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3 TRANSMITTER I/O CONNECTIONS
3
Tr ansmitter 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
DC power
Channel Select
RS232 Data
600Ω Line
150Ω / Hybrid
Direct PTT input
T/R Relay driver output
Sub-Audible Tone Input
High-Z Audio Input
External ALC input
Table 3:
connector.
3.2
Rear Panel Connector s
The exciter and receiver can be supplied with optional rear panel connectors that bring
out the more important signals available on P1, the rear panel DB25 connector.
Figures 1 and 2 show the rear panel connectors, and Table 4 shows the signals that are
brought out onto spade connectors for these daughter boards.
(2.1 x 0.6 x 7mm) are captive/soldered at the labelled points.
RF Technology T220
Signal
+12 Vdc
0 Vdc
1
2
4
8
10
20
40
80
In
Out
High
Low
Tone+
Tone-
HiZ+
HiZ-
Pin connections and explanations for the main 25-pin, D
3.1 25 Pin Connector
Pins
Specification
1, 14
+11.4 to 16 Vdc
13, 25
21
BCD Coded
9
0 = Open Circuit
22
or 0 Vdc
10
23
1 = +5 to +16 Vdc
11
24
12
15
Test and Programming use
2
9600, 8 data 2 stop bits
20
Transformer Isolated
6
Balanced 0dBm Output
7
19
3
Ground to key PTT
16
Open collector, 250m /30V
5
>10kΩ, AC coupled
18
(1-250Hz)
4
>10kΩ, AC coupled
17
(10Hz-3kHz)
8
<0.5V/1mA to obtain
>30dB attenuation, O/C
for maximum power
The spade connectors
Page 11
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