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

Pass/Fail Limit 31, TX Microphone Sensitivity

This sets the pass/fail limits for testing a transmitter’s microphone sensitivity.

Microphone sensitivity is the nominal voltage measured at the input of the

microphone which will cause full-rated system deviation of the transmitter. The

value for full-rated system deviation is set by

Parameter 2, RT Full Rated System

Deviation

Pass/Fail limits are determined from an applicable radio specification or industry

standard, such as:

• Radio specification: Transmitter Audio Sensitivity

• Industry standard: EIA/TIA-603, Section 2.2.10, Acoustic Microphone Sensitivity

For Example:

If your radio specification defined the microphone sensitivity to be 100 mVrms

±10%, enter 90 in the lower-limit column and 110 in the upper-limit column.

Limits are entered in mVrms.

It’s Used in the Following Tests:

TEST_07. TX Microphone Sensitivity

TEST_21. TX Quick Test

This pass/fail limit is used as a reference value whenever transmitter deviation is

set during testing.