User's Manual Chapter 5

5.l.l2 RX Line Output Level Adjustment
The fourth potentiometer sets the RX Line output level.
Procedure
i) Disable the repeater (switch SW4/DIP2 OFF).
ii) Using a 600ohm termination monitor RX line output level. Tl•is output is located
on the rear of the MX800, on the Line I/O connector pin 9 of the DBI 5F.
iii) Set the receiver modulation frequency to I kHz and the FM deviation to nominal
for the particular RF receive frequency of the test channel.
iv) Adjust Line Output level RV5 to obtain nominal line output level (-10dBm is the
default level).
5.1.12.TX VF Loop Back Level
Under control of the TX VF Loopback Control line (LIFUSEN) the TX line input may be
looped back to the RX Line output. The fifth potentiometer sets the loop-back level.
Procedure
Enable the TX VF loopback using JMP9.
Set the transmitter modulation frequency to lkHz, -10dBm, injected in through
the TX VF input.
Adjust RV7 to obtain a RX Line output level of-10dBm.
Resore JMP9
5.1.13.Mute Threshold Setting
The Mute Threshold Setting is used to set the level at which the mute opens.