Technical data

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Chapter 4, Test, Parameter, and Pass/Fail Limit Descriptions

TEST_15. RX Audio Squelch Sensitivity

This test measures the minimum signal level required from a standard input

signal, which, when modulated at standard test modulation, will open the receiver

squelch.

Both “threshold” and “tight squelch” sensitivity are measured in this test.

Threshold sensitivity is measured with the squelch adjusted for

≥40 dB noise

quieting. Tight squelch sensitivity is measured with the squelch adjusted to the

tight (maximum) test position.

Audio connections from the radio to the test set are required for this test.

Threshold and tight squelch sensitivity are both measured in µV.

Pass/Fail Limits Used

Pass/Fail Limit 15, RX Threshold Squelch Sensitivity

Pass/Fail Limit 16, RX Tight Squelch Sensitivity

Test Parameters Used

Parameter 1, RT External Pad and Cable Loss

Parameter 11, RX Maximum Audio Power

Parameter 15, RX Squelch Preset Only

Parameter 16, RX Standard RF Input Level

Parameter 17, RX Tolerance for Setting Volume

Testing Conditions Defined by the Software

•If Parameter 14, RX Squelch Control is set to indicate that the radio only has a preset

squelch, the section of the test measuring “tight squelch” sensitivity is skipped.

• During testing, volume is adjusted to be at 60% rated system deviation at a 1 kHz rate.