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

Chapter 7.3 UHF2 Troubleshooting Waveforms

7.3.1 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/
I
XTS 2500 /XTS 2000/ATS 3000 Digital Portable Radios Basic Service Manual (Motorola part
number 6816984H01), which uses the pass/fail service approach to radio problems.

7.3.2 List of Waveforms

Table 7.3-1 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
Prescalar Input to FracN Synthesizer
Reference Crystal Output
Mod In
1st LO Control Voltage
VCO Output
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

Table 7.3-1. List of Waveforms

Page No. Waveform
7.3-6 Low-Noise Amplifier Output
7.3-7 Preselector 2 Output
7.3-8 Mixer Out (IF)
7.3-9 Crystal Filter Out
7.3-10 Abacus Analog 3V
7.3-11 2nd LO Control Voltage
7.3-12 2nd LO VCO Buffer Output
7.3-13 Abacus Digital 3V
7.3-14

TX Audio 1 kHz Tone

7.3-15

16.8 MHz Buffer Input and Output

7.3-16

32.768 kHz Clock Outputs

7.3-17

SPI B Data

7.3-18

RX Serial Audio Port (SAP)

7.3-19 SPI Data
7.3-20 SPI CLK
7.3-21 Universal Chip Select
7.3-22 Abacus Chip Select
7.3-23 RX SSI Data
7.3-24 RX SSI Clock
7.3-24 RX SSI Frame Sync
7.3-25
Page No.
7.3-26
7.3-27
7.3-28
7.3-29
7.3-30
7.3-31
7.3-32
7.3-34
7.3-35
7.3-36
7.3-37
7.3-38
7.3-39
7.3-40
7.3-41
7.3-42
7.3-43
7.3-44
7.3-45
7.3-46