mikem wrote:
Lost Mode C and Transponder reply while in Class B airspace the other
day. After landing, was looking at all of the simple obvious things,
like transponder not seated in tray etc. Little voice told me
to look at the antenna, too.

Seems the whip broke at the base and just fell off. It is mounted on the
bottom of the boot cowl just aft of the firewall on the PA22/20, and
probably gets subjected to some buffeting from the propellor pressure
pulses.

Mounting a new one further back from the propellor might be better, but
that would put it closer to the landing gear legs. Alternatively, it
would have to go all the way back to mid fuselage where there is a
16x16" metal access plate for the elavator trim jackscrew. The strobe is
mounted on this plate. Otherwise the fuselage is covered with fabric.

Any ideas?

MikeM
Pacer '00Z

Go to an avionics shop that knows how to properly install a metal backing
plate in a fabric aircraft.

Ask how much to replace the existing antenna and how much to move it back.

--
Jim Pennino

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