The R-392 receiver has three multi-pin connectors on the
front panel. Two are for audio and
the third is for power and connection to the
companion T-195 transmitter.
The following charts describe the signals on each
connector pin.
J101 and J102 (AUDIO)
The two AUDIO connectors are wired identically--the
corresponding pins on each are wired in parallel to allow
either or both to be used with loudspeaker, headset,
and/or microphone.
| Pin |
Signal |
Description |
| A |
AF output |
This is the 600 ohm output from the receiver
and is the same as pin L and
J103 pin H. |
| B |
Ground |
| C |
Microphone |
This signal is not used by the receiver but
is passed to the transmitter via J103 pin C. |
| D |
No connection |
| E |
Ground |
| F |
Push to talk switch on microphone or Key |
This signal is
not used by the receiver but is passed to the transmitter via
J103 pin F. |
| H |
Ground |
| J |
No connection |
| K |
Carrier relay control |
This signal is also available at J103 pin K
and is grounded by the receiver when the audio output is not squelched. |
| L |
AF output |
This is the 600 ohm output from the receiver
and is the same as pin A and
J103 pin H. |
J103 (POWER INPUT - TRANS CONT)
The J103 connector is used to provide power to the R-392 receiver
and to provide control of the optional companion T-195 transmitter.
| Pin |
Signal |
Description |
| A |
28 V B+ (Positive voltage) |
This powers the tube plates. The current requirement is 0.5 A. |
| B |
Break-in relay control |
This signal is provided by the transmitter to engage relays in
the receiver to disable the audio output and antenna input when
transmitting. This signal is ignored when the receiver Function
switch is in the NET position to allow simultaneous use of the
transmitter and receiver. |
| C |
Microphone |
Provided to the transmitter from pin C on
the AUDIO connectors. |
| D |
28 V Filament (Positive voltage) |
This supplies the tube filaments and draws approximately 2.5 A. |
| E |
Ground |
| F |
Push to talk switch on microphone or Key |
Passed to the transmitter from pin F on the
AUDIO connectors. |
| H |
AF output |
This is the 600 ohm audio output from the receiver and is common
with pins A and L on the
AUDIO connectors. |
| J |
No connection |
| K |
Carrier relay control |
This signal is also available at pin K on
the AUDIO connector and is grounded by the receiver when the audio
output is not squelched. |
Standalone operation
When operating the R-392 receiver not connected to a T-195
transmitter supply power the receiver as follows.
| +28 V at 3 A |
J103 pins A and D |
| Ground |
J103 pin E |
|