Instruction Manual

3-3
TDFM-136 Transceiver
15-Pin D Connections
Pin # Description
1 600 Ohm Output
2 Data Output
3 Panel Lighting (28VDC or 5VAC)
4 Memory UP/PC Download Input
5 Memory Down/PC Download Input
6 Mic Signal Input
7 Main Power +28VDC
8 Main Ground
9 4 ohm Speaker Output
10 4 ohm/600 ohm Output Ground
11 Data Input
12 PC Download Input
13 PTT (Ground Keying)
14 Main Power +28VDC
15 Main Ground
TABLE 3-1
3.7 WIRING INSTRUCTIONS
Figure 3-2 shows all required connections and recommended wire sizes for the TDFM-136
Transceiver.
3.7.1 Main Power +28VDC
The main power +28VDC (±15%) is connected to pins 7 and 14 of the transceiver. Both
pins should be connected.
3.7.2 Main Ground
Ground connections for the transceiver are made on pins 8 and 15. Both pins should be
connected.
3.7.3 PTT (Ground Keying)
The PTT line is connected to pin 13 and should be floating when the transceiver is in receive
mode, and grounded during transmit mode.