User's Manual

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.