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RTU-292C Operations Manual
2-13
2.9.2
RADIO CONNECTION
Connect the radio system to the RADIO J2 connector. The TX output and RX input are designed
to interface with 600 Ohm line connections at the radio, but the RTU-292C audio interface is
extremely flexible and can accommodate a wide variety of sources and loads. By making
different connections, the inputs and outputs may be configured for balanced or unbalanced lines.
The balanced configuration is the factory default and should be used if possible, because it is the
most noise-immune. To change to the receive audio to unbalanced, single-ended input, connect
the receive audio to RXA only and change jumper JP1 on the Main Board to UNBAL. To change
to the transmit audio to unbalanced, single-ended output, connect the transmit audio to TXA only
and change jumper JP3 on the Main Board to UNBAL. Figure 2-5and Figure 2-6details the
various audio interface options. P1 pin 4, the External Signal input, is used as the Squelch Break
input. Key Out A and Key Out B are normally floating, but pull to ground whenever the RTU-
292C wants to key the associated transmitter. The Remote Key Input may be pulled low to force
the RTU-292C to key the associated transmitter.
Table 2-17
P1-RADIO (DB-9 Male)
Pin
Function
1
Balanced Receive Audio Input B
2
Chassis Ground
3
Transmit Audio Output A
4
External Signal Input
5
/Key Output A (Relay Closure to Ground)
6
Receive Audio Input A
7
Transmit Audio Output B
8
/Remote Key Input
9
/Key Output B (Relay Closure to Ground)
2.9.3
HANDSET CONNECTOR
The handset supplied with the RTU-292C is plugged into front panel jack J7.
Table 2-18
J7 - HANDSET (RJ12C Jack)
Pin
Function
1
+5V Source
2
Ground
3
Ground
4
Earpiece Audio
5
Mic In
6
PTT Switch
Содержание RTU-292C
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