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2 element, 5-band Gem Quad (10, 12, 15, 17, 20M)

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Subject: 2 element, 5-band Gem Quad (10, 12, 15, 17, 20M)
From: (jim funk)
Date: Fri, 7 Jun 1996 09:46:42 -0500
        The following request for info comes from Tom NU7J who is not 
on-line yet.  Please reply to my e-mail address and I'll forward to him by 
snail mail.  Will also summarize for the reflector if there's enough 
                                        73, Jim N9JF

I'm  looking for recommendations, ideas, etc. regarding the best way to feed 
a 5-band, 2 element Gem Quad.

I currently am feeding all 5 bands with a single, 50 ohm coax, through a 1:1 
balun.  The antenna works, but performance is not the best, and the SWR is 
high on 2 bands.  The antenna heighth is 65 feet.

I'm considering several schemes, such as: 

use 2 feedlines, one for 10, 12, 15, and one for 17, 20
use 3 feedlines, one for 10, 12, one for 15, 17, and one for 20
use 5 separate feedlines, one for each band

I'm also looking for recommendations regarding which type of balun to use: 
The Gem quad-supplied balun is a kit, consisting of wire and a toroid core.  
I was wondering if there are other baluns which may be more resistant to 
failures, weather, etc.

I'd appreciate hearing from others with experience with multi-band quads.

Thanks, Tom NU7J

Jim Funk - Amateur Radio N9JF 
Where the 160 antennas have Jersey "Cownterpoises"

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