So, you are getting a reply light both on the ground and in the air, yet
radar facilities can't "see" you?
What else is in the vicinity of the transponder antenna? Anything metal
(other than the ground plane) within a foot may block, absorb, reflect or
otherwise distort the output of the transponder antenna. I'd have the
installation checked out by a technician with a transponder test rig. There
may be an avionics shop or specialist in your area who can do this for you
fairly inexpensively.
Best Regards,
Larry Graves
AirCrafters Builder Education Center
140 Aviation Way, Watsonville, CA 95076
Tel: 831-722-9141 Fax: 831-722-9142
Website: www.AirCraftersLLC.com
----- Original Message -----
From: "Ben" <sales@fernhurst-tvr.co.uk>
Subject: Transponders
Another one for an avionics whizz!! I have a King KT 96 transponder. The
set has been checked out on the bench and pronounced OK. When powered up it
warms up normally and then the ident and test settings have the usual
effect(constant light). However both on the ground and in the air on "norm"
or "alt" the ident light flashes erratically (but on average about 40 times
a minute). Once airborne ground radars report "no signal" . The aeriel is
a brand new rod type with an 8" ally disc as a ground plane. I have double
checked continuity of the coax screen and of the conductor and checked for
shorting between the two. All appears ok. If the aeriel is diconnected all
the flashing ceases. Any helpful suggestions???
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