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10-30-2009, 05:17 PM
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Join Date: Jun 2008
Location: Charlottesville, VA
Posts: 801
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Quote:
Originally Posted by Bob Hoffman
Yes , a picture (or two) would be appreciated.
Bob
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Here are 3 pictures of the installation. The smaller Garmin 696 antenna was 'glued' to the aluminum plate with high temp RTV. The installation has been working great and I have never had a loss of signal to either the 696 or the XM. I think mounting the antennas to the engine mount reduces the vibration the antennas are subjected to since the engine mount is rigid. I think a firewall mount might transmit more vibration since it is less rigid than the engine mount, although I have not done any testing to verify that theory. Another plus is that this method mounts the antennas up high and therefore signal 'shielding' from an adjacent structure is less likely. Hope this helps.

__________________
Jim Shannon
RV-8 N52VV
Charlottesville, VA
AFS 4500 EFIS & 3400 EFIS/EM
G430W - SL30 - G327 - G696 - G240
TT DigiFlight II VSVG w/pitch autotrim
VP-X Pro
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11-01-2009, 08:03 AM
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Join Date: Jan 2005
Posts: 206
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flickroll,
Thanks for the pics , Nicely done, it never ceases to amaze me the skill and imagination and willingness to help that the RV community has.
Thank you all
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11-01-2009, 08:04 AM
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Join Date: Jan 2005
Posts: 206
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flickroll,
Thanks for the pics , Nicely done, it never ceases to amaze me the skill and imagination and willingness to help that this RV community has.
Thank you all
Bob
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11-01-2009, 09:12 AM
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Join Date: Jun 2008
Location: Charlottesville, VA
Posts: 801
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Quote:
Originally Posted by Bob Hoffman
flickroll,
Thanks for the pics , Nicely done, it never ceases to amaze me the skill and imagination and willingness to help that this RV community has.
Thank you all
Bob
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You're welcome Bob. Another thing I considered when I decided to make the engine mount antenna shelf is that if/when I change avionics in the airplane and I have different and/or additional antennas to mount, I can whip up a new shelf pretty easily and mount it with the Adel clamp method. If the antennas are mounted on a shelf attached to the firewall (didn't like it there to begin with as I'd like to keep the number of holes in the firewall to a minimum), the new antenna mount will need to utilize the holes already in the firewall (which may not be the best solution for your new mount), or you drill new ones, adding even more holes to the firewall. YMMV
__________________
Jim Shannon
RV-8 N52VV
Charlottesville, VA
AFS 4500 EFIS & 3400 EFIS/EM
G430W - SL30 - G327 - G696 - G240
TT DigiFlight II VSVG w/pitch autotrim
VP-X Pro
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11-01-2009, 10:44 AM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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Here's a photo of the small garmin antenna shelf I fabricated. Bolted to the firewall near center, using 1" standoff tubes to keep it forward of the deck. No problems with reception or interference so far. Imron paint on cowl.

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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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03-24-2010, 04:46 PM
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Join Date: Jun 2006
Location: Boca Raton, Florida
Posts: 436
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Cutting GPS Antenna cable(Garmin)
you guys mounting the antennas under the cowl, is there any way to cut and splice these wires so as not to put a 5/8" hole in the firewall for the end of the Garmin wire?
Thanks
Al Grajek
__________________
Al "Nordo" Grajek
repeat offender
\___(0)___/
RV8
RV8A
RV8
RV6A
Now RV7A!!
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03-24-2010, 05:19 PM
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Join Date: Apr 2005
Location: KSLC
Posts: 4,021
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Quote:
Originally Posted by algrajek
you guys mounting the antennas under the cowl, is there any way to cut and splice these wires so as not to put a 5/8" hole in the firewall for the end of the Garmin wire?
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Just another thought, since I used one for a cable. The one in the middle splits in half, which would allow the Garmin connector through, with no splice or end replacement. As I remember, the hole to mount this was somewhere around 7/8". But I'd check on the hole size first..
http://www.vansaircraft.com/cgi-bin/...roduct=one_eye
L.Adamson -- RV6A
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03-24-2010, 09:42 PM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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Or you can make your own cable and put the connector on one end after you put through the FW.
greg
__________________
Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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