Icom IC-R9500 Service Manual - Page 24
Receive Adjustments (vhf And Uhf) [rx-v/u1
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4-6 RECEIVE ADJUSTMENTS (VHF and UHF) [RX-V/U1] • Push [F-3•RX V/U1] key to select RX V/U1 ADJUSTMENT. • Connect an AC milivoltmeter to the [EXT-SP] jack. • Connect an SG to [ANT1/HF ANT3] and set as; Modulation : None NOTE: HOLD the adjustment condition (SG level and frequency etc.) until next ADJ item is displayed. ADJUSTMENT ITEM ADJUSTMENT CONDITION OPERATION VALUE TOTAL GAIN [Total Gain V/U1 PRE OFF] 1) Set the SG as; Frequency : 50.1515 MHz Level : +60 dBu Measure the AF output level and set it as the reference level (0 dB). 0 dB 2) Set the SG as; Level : OFF Rotate [MAIN DIAL] to adjust the AF −25 dB less output level. than reference Push [F-7] key. level above [Total Gain V/U1 PRE ON] • Set the SG as; Level : OFF Rotate [MAIN DIAL] to adjust the AF output level. Push [F-7] key. [Total Gain V/U2 PRE OFF] 1) Set the SG as; Measure the AF output level and set it as Frequency : 625.0215 MHz the reference level (0 dB). Level : +60 dBu 0 dB 2) Set the SG as; Level : OFF Rotate [MAIN DIAL] to adjust the AF 25 dB less output level. than reference Push [F-7] key. level above [Total Gain V/U2 PRE ON] • Set the SG as; Level : OFF Rotate [MAIN DIAL] to adjust the AF output level. Push [F-7] key. DSP GAIN-UP TOTAL GAIN 1) Set the SG as; [Gain UP Total Gain V/U1 PRE Frequency : 50.1515 MHz OFF] Level : +60 dBu Measure the AF output level and set it as the reference level (0 dB). 0 dB 2) Set the SG as; Level : OFF Rotate [MAIN DIAL] to adjust the AF 15 dB less output level. than reference Push [F-7] key. level above [Gain UP Total Gain V/U1 PRE • Set the SG as; ON] Level : OFF Rotate [MAIN DIAL] to adjust the AF 10 dB less output level. than reference Push [F-7] key. level above [Gain UP Total Gain V/U2 PRE 1) Set the SG as; Measure the AF output level and set it as OFF] Frequency : 625.0215 MHz the reference level (0 dB). Level : +60 dBu 0 dB 2) Set the SG as; Level : OFF Rotate [MAIN DIAL] to adjust the AF 15 dB less output level. than reference Push [F-7] key. level above [Gain UP Total Gain V/U2 PRE • Set the SG as; ON] Level : OFF Rotate [MAIN DIAL] to adjust the AF 10 dB less output level. than reference Push [F-7] key. level above 4 - 7