User's Manual

SRM9000X8 800MHz SERVICE MANUAL
© TMC Radio 2008 page 49 TNM-M-E-0022 Issue 1
4.1.18
Mute DAC Adjustment
Note. This adjustment has default setting of 1000/2600 and should not need changing except for specific
requirements.
Calibration procedure
1
Select the
Mute/TCXO
page and select
Open Mute.
2 Set the RF signal generator to the receiver alignment frequency, and adjust the RF level such that the
desired mute opening SINAD (typically 10dB SINAD) is achieved.
3
Select
Close Mute
and remove the RF input from the radio
.
4
Set the
Squelch Open
and
Squelch Close
sliders to the fully left position. This ensures the receiver
will be muted.
5
Set the
Squelch Close
slider to the fully right position.
6 Reconnect the RF input to the radio.
7
Adjust the
Squelch Open
slider to the right until the mute opens.
8 Reduce the Signal Generator output level by approximately 2dB (or by an amount equal to the
desired mute hysteresis level).
9
Adjust the
Squelch Close
slider to the left until the mute closes.
10 The mute should now open and close at the desired RF levels.