Technical data

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

TEST_16. RX Squelch Blocking

This test measures the tendency of the receiver’s squelch circuit to close in the

presence of modulation on the RF signal. Audio connections from the radio to the

test set are required for this test.

Squelch blocking is measured in dB.

Pass/Fail Limits Used

Pass/Fail Limit 13, RX Squelch Blocking

Pass/Fail Limit 16, RX Tight Squelch Sensitivity

Test Parameters Used

Parameter 2, RT Full Rated System Deviation

Parameter 11, RX Maximum Audio Power

Parameter 13, RX Squelch Blocking Step Frequency

Parameter 16, RX Standard RF Input Level

Parameter 17, RX Tolerance for Setting Volume

Testing Conditions Defined by the Software

• RF level is set to 12 dB above tight squelch and volume is set to 10% of maximum rated

volume ( Parameter 10, RX CT/CDCSS Deviation).

• Audio frequency is then swept from 300 Hz to 3 kHz with deviation at the rated system

deviation ( Parameter 2, RT Full Rated System Deviation).

• The receiver’s output is monitored for blocking of the audio signal at each step of the

sweep ( Parameter 12, RX Set Radio Volume, has a minimum step size of 0.07 kHz).