Download TFM-550 Installation and Operating Instructions

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B.
Determine if the image frequency for the VHF Comm falls within the range of the TFM-550.
If so, select a set of frequencies that will cause the TFM-550 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 TFM-550 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 TFM-550 to 142.8000 MHz.
(Note: Where indicated by an asterisk (*), required action is to switch ATC-550 on and off
as often as necessary.)
FREQUENCIES
VHF #1
TFM-550
118
34
118
45
135.975
138
121.15
157.5
131.25
157.5
128
RESULTS
PASS
FAIL
*
Image:
TFM-550 Installation & Operating Instructions
TiL 99RE262 Rev A Issue 9
A-3