AutoTune for Motorola APX Series Radios User Guide
19
4.14. Noise Squelch Threshold
This is a test only; there is no alignment.
RF Control Port
Frequency Modulation
Level
Generate
RF IN/OUT Test Freq
FM, 60% rated deviation
-125 dBm
Table 4-28. Analyzer Configuration for Noise Squelch Threshold test
4.14.1. Test
The purpose of this procedure is to verify that the squelch circuit operation performs as
expected, blocking noise but allowing stronger signals to be heard. The analyzer is
setup as specified in this section’s Analyzer Configuration table. The radio is placed into
Test Mode at the lowest RX Test Frequency. The radio audio output level is tested and
if insufficient to measure the unsquelched condition the volume is increased. Beginning
at -125 dBm, the analyzer output level is slowly increased until the radio unsquelches
OR is 6 dBm above the Max Limit, whichever comes first. The Unsquelch analyzer
output level is compared against test limits and the final results written to the log file.
Name
Description
Result
Pass or Fail. Noise Squelch Threshold level within Max Limit
Frequency
Test Frequency
Unsquelch
Analyzer output level at which the radio unsquelches
Max Limit
Maximum Limit (exclusive) for Noise Squelch Threshold to Pass
Table 4-29. Noise Squelch Threshold test results
