IC-910H Service manual.pdf - N3UJJ

RECEIVER ADJUSTMENTS (continued)ADJUSTMENT430 M PEAK(MAIN BAND)430 M PEAK(SUB BAND)430 MTOTAL GAIN(MAIN BAND)NOISEBLANKER(MAIN BAND)11121ADJUSTMENT CONDITION• Display frequency: 435.0200 MHz• Mode: FM• Connect a standard signal generatorto [UHF ANT] connector and set as:Frequency : 435.0200 MHzLevel : 1 µV* (–107 dBm)Modulation: 1 kHz/±5.0 kHz Dev.• Receiving• Sub display freq. : 435.0200 MHz• Mode: FM• Set an SSG as :Frequency : 435.0200 MHzLevel : 1 µV* (–107 dBm)Modulation: 1 kHz/±5.0 kHz Dev.• Receiving• Display frequency: 435.0200 MHz• Mode: USB• Set an SSG as :Frequency : 435.0215 MHzLevel : 1 mV* (–47 dBm)Modulation: OFF• Receiving• Set an SSG as :Level : OFF• Receiving• Display frequency: 145.9800 MHz• Mode: USB• [NB]: OFF• Connect an SSG to [VHF ANT] connectorand set as :Frequency : 145.98150 MHzLevel : 5.6 µV* (–92 dBm)Modulation: OFFand apply following signal to [VHFANT] connector.100 msec.ADJUSTMENTMEASUREMENTVALUEPOINTUNIT LOCATION UNIT ADJUSTMAINMAINRearpanelMAINConnect a digitalmultimeter or oscilloscopeto check pointCP851.Connect a digitalmultimeter or oscilloscopeto check pointCP852.Connect an AC millivoltmeter to [EXTSP] connector withan 8 Ω load.Connect an oscilloscopeto check pointCP101.Maximum voltageMaximum voltage1.0 V (0 dB)100 mV (20 dB of AFlevel difference as step1.)Maximum noise waveformPAPAFrontpanelPAMAINL22,L23,L282,L283L280,L281main [AF]volumeR61L102,L103(SUB BAND)2341 msec.• Receiving• [NB]: ON• Set an SSG as :Level : 3.2 µV* (–97 dBm)• Receiving• Sub display freq. : 145.9800 MHz• Mode: USB• [NB]: OFF• Set an SSG as :Level : 5.6 µV* (–92 dBm)• Receiving• [NB]: ON• Set an SSG as :Level : 3.2 µV* (–97 dBm)• ReceivingConnect an oscilloscopeto check pointCP701.*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.The noise must beblanked.Maximum noise waveformThe noise must beblanked.VerifyL703,L704Verify5 - 6From The N3UJJ.COM Document Library