R-392 Connectors

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.

 PinSignal                       Description
                                 This is the 600 ohm output from the
 A  AF output                    receiver and is the same as pin L and
                                 J103 pin H.
 B  Ground
                                 This signal is not used by the receiver
 C  Microphone                   but is passed to the transmitter via J103
                                 pin C.
 D  No connection
 E  Ground
                                 This signal is not used by the receiver
 F  Push to talk switch on       but is passed to the transmitter via J103
    microphone or Key
                                 pin F.
 H  Ground
 J  No connection
                                 This signal is also available at J103 pin
 K  Carrier relay control        K and is grounded by the receiver when
                                 the audio output is not squelched.
                                 This is the 600 ohm output from the
 L  AF output                    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.
 PinSignal                      Description

 A  28 V B+ (Positive voltage)  This powers the tube plates. The current
                                requirement is 0.5 A.
                                This signal is provided by the transmitter
                                to engage relays in the receiver to
                                disable the audio output and antenna input
 B  Break-in relay control      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     This supplies the tube filaments and draws
    voltage)                    approximately 2.5 A.
 E  Ground

 F  Push to talk switch on      Passed to the transmitter from pin F on
    microphone or Key           the AUDIO connectors.
                                This is the 600 ohm audio output from the
 H  AF output                   receiver and is common with pins A and L
                                on the AUDIO connectors.
 J  No connection
                                This signal is also available at pin K on
 K  Carrier relay control       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 AJ103 pins A and D
 Ground      J103 pin E