Carrier 38TXA Guide Guide de l'utilisateur télécharger pdf (Page 44)

44 Chapter 2

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Test Descriptions

TEST_17 - RXA Hum and Noise

Description

This test measures the ratio, expressed in dB, of:

• The residual audio output in the absence of modulation,

• To the rated audio output.

NOTE

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

test.

•A

−50 dBm RF signal is applied to the receiver’s antenna.

•The

−50 dBm RF signal is modulated to deviate to 8 kHz at a 1 kHz

rate with a SAT tone present.

• The SAT tone is always on during this test.

• Narrow analog operation uses 3 kHz deviation and DSAT.

Pass/Fail Limits Used

• 7. RXA 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)

• 31. RXA Set Audio Lvl [0=no xx=level volts]

• 32. RXA Tolerance for Setting Audio Level (% error)

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

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Carrier 38TXA Guide Guide de l'utilisateur Page 44