ATCOM AT800 Series User Manual download pdf (Page 33)

AutoTune™ User Guide

6.9. Internal Voice Modulation

The purpose of this procedure is to test the ability of the radio’s internal microphone

audio circuit to accurately transfer the received signal.

RF Control

Port

Frequency

Modulation

Attenuation

Monitor

RF IN/OUT

Test Frequency

40 dB

Table 6-21. Analyzer Configuration for Internal Voice Modulation test

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 6-22. Internal Voice Modulation test results

6.9.1. Alignment

No alignment is needed.

6.9.2. 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 user is instructed

to key the connected radio and place it next to the analyzer speaker (see Figure 6-1).

The user is also instructed to adjust the analyzer volume until about 4 kHz deviation is

seen on the analyzer display (see Figure 6-2). The deviation level is then measured by

the analyzer and the user is instructed when to un-key the radio. The measured

deviation is compared against test limits and the final results are written to the log file.

Figure 6-1. Place keyed radio next to analyzer speaker.

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ATCOM AT800 Series User Manual Page 33