FWIW .... I ran a stack of the older Cushcraft 2 element 40M yagis at 70
and 140 feet for more than 25 years. They were great. I have replaced
them with a pair of 2 element Moxons at 75 and 145 feet. They are much
better and the SWR bandwidth is excellent.... roughly less than 1.5:1 from
7.0 to 7.25. It is less than 2:1 at 7.3.
I also adjusted the old stack to cover 7.0 to 7.15. I don't do any mode
other than CW.
I did the design of the Moxons and used leftover booms and elements from an
old stack of Telrex.
At the same time I put a full size 40m dipole at 100 feet and have verified
with A/B comparison, that the Moxons are performing as expected .
This only anecdotal data, but I am satisfied with my antennas.
73,
Dave, K4TO
On Thu, Nov 5, 2020, 11:02 AM k7lxc--- via TowerTalk <
towertalk@contesting.com> 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
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|