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Chapter 2 29

Test Descriptions

TEST_09 - TXA FM Hum and Noise

Description

This test measures the ratio of residual frequency modulation to the

standard test modulation.

NOTE

Audio connections from the radio to the test system are required for this

test.

The test system does not have expandor circuitry. If your testing

conditions require correction for this situation, you must change the

limits set in the pass/fail limit 19. TXA FM Hum and Noise (dB), as

required.

FM hum and noise is expressed in dB, from the formula:

−20 × Log (Reference Deviation ÷ Present Deviation)

CAUTION

An open microphone on your MSUT can affect the results of this test. If

your MSUT has an open microphone, this test must be performed in a

quiet environment.

Pass/Fail Limits Used

• 19. TXA FM Hum and Noise (dB)

Parameters Used

• 1. CPA Control Channel [1-799 or 991 -1023]

• 2. CPA DSAT Vector

• 3. CPA Enter Ph# [0=If Needed,1=Always,Here]

• 4. CPA MIN From? [0=RECC,1=All 0’s,2=Phone #]

• 5. CPA Prt RECC RVC Data [0=no 1=yes 2=fail]

• 6. CPA SAT Tone (Hz)

• 14. RC Compandor is Always On [0=no 1=yes]

• 22. RX RF Level for Signaling (dBm)

• 49. TXA TS Atten for Signaling [0, 20, 40] (dB)

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Carrier 38TXA Guide Guía de usuario Pagina 29