[TowerTalk] Tribander Spacing

[David Gilbert]

HFTA is a poor judge of spacing.  There is a known flaw in the model, 
and it will overstate the stacked gain for narrow spacings.

73,
Dave   AB7E



On 2/20/2015 1:56 PM, Pete Smith N4ZR wrote:
> Assuming you meant a second C-3, I did extensive modeling of pairs of
> C-3s back in the late 90's when I put my stack up.  There was an NCJ
> article, but if you like I can try to dig up the manuscript here.
>
> I wound up with C-3Es at 97 and 69 feet. It's too wide for the best
> 10m pattern and not wide enough for optimum on 20, but it worked out
> to be the best overall compromise.  I would have put up a third
> antenna at around 35 feet, but the tower would have been marginal.
>
> Your case will depend on local terrain, and on take-off angle data for
> your part of the country. HFTA modeling will give you figures of merit
> for various paths that you can use to reach the best compromise, given
> your location and, perhaps, the prospects for 10M in the next cycle.
>
> 73, Pete N4ZR
> Check out the Reverse Beacon Network at
> http://reversebeacon.net,
> blog at reversebeacon.blogspot.com.
> For spots, please go to your favorite
> ARC V6 or VE7CC DX cluster node.
>
> On 2/20/2015 3:36 PM, Keith Dutson wrote:
>> I have a F-12 C3 up at 120 feet.  I want to add a second C-2.  What
>> would
>> you recommend for spacing?  QTH is Houston, TX area.  Thanks.
>>
>>
>> 73, Keith NM5G
>>
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