john.marzulli(at)gmail.co
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 Posted: Wed Sep 09, 2009 9:05 am Post subject: VHF & Transponder separation requirements on 701 |
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No idea what the minimum separation is.... BUT
The approach I took was VHF on the top and the transponder on the bottom.
Works on my Cessna, so I think it will work on the 701.
If you take that approach then you will have at least 36" of separation.
DO NOT ARCHIVE
John Marzulli
http://www.GenevieveMarzulli.org/
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
On Wed, Sep 9, 2009 at 9:35 AM, Stanley A Challgren <challgren(at)mac.com (challgren(at)mac.com)> wrote:
[quote] Listees:
I am in the process of ordering my Garmin SL40 radio and GTX 330 Transponder and am unable to find minimum separation distances between the two antennas. John at Stein Avionics seemed to think that 24" would be sufficient. As I sit on my creeper in the hellhole I realize that placing the antennas much more than arm's length away would not be advisable. I also have to consider the location of the Magnetometer for the Grand Rapids EFIS Sport.
I thought Bingelis would have the answer. If he did, I could not find it. I also thought The AeroElectric Connection would have the answer. Again, if it did; I could not find it. I remember reading about radiating planes around antennas and needing them for maximum communication distances but can't find the reference. I googled Aircraft Antenna Locations and found "Mount the antennas at least 36 inches away from obstructions and as far as possible from other antennas." It also said "On fabric covered aircraft...,it will be necessary to provide a flat metallic surface or "ground plane" extending at least 12 inches in all directions from the center of the antenna."
Given the above background, I am considering mounting the VHF radio antenna on the far starboard side of the tail section within arm's reach of the Maintenance Access Opening (hellhole). I would mount the transponder antenna on the other side, again right up next to the vertical bulkhead. I would put the magnetometer between the two antennas. The two antennas would be about 24" apart.
My question then is, from those who are flying their 701's: Is what I suggest feasible, or; are you using a different plan that works?
All comments would be appreciated.
Confused in Colorado.
Stan Challgren
701/3300
[b]
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