I have a stick aerial for my panel-mounted Skymap which is mounted to the left
of the 'shelf' in front of the RH seat, on the vertical part of the instrument
panel. The aerial is about half way back from the front of the instrument panel
to the back side(firewall side). In this position it is pretty close to various
electronics (eg radios, transponders etc) but as yet I've had no problem
at all with this position.
However, make sure that any non-aviator passengers realises that the aerial is
NOT there to be used as a convenient grab handle when getting in!
David
GBWJH
Trigear Classic
-----Original Message-----
Subject: Re: Fwd: Remote GPS antenna
irampil@notes.cc.sunysb.edu wrote:
>
> Hi All,
> ...
> I am building it into the roof of the instrument module itself
> as I see no particular reason to string it into the rear of the
> fuselage. Is there any evidence, or anecdote that the GPS
> needs to be remote? I have tested it with two stainless plates
> approximating
> my through the firewall access panels, but have not put the panel
> with the antenna in the fuse yet.
The explanation for any such anecdotes would have to be proximity to
noise sources, avionics and spinning motors. GPS receiver sensitivity
is typically -135 dBm, like around 20 times more sensitive than any
other receiver in an aircraft. Plus another bad phenomenon where the
noise source is underneath the antenna. It is also a function of the
square of the distance - inversely, so mere inches count. I'd like to
try mounting it in the space inside the right side "shelf." There
would be some blockage of a satellite down toward 30-deg from the
horizon off the left side, and fwd thru the prop, but years of GPS
navigating seems to conclude that those sats - which GPS wants for
best 3-D, leaving 2-D working just fine, are practically useless (if
an altimeter is installed!). But still near to ignition noise
though. Has anyone tried that?
Regards,
Fred F.
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