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40 Chapter 2
Testing AMPS Base Stations
Transmitter Maximum Voice Deviation
Transmitter Maximum Voice Deviation
This test measures the transmitter’s maximum FM Deviation by a voice
signal in the absence of any other modulation signal.
Prerequisites
The following conditions must be met before testing:
❒ The Test Set is turned on and Preset was pressed to establish a
known instrument state.
❒ You have configured the Test Set for channel tuning (see “Using
Channel Numbers to Set Analyzer and Generator
Frequencies” on page 68).
❒ You have specified any gains or losses in your test system (see
“Compensating for Signal Losses and Gains in the Test
Setup” on page 33).
Test Procedure
1. Turn off the base station’s RF transmitter. A transmitter can be
damaged if it is not transmitting into a specified load, such as an
antenna, power amplifier, duplexer, or power meter with a 50Ω
input impedance.
2. Verify that the transmitter’s rated RF power (or the level out of the
power amplifier if applicable) does not exceed the level indicated
next to the Test Set’s RF IN/OUT connector.
3. Connect the transmitter’s RF output to the Test Set’s RF IN/OUT
port.
4. Connect the transmitter’s audio modulation (voice) input to the Test
Set’s AUDIO OUT port.
5. Enable the transmitter’s audio (speech) modulation.
6. Turn off any modulation signals to the base station other than audio.
7. Press the
RF Anl key to access the RF ANALYZER screen.
8. Enter the transmitter’s channel number in the RF Channel field.
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