1. Set ONE WAY/DUPLEX switch at DUPLEX when test cable No. 3 is used.
2. Use extender cables for access to operational module for internal adjustments.
3. For adjustment of tty squelch adj A4A2R1, the input to AUX RCVR AUDIO J1 must be amplified 20 db. For
other A4 module adjustments, amplifier is optional. Amplifier should have following minimum characteristics:
Frequency response flat 100 to 3,500 Hz 0.5 db
Gain 20 db
Input level 200 mv rms into 600 ohms
Output level 2.45 v rms Into 600 ohms
Distortion less than 4%
4. The 600-ohm dummy load must be connected to J4A for 10 mw and to J4-L for 2 watt audio output