---------------------------------------------------------- RV10-List Digest Archive --- Total Messages Posted Fri 11/23/12: 19 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 12:08 AM - "Black Friday" For List Fund Raiser...? (Matt Dralle) 1. 07:04 AM - GPS mounting (Kelly McMullen) 2. 08:15 AM - Re: GPS mounting (Carl Froehlich) 3. 08:34 AM - Re: GPS mounting (Michael Kraus) 4. 09:24 AM - Re: GPS mounting (Seano) 5. 09:40 AM - Re: GPS mounting (Jay Rowe) 6. 10:41 AM - Spinner Back Plate Hardware (Sean Stephens) 7. 10:43 AM - Re: GPS mounting (Jim Berry) 8. 10:46 AM - Re: Spinner Back Plate Hardware (Sean Stephens) 9. 11:08 AM - Re: GPS mounting (Carl Froehlich) 10. 12:34 PM - Re: GPS mounting (Kelly McMullen) 11. 01:07 PM - Re: Re: Spinner Back Plate Hardware (Kelly McMullen) 12. 01:08 PM - Re: GPS mounting (Kelly McMullen) 13. 01:27 PM - Re: Spinner Back Plate Hardware (Bob Turner) 14. 01:39 PM - Re: GPS mounting (Bob Turner) 15. 03:18 PM - test (cloudvalley@comcast.net) 16. 04:47 PM - Re: Re: GPS mounting (Kelly McMullen) 17. 04:48 PM - Re: Re: GPS mounting (Seano) 18. 05:41 PM - Re: Re: GPS mounting (Dave Saylor) ________________________________ Message 0 _____________________________________ Time: 12:08:44 AM PST US From: Matt Dralle Subject: RV10-List: "Black Friday" For List Fund Raiser...? Dear Listers, The number of List subscriptions are up by a fair amount this year, but support during this year's Fund Raiser is substantially behind last year, and there's only about a week left until the end of the Fund Raiser. I have always preferred a non-commercial List experience as many, many members have also expressed that they do as well. However, if the yearly fund raiser cannot generate sufficient funds to keep the bills paid, other sources of income might be required including some sort of advertising. Please don't let that happen! Your personal Contribution of $20 or $30 goes a long ways to keeping this operation a float. Please make sure your name is on this year's List of Contributors! The List Contribution site is secure, quick, and easy: http://www.matronics.com/contribution Or, drop a personal check in the mail to: Matt Dralle / Matronics 581 Jeannie Way Livermore CA 94550 Thank you in advance for your support! Matt Dralle Matronics Email List and Forum Administrator ________________________________ Message 1 _____________________________________ Time: 07:04:44 AM PST US Subject: RV10-List: GPS mounting From: Kelly McMullen I am thinking about mounting my Garmin GA-35 antenna on top of the cabin cover just behind the rear door post area where the roof gets thinner. The antenna calls for a ground plane. (first gps ant I've seen wanting one). I'm guessing I will need both thin metal/tin foil, and a grounding wire if I do that. Just wondering what others have done. I likely will put my Dynon GPS ant under the cowl just forward of the firewall, and it doesn't need ground plane. Kelly 85% done, 90% to go ________________________________ Message 2 _____________________________________ Time: 08:15:24 AM PST US From: "Carl Froehlich" Subject: RE: RV10-List: GPS mounting I mounted both the Garmin 650 and Dynon SkyView GPS antennas on top of the glare shield. Both work perfectly and is as easy an install as you will get. I did the same in the 8A (flying 10 years). Of interest, given a few minutes the SkyView GPS even locks in when the plane is inside a metal roof hangar with the metal door shut. Carl From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Kelly McMullen Sent: Friday, November 23, 2012 10:04 AM Subject: RV10-List: GPS mounting I am thinking about mounting my Garmin GA-35 antenna on top of the cabin cover just behind the rear door post area where the roof gets thinner. The antenna calls for a ground plane. (first gps ant I've seen wanting one). I'm guessing I will need both thin metal/tin foil, and a grounding wire if I do that. Just wondering what others have done. I likely will put my Dynon GPS ant under the cowl just forward of the firewall, and it doesn't need ground plane. Kelly 85% done, 90% to go ________________________________ Message 3 _____________________________________ Time: 08:34:55 AM PST US Subject: Re: RV10-List: GPS mounting From: Michael Kraus I mounted all my GPS antennas, GDL39 module, and my XM antenna under the cow l in front of the firewall. Works awesome and probably save 8 knots of drag :-).... Well, at least I don't have to look at