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Dual Radio's using the Split Com feature.

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Ray.R.Doerr(at)sprint.com
Guest

Posted: Mon Oct 15, 2007 6:41 am Post subject: Dual Radio's using the Split Com feature.

I have dual Garmin 430 radio's and their GMA 347 Audio Panel.

The panel has a split com feature that enables the Pilot to TX/RX on Com

1 while the Co-Pilot can TX/RX on Com 2.  I found on our trip to New

Mexico that when the Co-Pilot transmitted on 122.75 for air to air on

Com 2, that I would hear a fairly loud squeal on the Receive on Com 1

when I was listening to Center.  Every time you TX in Com 2, Com 1

breaks Squelch and you get a squeal.

	I have two bent whip (RAMI AV-17) antenna's on the belly under

the passenger seat which are 3' 4" apart.  The Garmin 430's have a

Tramsmit Interlock pin that can be wired to the MIC KEY of the opposite

radio, but if you do this the receiver sensitivity is reduced.  Also

when you use the Split Com feature of the Audio Panel, you would not

want the receiver sensitivity to be reduced.

	My question is to those that have dual radio's and have used the

split com feature so both the pilot and co-pilot can transmit at the

same time.  Are you having similar problems, if not where are your Com

Antenna's mounted?  I was thinking if I move one of my Com Antenna's to

the top of the aircraft, that may solve my problem, but I didn't want to

drill holes in the top skin just to find out that I still have the same

issue.



Thank You

Ray Doerr

N519RV 40250 (Hobbs=323)

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jesse(at)saintaviation.co
Guest

Posted: Mon Oct 15, 2007 10:31 am Post subject: Dual Radio's using the Split Com feature.

I have not specifically checked for those symptoms, but in several planes

with bent whips on the belly, also under 4' apart, I have never seen this or

heard of it, so I would look into some other options before moving the

antenna.  The other option would be to run a wire to a remote antenna (with

an adequate ground plane) outside the plane and test it on the ground to see

if it makes a difference.  Or, you could try putting a metal plate (sheet of

aluminum) between the antennas on the ground and see if that makes any

difference at all.



Jesse Saint

Saint Aviation, Inc.

jesse(at)saintaviation.com

www.saintaviation.com

Cell: 352-427-0285

Fax: 815-377-3694



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pitts_pilot(at)bellsouth.
Guest

Posted: Mon Oct 15, 2007 10:58 am Post subject: Dual Radio's using the Split Com feature.

Doerr, Ray R [NTK] wrote:



 	  Quote: 	
		  



  



snip
	




 	  Quote: 	
		   I was thinking if I move one of my Com Antenna's to

the top of the aircraft, that may solve my problem, but I didn't want to

drill holes in the top skin just to find out that I still have the same

issue.



Take a long piece of coax and run it to an antenna placed where you 
	


think it may work.  Support the antenna in it's normal position and tape 

it down.  Give it a test.  You don't have to fly it to test it!!!

Linn

do not archive



 	  Quote: 	
		  

Thank You

Ray Doerr

N519RV 40250 (Hobbs=323)

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john_rv10(at)yahoo.com
Guest

Posted: Mon Oct 15, 2007 11:42 am Post subject: Dual Radio's using the Split Com feature.

Ray,



Please see the attached comments from the GNS 430W installation manual re

mandatory use of the TX interlock and placement of com antennas.



Cheers,

John Cleary



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