Hi all,
I posted a similar note on the avionics list if anyone has some ideas please
contact
me. I have UPS SL70 mounted in my composite Europa. Up until recently it
has operated faultlessly, but I a recent trip between Wisconsin and Arkansas
I had several complaints from ATC that they could not see my transponder, even
at 9000'.
I am unsure if I have a problem or not, the antenna is mounted in the baggage
bay,
it is a simple "spike" type mounted on a piece of 6 x 6 aluminum. The cable
run is fairly short and it is RG400. I have reseated the transponder, the
connection to the coax and to the antenna and I can't spot any obvious problem.
During the times that ATC were complaining I was seeing a solid reply to there
integrations so the receiver seems to be working fine. I'd appreciate anyone's
input on things to check or trouble shooting ideas. I'd also like to know what
installations people have out there that are working fine. I am thinking
that maybe I have to mount the antenna on the belly of he aircraft with a ground
plane.
Thanks, Paul
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