1200 Series Professional VHF Wireless Systems - Audio-Technica

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(Cont. from pg. 2)Attach the antennas to the antenna input jacks. The antennasare normally positioned in the shape of a “V” (45° fromvertical) for best reception.Do not try to move the antenna rod after the connectorshell has been tightened down. Always loosen theconnector shell completely before repositioning the rod.If there is not sufficient space above the receiver and/or if thereceiver is installed in a metal cabinet, the antennas can bemounted in the threaded holes in the back of the connectorsso the antennas will stick straight out from the back of thereceiver. Use one set of threaded holes or the other; do notattempt to bend the antenna rods. The optional accessoryATW-RA1 rack-mount antenna kit brings antenna inputs to thefront of the receiver. When two receivers are mounted sideby-sidein single 19" rack space, one ATW-RA1 is required foreach receiver.Power ConnectionsConnect to a standard 120 volt 60 Hz AC power outlet. Ifthere is no AC power available, the back panel is equippedwith a jack for an external 12-18 volt DC source. The jacktakes a standard 2.5 mm I.D. coaxial DC power plug, centernegative. Power from the DC input jack is switched by thefront-panel Power switch.Transmitter SetupBattery Selection and InstallationAn alkaline 9-volt battery is recommended. Make certain thetransmitter power switch is Off before installing or changingbatteries.When inserting the battery, observe correct polarity asmarked inside the battery compartment. The transmitterhousings are designed to prevent incorrect installation of thebattery; do not force the battery in. Reversed batteries maycause damage to the transmitter.Handheld Transmitter Battery Installation1. While holding the middle of the microphone body normally,unscrew the battery cover (bottom 3" section) as shown inFigure G.2. Lift the white “battery keeper” arm and carefully insert afresh 9V alkaline battery, observing polarity markings(Fig. H).3. Replace the battery cover. Do not overtighten.Fig. GFig. HBattery Condition IndicatorAfter the battery is installed, turn the power on. The batterycondition indicator LED (Fig. I/J) should flash momentarily.If it does not, the battery is installed incorrectly or it is dead.If the indicator LED stays on (does not flash), the batteryvoltage is low and the battery should be replaced. If thishappens during use, replace the battery immediately toensure continued operation.UniPak Transmitter Battery Installation1. Slide off the battery cover as shown in Figure E.2. Insert a 9V battery, observing correct polarity as markedinside the battery compartment.3. Replace the battery cover. Set the cover in place on thetransmitter as shown in Figure F, so it rests fully on thecase, then slide it forward firmly until it clicks closed.Fig. IInputConnectorBatteryConditionIndicatorPower Switch(Off/Standby/On)Power Switch(Off/Standby/On)Fig. JBattery ConditionIndicatorFig. EUniPak Transmitter Input ConnectionConnect an audio input device (microphone or guitar cable) tothe audio input connector on the bottom of the transmitter. Anumber of Audio-Technica professional microphones and cablesare available separately, pre-terminated with a UniPak inputconnector (see “Optional System Accessories” on page 6).Fig. F4
System OperationTurn down the AF Level of the receiver as well as the mixer.Switch on the receiver. Do not switch on the transmitter yet.Receiver On…The power indicator will light up and one of the tuner operationindicator LEDs (A or B) will light, even though the transmitter isnot on. If any of the RF LEDs light up at this point, there may beRF interference in the area, or a nearby TV station is on thesame frequency. Check the frequency of the system against thechart on page 7 to ensure you have the proper frequency foryour area. The frequency is marked on the back panel of thereceiver.Transmitter On…When the transmitter is switched on and in normal operation,the receiver’s RF signal level indicators will light up from left toright. For optimum performance at least four, and preferably five,of the signal strength indicators should light up when the transmitteris switched on. The transmitters have a three-positionpower switch. When the switch is set to “Standby,” the transmitterproduces RF with no audio signal. When the switch is“On,” the transmitter produces both RF and audio.For INSTRUMENT: Next, while again playing the instrumentat typically-loud levels, adjust the receiver’s