Geeeze Loueeeze!

 

When I bought a Comant switch in the early nineties it was only $300.  Now I'll have to raise the hull insurance on my airplane.

 

Grayhawk

 

Dean,

It is possible to use a single comm antenna but it takes something like this:

http://www.aircraftspruce.com/catalog/avpages/comantswtich601.php

It's not a very common installation and it's a lot more expensive than a second antenna!

My layman's understanding is that transmissions from one radio become over-powered receptions to the other radio.  So most commonly, two comms each use a dedicated antenna.

On a Legacy, the second antenna can go aft of the primary.  It needs to be centered a minimum of two antenna lengths from the other comm antenna.  That makes it a challenge to use a straight antenna as it may hit the ground before the tail tie-down.  We've put an antenna in that area, and we may have ended up using a bent whip like a Comant CI-122.

Nav antennas can be split without worry.

Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell

On Fri, Dec 30, 2011 at 9:07 AM, Dean Whiting <dean.whiting@gmail.com> wrote:

I was looking for some advice about communication antennas.  The legacy is setup to have one com antenna.  We want a capable IFR airplane and I am hesitant to have one antenna with a diplexer (or is it duplexer, I've seen it both ways) as a possible single point of failure.  Is this the method that most people are using?  If you mounted a 2nd com antenna, where did you place it?  I searched the archives and found someone else who asked the same question but I couldn't find the answer.  Any other input or advice on the subject would be appreciated.

Dean Whiting

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