3-3
3.6
INSTALLATION - PIN LOCATIONS AND CONNECTIONS (continued)
TFM-138 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 TFM-138
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.
Summary of Contents for TFM-138
Page 13: ...2 2 FIGURE 2 1 Operator s Switches and Controls TFM 138 F10 B software...
Page 24: ...3 2 FIGURE 3 1 Outline Drawing for Model TFM 138 Transceiver...
Page 26: ...3 4 Figure 3 2 Wiring Connections for TFM 138 Transceiver...
Page 30: ...3 8 FIGURE 3 4 Microphone and Sidetone Level Main and Guard Squelch Adjustment Access Holes...
Page 42: ...STEP SYSTEM PASS FAIL NOTES A 11...
