PRESIDENT HARRY III ASC, Service Manual

Page: 12 / 60

ALIGNMENT TRANSMITTER
1 - Alignment procedure(13,2V;configuration”EU,E”)
STEP CONDITION ADJUSTMENT REMARKS OF ADJUSTMENT
1 FM/AM(E)TX
Channel 20
RT201
Connect a wattmeter to jack antenna,
adjust RT201 to reach 5V±0,2V on the
DC voltmeter connected to TP104.
2 AM(EU)TX
Channel 20
RT203
Connect a wattmeter to jack antenna,
adjust RT203 to reach 1W on the
wattmeter.
3 AM(E)TX
Channel 20
RT204
Connect a wattmeter to jack antenna,
adjust RT204 to reach 4W on the
wattmeter.
4 Same as 2
Connect a dummy load to jack antenna.
Check that the “RF meter” display S1
5 Same as 3
Connect a dummy load to jack antenna.
Check that the “RF meter” display S9
6 FM(EU)TX
Mod
30 mV 1 KHz
CH 20
RT206
Adjust RT206 to reach ± 1,2KHz of
deviation.
7 AM(E)TX
Mod
30 mV 1 KHz
CH 20
RT202/RT205
First: Adjust RT202 and RT205 to the
maximum of modulation, then adjust
RT205 to reach ±90% of modulation, then
adjust RT202 to reach ± 85% of
modulation.