Technical data

102 S:\hp11807a\OPT001\USRGUIDE\BOOK\chapters\descrptn.fb

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

TEST_12. RX Audio Distortion

This test measures audio distortion from the receiver when a standard RF signal

(test

Parameter 15, RX Squelch Preset Only) is applied to the radio. Distortion is

the voltage ratio, expressed as a percentage, of:

• the rms value of the sum of the second and higher harmonic components,

• to the rms value of the complete signal at the output.

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

If your radio has Continuous Tone-Controlled Squelch System (CTCSS) or

Continuous Digital-Controlled Squelch System (CDCSS) available but is not

controllable, an alternate filter may be selected, if available, to reduce the effect of

the tone or code on the result. A 400 Hz HPF, C MESSAGE, or CCITT filter may

be selected.

Pass/Fail Limits Used

Pass/Fail Limit 1, RX Audio Distn 17 dB Below Rated Power

Pass/Fail Limit 2, RX Audio Distortion

Test Parameters Used

Parameter 11, RX Maximum Audio Power

Parameter 16, RX Standard RF Input Level

Parameter 17, RX Tolerance for Setting Volume

Testing Conditions Defined by the Software

• Receiver distortion is measured at two volume settings and at a 1 kHz rate.