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09-13-2011, 11:57 AM
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Join Date: Nov 2005
Posts: 1,256
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Dual comm antennae - which bay?
I have to Comant bent whip antennae, and figure to put them on the belly, underneath the seats (rather than the baggage area, or forward of the spar).
Quick, simple question...which bay(s) would or do you use? I'm thinking the most outboard bays, but is there any reason to go inboard one more bay?
Follow-up...far enough back to not interfere with wing bolts, but how far is too far?
(I suppose I could make a poll for this  ).
TIA!
Steve-a-reno
__________________
Steve "Flying Scotsman"
Santa Clarita, CA
PP-ASEL, ASES, Instrument Airplane
RV-7A N660WS flying!
#8,000
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09-13-2011, 12:05 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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What model of RV??
As I recall, rule of thumb is to keep them 3', or more, apart.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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09-13-2011, 01:33 PM
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Join Date: Nov 2005
Posts: 1,256
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Sorry...should have said...7A. (I thought it was in my signature, but it wasn't, so I'll fix that  ).
__________________
Steve "Flying Scotsman"
Santa Clarita, CA
PP-ASEL, ASES, Instrument Airplane
RV-7A N660WS flying!
#8,000
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09-13-2011, 08:18 PM
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Join Date: Nov 2008
Location: North Central Oregon
Posts: 106
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Hi Steve,
I put them in the outboard bays far enough aft so we could still swing a hammer to drive the wing bolts in, and not so far aft so we couldn’t get to them easily since the seat pan is riveted in place….. http://tinypic.com/r/20kb33d/7
pk
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09-13-2011, 10:52 PM
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Join Date: Nov 2007
Location: Reno, NV
Posts: 2,125
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Steve,
Because I placed the Dynon AP roll servo in the outboard left bay (RV-6), I ended up using the next bay inboard on each side for a dual Comant set-up. That placed the antennae 27" apart (less than the recommended 36", as Mike said).
With that set-up I had bleed over from comm 2 to comm 1 when transmitting on comm 2. This may have been due to my odd-ball radio set-up (comm 2 is a Kenwood emergency responder's SAR radio, 137-174 MHz). However, none of my shielding efforts worked. Ended up moving comm 1 back to the center of the fuse, and comm 2 to the wingtip (I'm hoping it was a speed mod too  ).
A friend has the same radios on whips in the outer bays with no bleed-over, so FWIW, I would stick with the outer bays if possible, to avoid the possible interference. Others may have differing experiences, so YMMV.
Cheers,
Bob
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09-13-2011, 11:49 PM
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Join Date: Oct 2007
Location: Belvidere, IL
Posts: 169
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I put mine under the wings and they worked great.
__________________
David Shelton, Aerospace Engineer and Soaring Nut.
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09-14-2011, 05:47 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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I used the outboard most bay under the seats and the radio's still bled over on each other. I ended up interlocking the radio's so as to prevent this problem. Works great otherwise.
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09-14-2011, 06:10 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,687
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I have one comm antenna centerline between the gear and the other one is in the second bay aft of the cargo bulkhead. Transponder ant is just behind the cargo bulkhead. Never had any problem.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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