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Bob's Searey LSX Web Site
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Date: 6-19-2023
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Number of Hours: 17.25
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Manual Reference: *Chapter 44
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Brief Description: Checking the VHF and Transponder
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With the antennae installed it was now time to check out the VHF radio and the transponder. Would they actually work?
First I had to install a small part in the back plate of the transponder cage called an RF adapter. This allows the coax cable to be plugged into the rack's back plate. Then the transponder itself slides back in the rack and engages with the antennae (and the D-sub connector for the other wiring). Simple enough. Time to turn on the power.
Well, the transponder powered up. I was reluctant to fool around with it in case I drove some air traffic controller somewhere crazy. Let's just assume it works for now.
Similarily I powered up the VHF successfully. Tuning to the local airport frequency, and using both the pilot and co-pilot headsets, I could hear some local traffic. Wonderful!
Two out of three ain't bad, eh?
Feelings of success left me when I realized that the VHF wasn't transmitting. The red transmit button would come on when I squeezed the joystick trigger switch, but it was obvious after a few calls of "Radio Check" and no responses (also from listening in on the flying club's base radio) that I wasn't broadcasting. Darn!
Many hours were then spent checking wiring diagrams for the radio, for the headsets, for the joystick switches, and for the wiring harness to no avail. There is not a clear correlation between the wiring harness diagram and the radio which makes things very difficult, especially for a novice like me, to figure out.
Another problem for another day...
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RF Adapter in transponder rack backplate
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