[TowerTalk] Tribander Spacing

[Bill via TowerTalk]

Agreed it runs into trouble with spacings less than .5  wavelength.  
However, I have found that performance in the real world seems  to be on the money 
for spacings greater than .5.
 
Bill K4XS
 
In a message dated 2/21/2015 12:40:49 A.M. Coordinated Universal Tim,  
xdavid at cis-broadband.com writes:



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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