Chapter 7.5 Troubleshooting Waveforms
7.5.1 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
I/XTS 2000/ATS 3000 Digital Portable Radios Basic Service Manual (Motorola part number
68P81094C09), which uses the pass/fail service approach to radio problems.
7.5.2 List of Waveforms
Table 7.5-1 lists each waveform and the page on which the waveform can be found.
Table 7.5-1. List of Waveforms
Waveform Page No. Waveform Page No.
Antenna Input 7.5-6 Low-Noise Amplifier Output 7.5-29
TX Signal at Harmonic Filter Input 7.5-7 Preselector 2 Output 7.5-30
Coupler RF Out 7.5-8 Mixer Out (IF) 7.5-31
TX Signal at PA 7.5-9 Crystal Filter Out 7.5-32
Coupler RF Feedback to PCIC 7.5-10 Abacus Analog 3V 7.5-33
PCIC Control Voltage 7.5-11 2nd LO Control Voltage 7.5-34
TX LO 7.5-12 2nd LO VCO Buffer Output 7.5-35
Higher Level Voltage Multiplier 7.5-13 Analog 5V 7.5-36
Superfilter Output 7.5-14 Abacus Digital 3V 7.5-37
TRB 7.5-15 TX Audio 1 kHz Tone 7.5-38
Prescalar Input to FracN Synthesizer 7.5-16 16.8 MHz Buffer Input and Output 7.5-39
Reference Crystal Output 7.5-17 32.768 kHz Clock Outputs 7.5-40
Mod In 7.5-18 SPI B Data 7.5-41
1st LO Control Voltage 7.5-19 RX Serial Audio Port (SAP) 7.5-42
VCO Output 7.5-20 SPI Data 7.5-43
VCO RX LO 7.5-21 SPI CLK 7.5-44
Frequency Out (16.8 MHz) 7.5-22 Universal Chip Select 7.5-45
RX RF Input at Antenna Switch 7.5-23 Abacus Chip Select 7.5-46
Antenna Switch Bias 7.5-24 RX SSI Data 7.5-47
Preselector Tuning Voltage 7.5-25 RX SSI Clock 7.5-48
RX RF Input after Antenna Switch 7.5-26 RX SSI Frame Sync 7.5-49
Analog 5V 7.5-27 RX SSI Sync B 7.5-50
Preselector 1 Output 7.5-28
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