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4.1.2 TRANSMITTER ALIGNMENT
ITEM
BIAS Current
Set radio to CH 19 USB TX mode.
Modulation Off.
Remove "short PCB" from TP7, TP8, TP9.
Connect current meter to TP7(+) and TP9 (-)
Connect current meter to TP7(+) and TP8 (-)
SSB APC
Set radio to CH 19 USB RX mode.
Connect Multi-meter to TP7.
SSB TX Power Connect "short PCB" to TP7 and TP9.
Connect RF Power Meter to antenna jack.
Set radio to CH 19 USB TX mode.
AF signal 30mV, 1 KHz to microphone.
Set RF PWR fully clockwise.
Set MIC GAIN fully clockwise.
SSB ALC
Set radio to CH 19 USB TX mode.
AF signal 30mV, 1 KHz to microphone.
SSB Carrier
Set radio to CH 19 USB TX mode.
Balance
Set MIC GAIN fully counter-clockwise.
Connect Oscilloscope to antenna connector.
AM TX
Set radio to CH 19 AM TX mode.
High Power
Modulation Off.
Set RF POWER fully clockwise.
AM TX
Set RF POWER fully counterclockwise.
Low Power
RF Power
Set radio to CH 19 AM TX mode.
Meter
Set RF POWER fully clockwise.
Set SWR/MOD/PWR Switch to PWR
position.
AM Modulation Set radio to CH 19 AM TX mode.
AF signal 30mV, 1 KHz to microphone.
Set MIC Gain fully clockwise.
Set SWR/MOD/PWR Switch to MOD position
AM Modulation
Set radio to CH 19 AM TX mode.
Meter
AF signal 30mV, 1 KHz to microphone.
Set MIC Gain fully clockwise.
U.U.T. SETTING
- 12 -
ADJUST
MEASUREMENT
POINT
VR12
50 mA
VR10
100 mA
VR17
12.5 VDC
L40,L42,
MAX > 12W
L43,L44
Spurious Emission
Minimum.
Balance Power
Between CH1 and
CH40.
VR13
11.5 W
VR6
Spurious Emission to
Minimum.
VR14
3.8 W
VR18
0.3W±0.2W
For a needle reading
of "4" on TX PWR
VR9
scale.
For a needle reading
VR16
of 95% on the
external modulation
meter.
VR15
For a needle reading
of 95% on the
modulation scale.
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