Carrier 38TXA Guide Guia do Utilizador descarregar pdf (Página 24)

24 Chapter 2

S:\agilent\83217\OPT001\BOOK\CHAPTERS\tdscrip.fm

Test Descriptions

TEST_06 - TXA Audio Frequency Response

Description

This test measures how closely the frequency deviation of the

transmitter follows a 6 dB/octave pre-emphasis slope over a given

frequency range. This test will check the audio response frequencies of

300 Hz to 3 kHz .

NOTE

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

test.

The test results indicate the flatness of the audio output as frequency is

varied. Audio frequency response is expressed in dB error from the

6 dB/octave pre-emphasis slope.

Background

• Audio frequency response is measured at 2.9 kHz peak deviation for

wide voice channels and 1.5 kHz peak deviation for narrow voice

channels.

• The frequency response measurement is made with the rms detector

and is made with respect to a 1 kHz reference rate.

Pass/Fail Limits Used

• 12. TXA Audio Response Dev from 6 dB/oct (dB)

• 13. TXA Audio Response Roll >2.5 kHz (dB/oct)

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Carrier 38TXA Guide Guia do Utilizador Página 24