Technical data

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

TEST_07. TX Microphone Sensitivity

This test measures the level of the audio-input signal required to produce 60% of

rated system deviation. The 400 Hz High-Pass Filter is used by this test if Option

010 is installed in the test set.

This test can be run in two different ways:

• The first method is the “iterative” test where Parameter 29, TX Mic Sens Set and

Measure is set to “0”. In this case, microphone sensitivity is measured by varying the

microphone voltage until 60% of rated system deviation is obtained. The required

voltage is reported in the test results and compared to Pass/Fail Limit 24, TX Audio

Frequency Response Roll >2.7 kHz for 896-940M to determine if the test passed or

failed.

• The second (and faster) method is the “set and measure” test where test 28 is set to “1”.

In this case, microphone sensitivity is measured by setting the microphone voltage half-

way between the limits set by Pass/Fail Limit 24, TX Audio Frequency Response

Roll >2.7 kHz for 896-940M . The measured system deviation is reported in the test

results and compared to Pass/Fail Limit 22, TX Audio Frequency Response Roll

>2.3 kHz for 896-940M to determine if the test passed or failed.

Pass/Fail Limits Used

Pass/Fail Limit 28, TX Deviation If Set and Measure Mic Sens

Pass/Fail Limit 31, TX Microphone Sensitivity

Test Parameters Used

Parameter 2, RT Full Rated System Deviation

Parameter 29, TX Mic Sens Set and Measure