2) Turn unit on at 220V 50 Hz input.
3) Reading should be 1 3.8 Volt. If necessary adjust, RV1.
Transmitter
Alignment
Connect testing equipment to the unit as shown:
Dummy Plug
P LL AUgment (PTOS006)
1) Connect frequency counter to TP1 (or IС1 pin #3) through 1,000 pF capacitor.
2) Adjust CT 1 for 10.240 MHz. Tolérance within ±50 Hz is acceptable.
Off-Set Frequency Alignment (PTOS006, unless otherwise notedj
1 ) Connect frequency counter to TP4, with maximum level range.
2) Set the Mode selector to
USB.
3) Set the Band selector to
Lo.
4) Adjust CT2 for 20.105 MHz ±40 Hz.
5) Set the Band selector to
Miel.
6) Adjust CT3 for 20.330 MHz ±40 Hz.
7) Set the Band selector to
Hi.
8) Adjust CT4 for 20.555 MHz ±40 Hz.
9) Set the Band selector to
Mid,
the Channel selector to 60.
10) Connect scope to TP4.
11) Adjust T1 for maximum scope amplitude.
1 2) Connect frequency to TP5 (PTBM058).
13) Adjust CT5 (PTBM059) for 10.695 MHz ±50 Hz.
LS B Off-Set Alignment
1 ) Set the Mode selector to LSB, the Band selector to
Lo.
2) Connect frequency counter to TP4 (PTOS006).
3) Adjust CT5 (PTOS006) for 20.1035 MHz ±40 Hz.
4) Connect frequency counter to TP5 (PTBM059).
5) Adjust CT4 for 10.692 MHz ±50 Hz.
VCO Alignment
1 ) Set the Band selector to
Lo
and the Channel selector to 1.
2) Connect digital Voltmeter between TP2 and ground.
3) Adjust VCO block core to obtain 3.6V ± 0.1 V.
4) Set the Channel selector to 41, and the Band selector to
Mid.
5) Adjust VR1 for 3.7V ± 0.1V.
6) Set the Channel selector to 1, and the Band selector to
H i
(81 channelO.
7) Adjust VR2 for 3.8V ± 0.1V.
RF Power Am plifier Alignment (PTBM058, unless otherwise noted)
1 ) Set the Band selector to
Lo
and the Channel selector to 1.
2) Set the Mode switch to USB.
3) Feed 2,400 Hz 10 mV audio to unit.
4) Adjust T3 (PTOS006) and T5 (PTBM058) for maximum scope display.
5) Set the Band selector to
H i
and the Channel selector to 40 (120 channel).
6) Adjust T2 (PTOS006) and T4 (PTBM058) for maximum scope display.
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