Technisonic Industries Limited TFM-138, Инструкция по установке и эксплуатации

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A-4
B. Determine if the image frequency for the VHF Comm falls within the range of the TFM-138
series unit. If so, select a set of frequencies that will cause the TFM-138 unit 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-138
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-138 Transceiver to 142.8000 MHZ.
FREQUENCIES RESULTS
VHF #1 TFM-138 PASS FAIL
135.975 138.0000
121.150 157.5000
131.250 157.5000
Image:
FREQUENCIES RESULTS
VHF #2 TFM-138 PASS FAIL
135.975 138.0000
121.150 157.5000
131.250 157.5000
Image:
NOTES: