[TowerTalk] Tribander Spacing

[Keith Dutson]

Thanks Pete.  Your spacing is only 28 feet, less than a half wavelength on
20.  I also had a recommendation of 5/8 wavelength on 20.  That calculates
to 41 feet.  I was thinking 35 feet.  Guess I need to put it in HFTA to see.

73, Keith NM5G

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Pete
Smith N4ZR
Sent: Friday, February 20, 2015 2:57 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Tribander Spacing

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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