Paul, I seem to remember that my Bob Archer cost relatively little - in fact
virtually nothing in the big scheme of things. It sits in the rear fuselage
in midline on the tail counterweight guide at floor level. In this position
it is looking ahead pretty much below the level of the engine and related
solid objects and has given totally reliable results for last 3 yrs,
including test flying a circle at 2000ft , 25 miles out to check continuous
radar visibility. Although it is radiating in the loose sense, it's not the
radioactive substance type which certainly fries gonads, but just the same
sort of radio wave radiation that emerges from the mobile phones that most
of the population keep glued to their ear for most of the day!
Regards, David Joyce, G-XSDJ----- Original Message -----
>
> Planning what transponder antenna to fit and where... I want to avoid
putting
> it exposed under the belly.
>
> My likely choice is a Microair T2000 and I would like not to have to
spring
> for a Bob Archer ($$$), but am told that the stub antenna must (should?)
> be mounted externally.
>
> I've read everything I can in the archives, and asked the UK supplier of
> the Microair, and still get several different answers.
>
> Jim Nelson wrote on 20 Jan 2004 "I mounted mine in the back on the pilots
> side. I mounted it vertical on three wooden rods which were reduxed to
the
> fuselage. Ran the coax up the pilots side just under the door jamb and on
> to the transponder. Seems to work fine. No interferance or noised
noted."
>
> This seems the logical answer, is this the stub (2.5"?) antenna & can you
> elaborate on the 3 wooden rod mount, please Jim?
>
> 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?
>
> Any other helpful, cheap, suggestions, please?
>
> Paul M
>
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