Loss of Mode C and Transponder Reply

mikem wrote:


wrote:

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

My AI and I installed a backing plate under the TXP antenna about a year
ago. Prior to this, it was mounted only through the (very thin) aluminum
boot cowl, and was very flexible. I'm guessing that adding the backing
plate stiffened the mount to where the whip now hits some vibration
modes excited by the propellor pulses...

Could well be. Better to fatigue off a cheap antenna than a chunk of the
cowl though.

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

No expertise with fabric aircraft at any local avionics shop. The
replacement antenna TED 12-10 can be had from Spruce for $20, Chief for
$23, and eBay for $15+

That's not really surprising. Back in the early 70's when I worked in an
avionics shop and fabric aircraft were a lot more common, we only did one
or two a year if you didn't count the Maules which had metal in the
right place already.

Anyway, I think you answered your own question; $20 now and then is a lot
cheaper than finding someone with the expertise to mount it on the belly.

You could mount it inside the fabric, but that would probably be even
more expensive and problematic.

--
Jim Pennino

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