TECHNISONIC INDUSTRIES LIMITED
www.til.ca
TDFM-7300 Installation & Operating Instructions
TiL 08RE389 Rev A Issue 4
3-11
B.
Determine if the image frequency for the VHF Comm falls within the range of the TDFM-
7300. If so, select a set of frequencies that will cause the TDFM-7300 to be set as close as
possible to the image frequency. Any one of the many possible sets will suffice. Record
those values in the spaces provided in the following chart. Modulate the TDFM-7300
transmitter on the following frequencies for at least 20 seconds. Listen for any noise or
detected audio signals on the VHF comm.
Example - Bendix /King KY 196A:
The first IF frequency is 11.4 MHz. The L.O. is above the received frequency (high side
injection), therefore the image frequency is 22.8 MHz above the selected frequency. Set the
KY 196A to 120.000 MHz and the TDFM-7300 to 142.8000 MHz.
FREQUENCIES RESULTS
VHF #1
TDFM-7300
PASS
FAIL
135.975 136.0000
121.150 157.5000
131.250 157.5000
Image:
FREQUENCIES RESULTS
VHF #1
TDFM-7300
PASS
FAIL
135.975 136.0000
121.150 157.5000
131.250 157.5000
Image:
NOTES:
