RF Technology T220 Operation And Maintenance Manual page 12

3.2 Rear Panel Connectors
Fig 1
RX PCB
The Receiver and Transmitter modules plug into the back plane DB25/F connectors
To configure: Solder wire connections between appropriate points.
Receiver RX
DB25/F PCB
1, 14 +12V
2 TXD
15 RXD
3 COR+
16 COR-
4 TONE
17 AUDIO
5 AGND
18 DISC
6 LINE+
20 LINE-
8 EXT SQ Ext Squelch input
13, 25 GND
21 BCD 1
9 BCD 2
22 BCD 4
10 BCD 8
23 BCD 10
11 BCD 20
24 BCD 40
12 BCD 80
Page 12
DESCRIPTION
+12V DC SUPPLY
TX Data
RX Data
Carrier Operate Sw+
Carrier Operate Sw-
Subtone output
Audio output
Audio Ground
Discriminator output
Line output+
Line output-
Ground, 0V
Channel select 1's digit
Channel select 1's digit
Channel select 1's digit
Channel select 1's digit
Channel select 10's digit
Channel select 10's digit
Channel select 10's digit
Channel select 10's digit
Table 4
3 TRANSMITTER I/O CONNECTIONS
PressToTalk input
Tx/Rx output
Hi Z audio input+
Hi Z audio input-
Ext tone input+
Ext tone input-
Line input+
Line input-
Auto Level Control
RF Technology T220
Fig 2
TX PCB
TX Tr ansmitter
PCB DB25/F
+12V 1, 14
TXD 2
RXD 15
PTT 3
T/R 16
AUD+ 4
AUD- 17
TONE+ 5
TONE- 18
LINE+ 6
LINE- 20
ALC 8
GND 13, 25
BCD 1 21
BCD 2 9
BCD 4 22
BCD 8 10
BCD 10 23
BCD 20 11
BCD 40 24
BCD 80 12