<<....if you mount the aerial near the occupants you will be
> subjecting yourself to continuous radiation .>>
<<>..If you are planning on fathering any children >>
I did and it doesn't!
Duncan McF.
----- Original Message -----
From: "Carl Pattinson" <carl@flyers.freeserve.co.uk>
Subject: Re: Europa-List: Transponder antenna
<carl@flyers.freeserve.co.uk>
>
> Just remember the antenna should have a ground plane (not sure of the
exact
> dimensions) but ours is about 12"" diameter, kitchen foil spray adhesived
to
> the fuaelage belly (near the tail end). Aerial was a sharksfin shape from
> Aircraft Spruce.
>
> Additionally, if you mount the aerial near the occupants you will be
> subjecting yourself to continuous radiation (unlike the comms radio which
> only transmits intermittently, the transponder transmits every second and
at
> a higher output wattage). If you are planning on fathering any children
this
> is something you should consider (on a metal A/C this dosent matter
because
> you are shielded but in a plastic A/C there is no shielding). In other
words
> it would be better to mount the aerial near the back end of the A/C. If
you
> do this however you will need to use lower loss (ie: larger diameter)
> coaxial cable).
>
>
> ----- Original Message -----
> From: "M@nsfield" <nsfield@screaming.net>
> To: <europa-list@matronics.com>
> Subject: Europa-List: Transponder antenna
>
>
> >
> > 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
> > Mono XS 383
> > CM etc in, top on next
> >
> >
> > Book yourself something to look forward to in 2005.
> > Cheap flights - http://www.tiscali.co.uk/travel/flights/
> > Bargain holidays - http://www.tiscali.co.uk/travel/holidays/
> >
> >
> >
>
>
|