them.... -Mike Kraus Sent from my iPhone On Nov 23, 2012, at 11:14 AM, "Carl Froehlich" w rote: > I mounted both the Garmin 650 and Dynon SkyView GPS antennas on top of the glare shield. Both work perfectly and is as easy an install as you will ge t. I did the same in the 8A (flying 10 years). > > Of interest, given a few minutes the SkyView GPS even locks in when the pl ane is inside a metal roof hangar with the metal door shut. > > Carl > > From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server@ matronics.com] On Behalf Of Kelly McMullen > Sent: Friday, November 23, 2012 10:04 AM > To: rv10-list@matronics.com > Subject: RV10-List: GPS mounting > > I am thinking about mounting my Garmin GA-35 antenna on top of the cabin c over just behind the rear door post area where the roof gets thinner. The an tenna calls for a ground plane. (first gps ant I've seen wanting one). I'm g uessing I will need both thin metal/tin foil, and a grounding wire if I do t hat. Just wondering what others have done. I likely will put my Dynon GPS an t under the cowl just forward of the firewall, and it doesn't need ground pl ane. > Kelly > 85% done, 90% to go > > www.aeroelectric.com http://www.matronic================= > http://forums.matronics.com==== > > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ________________________________ Message 4 _____________________________________ Time: 09:24:46 AM PST US Subject: Re: RV10-List: GPS mounting From: Seano I had to mount one for my gts800. I used a 10x18 sheet of aluminum epoxied a nd riveted to cabin top first layer then blended and covered with glass clot h. Can't tell it is there at all. Couldn't use the inside of cabin top becau se of thickness. When I was testing I used 300mph tape and it worked as a gr ound plane too. I used the same tape to connect the ground plane to ground b y wrapping it to the inside of the cabin top through the 1-1/2 inch coax hol e. Sent from my iPhone On Nov 23, 2012, at 8:03, Kelly McMullen wrote: > I am thinking about mounting my Garmin GA-35 antenna on top of the cabin c over just behind the rear door post area where the roof gets thinner. The an tenna calls for a ground plane. (first gps ant I've seen wanting one). I'm g uessing I will need both thin metal/tin foil, and a grounding wire if I do t hat. Just wondering what others have done. I likely will put my Dynon GPS an t under the cowl just forward of the firewall, and it doesn't need ground pl ane. > Kelly > 85% done, 90% to go > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ________________________________ Message 5 _____________________________________ Time: 09:40:51 AM PST US From: Jay Rowe Subject: Re: RV10-List: GPS mounting I am repainting my 10 (professionly this time) and would like to use metalli c paint. I have my nav and glide slope ants. in the wing tips, ADSB-IN and G RT gps under fiberglass access panels in front of the windshield, and ELT un der the epi. fairing. All the other ants. are mounted externally. I have had LOTS of different opinions about metallic paint over fiberglass interfering with antenna functioning. Does anyone have solid data or information? Tha nks, Jay Rowe 320 hours Sent from my iPhone On Nov 23, 2012, at 8:34 AM, Michael Kraus wrot e: > I mounted all my GPS antennas, GDL39 module, and my XM antenna under the c owl in front of the firewall. Works awesome and probably save 8 knots of dr ag :-).... Well, at least I don't have to look at them.... > -Mike Kraus > > Sent from my iPhone > > On Nov 23, 2012, at 11:14 AM, "Carl Froehlich" wrote: > >> I mounted both the Garmin 650 and Dynon SkyView GPS antennas on top of th e glare shield. Both work perfectly and is as easy an install as you will g et. I did the same in the 8A (flying 10 years). >> >> Of interest, given a few minutes the SkyView GPS even locks in when the p lane is inside a metal roof hangar with the metal door shut. >> >> Carl >> >> From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server @matronics.com] On Behalf Of Kelly McMullen >> Sent: Friday, November 23, 2012 10:04 AM >> To: rv10-list@matronics.com >> Subject: RV10-List: GPS mounting >> >> I am thinking about mounting my Garmin GA-35 antenna on top of the cabin c over just behind the rear door post area where the roof gets thinner. The an tenna calls for a ground plane. (first gps ant I've seen wanting one). I'm g uessing I will need both thin metal/tin foil, and a grounding wire if I do t hat. Just