The N3UJJ.COM Document Library

00RO"et oo;m,nd •nd Re"'t oo~L_L:top recording_ stop recording II 01 • Record with the f1rst I ~II phrase J02 , Record with the 'second phrase03 Record with the thirdphrase04 Record with the 4thphrase05 Record with the 5thphrase···-- -----------------.... -____06 Record with the 6th i-:phraseI 07 Record with the 7th -phrase i08 Record ·with the 8th-phrase1 Record with each09 J phrase for which recordingis not locked--------II'r 10 I Unlock recording of I'· all phrases~-~ Unlock ~r~e~c~or~d~ing of i Set 1 for! the first phrase • qualityr.' 161213Unlock recording of • Set 2 for1the second phrase JI the third phrasequality1 Unlock recording of I Set. 3 -for1the tone i···~the tone 1thequalit_Y _____ _,14 1 Unlock recording of · tone I15J the 4th phrase ['Unlook "'o'ding of I Set 1 fo' the ""mb"the 5th phrase of phrasesI. Unlock recording of ! s._e_t_2_f_o_r_t_h_e_n_u_m_b_e--jr~--~--+I1~'1718t_h_e 6th phrase : of phrases• Unlock recording of Set 4 for the numberi the 7th phrase of phrases, Unlock recording of Set 8 for the numberthe 8th phrase of phrasesI 19 I Automatic recording Automatic recording~de on mode offI40From The N3UJJ.COM Document Library

5-10 PAGINGThe paging function is available when the optionalDTMIF unit (DTU-2) is installed.The paging function is useful to call all stasions a group,a sp13cific station, or wait for a call from another stationby using DTMF(Duai Tone Multi Frequency signaling.Example: When station 2 is calledF: 145.66DMHz~~~MHz333 Ill, L

5-10-1 Paging Code MemoriesThere are five(5) paging code memories.;·····'PAPOP1"'-'P3.... ·-·-~Use1 Sto~= your individual ID code in memory ..Automatically stores the calling station's 'code during reception. Can temporarilyset code for the station.I Stores group codes and local station .codes m memory.5-10-2 Setting the Paging Codes1. Press the DR/DT key to enter the paging mode. The Pindicator will light.2. Press the F key, then press the DR/DT key while the Findicator is on. The code setting mode will beentered and the memory channel indicator will flash.p- - -·-.,.,.o"......... ~.· tr

For example, the following groups communicatewith each other.Predetermined frequency 145.660MHzYour individual code 111Station l's individual code 222Station 2's individual code 333Station 3's individual codeGroup code4447895-10-3 Paging Transmission(Calling)Your individual ID code is preset in memory A. (YourindividuaiiD code is always stored in memory A.)1. Tune to the predetermined frequency.2. Press the DR/DT key to light the P indicator.~~==~~~~~-pindicatesthepagingYour memoryPA 111POPl• P2 444P3 7891Station 1 memoryPA 222POP2 7893. Press the F key, then press the DR/DT key while the Findicator is flashing.ation 2 memory_j!I.P~ 333:; P3 789L:: .Station 3 memoryPA 444POPl 789I P2 1114. Select the memory number in which the local stationcode is stored using the tuning control.Turn the paging function of the othertransceiver on.43From The N3UJJ.COM Document Library

Calling all station in the group1. To call all station in the group, select the memorynumber in which the group code is stored. In thisexample. the number is stored in number P3.2. Press the PTT key once or press a key other thanDR/DT or MR/M to display the frequency again.3. Press the PTT switch.145.660MHz789* 111--·········-·---------Calling a specific station(Example: Call station 3.)To call a specific station (for example, station 0. 3), usethe following procedure:1. Select the memory in which the local station code isstored (in this example, select memory P2.) or Enterthe individual code of the local station in memory 0.2. Press the PTT key once or press a key other thanDR/DT or MR/M to display the frequency again.3. Press the PTT switch.1I145.660MHz444*111Group code 789 and your station ID code 111 aretransmitted. A DTMF tone sounds is heard duringtransmitting.Local station code 444 and your station I D code Ill aretransmitted. A DTMF tone sounds is heard duringtransmitting.44From The N3UJJ.COM Document Library

