[amsat-bb] Re: [PNWVHFS] 1.2ghz antenna location

[Edward Cole]

When stacking antennas  within the aperture of another then one 
should try to keep the lower frequency antenna out of the aperture of 
the higher frequency antenna.  Use the stacking dimension of the 1.2 
G antenna as minimum spacing.  If you do not know what that is then 
use half the boom length as min spacing.  I would use that also to 
keep the dish from affecting the pattern of the 1.2G antenna.

Another goal is to try not to place booms parallel to a member of the 
lower freq. antenna as this may cause coupling and distortion or 
detuning of the lower freq. antenna.  This would indicate that you 
should mount the 1.2G yagi pointing in the same direction as that 
places the boom perpendicular to the quad loops.

I think there is some info on stacking VHF antennas on the Directive 
Systems website.
73 Ed - KL7UW

At 10:51 PM 1/13/2008, w7lrd at comcast.net wrote:
>Hello
>I will be mounting my 22 el 1.2Ghz yagi "inside" my HF 20,15, &10 
>meter quad.  Has anyone tried something like this or even 
>similar?  If I mount it up near the top of the mast is might be 
>faily close to my 10M driven loop.  I also am considering mounting 
>it 90 degrees to the quad boom and just figure that in whe aiming 
>the short yagi.  So what would be the closest I want the yagi to be 
>to any of the HF wires?  Part of the space inside the quad is taken 
>up by a 3 foot primestar dish for 2.4 Ghz.  So the antenna placement 
>"up there " is getting a bit crowded.  I want to try not to degrade 
>1.2 or my HF suff.  The height will be about 50 feet.
>As Always- Thanks
>
>--
>73 Bob W7LRD
>"Somewhere, something incredible is waiting to be known"
>Carl Sagan
>
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73,
Ed - KL7UW
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