TECHNISONIC INDUSTRIES LIMITED
www.til.ca
TFM-30 Installation & Operating Instructions
TiL 98RE244 Rev n/c Issue 9
3-5
3.8 WIRING INSTRUCTIONS – 9-Pin D-CONNECTOR
The 9-pin D-connector provides the necessary connections to facilitate the use of an
external Antenna Tuner Unit (ATU). Table 3-2 lists the signals and connections available
from the TFM-30. Refer to the Antenna Tuner instructions for specific wiring.
3.8.1 Power
Source
Pin 9 su28 volts and pin 7 provides a power and signal ground to the ATU.
3.8.2 Tune
Enable
Pin 5 activates the ATU during transmit. Active High (+28V).
3.8.3 Band
Select
Outputs
The 30 to 50 MHz band is broken up into 6 segments for ATU pre-tuning. The band select
outputs, pins 1,2,3,4 and 6, provide active low BCD signals corresponding to the band
segment in use. Refer to Table 3-3.
Band Select Output Truth Table
Band Segment
(MHz)
Pin 3
(4 MHz)
Pin 2
(8 MHz)
Pin 1
(10 MHz)
Pin 6
(20 MHz)
Pin 4
(40 MHz)
30
-
33.9975 1 1 0 0 1
34
-
37.9975 0 1 0 0 1
38
-
39.9975 1 0 0 0 1
40
-
43.9975 1 1 1 1 0
44
-
47.9975 0 1 1 1 0
48
–
50
1 0 1 1 0
* Note *
Band Select Outputs are active Low. High (1) =+12v Low (0) =0v
TABLE 3.3
Band Select Output Truth Table
