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August 16, 2007
6816985H01-B
7.4.4-2
700/800 MHz Troubleshooting Waveforms:
RF Test Points
7.4.3 RF Test Points
The following RF block diagram and accompanying table (
) shows the location of key
probe points (PP) and test points (TP) for the XTS 2500 radio.
Figure 7.4-1. RF Block Diagram Test Points
Antenna
Switch
TX
Power
Amplifier
TRB
Level
Shifter
Harmonic
Filter
VCO
Buffer IC
Buffer
Output
Match
VCO
Antenna
Switch
Preselector #1
(Tunable)
Preselector #2
(Fixed)
Mixer
Abacus CS
Crystal
Filter
Abacus 3
3V DC
5V DC
5V DC
Sampling
Clock
Tank
2nd LO
VCO
3
4
6
7
8
9
10
#
11
1
2
19
12
20
18
21
13
14
25
26
27
15
16
17
22
23
36
24
31
28
29
30
RF
Bias
DC
Probe/Test Point
Legend
5
32
MAEPF-27353-O
DAC
16.8MHz
Crystal
LV-FractN
Synthesizer
Coupler
Detector
RF
Amplifier
Abacus 3V
Regulator
PCIC
Capacitive
Multiplier
Chip Select
35
SPI Clock
34
SPI Data
33
SSI Sync B
40
SSI FS
39
SSI Clock
38
SSI Data
37
Test Points Not Shown
Summary of Contents for ASTRO MT 1500
Page 4: ...iv Table of Contents August 16 2007 6816985H01 B Notes ...
Page 164: ...August 16 2007 6816985H01 B 5 6 Troubleshooting Procedures Operational Error Codes Notes ...
Page 188: ...August 16 2007 6816985H01 B 6 1 24 VHF Troubleshooting Charts Secure Hardware Failure Notes ...
Page 212: ...August 16 2007 6816985H01 B 6 2 24 UHF1 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 236: ...August 16 2007 6816985H01 B 6 3 24 UHF2 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 710: ...9 2 40 UHF1 Schematics Board Overlays and Parts Lists August 16 2007 6816985H01 B Notes ...
Page 806: ...9 5 32 900MHz Schematics Board Overlays and Parts Lists August 16 2007 6816985H01 B Notes ...
Page 816: ...Index 4 August 16 2007 6816985H01 B Notes ...
Page 817: ......