5-10-4 Paging Reception (Stand by)1. Tune to the predetermined frequency.2. Press the DR/DT key to light the P indicator.5. The individual code of the calling station is stored inmemory 0.Press the PTT switch to respond to the calling station.145.660MHz444*111iStand by with individual code (Example: Stand by forstation 3.)3 When called with your station ID code, the memorynumber automatically change to 0. The ID code ofthe member 3 is displayed.local statio,n code,.---1~ .. ~p' '-/ '-1 '-1~-is displayed to indicate thatlt!our station is being called. __jWhen the transmission ends, the frequency will be dis·played again.After the local station has been contacted, cancelpaging mode. Communication can be performed moreefficiently.If the local station code can not be decorded, "Err"appears on the display.S&AI'Err PG-1-3-5-?-S-OVEA-4. The squelch is opened.45From The N3UJJ.COM Document Library

Stand by with groupL When a call is received with the group code, thesquelches of all the members of the group areopened to enable reception.When you are called with the group code, thecommon group code and its memory channelnumber are displayed.(Example: Group code 789 is stored in channel 3.)Group code Flashing5-l 0-5 Code Lockout(A code is locked out only during reception with thE~paging function.)If an individual code is stored in P l,P2 or P3, reception is'enabled when the codes match, even if one localstation communicates with another. To use memoriesPl to P3 for transmission only, lock out the memories.When you are communicating with two or more groupshaving the same frequency, lock out the group codewith which stand by is temporarily stopped.,. Paging memory lockoutSSRF -1···--3-.,_,-- i~---··>-1-[JVfR-13 is displayed t~ indicatethat the I. station is being called.·-..... ---------------1. Enter the code setting mode and display the number(except memory 0 and A) to be locked out using thetuning control.2. Press the MR/M key .*mark lights and the memory is locked out.2. When the PTT switch is pressed, group code 789 (asdisplayed) and your station ID code are transmitted.You< can participate in the group-roundtable.3. After the remote station has been called, cancelpaging mode.Communication can be performed more efficiently.3. To cancel, repeat steps 1 and 2.46From The N3UJJ.COM Document Library

5-11 TONE ALERT SYSTEMThe Tone Alert function will provide an audible"Alarm" to signal when someone is transmitting on thefrequenc~you are monitoring:_ ___ ·---·· ~Note1 When using the CTCSS function the incoming signalmust be present for approximately 2 secondsin order for the Tone Alert function properly.2. When the DTSS function is on, the bell functionworks only when the DTSS code matches. .3 When the paging function is on, the bell functtonworks on; when the code matches.1. Adjust the SQL control to the threshold point.2. If you will be using the CTCSS functiOn you shouldselect the proper tone frequency and ensure thecress indicator is on.If you will be using the DTSS function you shouldselect the proper DTSS codes and ensure the DTSSindicator is on.If you will be using the PAGING function you shouldselect the proper PAGING codes ana ensure the Pindicator is on.3. Press the F key and then the TONE/T.AL T key. TheT.AL T indicator will light.4. When a signal is received and the squelch is open, analarm sounds for about five seconds, the T.AL Tindicator flashes, and the elapsed time count begins.5. The elapsed time is displayed in minutes to up to 59hours 59 minutes. If a new signal is received duringcounting, the elapsed time is cleared, and theelapsed time from the new signal being received IScounted. Flashing_jx551.59 /1- .. -·-·-· . ·"""'-6. If a key is pressed wh1le the elapsed time is beingdisplayed, the T.AL T function is released.7. To release the T.AL T function when no signal is beingreceived, press the TONE/T.AL T key again _ .fl\fo-tes l· 1 When the PF key on the microphone is set as themonitor key, the voice can be monitored by press- ·ing the PF key while the T.AL T function is working: 12. The T.AL T function may fail if the received s1gnalts 1 !abandoned (audio low-frequency distort1on, 1gn1-tion noise, etc.). In this case, the Interference can .be reduced by installing an optional TSU-6 andsetting the CTCSS frequency to 141.3 Hz or lower.When a repeater is used, the CTCSS function is notavailable. It is recommended to use it with theDTSS function.3. The tone Alert System can not be use inconjunction with Scan.147From The N3UJJ.COM Document Library

