Steve is right on the short stack. I run a set of the JK402T here -
which is the Moxon-like thing JK makes - at 70 & 140'. Works pretty good
and has nice BW & good F/B compared to what you would expect from a
conventional stubby 2-element.
A pair of 2-element on 40m makes a lot of sense here in the midwest
because keeping up a full sized 40m beam given our tornado alley
location, frequent high wind and the occasional ice conditions a serious
challenge. Plus a big beam means bigger rotor & tower are additional
and needed to hold it up and hold it in place. It's all been up now for
3 years and has not broke yet which is great! And I manage to catch a
bit of DX and contest luck despite not having the full sized 3-4 element
big boy running here.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 11/5/20 10:01 AM, k7lxc--- via TowerTalk wrote:
Howdy, TowerTalkians - These comments pertain to the 402CD but I suspect they'll be the same for the XM-240.
Split the difference between CW and MID settings and your 2:1 points will be 7.000 and 7.250. These are the Secret LXC Dimensions
BTW. As for a 2-stack, that's always been my economical killer 40M stack. I never built it but the performance should be
better than a single full sized 3L 40M beam when you consider the choice of angles and headings plus thousands of $$ less. May the force be
with you! Cheers,Steve K7LXC
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