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
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| Subject: | "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
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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
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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
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| Subject: | Re: GPS mounting |
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" <carl.froehlich@verizon.net> 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<www.buildersbooks.comwww.homebuilthelp.comhttp://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====
>
>
>
==========================
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>
Message 4
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| Subject: | Re: GPS mounting |
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 <apilot2@gmail.com> 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
>
>
==========================
=========
==========================
=========
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=========
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=========
>
Message 5
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| Subject: | Re: 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 <n223rv@wolflakeairport.net> 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" <carl.froehlich@verizon.net
> 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<www.buildersbooks.comwww.homebuilthelp.comhttp://ww
w.matronics.com/c= -Matt Dralle, List
- The RV10-List Email Forum utilities such as List Photoshare, and much muc
h --> 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
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| Subject: | 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
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| Subject: | Re: GPS mounting |
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
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| Subject: | 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
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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 <n223rv@wolflakeairport.net>
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" <carl.froehlich@verizon.net>
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<www.buildersbooks.comwww.homebuilthelp.comhttp://www.ma
tronics.com/c= -Matt Dralle, List - The
RV10-List Email Forum utilities such as List Photoshare, and much much
--> http://www.matronic================
<http://www.matronics.com/Navigator?RV10-List>
<http://www.matronics.com/Navigator?RV10-List> <nbsp; -="" matronics=""
web="" forums="" via="" the="" ="" -->=""
http://forums.matronics.com</nbsp; >====
==================================
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
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| Subject: | Re: 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 <n223rv@wolflakeairport.net
> <mailto:n223rv@wolflakeairport.net>> 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"
>> <carl.froehlich@verizon.net <mailto:carl.froehlich@verizon.net>> 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>
>>> [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 <mailto: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 <http://www.aeroelectric.com><www.buildersbooks.com <http://www.buildersbooks.com>www.homebuilthelp.com <http://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://www.matronics.com/Navigator?RV10-List>
>>> http://forums.matronics.com
>>> <http://www.matronics.com/Navigator?RV10-List>====
>>> * *
>>> *
>>>
>>> ==================================
>>> ctric.com <http://ctric.com>
>>> >www.buildersbooks.com <http://www.buildersbooks.com>
>>> uilthelp.com <http://uilthelp.com>
>>> matronics.com/contribution <http://matronics.com/contribution>
>>> ==================================
>>> ://www.matronics.com/Navigator?RV10-List <http://www.matronics.com/Navigator?RV10-List>
>>> ==================================
>>> cs.com <http://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
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| Subject: | Re: Spinner Back Plate Hardware |
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 <sean@stephensville.com>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
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| Subject: | Re: GPS mounting |
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
<n223rv@wolflakeairport.net>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" <carl.froehlich@verizon.ne
t>
> 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<owner-rv10-list-server@matron
ics.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****<www.buildersbooks.com**www.homebuilthelp.com*
*http://www.matronics.com/c= -Matt Dralle, L
ist - The RV10-List Email Forum utilities such as List Photoshare,
and much much --> http://www.matronic===========
======**** <http://www.matronics.com/Navigator?RV10-List>****
>
> **http://forums.matronics.com**<http://www.matronics.com/Navigator?RV10-L
ist>
> **=====****
>
> * *
>
> **
>
> *
>
> ========================
===========ctric.com
> >www.buildersbooks.comuilthelp.commatronics.com/contribution
> ========================
> ://www.matronics.com/Navigator?RV10-List
> ========================
===========cs.com
> ========================
> *
>
> *
>
===========
===========
===========
===========
> *
>
>
Message 13
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| Subject: | Re: Spinner Back Plate Hardware |
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
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| Subject: | 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 15
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Testing to see if this goes through..
Message 16
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| Subject: | Re: GPS mounting |
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 <bobturner@alum.rpi.edu> 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
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| Subject: | 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" <bobturner@alum.rpi.edu>
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
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| Subject: | Re: GPS mounting |
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 <apilot2@gmail.com> 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 <bobturner@alum.rpi.edu> 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
>> ==========
>
>
>
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