5-12 APO (Automatic Power Off)· The automatic power-off function turns the power offautomatically if you forget. It does not operate duringscanning. The initial setting IS OFF.1. To turn the APO function off and on, press the F keyfor longer than 1 second, then press the MHz/LOCKkey within 10 seconds. The APO indicator lights.2. If, after 2 hours 59 minutes in inactive receive mode,no key has been pressed, the APO indicator flashesand a beep sounds. If no key is pressed for 1 minuteafter that, the display indicates the following, all thefunctions are disabled, and the transceiver enters theautomatic power-off state.5-13 DIM (DIMMER)The intensity of dial illumination can be set to one offour levels.1. Press the F key, then press the LOW/DIM key whilethe F indicator lights.a·,rg· L-~-~----.7:J:::o :l&-·GoeeQe 8o8 ~2. Select the desired value with the tuning control orthe UP /OWN key on the microphone.3. If, after 10 seconds, no key has been pressed, the dis·played level is set and the original frequency is redisplayed.3. To leave the automatic power-off state, turn thepower switch off and on again.r ,JNO~S1 1. A small current flows during the automatic power off state. If· the transceiver is not going to be used, be sure to switch the 1, power oil. . _ . _ 1I 2. If the APO functton ts turned on and then the bell funct1on IS ;turned on, the automatic power-off function does not work un- I1til the bell function is turned off (though the indicator lights). I3. This function is not available when the remote controller is con· IIL nected. _ _ _ ---~~----~~-~-j48IFrom The N3UJJ.COM Document Library

5-14 BEEPThe beep can be turned on and off.Press the F key for longer than 1 second, then press theREV /STEP key while the F indicator is flashing.Each time this is done, the beep is turned on or off.~LOCKThe panel keys (except F and MHz/LOCK key) and thetuning control are disabled. However, themicrophone function works.Press the F key, then press the MHz/LOCK key within10 seconds. The LOCK indicator lights.

,7 MAINTENANCE7-1 GENERAL INFORMATIONYour transceiver has been factory aligned and tested to specification before shipment. Under normal circumstancesthe transceiver will operate in accordance with these operating instructions. All adjustable trimmers and coils inyour transceiver have been adj.;sted at the factory and should only be readjusted by a qualified technician withproper test equipment. Attempting service or alignment without factory authorization can void the transceiver'swarranty.When operated properly, the transceiver will provide many years of service without requiring realignment. The in·formation in this section gives some general service procedures which can be accomplished without sophisticatedtest equipment. · ··7-2 SERVICEIf it ever become necessary to return the equipment to your dealer or service center for repair, pack it in its originalbox and packing, and include a full description of the problems involved. Please include your daytime telephonenumber. You need not return accessory items unless directly related to the service problem.Service note:Dear OM, if you desire to correspond on a technical or operational problem, please make your note short, complete,and to the point, and PLEASE make it readable.Please list: Model and serial number.The problem you are having.Please give sufficient detail for diagnosis. Provide information such as other equipment in the station, meterreadings and anything else you feel might be useful in attempting diagnosis.Caution:Do not pack the equipment in crushed newspapers for shipment. Extensive damage may result during shipment.Notes:1. Record the date of purchase, serial number and dealer from whom purchased.2. For your own information, retain a written record of any maintenance performed on the unit.3. When claiming warranty service, please include a photocopy of the bill of sale, or other proof of purchaseshowing the date of sale.50From The N3UJJ.COM Document Library

,7-3 IN CASE OF DIFFICULTYThe problems described in this table are failures caused, in general, by improper operation or connection of thetransceiver, not by defective components. Check according to the following table.Symptom I Probable causeCorrect've act1oniIndicators do not light and no receiver noise is 1. Bad power cable or connections.Check cables and connections.11.1heard when the POWER switch is turned on. ; 2. Blown power supply fuse. 2 Check for the cause of the blown fuseand replace the fuse.r----· .. ·-·--·-·---·- -~·-·-·-·-·-·-·---·-·No sound from the speaker. No signal can be L SqueJc:, is closed. .1. Turn the S%L control counterclockwise.1received. i 2. With the TSU·6: CTCSS is operating.i2Press the T NE/T.ALT key to turn offtheCTCSS.1-- ..No transmitter output.! 1I . Microphone is not plugged in. !1. Plug jack in ... 2. Poor antenna connection. vu""~' antenna securely.IWeak signal cannot be received. I P, a""""' 1a connection. 1 (.;

