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6881076C25-E
September 5, 2008
Troubleshooting Procedures
: Power Amplifier Procedures
4-33
NOTE:
For antenna switch transmit bias conditions, RF drive must be removed from PA.
29
–
–
–
–
–
–
9.6-V Programming (N.C.)
30
–
–
–
–
–
–
9.6-V Programming (N.C.)
31
0
0
0
0
0
0
Ground
32
10.8
13.6
16.5
10.0
13.0
16.0
Decoupled A+
33
4.0
5.0
0
0.2
TX PA Enable (from U520-25)
34
0
1.3
Control AMP one-shot
35
0
0
Lock (5-V of Synth Out of Lock)
36
0
0.8
Control AMP one-shot
37
10.8
13.6
16.3
10.0
13.0
16.0
A+ (Current Sense +)
38
10.8
13.6
16.3
10.0
13.0
16.0
Current Sense - Voltage Delta 150 mV (30 Watt
only)
39
0
9.2
9.4
9.8
Keyed 9.4-V in
40
1.5
3.0
4.5
1.5
3.0
4.5
Current Limit D-A (max current at 4.5 V)
41
0
0
0
0
0
0
Ground
42
0
2.2
9.6
Control AMP Output (Approx 1/2-V Control)
43
1.3
7.0
Loop Integrator Capacitor
44
2.1
3.2
Control AMP Reference
Q0500E
13.0
13.0
A+
–
CR0500 Drop
Q0501C
12.3
12.3
VQ0500E
-
B/E Drop
Q0501E
0.2
0.2
V pin 23
-
B/E Drop
Q0503E
0
1.5
V pin 42
-
B/E Drop (TX)
Q0503C
13.6
9.0
Q0504B
13.6
12.9
A+
-
B/E Drop (TX)
Table 4-11. Power Control DC Voltage Chart (Continued)
LOCATION
RX MODE
TX MODE
COMMENTS
LOW
TYP
HI
LOW
TYP
HI
Summary of Contents for ASTRO Digital Spectra
Page 2: ......
Page 6: ...September 5 2008 6881076C25 E iv Document History Notes ...
Page 20: ...xviii List of Tables September 5 2008 6881076C25 E Notes ...
Page 24: ...September 5 2008 6881076C25 E xxii CommercialWarranty Notes ...
Page 48: ...September 5 2008 6881076C25 E xlvi Model Numbering Charts and Specifications Notes ...
Page 142: ...September 5 2008 6881076C25 E 3 82 Theory of Operation Power Amplifiers Notes ...
Page 434: ...September 5 2008 6881076C25 E Glossary 10 Notes ...
Page 440: ...Index 6 September 5 2008 6881076C25 E Notes ...
Page 441: ......