wondering what others have done. I likely will put my Dynon GPS an t under the cowl just forward of the firewall, and it doesn't need ground pl ane. >> Kelly >> 85% done, 90% to go >> >> www.aeroelectric.com http://www.matronic================ >> http://forums.matronics.com==== >> >> >> >> ========================= ========= >> ctric.com >> >www.buildersbooks.com >> uilthelp.com >> matronics.com/contribution >> ========================= ========= >> ://www.matronics.com/Navigator?RV10-List >> ========================= ========= >> cs.com >> ========================= ========= >> > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ________________________________ Message 6 _____________________________________ Time: 10:41:39 AM PST US From: Sean Stephens Subject: RV10-List: Spinner Back Plate Hardware On page 47-02 Step 4 it states that the spacers and hardware required to attach the spinner back plate to the prop are supplied with the propeller. I ordered my prop from Vans and did not receive any such hardware with the prop. I'll be calling Vans about this on Monday, but was wondering if anyone else had this situation? -Sean #40303 (engine mounted today) ________________________________ Message 7 _____________________________________ Time: 10:43:09 AM PST US Subject: RV10-List: Re: GPS mounting From: "Jim Berry" Jay, My Nav antennae are wingtip mounted. There is no discernible difference in performance now that they are painted with a very metallic PPG paint, compared to when they were unpainted. Jim Berry Read this topic online here: http://forums.matronics.com/viewtopic.php?p=388746#388746 ________________________________ Message 8 _____________________________________ Time: 10:46:31 AM PST US From: Sean Stephens Subject: RV10-List: Re: Spinner Back Plate Hardware Please disregard. I just realized that the hardware was attached to the prop hub. All this engine and prop stuff has me a bit jittery. First time I've done anything like either and the install manuals need to be read a few more times in order to decipher. :) On 11/23/12 12:40 PM, Sean Stephens wrote: > On page 47-02 Step 4 it states that the spacers and hardware required > to attach the spinner back plate to the prop are supplied with the > propeller. > > I ordered my prop from Vans and did not receive any such hardware with > the prop. I'll be calling Vans about this on Monday, but was > wondering if anyone else had this situation? > > -Sean #40303 (engine mounted today) ________________________________ Message 9 _____________________________________ Time: 11:08:29 AM PST US From: "Carl Froehlich" Subject: RE: RV10-List: GPS mounting The paint makes no difference. I have a homebrew wingtip VOR/GS antenna in the 10 and 8A, both metallic paint. They work well. Carl From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Jay Rowe Sent: Friday, November 23, 2012 12:40 PM Subject: Re: RV10-List: GPS mounting I am repainting my 10 (professionly this time) and would like to use metallic paint. I have my nav and glide slope ants. in the wing tips, ADSB-IN and GRT gps under fiberglass access panels in front of the windshield, and ELT under the epi. fairing. All the other ants. are mounted externally. I have had LOTS of different opinions about metallic paint over fiberglass interfering with antenna functioning. Does anyone have solid data or information? Thanks, Jay Rowe 320 hours Sent from my iPhone On Nov 23, 2012, at 8:34 AM, Michael Kraus wrote: I mounted all my GPS antennas, GDL39 module, and my XM antenna under the cowl in front of the firewall. Works awesome and probably save 8 knots of drag :-).... Well, at least I don't have to look at them.... -Mike Kraus Sent from my iPhone On Nov 23, 2012, at 11:14 AM, "Carl Froehlich" wrote: I mounted both the Garmin 650 and Dynon SkyView GPS antennas on top of the glare shield. Both work perfectly and is as easy an install as you will get. I did the same in the 8A (flying 10 years). Of interest, given a few minutes the SkyView GPS even locks in when the plane is inside a metal roof hangar with the metal door shut. Carl From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Kelly McMullen Sent: Friday, November 23, 2012 10:04 AM Subject: RV10-List: GPS mounting I am thinking about mounting my Garmin GA-35 antenna on top of the cabin cover just behind the rear door post area where the roof gets thinner. The antenna calls for a ground plane. (first gps ant I've seen wanting one). I'm