8. OPTIONAL ACCESSORIESI• MC-44/MC-44E (E: European Version)MUL Tl FUNCTION MICROPHONE• MC-44DM/MC-44DME(E: European Vers1on)MUL Tl FUNCTION MICROPHONEWITH AUTOPATCH• MC-85 MICROPHONE (8-pin)The MC-85 IS a unidirectional h1gh-classelectret condenser microphone provided withan output selector sw1tch, audio levelcompensation circuit, iow cut filter, level meter,PTT ana LOCK switches.• MC-60A MICROPHONE (8-pin)The zinc d1e-cast base provides high stability­The MC-60A IS complete with PTT andLOCK sw1tches, UP/DOWN switches,impedance selector swttch and a built-in preamplifier_Using MC-60A withthe transceiver doesnot comply with theEuropean EMCstandard.• MC-80 MICROPHONE (8-pin)The MC-80 is an omnidirectional electretcondenser microphone that Is orovided withUP/DOWN switches, volume adjustment foroutput level, PTT anc/-LOCK switches, and abu1l\-1n pre-amplifier_• PS-33REGULA TED DC POWER SUPPLY• SP-41 MOBILE SPEAKER(4 ohms)• SP·50B MOBILE SPEAKER (8 ohms)Compact and smart, htgh quality external speakerprovides flexibility or installation for maximumconventence.• DTU-2DTMF UNITNOTE: 1750 Hz repeater access tone is only available from MC·44E or MC-44DME European version microphone_52From The N3UJJ.COM Document Library

• TSU-6CTCSS UNIT• PG-3GDC LINE NOISE FILTER• DRU-1DIGITAL RECORDINGUNIT• PG-2NDC POWER CABLE• MB-201 • MB-12MOBILE MOUNTING BRACKET MOBILE MOUNTINGBRACKET53From The N3UJJ.COM Document Library

Installing a~cessories. CAUTION1. Before installation , be sure to disconnect the DCpower supply,or battery, or damage may occur theequipment.2. You can not install the digital recording unit(DRU1) and the DTMF unit together.You should choose one unit to install.Digital Recording Unit DRU-11. Remove the 2 screws securingthe Top cover.Carefully remove the topcover. (Fig. 1)CTCSS unit TSU-6The use of the optional sub-audible tone decoder TSU·6 allows CTCSS (Tone squelch} operation. When this op·tion is active squelch Will onfy open when the propertone is received.Installation1. Remove the 2 screws securingthe Top cover.2. CarefullY. remove the topcover .. (Fig.l)3. Remove the backing fromthe small cushion providedwith the TSU-6 and attachFig. 1it to the back of the TSU-6as shown in Fig. 2.4. Attach the cable fromTSU-6 as shown in Fig. 2.5. Remove the backing fromthe other side of the smallcushion and attach theTSU-6 to the transceiver asshown.6. Replace the cover andtighten the screws tocomplete the installa·tion.Cushion •..Fig. 2TSU-5 unrt2. Attach the three cablesfrom the DRU-1 in thetransceiver as shown inFig. 3. Don't forget to at·tach the TSU-6 as shownif you are installing thisun1t at the same time(Fig. 4).3. Tighten the screws(Fig. 5).4. Replace the cover andtighten the screws tocomplete the installa·tion.\\ "Rou7e the W!rll"'QFig. 5Fig.3Fig. 454From The N3UJJ.COM Document Library

DTMF unit DTU-21. Remove the 2 screws securing the Top cover.DTU-22. Carefully remove the top cover. (Fig.l )3. Remove the backing from the small cushionprovided with the DTU-2 and attach it to the back ofthe DTU-2 as shown in Fig. 2Fig. 14. Plug the three connectors into the sockets in theunits.Fig. 25. Attach the cable from DTU-2 as shown in Fig. 2 and 3.6. Replace the cover and tighten the screws to completethe installation.Olnstalling TSU-6 and DTU-2Attach these units on the top of VCO shield (Fig.3).l'ig. 355From The N3UJJ.COM Document Library

56From The N3UJJ.COM Document Library

KENWOODFrom The N3UJJ.COM Document Library