(5) The LIGHT switch lights the FREQUENCY KHZ display when
(6) The AUDIO connector (upper) is for the connection of the
handset for voice operation, CW key/handset or data input.
(7)The PTT switch is located on the handset. When pressed, it starts
the automatic fine tuning to selected frequency and keys the
b. Having covered the first major component, the receiver-
transmitter RT-1209, you will now learn the amplifier-converter AM-
6879, which is the next major component of the AN/GRC-193.
amplifier-converter has two separate functions.
It contains an FSK
converter that converts received FSK signals to TTY signals to
operate the teletype.
During transmission, it converts the signals
generated by the teletype to FSK audio signals.
(2) All controls and indicators for the amplifier-converter are
on the front panel.
The connections for the RF signal, power, and
control cables are made on the back (Fig 3).