User's Manual

11 RX MON-This input breaks the squelch (unmutes) on the receiver i.e. allows for
monitoring the channel even when a signal not strong enough to break squelch is
present. Input levels are TTL/CMOS; polarity may be programmed. Internal 10
k pull-up to +5 volts.
12 AUDIO OUT-This is the output of the audio power amplifier. This output can
drive up to 100 milliwatts into an 8 ohm load. The output level can be controlled
by programming. De-emphasis can be applied to this output, but not
independently of the AUX OUT output. Note that this output level varies with the
adjustment via the programmer of the AUX OUT level. Thus, the AUX OUT level
should be set first before adjusting the AUDIO OUT level.
13 DCD-Carrier detect output. This output becomes asserted when a signal strong
enough to exceed the programmed squelch threshold is present. This output is
not affected by the RX MON input. The polarity can be programmed. The output
is active low 5 volt logic with an internal 10 k pull-up to +5 volts. It can source
up to 10 mA when low.
14 PTT/RTS-Push to Talk/Request to Send. This input commands the unit to
transmit. Input levels are TTL/CMOS; polarity may be programmed. Internal 10
k pull-up to +5 volts.
15 GND-System ground. All signals and voltages are referenced to this input. The
negative side of the power supply should connect here.
4 ACCESSORIES
Note: Programming kits are for use by authorized service/maintenance personnel only.
The Programming Kit for DTX Plus radios (via compatible computer) is model DTXP2-PCPK-1. It
includes:
1) Programming Software CD, DTXP2-PCPS-1.
2) 1 25 pin PC to 6 pin modular adapter cable with built-in interface circuitry, 9/RTC-PAS.
3) 1 modular adapter to DB-15 connector cable with power cable, DTXP-PAC.
4) 9-Pin to 25-Pin Adapter, 2147C001.
Factory programming of channels and features is also optional. Contact the factory for details.