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ALIGNMENT AND TEST PROCEDURES
7-6
October 1999
Part No. 001-2009-201
3. Adjust power limit control R76 clockwise until
power is limited to 0.55 dB above 85W (95W). If
the maximum PA power is < 95W, adjust R76 until
power begins to decrease.
7.4.4 REFLECTED POWER ADJUST
1. Remove the load cable from A8.
2. Press the space bar to key the PA.
NOTE: This will not harm the PA.
3. Adjust Reverse Power Calibration Pot R680 for
equal voltages on W126 and W121 on the RFIB or
for equal Forward and Reverse Power.
4. Press the space bar to unkey the PA.
5. Apply "Glyptol" to R663, R680 and R76.
6. Press F4 to turn on/off fans. Both PA fans should
turn ON.
7. Measure temperature detector voltage at W127 on
the RFIB. Normal output at 25
°
C ambient is
approxi1.0V DC.
Figure 7-3 POWER AMPLIFIER ALIGNMENT POINTS
R680
R663
A8
R509
Q503
B
B
B
B
C
E
B
B
B
B
C
E
Q502
1
2
3
4
B
B
B
B
C
E
Q501
U501
Содержание VX 900 MHz LTR
Страница 2: ...1 2 October 1995 Part No 001 2008 202...
Страница 4: ...1 4 October 1995 Part No 001 2008 202...
Страница 24: ...INTRODUCTION AND OPERATION 1 10 October 1999 Part No 001 2009 201...
Страница 26: ...INTRODUCTION AND OPERATION 1 12 October 1999 Part No 001 2009 201...
Страница 40: ...INSTALLATION 2 14 October 1999 Part No 001 2009 201...
Страница 56: ...PULL DOWN MENUS 4 12 October 1999 Part No 001 2009 201...
Страница 60: ...REPEATER PROGRAMMING 5 4 October 1999 Part No 001 2009 201...
Страница 142: ...SERVICING 8 8 October 1999 Part No 001 2009 201...
Страница 191: ...SCHEMATICS AND COMPONENT LAYOUTS 10 9 October 1999 Part No 001 2009 201 Figure 10 14 RECEIVE VCO COMPONENT LAYOUT...
Страница 234: ...900 MHz CHANNEL FREQUENCY CHART A 6 October 1999 Part No 001 2009 201 This page intentionally left blank...