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pitts_pilot(at)bellsouth.
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 Posted: Wed Jul 20, 2011 2:30 pm Post subject: GPS antenna |
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Changed the subject.
On 7/20/2011 5:46 PM, Kelly McMullen wrote:
| Quote: |
I was just drilling there this a.m. There is a small gap between the
top and bottom layer, which was perfect for me inserting a cleco, but
I wasn't aware that signal attenuation was of particular concern with
regard to glass thickness, since it allegedly is pretty transparent to
RF.
I haven't been able to find any data on the signal degradation of FG
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...... but the satellite signal is awful puny by the time it gets
here. The more thickness, the more degradation. I was just comparing
the thickness of the VS fairing Vs. the cabin top. I know there are
antennas out there that work fine under a FG cowl. I wonder how many
antennas are out there working just fine under the cabin top.
Linn
| Quote: |
On 7/20/2011 8:21 AM, Linn Walters wrote:
>
> <pitts_pilot(at)bellsouth.net>
>
> I think the FG is still pretty thick back there. The VS fairing
> would be thinner ...... and there's a whole lot of aircraft out there
> flying with the GPS antenna on the glareshield.
> I like the glareshield mountiung .... shorter coax, less weight
> (those ounces add up!) and easier installation.
> Linn
>
> On 7/20/2011 8:48 AM, Kelly McMullen wrote:
>>
>>
>> One does have to wonder just how many satellites you would miss that
>> were shadowed by the vertical stab. Seems like you would still have
>> more than 300 degree view of the sky there.
>> Has anyone had success with GPS antenna under the cabin
>> cover(without making holes in the fiberglass)? Seems like there
>> shouldn't be a problem behind the door posts where there is no
>> honeycomb.
>>
>>
>> On 7/20/2011 5:26 AM, Bob Leffler wrote:
>>>
>>>
>>> I'm surprised that your not having reception issues with the
>>> antenna under the empennage fairing. The garmin install manual
>>> states to stay clear of the VS.
>>>
>>>
>>>
>>> On Jul 20, 2011, at 8:00 AM, "orchidman"<gary(at)wingscc.com> wrote:
>>>
>>>> The UAT antenna is mounted about 12" from the unit in the floor
>>>> of the tail section and the GPS is mounted under the fiber glass
>>>> cover between the tail section and the vertical stab.
>>
>>
>>
>>
>>
>
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Wed Jul 20, 2011 2:48 pm Post subject: GPS antenna |
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Yes, that would be very interesting. I know about the install that was
carved out to be encapsulated "in" the cabin cover and what Vans
opinion was about it, so seeking other options that don't require
something more on top of fuselage. Not saying Vans is right or wrong,
just that would prefer another solution.
On Wed, Jul 20, 2011 at 3:23 PM, Linn Walters <pitts_pilot(at)bellsouth.net> wrote:
| Quote: |
Changed the subject.
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| Quote: |
I haven't been able to find any data on the signal degradation of FG .......
but the satellite signal is awful puny by the time it gets here. The more
thickness, the more degradation. I was just comparing the thickness of the
VS fairing Vs. the cabin top. I know there are antennas out there that work
fine under a FG cowl. I wonder how many antennas are out there working just
fine under the cabin top.
Linn
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD |
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n223rv(at)wolflakeairport
Guest
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| Posted: Wed Jul 20, 2011 3:51 pm Post subject: GPS antenna |
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All mine are mounted between the firewall and the engine mount, under the cowling. Worked great for 8 years in my RV-4 and 44 hours in my RV-10.
Sent from my iPhone
On Jul 20, 2011, at 6:43 PM, Kelly McMullen <apilot2(at)gmail.com> wrote:
| Quote: |
Yes, that would be very interesting. I know about the install that was
carved out to be encapsulated "in" the cabin cover and what Vans
opinion was about it, so seeking other options that don't require
something more on top of fuselage. Not saying Vans is right or wrong,
just that would prefer another solution.
On Wed, Jul 20, 2011 at 3:23 PM, Linn Walters <pitts_pilot(at)bellsouth.net> wrote:
>
>
> Changed the subject.
>
> I haven't been able to find any data on the signal degradation of FG .......
> but the satellite signal is awful puny by the time it gets here. The more
> thickness, the more degradation. I was just comparing the thickness of the
> VS fairing Vs. the cabin top. I know there are antennas out there that work
> fine under a FG cowl. I wonder how many antennas are out there working just
> fine under the cabin top.
> Linn
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AirMike
Joined: 27 Feb 2007
Posts: 514
Location: Nevada
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| Posted: Wed Jul 20, 2011 11:05 pm Post subject: Re: GPS antenna |
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My Garmin 496 antenna is mounted on the top of the instrument panel and gets a good signal all the time. I saw a lot of nice installations inside the rear part of the cowl, but was concerned about the heat accumulating there after engine shutdown affecting the wire and antenna!
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_________________
See you OSH '18
Q/B - sold. |
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pilotdds(at)aol.com
Guest
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| Posted: Thu Jul 21, 2011 5:27 am Post subject: GPS antenna |
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My 430w ant is mounted on the glareshield near the trutrak ant-no problems in roughly 5 years full confidence for instrument approaches.
--
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