Icom IC-T7H Service Manual

Also see for IC-T7H: Instruction manual Instruction manual

Contents

5 - 1SECTION 5 ADJUSTMENT PROCEDURES5-1 PLL AND TRANSMITTER ADJUSTMENTPLL LOCKVOLTAGE(VHF)(UHF)PLLREFERENCEFREQUENCYOUTPUTPOWERFMDEVIATIONDTMFDEVIATION(USA-3,SEAonly)TONE CALLDEVIATION(EUR, ITAonly)ADJUSTMENTADJUSTMENT ADJUSTMENT CONDITION MEASUREMENT VALUE POINTUNIT LOCATION UNIT ADJUST1212112341211• Displayed frequency :145.000 MHz• Receiving• Transmitting• Displayed frequency :440.000 MHz [USA-3]430.000 MHz [Other]• Receiving• Transmitting• Displayed frequency :445.000 MHz [USA-3]435.000 MHz [Other]• Transmitting• Displayed frequency :145.000 MHz• Output power: High• Transmitting• Output power: Low• Transmitting• Displayed frequency :445.000 MHz [USA-3]435.000 MHz [Other]• Output power: High• Transmitting• Output power: Low• Transmitting• Displayed frequency :145.000 MHz• Connect an audio generator tothe [MIC] connector and set as:1 kHz/95 mV• Set the FM deviation meter as :HPF : OFFLPF : 20 kHzDe-emphasis : OFFDetector : (P–P)/2• Output power: High• Transmitting• Displayed frequency :445.000 MHz [USA-3]435.000 MHz [Other]• Output power: High• Transmitting• Displayed frequency :445.000 MHz [USA-3]435.000 MHz [SEA]• Push [D] key while transmitting• Displayed frequency:435.000 MHz• Push [TONE] key while transmit-ting1FToppanelToppanelToppanelToppanelToppanelConnect a digitalmultimeter or anoscilloscope to the“VLV”.Connect a digitalmultimeter or anoscilloscope to the“ULV”.Loosely couple afrequnecy counterto the antenna con-nector.Connect an RFpower meter to theantenna connector.Connect an FMdeviation meter tothe antenna con-nector through anattenuator.Connect an FMdeviation meter tothe antenna con-nector through anattenuator.Connect an FMdeviation meter tothe antenna con-nector through anattenuator.1.3 V0.9 V – 1.7 V2.2 V1.9 – 2.5 V445.0000 MHz[USA-3]435.0000 MHz[Other]5.5 W0.5 W5.5 – 6.0 W0.5 W± 4.3 kHz± 4.3 kHz± 3.5 kHz± 3.5 kHzDUAL-VCO1F2F2FLOGICLOGICL303VerifyL301VerifyC369R302R316R304R313R308R314R147R147