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R-392 Connections

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
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