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AutoTune™ User Guide

4.9. External Voice Modulation

The purpose of this procedure is to test the ability of an external microphone attached to

the radio to effectively transfer the received signal.

RF Control

Port

Frequency

Modulation

Attenuation

Monitor

RF IN/OUT

Test Frequency

40 dB

Table 4-22. Analyzer Configuration for External Voice Modulation test

4.9.1. Alignment

No alignment is needed.

4.9.2. Test

The radio is placed into Test Mode at the lowest TX Test Frequency. The analyzer is

setup as specified in this section’s Analyzer Configuration table. The analyzer generates

a 1 kHz signal at 800 mV into the radio’s external microphone accessory port via the

radio test set. The radio is commanded to transmit and the resulting deviation level is

then measured by the analyzer. The measured deviation is compared against test limits

and the final results are written to the log file.

Name

Description

Result

Pass or Fail. Deviation within Min Limit, Max Limit

Frequency

Test Frequency

Deviation

Measured modulation deviation level

Min Limit

Minimum Limit (inclusive) for Deviation to Pass

Max Limit

Maximum Limit (inclusive) for Deviation to Pass

Table 4-23. External Voice Modulation test results

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 43 44

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ATCOM AT800 Series User Manual Page 21