29-LX ALIGNMENT
REVISION: 00
ENG-29-LX-08
2.0
Ali
gnment of P.L.L. portion of CB and WX.
2.1
Equipment required:
A: Oscilloscope
B: DC voltage meter .
2.2
Alignment procedure:
TEST ITEM
TEST CONDITION & PROCEDURE
PURPOSE
1.
CB TX VCO voltage
@ CH40
1.
CB TP3 OUTPUT
@ TX mode
2.
WX VCO voltage
@ CH8 / CH10
Connect the DC volt. Meter to the
junction point of R59 and R60.
Connect the oscilloscope to the junction
point of R6 and JP14.
Connect the DC volt. Meter to the TP601
Adjust
L19
to obtain approximately
3.0V
0.2V reading.
Adjust
L20
for maximum output on
the oscilloscope.
1.
Adjust L605 to obtain approx 1.5
0.1V
@CH8 (162.650MHz)
2.
Checking the CH10 the volt
≤
3.0V
3.0
Alignment of CB receiver portion.
3.1
Equipment required:
A: Signal generator
B: AC voltmeter.
C: Oscilloscope.
D: Dummy load ( 8 ohm, 5 watts, resistive.) E:
DC power supply ( 13.8 v. 2Amp.)
3.2
Alignment procedure:
TEST ITEM
1. AUDIO OUTPUT
2. RX Sensitivity
3. NB
4.Tight Squelch
5. “S-9” and +30 meter
indicator.
6. PA output RF Level
@1mV, 30% Mod.
TEST CONDITION & PROCEDURE
1.
Set channel 19.
2.
Set the S.G. on 27.185MHz with 1KHz,
30% mod. and 1mV output level.
3.
Set NB/OFF SW to OFF, Squelch to min.
( CCW), CB/WX/PA to CB, ANL SW to
CB/ANL, RF GAIN to max. Volume
approximately Center.
1.
Same as above step 1 and 3.
2.
Set the S.G. on 27.185MHz with 1KHz,
30% mod. RF output level 1.0uV.
1.
Set NB/OFF SW to NB.
2.
Set the level of S.G. to 1.0uV.
3.
Noise generator to on.
4.
Adjusted then revert item 1 setup.
1.
Set Squelch volume to maximum ( CW ).
2.
Set the level of S.G. to 1500uV.
3.
Adjusted then revert item 1 setup.
1.
Set the level of S.G. to 100uV.
2.
Set the level of S.G. to 3.16mV.
1. Set CB/WX/PA to PA function
PURPOSE
1.
Adjust
L1,2,3,4,5,6
&
7
for
maximum audio output & minimum
distortion on the distortion meter.
1.
Adjust
L1,2,3,4,5,6
&
7
for more
than 12dB to the SINAD meter.
2.
Repeat as needed.
3.
Set RF S.G. output level 0.4uV, the adj.
VR2
to 2V on the AC volt meter.
1.
Turn the volume to obtain 2V reading
on AC voltmeter.
2. Adjust
L1
for minimum reading on AC
volt meter.
1.
Slowly turn
VR4
to a position that the
audio output waveform at the scope
just appears from no output.
1.
Adjust
VR1
for “S-9” reading on
The LCD meter.
2. Check the bars up to +30.
1. Checking the audio output need more
than 3.5W @10%THD
Page: 4 / 6
print date: 10-6-22
