Noise Mute Adjustment; Rssi; Carrier Level Mute - Tait T880 II Series Adjustment Manual

B3.12 T885 Initial Tuning & Adjustment
3.9

Noise Mute Adjustment

Connect pins 1 & 2 of PL250 to enable the noise mute.
Align the receiver as instructed in
Set the RF level to -105dBm with ±3kHz deviation [±1.5kHz] at 1kHz.
Set RV230 (front panel gating sensitivity) fully anticlockwise.
Adjust RV346 (noise mute gain) fully anticlockwise to close the mute (if necessary
turn off the RF signal and then turn it on again).
Rotate RV346 clockwise until the mute just opens.
Reset the signal generator for the required opening sinad and adjust RV230 clock-
wise until the mute just opens.
3.10

RSSI

Align the receiver as instructed in
Apply an on-channel signal from the RF generator at a level of -110dBm with
±3kHz deviation [±1.5kHz] at 1kHz.
Adjust RV345 (RSSI level) to give 2.0V RSSI output on pin 5 of D-range 1 (PL100)
when measured with a high impedance DMM.
3.11

Carrier Level Mute

Connect pins 2 & 3 of PL250 to enable the carrier mute and disable the noise mute.
Apply an on-channel signal from the RF generator at the required mute opening
level with ±3kHz deviation [±1.5kHz] at ±1kHz.
Adjust RV235 (carrier mute) anticlockwise to close the mute (if necessary, momen-
tarily turn off the RF), then slowly adjust it clockwise until the mute just opens.
The mute should now open at this preset level.
10/07/00
Section 3.6 and Section
Section 3.6 and Section
M880-00
3.7.
3.7.
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