AF Level control sothe highest signal level causes no input overload in the instrumentamplifier, and yet permits the amplifier’s input levelcontrols to operate in their “normal” range (not set too highor too low).NOTE: With some instrument amplifiers, the receiver’s AF Levelcontrol may need to be adjusted to between “0” and “+6” tobetter drive the amplifier.CAUTION! The small trimmer controls are delicate; use only asmall screwdriver or alignment tool with a maximum 3 /32"-wideblade. Do not force the trimmers beyond their normal 210°range of rotation.MicrophoneTrimmer (M)GuitarTrimmer (G)Setting LevelsCorrect adjustment of transmitter audio input, receiver audio output,and mixer/amplifier input and output levels is important foroptimum system performance.• ATW-T35 UniPak TransmitterTrimmer adjustments in the UniPak transmitter (Fig. K) willenable you to use microphones or instruments with differentoutput levels.1. Set both the transmitter Mic Level (M) and Guitar Level (G)controls to their full counter-clockwise position (minimum). (Thelevel control not being used should be set to minimum.)2. Set the receiver’s AF Level control to “0.”3. Plug the mic or instrument into the transmitter and power upthe system.4. For MIC: Make an initial adjustment of the mixer’s levelcontrols that will allow audio through the system as you increasethe transmitter’s Mic Level.For INSTRUMENT: Make an initial adjustment of the instrumentamplifier input level control that will allow audio throughthe system as you increase the transmitter’s Guitar Level.5. For MIC: While speaking/singing into the microphone at typically-loudlevels, turn up the transmitter’s Mic Level (M) controluntil the maximum audio output of the mic lights about three orfour green LED segments on the receiver’s AF Level indicator.For INSTRUMENT: While playing the instrument at typicallyloudlevels, turn up the transmitter’s Guitar Level (G) control untilthe maximum audio output of the instrument lights about threeor four green LED segments on the receiver’s AF Level indicator.NOTE: Do not set the transmitter level too high (as indicatedby lighting of the red LED) – doing so will cause the system tooverload and distort.6. For MIC: Next, while again speaking/singing into themicrophone at typically-loud levels, adjust the mixer’s input trimcontrol so the highest sound pressure level going into the microphonecauses no input overload in the mixer, and yet permitsthe mixer’s channel and output level controls to operate in their“normal” range (not set too high or too low).NOTE: With the receiver’s AF Level control set at “0,” thebalanced output voltage will be similar to that of a typical wiredmicrophone. However, the AF Level control may be adjustedto accommodate some microphone inputs – for example, thosewith limited-range or no input trim controls.Fig. K• ATW-T36HE and ATW-T37C Handheld TransmittersThe 1200 Series handheld transmitters have factory pre-setaudio input levels.1. Set the receiver’s AF Level control to “0.”2. Turn the transmitter on and power up the system.3. Turn down the mixer’s input trim control (if provided) onthe selected channel; make an initial adjustment of the mixerchannel and output level controls that will allow audio throughthe system.4. While speaking/singing into the microphone at typically-loudlevels, adjust the mixer’s input trim control so the highest soundpressure level going into the microphone causes no input overloadin the mixer, and yet permits the mixer’s level controls tooperate in their “normal” range (not set too high or too low).NOTE: With the receiver’s AF Level set at “0,” its balanced outputvoltage will be similar to that of a typical wired microphone.However, the AF Level may need to be adjusted to accommodatesome microphone inputs.Receiver SquelchThe squelch control on the back panel of the receiver is presetat the factory, but can be adjusted if you must use the systemin an area with considerable RF interference. If there isinterference in the receiver's audio, adjust the squelch control sothe system will receive the signal from your transmitter but will“squelch” or eliminate the unwanted background RF noise. Thisadjustment can cause a reduction in useable range of the wirelesstransmitter, so set the control to the lowest position thatreliably mutes the unwanted RF signals.5
Page 6 and 7: Specifications †Optional System A
Page 8: Ten Tips To Obtain The Best Results

1200 Series Professional VHF Wireless Systems - Audio-Technica

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