[Antennas] Cubical Quad Question

Fri Mar 26 11:31:20 EDT 2010

Hello,
This is directed to any quad guru's out there!
I have a 5 band 20 through 10 meter cubical quad. Actually is a GEM quad
that I've added a small boom to increase the spacing a bit. 
Each band is fed out of an antenna switch on the mast through a 1/4 75 ohm
matching transformer. 
I have always had trouble with 10 and 12 meters resonanting properly. I
recently re-strung both 10 and 12 driven and reflectors with the exact
demensions call for 1005/f driven and 1030/f reflector. 
As long as I keep the 10 meter reflector disconnected 12 resonants fine
right where it suppose to but when I connect the 10 meter reflector it
totally changes the resonanting frequencing buy a large margin and the dip
is unacceptable.
How can I get 10 and 12 to co-habitate. It seems that the 10 meter
reflector is coupling with the 12 meter throwing things off. 
This may be a difficult situation with 12 meters at 24.900 and 10 meters at
28.300 how to keep them from coupling with each other. The 12/10 loops are
physically close to each other on fiberglass arms.
Any idea's to keep these guys from skewing each other off of the intended
resonant frequency?
Thanks,
Randy
WX5L

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