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Chapter 2 45

Test Descriptions

TEST_18 - RXA SINAD

Description

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

• Signal + Noise + Distortion,

• to Noise + Distortion.

The receiver’s SINAD is measured at the RF level specified by

parameter 29. RXA RF Level for SINAD (dBm).

NOTE

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

test.

Receiver SINAD is measured at the receiver’s audio output. This

measurement differs from a distortion measurement in that it is

conducted at low RF input levels where the noise contribution is

significant.

This test is intended to measure receiver sensitivity. Receivers are

typically required to provide at least 12 dB SINAD (less than 25% noise

and distortion) for RF input levels below 1 microvolt.

• The RF signal (level set by the parameter 29. RXA RF Level for

SINAD (dBm) is modulated to deviate to 8 kHz at a 1 kHz rate with

a SAT tone present.

• The measurement is repeated at high and low supply voltages if

parameter 20. RT Test at Extreme Settings [0=no 1=yes] is set to 1.

• Narrow analog operation uses 3 kHz deviation and DSAT.

Pass/Fail Limits Used

• 10. RXA SINAD (dB)

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Carrier 38TXA Guide Betriebsanweisung Seite 45