AutoTune for Motorola APX Series Radios User Guide
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4.21. Voice Modulation (internal)
The purpose of this procedure is to test the ability of the radio’s internal microphone to
accurately transfer the received signal.
RF Control Port
Frequency
Modulation Attenuation
Monitor
RF IN/OUT Test Frequency FM
40 dB
Table 4-42. Analyzer Configuration for Voice Modulation (internal) test
4.21.1. 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 4-1).
The user is also instructed to adjust the analyzer volume until about 60% rated system
deviation is seen on the analyzer display (see Figure 4-2). 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 4-1. Place keyed radio next to analyzer speaker.
