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RF Technology T70/T150 Page 9

3 TRANSMITTER I/O CONNECTIONS

rear connector and the audio input signal is via the Line inputs on the standard DB25 rear panel

connector.

Condition Position

No DMTX board 1-2, 5-6*

DMTX board connected

2-3, 4-5

In addition to the jumper changes, a wire link or zero ohm resistor must be connected in the

place marked for R159.

3 Transmitter I/O Connections

3.1 25 Pin Connector

The D-shell 25 pin connector is the main interface to the transmitter. The pin

connections are described in table 3.

Function Signal Pins Specification

DC power +12 Vdc

0 Vdc

1, 14

13, 25

+11.4 to 16 Vdc

Ground

Channel Select 1

BCD Coded

0 = Open Circuit

or 0 Vdc

1 = +5 to +16 Vdc

RS232 Data In

Out

Test and Programming use

9600, 8 data 2 stop bits

600Ω Line

High

Low

Transformer Isolated

Balanced 0dBm Output

150Ω / Hybrid

Direct Digital Input “0”

“1”

1V (nominal)

Direct PTT input 3 Ground to key PTT

T/R Relay driver output 16 Open collector 250mA/30V

Sub-Audible Tone Input Tone [+] 5

>10kΩ, AC coupled

Tone [-] 18 (1-250Hz)

ALARM output +9.4Vdc

0V(flashing)

7 No alarm present

Alarm present

High-Z Audio Input HiZ [+] 4

>10kΩ, AC coupled

HiZ [-] 17 (10Hz-3kHz)

External ALC input 8 <0.5V/1mA to obtain

>30dB attenuation, O/C

for maximum power

Table 3: Pin connections and explanations for the main 25-pin, D connector.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 27 28

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