guessing I will need both thin metal/tin foil, and a grounding wire if I do that. Just wondering what others have done. I likely will put my Dynon GPS ant under the cowl just forward of the firewall, and it doesn't need ground plane. Kelly 85% done, 90% to go www.aeroelectric.com http://www.matronic================ ="" http://forums.matronics.com==== ================================== ctric.com >www.buildersbooks.com uilthelp.com matronics.com/contribution ================================== ://www.matronics.com/Navigator?RV10-List ================================== cs.com ================================== ================================== ctric.com >www.buildersbooks.com uilthelp.com matronics.com/contribution ================================== ://www.matronics.com/Navigator?RV10-List ================================== cs.com ================================== ________________________________ Message 10 ____________________________________ Time: 12:34:26 PM PST US From: Kelly McMullen Subject: Re: RV10-List: GPS mounting I can tell you that a friend with RV-7A put a Bob Archer nav antenna in one wingtip, along with marker antenna, and a BA com antenna in the other wingtip. They worked fine until he had the wingtips painted metallic silver to go with his polished alum airframe. The metallic paint reduced the reception and transmit range to about 10 miles of mediocre quality. He wound up putting a CI-122 on a wing access panel to restore com function to reasonable range. On 11/23/2012 10:40 AM, Jay Rowe wrote: > I am repainting my 10 (professionly this time) and would like to use > metallic paint. I have my nav and glide slope ants. in the wing tips, > ADSB-IN and GRT gps under fiberglass access panels in front of the > windshield, and ELT under the epi. fairing. All the other ants. are > mounted externally. I have had LOTS of different opinions about > metallic paint over fiberglass interfering with antenna functioning. > Does anyone have solid data or information? Thanks, Jay Rowe 320 hours > > Sent from my iPhone > > On Nov 23, 2012, at 8:34 AM, Michael Kraus > wrote: > >> I mounted all my GPS antennas, GDL39 module, and my XM antenna under >> the cowl in front of the firewall. Works awesome and probably save 8 >> knots of drag :-).... Well, at least I don't have to look at them.... >> -Mike Kraus >> >> Sent from my iPhone >> >> On Nov 23, 2012, at 11:14 AM, "Carl Froehlich" >> > wrote: >> >>> I mounted both the Garmin 650 and Dynon SkyView GPS antennas on top >>> of the glare shield. Both work perfectly and is as easy an install >>> as you will get. I did the same in the 8A (flying 10 years). >>> >>> Of interest, given a few minutes the SkyView GPS even locks in when >>> the plane is inside a metal roof hangar with the metal door shut. >>> >>> Carl >>> >>> *From:*owner-rv10-list-server@matronics.com >>> >>> [mailto:owner-rv10-list-server@matronics.com] *On Behalf Of *Kelly >>> McMullen >>> *Sent:* Friday, November 23, 2012 10:04 AM >>> *To:* rv10-list@matronics.com >>> *Subject:* RV10-List: GPS mounting >>> >>> I am thinking about mounting my Garmin GA-35 antenna on top of the >>> cabin cover just behind the rear door post area where the roof gets >>> thinner. The antenna calls for a ground plane. (first gps ant I've >>> seen wanting one). I'm guessing I will need both thin metal/tin >>> foil, and a grounding wire if I do that. Just wondering what others >>> have done. I likely will put my Dynon GPS ant under the cowl just >>> forward of the firewall, and it doesn't need ground plane. >>> Kelly >>> 85% done, 90% to go >>> >>> * * >>> * *www.aeroelectric.com www.homebuilthelp.com http://www.matronics.com/c= -Matt Dralle, List - The RV10-List Email Forum utilities such as List Photoshare, and much much -->http://www.matronic================= >>> http://forums.matronics.com >>> ==== >>> * * >>> * >>> >>> ================================== >>> ctric.com >>> >www.buildersbooks.com >>> uilthelp.com >>> matronics.com/contribution >>> ================================== >>> ://www.matronics.com/Navigator?RV10-List >>> ================================== >>> cs.com >>> ================================== >>> >>> * >> * >> >> ================================== >> ctric.com >> >www.buildersbooks.com >> uilthelp.com >> matronics.com/contribution >> ================================== >> ://www.matronics.com/Navigator?RV10-List >> ================================== >> cs.com >> ================================== >> >> * > * > > > * ----- No virus found in this message. Checked by AVG - www.avg.com ________________________________ Message 11 ____________________________________ Time: 01:07:28 PM PST US Subject: Re: RV10-List: Re: Spinner Back Plate Hardware From: Kelly McMullen Yes, kind of spooks folks that haven't dealt with a Hartzell prop before. Bolts are built in, get changed when prop is overhauled. More fun finding correct wrench or a crow's foot socket that works with those bolts. On Fri, Nov 23, 2012 at 11:46 AM, Sean Stephens wrote: > > Please disregard. I just realized that the hardware was attached to the > prop hub. > > All this engine and prop stuff has me a bit jittery. First time I've done > anything like either and the install manuals need to be read a few more > times in order to decipher. :) > > > On 11/23/12 12:40 PM, Sean Stephens wrote: > >> On page 47-02 Step 4 it states that the spacers and hardware required to >> attach the spinner back plate to the prop are supplied with the propeller. >> >> I ordered my prop from Vans and did not receive any such hardware with >> the prop. I'll be calling Vans about this on Monday, but was wondering if >> anyone else had this situation? >> >> -Sean #40303 (engine mounted today) >> > > ________________________________ Message 12 ____________________________________ Time: 01:08:45 PM PST US Subject: Re: RV10-List: GPS mounting From: Kelly McMullen Any concerns about heat? Anyone actually measured temps between engine mount and firewall? Of course any engine fire could get real expensive in a hurry if it damaged those units. On Fri, Nov 23, 2012 at 9:34 AM, Michael Kraus wrote: > I mounted all my GPS antennas, GDL39 module, and my XM antenna under the > cowl in front of the firewall. Works awesome and probably save 8 knots o f > drag :-).... Well, at least I don't have to look at them.... > -Mike Kraus > > Sent from my iPhone > > On Nov 23, 2012, at 11:14 AM, "Carl Froehlich" > wrote: > > I mounted both the Garmin 650 and Dynon SkyView GPS antennas on top of th e > glare shield. Both work perfectly and is as easy an install as you will > get. I did the same in the 8A (flying 10 years).**** > > ** ** > > Of interest, given a few minutes the SkyView GPS even locks in when the > plane is inside a metal roof hangar with the metal door shut.**** > > ** ** > > Carl**** > > ** ** > > *From:* owner-rv10-list-server@matronics.com [ > mailto:owner-rv10-list-server@matronics.com] > *On Behalf Of *Kelly McMullen > *Sent:* Friday, November 23, 2012 10:04 AM > *To:* rv10-list@matronics.com > *Subject:* RV10-List: GPS mounting**** > > ** ** > > I am thinking about mounting my Garmin GA-35 antenna on top of the cabin > cover just behind the rear door post area where the roof gets thinner. Th e > antenna calls for a ground plane. (first gps ant I've seen wanting one). > I'm guessing I will need both thin metal/tin foil, and a grounding wire i f > I do that. Just wondering what others have done. I likely will put my Dyn on > GPS ant under the cowl just forward of the firewall, and it doesn't need > ground plane. > Kelly > 85% done, 90% to go**** > > * * > > * *www.aeroelectric.com**** http://www.matronic=========== ======**** **** > > **http://forums.matronics.com** > **=====**** > > * * > > ** > > * > > ======================== ===========ctric.com > >www.buildersbooks.comuilthelp.commatronics.com/contribution > ======================== > ://www.matronics.com/Navigator?RV10-List > ======================== ===========cs.com > ======================== > * > > * > =========== =========== =========== =========== > * > > ________________________________ Message 13 ____________________________________ Time: 01:27:00 PM PST US Subject: RV10-List: Re: Spinner Back Plate Hardware From: "Bob Turner" Make sure your engine is set up for a CS prop. It seems engines, even new ones ordered thru Vans, vary. Some have the plug inside the crankshaft that needs to be removed; some don't. -------- Bob Turner RV-10 QB Read this topic online here: http://forums.matronics.com/viewtopic.php?p=388758#388758 ________________________________ Message 14 ____________________________________ Time: 01:39:29 PM PST US Subject: RV10-List: Re: GPS mounting From: "Bob Turner" Jay and others: if the "metallic paint" actually conducts electricity (put an ohmeter on it) then it will affect the internal antenna's reception. However if the paint has tiny metallic flakes which are