[Antennas] Cubical Quad Question

[JK]

Hi Randy,

Interlaced antenna elements are always a compromise as compared with a 
single band antenna sys. Esp with effects on Max F/B.

Since disconnecting the 10M refl. makes the 12 meter SWR problem  go away, 
you should figure out hw to automatically
disconnect that 10 M ref when you operate on 10M.

Exactly hw did you "Disconnect" the 10M refl in your experimenting? Did you 
try opening the 10M reflector so it was not a closed loop and then see hw 
that affected the 10M SWR?

Jay   NE2Q


On 3/26/2010 11:31 AM, wx5l at charter.net wrote:
> 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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