IC-910H Service manual.pdf - N3UJJ

SOFTWARE ADJUSTMENT (continued)ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATIONADJUSTMENTITEM (6)RF PEAK12• Enter software adjustment mode (Referpage 5-12).• Push [6] key to enter the RF peak adjustmentfor TX.• Connect an RF power meter to [VHF ANT]connector.• Connect an SSG to P501 on the PA unitvia the JIG cable (A) and set as:Frequency : 10.850 MHzLevel : 18 mV* (–22 dBm)Modulation: OFFNOTE: While transmitting, adjust SSG’slevel and keep the output power less than30 W.USBUSBPush [RIT] key to strat transmitting.• Pushing [SET] key, tune the [MAINDIAL] to maximum.• Adjust L501, L502 on the PA unit(illustration for location page 5-9) tomaximum.• Pushing [SET] key, tune the [MAINDIAL] to maximum, then push [RIT]key to store peak setting into memoryand to step next.3USB(1) Pushing [ATT] key, tune the[MAIN DIAL] to maximum.(2) Pushing [SET] key, tune the[MAIN DIAL] to maximum.(3) Repeat (1) and (2) several timesuntil output power will be peak,then push [RIT] key to store peaksetting into memory and to stepnext.4USBSame as step 3. Then turn powerOFF and ON to return the normaloperation mode. Then continue toadjust from step 4 of the RF PEAKadjustment (page 5-8).ADJUSTMENTITEM (7)TX POWER/METER(for 144 M)12• Enter software adjustment mode (Referpage 5-12).• Push [7] key to enter the TX power/meteradjustment.• Connect an RF power meter to [VHF ANT]connector.CWCWPush [RIT] key to strat transmitting.Tune the [MAIN DIAL] to 100 W(High power). Push [RIT] key tostore the adjustment value intomemory, and to step next.3CWTune the [MAIN DIAL] to 50 W(Middle power). Push [RIT] key tostore the adjustment value intomemory, and to step next.4CWVerify the output power (Low power)is 1–5 W, then push [RIT] key to stepnext.(for 1200 M)5• Connect a digital multimeter or oscilloscopeto check point CP1631.CWPush [RIT] key to strat transmitting.6CWTune the [MAIN DIAL] to 3.0 V at thecheck point CP1681. Push [RIT] keyto store the adjustment value intomemory, and to step next.*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.5 - 16From The N3UJJ.COM Document Library