insulated from each other by the rest of the paint then the effect will be much smaller. Fiberglass top ground plane: There is no need to run a wire to the airframe. All of the currents in the ground plane should flow in and out of the coax ground shield. (The ground plane looks like a "mirror" to the vertical antenna, and acts in the same way). However, I would be concerned with a ground plane on the inside of the cabin and the antenna on the outside. They should be close to each other, close meaning in terms of wavelength. GPS is at 1.6 GHz which has a wavelength of 20 cm. I'd want the ground plane within 2 cm, minimum (3/4"), closer is better. How thick is the top? -------- Bob Turner RV-10 QB Read this topic online here: http://forums.matronics.com/viewtopic.php?p=388759#388759 ________________________________ Message 15 ____________________________________ Time: 03:18:02 PM PST US From: cloudvalley@comcast.net Subject: RV10-List: test Testing to see if this goes through.. ________________________________ Message 16 ____________________________________ Time: 04:47:06 PM PST US Subject: Re: RV10-List: Re: GPS mounting From: Kelly McMullen I have yet to understand why a GPS antenna needs a ground plane, when those in handhelds, Ipads, etc work great without one. Given the size of the antenna one would expect a full dipole rather than a quarter wave. Dynon's antenna/receiver is smaller than the Garmin antenna and needs no ground plane. I would guess the area of the top I am looking at is around 1/3-1/2" thick, not the area around the doors that is probably 1.5" thick with the foam sandwich. On Fri, Nov 23, 2012 at 2:38 PM, Bob Turner wrote: > > > Fiberglass top ground plane: There is no need to run a wire to the > airframe. All of the currents in the ground plane should flow in and out of > the coax ground shield. (The ground plane looks like a "mirror" to the > vertical antenna, and acts in the same way). However, I would be concerned > with a ground plane on the inside of the cabin and the antenna on the > outside. They should be close to each other, close meaning in terms of > wavelength. GPS is at 1.6 GHz which has a wavelength of 20 cm. I'd want the > ground plane within 2 cm, minimum (3/4"), closer is better. How thick is > the top? > > -------- > Bob Turner > RV-10 QB > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=388759#388759 > > ________________________________ Message 17 ____________________________________ Time: 04:48:47 PM PST US From: "Seano" Subject: Re: RV10-List: Re: GPS mounting For my GTS800 antenna the top is too thick to use a ground plane on the inside. It will not work, I tried this. When I installed this antenna I tried to follow Garmins recommendations for grounding. The GTS800 has an O-ring like many other GPS antennas and as you can read below it states to use the mounting screws, not the coax. This is for the GTS800 not the GPS. Below is part of the GTS800 instructions. Further down you can read Garmin's instructions for the G3X GPS/XM antenna concerning the ground plane. It states the mounting screws AND the coax. 2.3 Electrical Bonding Electrical equipment, supporting brackets, and racks should be electrically bonded to the aircraft's main structure. Refer to SAE ARP 1870 section 5 when surface preparation is required to achieve electrical bond. The electrical bond should achieve direct current (DC) resistance less than or equal to 2.5 milliohms to local structure to where the equipment is mounted. Compliance should be verified by inspection using a calibrated milliohm meter. An equivalent OEM procedure may also be substituted. There may be OEM-specific reasons for electrically isolating equipment or having a higher bond resistance. These reasons should be rationalized upon installation approval. In general, Garmin recommends that all GTS 8XX equipment be electrically bonded. The antenna ground plane and doubler plate must be electrically bonded to the antenna baseplate. The electrical bond must achieve direct current (DC) resistance less than or equal to 2.5 milliohms. For composite aircraft, the antenna baseplate must be electrically bonded to the common ground of other installed equipment for lightning purposes. This can be achieved through the antenna mounting screws. G3X GPS/XM Antenna 6.4.5 Antenna Grounding Plane Although no ground plane is required, the antennas typically perform better when a ground plane is used. The ground plane should be