I concur with Dave's post. A high-Q loading coil is the best way to shorten
a 40m element. The OptiBeam has a massive high-Q loading coil and the
antenna performance is excellent. The OB2-40 is well made, no strengthening
modifications are needed, and it is easy to assemble and adjust for
resonance.
John KK9A / P40A
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Force 12 Delta 240 2 Elem 40M Yagi
From: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 12 Apr 2014 21:03:11 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I do believe that the coil loaded Shorty 40's (F12 or other) are a much
better choice than the linear loaded versions. I think that W8JI wrote a
piece on that once ... maybe it's even on his website. I have the Optibeam
OB2-40, which is a coil loaded Shorty 40 similar to the F12 antenna except
much sturdier, and it works great (yes, I've measured the pattern).
73,
Dave AB7E
On 4/12/2014 1:24 PM, K7LXC@aol.com wrote:
Does anyone have a Force 12 Delta 240 up in the air in use? If so, how
does it play?
I've installed a number of the F12 linear loaded antennas and NO ONE
has ever said to me that it was a 'great' antenna. I've always thought that
the CC 2L shorty forty is the best bang for the buck on 40M. Maybe the
newer F12 versions with coils would be an improvement.
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for amateurs
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