Item 6: Sat Deviation - Ericsson EF738 Service Instructions Manual

Hide thumbs Also See for EF738:

Table of Contents

Service Instructions

Item 6: SAT Deviation

Purpose:

Checking and, if necessary, calibrating the SAT (Supervisor Audio Tone) deviation

of the transmitter

Test method:

Radio test set in TX mode

Input signal:

None

Measurement point:

At the antenna connector measured with a deviation meter

Limit:

±1.7kHz ±0.5dB (1.60 - 1.80 kHz)

Procedure:

1. Mute the TX audio path (TP-20:0)

2. Activate the SAT-tone (TP-22:1)

3. Unmute the TX SAT path (TP-22:4)

4. Turn the transmitter on (TP-2:2)

5. Monitor the SAT deviation

6. If the deviation is outside the limits; adjust the deviation

7. Enter TP-22

8. Start the trimming by pressing M + #

9. Trim SAT deviation to 1.60 - 1.80 kHz by pressing # and * to increase/decrease

10.Press M + S to store the value

the deviation

Allowed trim values are 2 to 29

Trim step size is 0.3dB per step

Table of Contents