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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