---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Wed 02/06/08: 5 ---------------------------------------------------------- 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 _____________________________________ Time: 01:07:32 AM PST US From: "Ivor Phillips" Subject: RE: Europa-List: 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 _____________________________________ Time: 01:52:40 AM PST US From: "Richard Scanlan" Subject: RE: Europa-List: 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 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 _____________________________________ Time: 03:15:11 AM PST US From: "Ivor Phillips" Subject: RE: Europa-List: 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 _____________________________________ Time: 02:24:30 PM PST US From: "Duncan & Ami McFadyean" Subject: Re: Europa-List: 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" 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 > > > > 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: > >> >> >> 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 _____________________________________ Time: 04:21:21 PM PST US Subject: Europa-List: off topic - things to come From: Fred Klein 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 -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.