29-LX ALIGNMENT
REVISION: 00
ENG-29-LX-08
4.
Alignment of WX receiver portion.
4.0
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.)
4.1
Alignment procedure:
TEST ITEM
TEST CONDITION & PROCEDURE
1. AUDIO OUTPUT
1. Set channel 5. RF connect to the TP4.
2.
Set the S.G. on 10.7MHz with 1KHz,
±3
KHz mod. and 1mV output level.
3. CB/WX/PA to WX. Volume set
approximately Center.
2. RX Sensitivity
1.
Set RF output connect to the TP1.
2.
Set the S.G. on 162.450MHz with 1KHz,
±3
KHz mod. RF output level 1.0uV.
3. Tone Decoder Sens.
1. Set unit off, RF output @1.2uV, AF
(Turn-on): @
±4
KHz
@1050Hz, RF Freq @162.450MHz
PURPOSE
1.
Adjust
L604
for maximum
2. audio output & minimum distortion on
the distortion meter.
1.
Adjust
L603
&
L602
for more
than 12dB to the SINAD meter.
Repeat as needed.
1. The unit will turn on automatically when
RF signal open.
5.
Alignment of Transmitter portion.
5.1
Equipment Required:
A: VTVM ( full scale: 1V DC with RF probe). B:
RF power meter.
C: Spectrum analyzers.
D: Frequency counter.
E: DC power supply. (13.8VDC / 3AMPs)
F: 50 ohm load and attenuator.
G: Oscilloscope.
H: AF generator.
5.2
Alignment procedure:
TEST ITEM
TEST CONDITION & PROCEDURE
PURPOSE
1. TP4 output
1.
Connect the oscilloscope to the TP4.
Adjust
L20, 21, 17
for maximum
2.
Set TX mode , Channel 19.
output on the oscilloscope.
2. TX power
1. Set TX Channel 19.
1.
Adjust
L17,14
for maximum
output on the RF power meter.
2.
Turn
L14
to obtain 4.0W on the RF
meter reading.
3. TX carrier frequency
1. Set TX Channel 19.
4. Second harmonic
1. Set TX Channel 19.
5. “P4” indicator
1. Set TX Channel 19.
6. Modulation
1.
Set TX Channel 19.
2. AF GEN. Output 30mV.
7. Talk-back
1. Set unit in TX mode with 90% Mod.
1.
Adjust
L24
to obtain 27.185MHz on
the frequency counter.
1.
Adjust
L11
for a min. 2
nd
harmonic
( 54MHz) output on the Spectrum anal.
1.
Adjust
VR5
for “P4” display at the TX
Signal meter of the LCD meter.
1.
Adjust
VR4
for 90% on the
modulation Meter.
1. The speaker can be heard the tone when
Talkback turn on.
Page: 5 / 6
print date: 10-6-22
