That's pretty-much where I put my Tx aerial too (i.e. mounted externally on
the belly). Although one could argue that the water radiator blocks its
forward "vision", this doesn't seem to be a problem.
However, on one occasion the received signal was "dropping out" in a
direction at right angles to the a/c longitudinal axis. This might have been
due to the presence of the CF legs of the fixed TD undercarriage. This would
be comparable to the tri gear steel legs. So, the aerial location may not be
fool-proof for this type of undercarriage.
Duncan McF.
----- Original Message -----
From: "Terry Seaver (terrys)" <terrys@cisco.com>
Subject: RE: Europa-List: Transponder antenna
<terrys@cisco.com>
>
> The glass is transparent, but the engine, firewall, instrument panel,
> etc. aren't. If you assume the radar is dead ahead of you, mounting the
> xponder antenna directly behind all that may hide it from the intended
> audience. We mounted ours under the belly, just behind the wheel, with
> the assumption that it would be visible to the destination airport's
> radar.
>
> Regards,
> Terry Seaver
> A135 / N135TD
>
>
> -----Original Message-----
> From: owner-europa-list-server@matronics.com
> [mailto:owner-europa-list-server@matronics.com] On Behalf Of Gilles
> Thesee
> To: europa-list@matronics.com
> Subject: Re: Europa-List: Transponder antenna
>
> --> <Gilles.Thesee@ac-grenoble.fr>
>
> M@nsfield a crit :
>
> >Anybody know why I shouldn't mount the stub antenna internally (glass
> >is transparent, isn't it?) behind the baggage bay, without being too
> >far from the xpdr unit and without degrading the signal significantly?
> >
> >
> Paul,
>
> We hid a TED stub antenna, $ 20 in the lower rear fairing (MCR 4S).
> RG 400 coax. Works wonderfully.
> See http://gilles.thesee.free.fr/Ant_XPDR.htm
> You can hide your COM/NAV/XPDR antennas provided the skin is not
> conductive.
>
> The antenna is available at
> See http://www.aircraftspruce.com/catalog/avpages/ted_transponder.php
>
> Hope this helps,
> Regards,
>
> Gilles Thesee
> Grenoble, France
>
>
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