Ramsey Electronics SG560 Betriebsanweisung PDF herunterladen (Seite 42)

TYPICAL TEST PROCEDURES

3.20.02 SINAD Measurements

This test allows the user to accurately measure the sensitivity of a receiver with a built-in SI-

NAD Test Set. The SINAD meter is accessed using the SHIFT, 8 buttons. The following is a

step-by-step SINAD test procedure for testing the sensitivity of a radio.

1. Connect the radio’s antenna to the RF OUT jack.

2. Connect the audio out of the radio to the MOD IN of the COM3010.

3. Set the receiver’s volume control to approximately mid-point (a fine adjustment will be

made later).

4. Set the COM3010’s Generate Frequency to the frequency of the receiver to be tested.

Example: 464.55 MHz.

5. Set the output of the Generator to a level slightly greater than the expected sensitivity of

the receiver under test. In this example, 2.2 uV (-100 dBm).

6. Enter the required step size for accurately finding the 12dB SINAD of the radio. In this

example we’ll use 0.1 uV steps.

7. Set the FM Deviation to 60% of the maximum allowable signal for the band. Example:

For the 5 kHz band set the COM3010’s deviation for 3 kHz (5000 * 0.6 = 3000).

8. Select SHIFT, 8 for the 1kHz SINAD test, or SHIFT, 9 for the 400Hz SINAD test.

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Ramsey Electronics SG560 Betriebsanweisung Seite 42