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Europa-List: transponder antenna wiring

Subject: Europa-List: transponder antenna wiring
From: Fred Klein <fklein@orcasonline.com>
Date: Sat, 14 Mar 2009 18:22:02

Hi All,

I'm in the midst of locating antennae and attempting to zero in on  
avionics selection.

I find in the Garmin Installation Manual for their 320A transponder a  
max. length for the RG-400 coax to be 8.8 feet, 12.5 feet for RG304 (a  
coax which I've yet to see for sale anywhere, and 17.0 feet for "ECS  
Type 311601 sold by Electronic Cable Specialists in Wisconsin (again,  
a product which I haven't seen in any of our wiring discussions). This  
may be a moot point as I expect to use the Narco 165 (Value Series, to  
save a few bucks [unless the consensus might be that doing so would be  
pennywise/pound foolish].) I can't seem to find a downloadable  
installation manual for the Narco, so I'm not sure that Garmin's 8.8  
foot max would still apply.

On our forum, I've only found folks using RG-400. I don't see how I  
can get the distance down to an 8.8 foot run from antenna to the  
panel, unless I bring the transponder antenna forward to just aft of  
the baggage bay (close to strobe power supply; however, it seems many  
guys have put the transponder as far aft as possible abeam the rear  
bulkhead.

Any advice and counsel to this electronic neophyte would be much  
appreciated...don't want to get anal, but don't want to create  
problems either,

Thanks,

Fred



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