User's Manual

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RF Technology T800 Page 10
3.1 25 Pin Connector 3 TRANSMITTER I/O CONNECTIONS
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
2
4
8
10
20
40
80
21
9
22
10
23
11
24
12
BCD Coded
0 = Open Circuit
or 0 Vdc
1 = +5 to +16 Vdc
RS232 Data In
Out
15
2
Test and Programming use
9600, 8 data 2 stop bits
600Ω Line
High
Low
20
6
Transformer Isolated
Balanced 0dBm Output
150Ω / Hybrid
7
19
Direct PTT input 3 Ground to key PTT
T/R Relay driver output 16 Open collector,250mA/30V
Sub-Audible Tone Input [+] 5
>10kΩ, AC coupled
[-] 18 (1-250Hz)
High-Z Audio Input [+] 4
>10kΩ, AC coupled
[-] 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.