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

TEST_13. RX Audio Frequency Response

This test compares the audio frequency response of your transmitter to a 6 dB/

octave pre-emphasis curve from 0.5 kHz to 2.5 kHz. Variation from that pre-

emphasis curve is measured separately from frequencies <0.5 kHz and >2.5 kHz.

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

Receiver audio-frequency response is measured in “dB error” from a 6 dB/octave

curve.

Pass/Fail Limits Used

Pass/Fail Limit 3, RX Audio Freq Resp Delta from 6 dB/Oct

Pass/Fail Limit 4, RX Audio Frequency Response Roll <0.5 kHz

Pass/Fail Limit 5, TX Audio Frequency Response Roll >2.5 kHz

Test Parameters Used

Parameter 2, RT Full Rated System Deviation

Parameter 6, RX Audio Freq Response Step Frequency

Parameter 11, RX Maximum Audio Power

Parameter 16, RX Standard RF Input Level

Parameter 17, RX Tolerance for Setting Volume

Testing conditions Fixed by the Software

• Receiver volume is set to 50% of maximum when the deviation is set to 60% of rated

system deviation.

• Deviation is the reduced to 20% of rated system deviation and a reference level is read

at a 1 kHz rate.

• The audio frequency is then swept from 300 Hz to 3 kHz (in steps determined by test

6) and the audio frequency response is measured.