Alignment Procedure - Realistic HTX-100 Service Manual

ALIGNMENT PROCEDURE
ALIGNMENT OF P.L.L. AND CARRIER OSCILLATOR PORTION
1. Test Equipment Required
DC Power Supply ( 13.8 V)
Frequency Counter
Dummy Load (50 ohm)
2. Preparation for Alignment
F-LOCK OFF
TX/RX SW : RX
3. Alignment Procedure
Step
Preset to Adjustment
1
Mode: RX, CW
L302
S.S.G.: 29 MHz
2 Same
L303
3 Same
L 313
4
S.S.G.: 29.699MHz
L 312
Mode: RX, CW
5 Same
L 321
-
6
Same as step 1 . VR303
7 Same as step 1 .
VR302
8
Same as step 1 . VR 301
9 Same as step 4. L 317
10 Same as step 7.
No alignment
11 Same as step 1 . L 321
Oscilloscope
DC Voltmeter
MODESW CW
RIT Middle position
Remarks
Connect a DC voltmeter to TP 301 .
Adjust L 302 for 4
±
0.1 V reading on the DC voltmeter.
Connect an oscilloscope to TP 302.
Adjust L 303 for maximum reading on the oscilloscope.
Connect a frequency counter and the oscilloscope to TP 303.
Adjust L 313 for 10.695 MHz
±
10 Hz reading on the frequen-
cy counter.
Connect the oscilloscope to TP 307.
Adjust L 312 for maximum reading on the oscilloscope.
Connect the oscilloscope and the frequency counter to TP
307.
Adjust L 321 for 22.0009 MHz ± 10 Hz reading on the fre-
quency counter.
Adjust VR 303 for 22.0000 MHz ± 1 0 Hz reading on the fre-
quency counter.
Connect the oscilloscope to TP 305.
Adjust VR 302 to obtain the waveform as shown on the Fig. 1.
Connect the oscilloscope to TP 306.
Adjust VR 301 to obtain the waveform as shown on the Fig. 1.
Connect the DC voltmeter to TP 303.
Adjust L 317 for 5.5 V
±
0.1 V reading on the DC voltmeter.
Connect the DC voltmeter to TP 303.
Check if voltage is more than 3 V at TP 303.
Connect the oscilloscope and the frequency counter to TP304.
Adjust L 321 for 38.695 MHz ± 20 Hz reading on the frequency
counter.
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