a conductive surface as large as practical, with a minimum diameter of 8 inches. To use an antenna in aircraft with fabric or composite skin, a ground plane is recommended. It is usually installed under the skin of the aircraft, below the antenna, and is made of either aluminum sheet or of wire mesh. 6.4.6 Antenna Grounding The antenna is grounded through the mounting hardware and the coax connection. The mounting hardware (washers and nuts) and doubler plate should make contact with an unpainted grounded surface ensuring proper antenna grounding. It is important to have good conductivity between the coaxial shield and the ground plane. The bottom of the antenna does not need to make contact with the ground plane (i.e. the surface may be painted). From: "Bob Turner" Sent: Friday, November 23, 2012 2:38 PM Subject: RV10-List: Re: GPS mounting > > Jay and others: if the "metallic paint" actually conducts electricity (put > an ohmeter on it) then it will affect the internal antenna's reception. > However if the paint has tiny metallic flakes which are insulated from > each other by the rest of the paint then the effect will be much smaller. > > Fiberglass top ground plane: There is no need to run a wire to the > airframe. All of the currents in the ground plane should flow in and out > of the coax ground shield. (The ground plane looks like a "mirror" to the > vertical antenna, and acts in the same way). However, I would be concerned > with a ground plane on the inside of the cabin and the antenna on the > outside. They should be close to each other, close meaning in terms of > wavelength. GPS is at 1.6 GHz which has a wavelength of 20 cm. I'd want > the ground plane within 2 cm, minimum (3/4"), closer is better. How thick > is the top? > > -------- > Bob Turner > RV-10 QB > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=388759#388759 > > > ________________________________ Message 18 ____________________________________ Time: 05:41:44 PM PST US Subject: Re: RV10-List: Re: GPS mounting From: Dave Saylor It may be that Garmin just wants the base of the antenna to be grounded, as o pposed to what we normally think of as a ground plane. That would of course be accomplished through the coax as someone pointed out. My sense has alway s been that the GPS antenna has the ground plane built in. I've mounted many to fiberglass in the past but not to the top of a 10. I don't think I'd hes itate. It's receive only so you can't really hurt anything, you just risk po or antenna performance. --Dave On Nov 23, 2012, at 17:46, Kelly McMullen wrote: > I have yet to understand why a GPS antenna needs a ground plane, when thos e in handhelds, Ipads, etc work great without one. Given the size of the ant enna one would expect a full dipole rather than a quarter wave. Dynon's ante nna/receiver is smaller than the Garmin antenna and needs no ground plane. > I would guess the area of the top I am looking at is around 1/3-1/2" thick , not the area around the doors that is probably 1.5" thick with the foam sa ndwich. > > On Fri, Nov 23, 2012 at 2:38 PM, Bob Turner wrote : >> >> >> Fiberglass top ground plane: There is no need to run a wire to the airfra me. All of the currents in the ground plane should flow in and out of the co ax ground shield. (The ground plane looks like a "mirror" to the vertical an tenna, and acts in the same way). However, I would be concerned with a groun d plane on the inside of the cabin and the antenna on the outside. They shou ld be close to each other, close meaning in terms of wavelength. GPS is at 1 .6 GHz which has a wavelength of 20 cm. I'd want the ground plane within 2 c m, minimum (3/4"), closer is better. How thick is the top? >> >> -------- >> Bob Turner >> RV-10 QB >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=388759#388759 >> >> >> >> >> >> >> >> ========== >> ="_blank">www.aeroelectric.com >> ooks.com" target="_blank">www.buildersbooks.com >> et="_blank">www.homebuilthelp.com >> ="_blank">http://www.matronics.com/contribution >> le, List Admin. >> ========== >> arget="_blank">http://www.matronics.com/Navigator?RV10-List >> ========== >> http://forums.matronics.com >> ========== > > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv10-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV10-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/rv10-list Browse Digests http://www.matronics.com/digest/rv10-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.