Today's Message Index:
----------------------
1. 01:07 AM - Re: GPS antennae siting (Ivor Phillips)
2. 01:52 AM - Re: GPS antennae siting (Richard Scanlan)
3. 03:15 AM - Re: GPS antennae siting (Ivor Phillips)
4. 02:24 PM - Re: GPS antennae siting (Duncan & Ami McFadyean)
5. 04:21 PM - off topic - things to come (Fred Klein)
Message 1
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Subject: | GPS antennae siting |
David
You are correct about locating the aerials above your head for best
reception; IMHO two people would block most of the signals from the
rear if the aerial is sited in the instrument panel,
As far as the Garmin 295 and the skymaps are concerned the 295 can lock
onto 12 satellites and the skymaps only eight, that was Until two years
ago when Honeywell improved there receiver, they now also can use 12,
. 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
regards
Ivor
Message 2
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Subject: | GPS antennae siting |
I take it that anyone who has mounted their aerial overhead has mounted
it somewhere between the forward door hinges and in the small void
between the ceiling close out panel and outer skin? I take it that the
aerial (496) can 'see' OK through the thickness of the fuselage skin?
Richard Scanlan
# 103, just started wiring with upholstery to go.
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Ivor
Phillips
Sent: 06 February 2008 09:01
Subject: RE: Europa-List: GPS antennae siting
<ivor.phillips@ntlworld.com>
David
You are correct about locating the aerials above your head for best
reception; IMHO two people would block most of the signals from the
rear if the aerial is sited in the instrument panel,
As far as the Garmin 295 and the skymaps are concerned the 295 can lock
onto 12 satellites and the skymaps only eight, that was Until two years
ago when Honeywell improved there receiver, they now also can use 12,
. 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
regards
Ivor
Message 3
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Subject: | GPS antennae siting |
Both of my aerials for Garmin and Honeywell are mounted there, they have
no trouble tracking the satellites even in the garage,
I take it that anyone who has mounted their aerial overhead has mounted
it somewhere between the forward door hinges and in the small void
between the ceiling close out panel and outer skin? I take it that the
aerial (496) can 'see' OK through the thickness of the fuselage skin?
Richard Scanlan
# 103, just started wiring with upholstery to go.
Regards
Ivor
Message 4
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Subject: | Re: GPS antennae siting |
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
>>
>>
>
>
>
Message 5
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Subject: | off topic - things to come |
There's a hydrogen (fuel cell; no combustion) powered ducted fan in our
future...zero carbon footprint...we live in interesting times.
Fred
'The HyFish is only possible as an unmanned aircraft right now,'
explains Koni Schafroth, who runs the project's Swiss design company
Smartfish. 'The hydrogen cell technology is probably unable to support
commercial flight by itself, although it could be used for drones and
spotter planes. You could combine the cell power with conventional
flight technology to create a two-man aircraft that should use less
fuel than a car while still reaching around 900km per hour,' he adds.
'And that is what we are developing at the moment.'
(excerpt from:
www.wallpaper.com/technology/hyfish-hydrogenpowered-jet/1831)
watch the video at: www.horizonfuelcell.com/UAV.htm
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