Audio Processor; Line Amplifier Output; Monitor Amplifier Output (Speaker Output); Ctcss - Tait T880 II Series Adjustment Manual

M880-00
3.12

Audio Processor

3.12.1

Line Amplifier Output

Apply an on-channel signal from the RF generator at a level of -70dBm with
±3kHz deviation [±1.5kHz] at 1kHz.
Adjust RV210 (front panel line level) to give an output of +10dBm on the 600 ohm
line.
Check for any clipping or distortion on the oscilloscope.
Set the line level to the required output level.
3.12.2

Monitor Amplifier Output (Speaker Output)

Adjust RV205 (front panel monitor volume) to give an output of 2V rms into a 4
ohm resistive load.
Check for any clipping or distortion on the oscilloscope.
Switch to a 4 ohm speaker and adjust RV205 to the required level.
3.13

CTCSS

3.13.1

Decoder Operation

Program a CTCSS tone on the default channel using PGM800Win.
Set the RF signal generator output to -70dBm.
Modulate the generator with both:
• a 1kHz tone at ±3kHz deviation [±1.5kHz]
• and a CTCSS tone at the programmed frequency at ±500Hz deviation [±300Hz].
Check that the receiver gate opens and the front panel "Gate" LED is on.
3.13.2

Opening Sinad

Adjust RV230 (front panel gating sensitivity) fully clockwise.
Reduce the RF signal level to -110dBm.
Copyright TEL
T885 Initial Tuning & Adjustment B3.13
10/07/00