Tx Audio 1 Khz Tone; Mhz Buffer Input And Output; Khz Clock Outputs; Spi B Data - Motorola XTS 2500 Service Manual

Chapter 7.4 700/800 MHz Troubleshooting Waveforms
7.4.1 Introduction
This chapter contains images of waveforms that might be useful in verifying operation of certain
parts of the circuitry. These waveforms are for reference only; the actual data depicted will vary
depending upon operating conditions. This manual is to be used in conjunction with the ASTRO XTS
2500/XTS 2500
number 68P81094C09), which uses the pass/fail service approach to radio problems.

7.4.2 List of Waveforms

Table 7.4-1 lists each waveform and the page on which the waveform can be found.
Waveform
Antenna Input
TX Signal at Harmonic Filter Input
Coupler RF Out
TX Signal at PA
Coupler RF Feedback to PCIC
PCIC Control Voltage
TX LO
Higher Level Voltage Multiplier
Superfilter Output
TRB
Prescalar Input to FracN Synthesizer
Reference Crystal Output
Mod In
1st LO Control Voltage
VCO Output
VCO RX LO
Frequency Out (16.8 MHz)
RX RF Input at Antenna Switch
Antenna Switch Bias
Preselector Tuning Voltage
RX RF Input after Antenna Switch
Analog 5V
Preselector 1 Output
I
/XTS 2000/ATS 3000 Digital Portable Radios Basic Service Manua (Motorola part

Table 7.4-1. List of Waveforms

Page No.
7.4-6
7.4-7
7.4-8
7.4-9
7.4-10
7.4-11
7.4-12
7.4-13
7.4-14
7.4-15
7.4-16
7.4-17
7.4-18
7.4-19
7.4-20
7.4-21
7.4-22
7.4-23
7.4-24
7.4-25
7.4-26
7.4-27
7.4-28
Waveform
Low-Noise Amplifier Output
Preselector 2 Output
Mixer Out (IF)
Crystal Filter Out
Abacus Analog 3V
2nd LO Control Voltage
2nd LO VCO Buffer Output
Abacus Digital 3V

TX Audio 1 kHz Tone

16.8 MHz Buffer Input and Output

32.768 kHz Clock Outputs

SPI B Data

RX Serial Audio Port (SAP)

SPI Data
SPI CLK
Universal Chip Select
Abacus Chip Select
RX SSI Data
RX SSI Clock
RX SSI Frame Sync
RX SSI Sync B
Page No.
7.4-29
7.4-30
7.4-31
7.4-32
7.4-33
7.4-34
7.4-35
7.4-37
7.4-38
7.4-39
7.4-40
7.4-41
7.4-42
7.4-43
7.4-44
7.4-45
7.4-46
7.4-47
7.4-48
7.4-49
7.4-50