[TowerTalk] Cushcraft XM240

Keith Dutson kjdutson at earthlink.net
Wed Aug 11 09:33:54 EDT 2004

I would not do it for two reasons.

1. Modeling this antenna to avoid f/b problems on 40 is quite complex.

2. The boom is likely not up to the task of additional wind loading.

I would add another boom below the 40.  Design your own dual bander or get a
good multi-monobander like the F12 5BA or XR-5 that covers both 20 and 17.
I think you will need at least 10 feet separation between the two booms for
optimum performance.


-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Gary Quinn
Sent: Tuesday, August 10, 2004 11:44 PM
To: towertalk at contesting.com
Subject: [TowerTalk] Cushcraft XM240

Is it possible to add 20m or 17m fullsize elements and interlace them on the
same boom as the  Cushcraft XM240 40meter yagi.( ie. 2 on 40 , 2 on 20 and 2
on 17)  Would this yeald major interaction problems creating/modeling  this
tribander ?

thanks    Gary  VA7YO

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.

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