TECHNISONIC INDUSTRIES LIMITED
www.til.ca
TDFM-136A Installation Instructions
Page 2-4
TiL 09RE404 Rev C Issue 1
2.7
WIRING INSTRUCTIONS – 15-PIN D-CONNECTOR
Figure 2-3 shows all required connections and recommended wire sizes for the TDFM-136A
Transceiver operation in the airframe.
2.7.1
Main Power +28 VDC
The main power +28VDC (± 15%) is connected to pins 7 and 14 of the 15-pin D-connector on the
transceiver. Both pins should be connected.
2.7.2 Main
Ground
Ground connections for the transceiver are made on pins 8 and 15. Both pins should be
connected.
2.7.3
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.
2.7.4
Front Panel Back Lighting
Front panel back lighting connection should be made on pin 3 of the transceiver. The opposite
end of this lead should be connected to the panel lighting system of the aircraft. Before
connecting, verify the required panel lighting voltage (28 VDC or 5 VAC) on the transceiver
configuration control label.
2.7.5
Audio Outputs (600 Ohms and 4 Ohms)
The audio output from pin 9 can be used to drive a 4 ohm speaker up to 2.5 watts. Audio output
from pin 1 is 600 Ohms, 0.5 watts maximum.
2.7.6 Audio Output Ground
Pin 10 is the ground for both the 4 and 600 Ohms audio output signals on pins 9 and 1.
2.7.7 Mic Signal Input
The microphone input signal is to be provided on pin 6, utilizing shielded wire with the shield
grounded to pin 10.
2.7.8 Memory Up/Memory Down
Remote scrolling through the 25 memory positions can be achieved by providing a ground to pins
4 (up) and 5 (down) through a momentary contact cyclic switch.
2.7.9 Data Input
Channel data may be transferred to and from the unit using RS-232 communications protocol via
pins 2 and 11.
