Icom IC-R9500 Service Manual - Page 21
Receive Adjustments (hf) [hf], Adjustment Item, Adjustment Condition, Operation, Value, Main Dial]
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4-4 RECEIVE ADJUSTMENTS (HF) [RX-HF] • Push [F-4•RX] key to enter the receive adjustment menu then push [F-1•RX-HF] key to select RX-HF ADJUSTMENT. • Connect an AC milivoltmeter to the [EXT-SP] jack. • Connect an SG to [HF-ANT1] and set as; Frequency : 14.1515 MHz Modulation : None NOTE: HOLD the adjustment condition (SG level and frequency etc.) until next ADJ item is displayed. ADJUSTMENT ITEM TOTAL GAIN [Total Gain HF PRE OFF] ADJUSTMENT CONDITION 1) Set the SG as; Level : +60 dBu 2) Set the SG as; Level : OFF [Total Gain HF PRE1 ON] • Set the SG as; Level :OFF [Total Gain HF PRE2 ON] • Set the SG as; Level : OFF DSP GAIN-UP TOTAL GAIN [Gain UP Total Gain HF PRE OFF] 1) Set the SG as; Level : +60 dBu 2) Set the SG as; Level : OFF [Gain UP Total Gain HF PRE1 • Set the SG as; ON] Level : OFF [Gain UP Total Gain HF PRE2 • Set the SG as; ON] Level : OFF EXTERNAL AGC [AGC(RX-DSP)] S-MERTER [HF S0 LEVEL] [HF S9 LEVEL] [S9+60 LEVEL] • Set the SG as; Level : +70 dBu • Set the SG as; Level : OFF • Set the SG as; Level : +34 dBu • Set the SG as; Level : +94 dBu OPERATION VALUE Measure the AF output level and set it as the reference level (0 dB). 0 dB Rotate [MAIN DIAL] to adjust the AF 30 dB less output level. than reference Push [F-7] key. level above Rotate [MAIN DIAL] to adjust the AF output level. Push [F-7] key. Rotate [MAIN DIAL] to adjust the AF output level. Push [F-7] key. Measure the AF output level and set it as the reference level (0 dB). 0 dB Rotate [MAIN DIAL] to adjust the AF 15 dB less output level. than reference Push [F-7] key. level above Rotate [MAIN DIAL] to adjust the AF 12 dB less output level. than reference Push [F-7] key. level above Rotate [MAIN DIAL] to adjust the AF 10 dB less output level. than reference Push [F-7] key. level above Push [F-7] key. (Automatic adjustment) Push [F-7] key. Push [F-7] key. (Automatic adjustment) Push [F-7] key. 4 - 4