Icom ID-51A Service Manual - Page 26

5-3 TRANSMIT ADJUSTMENT (Continued) • DEVIATION ADJUSTMENTS Select an adjustment item using / , and then set the adjustment value as specified using [DIAL]. ADJUSTMENT ADJUSTMENT ITEM OPERATION VALUE FM DEVIATION -VHF[FM (BAND LOW)] [FM-N (BAND LOW)] [FM (BAND HIGH)] - [MFL] [MNL] [MFH] 1 1) Set the power supply voltage to 7.4 V. 2) Connect a modulation analyzer to the antenna connector through an attenuator, and set it as; HPF : OFF LPF : 20 kHz De-emphasis : OFF Detector : (P-P)/2 3) Connect an audio generator to the JIG cable (See page 5-1). 2 1) Set the audio generator as; Frequency : 1 kHz 3 Level : 90 mVrms 2) While transmitting, adjust the deviation using [DIAL], and then 4 push to store the adjustment value. - ±4.1 to ±4.3 kHz ±2.0 to ±2.2 kHz ±4.1 to ±4.3 kHz [FM-N (BAND HIGH)] [MNH] 5 ±2.0 to ±2.2 kHz -UHF[FM (BAND LOW)] [MFL] 6 ±4.1 to ±4.3 kHz [FM-N (BAND LOW)] [MNL] 7 ±2.0 to ±2.2 kHz [FM (BAND HIGH)] [MFH] 8 ±4.1 to ±4.3 kHz [FM-N (BAND HIGH)] [MNH] 9 ±2.0 to ±2.2 kHz REFERENCE SIGNAL DEVIATION -VHF- [FM (BAND LOW)] [BFL] 1 1) Set the audio generator as; Level : 0 mVrms (OFF) 2) While transmitting, adjust the deviation using [DIAL], and then push to store the adjustment value. [FM-N (BAND LOW)] [BNL] 2 [FM (BAND HIGH)] [BFH] 3 [FM-N (BAND HIGH)] [BNH] 4 Minimum deviation -UHF[FM (BAND LOW)] [BFL] 5 [FM-N (BAND LOW)] [BNL] 6 [FM (BAND HIGH)] [BFH] 7 [FM-N (BAND HIGH)] [BNH] 8 DV DEVIATION -VHF[BAND LOW] [BAND CENTER] 1 1) Set the power supply voltage to 7.4 V. 2) Connect a modulation analyzer to the antenna connector through an attenuator, and then set it as; - HPF : OFF - LPF : 20 kHz De-emphasis : OFF Detector : (P-P)/2 3) No audio signal is applied. 2 • While transmitting, adjust the deviation using [DIAL], and then push to store the adjustment value. 3 [BAND HIGH] -UHF[BAND LOW] 4 [DVV] 5 ±0.95 to ±1.15 kHz [BAND CENTER] 6 [BAND HIGH] 7 5 - 8