I have had periods of drop out from my Skymap, which on reflection have
mainly been North to South or South to North. Going North over the Lake
district and both North and South over the Pyrenees, both at over 4,000
feet, and both for periods of 10 minutes or more. The aerial is internal on
the coaming. This was with a my backup, a handheld Garmin Co- Pilot,
continuing to work as normal.
I also have a newer Skymap in my RV - anyone know how I find out how many
Satellites my 2006 Skymap 111c tracks?
Rick
Rick Morris Tri 912s G-RIKS
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Duncan & Ami
McFadyean
Sent: 09 January 2008 22:19
Subject: Re: Europa-List: GPS antennae siting
--> <ami@mcfadyean.freeserve.co.uk>
My experience is that I've never had a drop-out with the 12 channel receiver
(Garmin 195, installed with the integral antenna at the top of the panel).
The firewall also has spray-on RFI shielding.
Duncan McF.
----- Original Message -----
From: "Rob Housman" <rob@hyperion-ef.com>
Sent: Tuesday, February 05, 2008 11:40 PM
Subject: RE: Europa-List: GPS antennae siting
>
> With the GPS constellation's orbits inclined at 55 degrees from the
> equator
> those of us in the northern hemisphere will find the satellites generally
> toward the southern sky. This is much more significant in northern Europe
> (London 51 29' N, Paris 48 49' N, for example) where the satellites are
> near (or below) the southern horizon most of the time. I suspect that
> eastbound and westbound flights will get better reception than northbound
> and southbound flights if the antenna is within the panel since both the
> crew and the engine will tend to shadow the antenna.
>
> Can anyone confirm or refute this hypothesis from in-flight experience?
>
>
> Best regards,
>
> Rob Housman
> Irvine, CA
> Europa XS Tri-Gear
> A070
> Airframe complete
>
> -----Original Message-----
> From: owner-europa-list-server@matronics.com
> [mailto:owner-europa-list-server@matronics.com] On Behalf Of William
> Harrison
> Sent: Tuesday, February 05, 2008 2:43 PM
> To: europa-list@matronics.com
> Subject: Re: Europa-List: GPS antennae siting
>
> <willie.harrison@tinyonline.co.uk>
>
> Thanks, David and everyone. Presumably, as well as avoiding the
> shielding effect of the crew, antenna height relative to the engine
> and the metalwork in the panel itself would help comms with
> satellites close to the horizon.
>
> On our last French trip in October, (Paddy Clarke, Alasdair Milne,
> myself) we all lost GPS signal at various times as well. In addition,
> my "Old Faithful" 295 died peacefully (so peacefully that there was
> only a frozen display with no explicit warning that it was
> meaningless - charming).
>
> Cheers
>
> Willie
>
>
> On 5 Feb 2008, at 21:57, David Joyce wrote:
>
>> <davidjoyce@doctors.org.uk>
>>
>> Willie, It sounds from your replies that top of instrument panel
>> gives OK
>> results, but I wonder whether the fuselage top between your doors
>> may give
>> even better results, as I can imagine that pilot and passenger will
>> blank
>> some satellites for a panel aerial in some situations. Everyone I
>> have flown
>> with on the trips I have done in Italy have lost GPS signal at
>> some point,
>> but I never did. I had tended to put this down to superior
>> performance of my
>> Garmin 295 as opposed to most people's Skymaps, but it may be
>> because I have
>> my aerial above head level. The cable supplied by Garmin and by Blue
>> Mountain is plenty long enough to reach there, and otherwise gets
>> coiled up
>> behind the panel where it could possibly be subject to electronic
>> interference. Regards, David
>>
>>
>
>
>
09:13
20:14
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