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.
Keith
NM5G
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Gary Quinn
Sent: Tuesday, August 10, 2004 11:44 PM
To: towertalk@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.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
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.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|