[TowerTalk] 204BA boom resonance, problem for 40 or not ?

[k2qmf at juno.com]

I have a 204BA at 70 feet and a Cushcraft 40-2CD at 80 feet on the same
mast!

No interaction at all!

73,
Ted  K2QMF

On Tue, 12 Aug 2014 21:57:24 -0700 Marko L Myllymaki
<marko.l.myllymaki at gmail.com> writes:
> Hi,
> 
> Would anyone have any insight to offer on this or real life 
> experience of
> this combination you could share:
> 
> I know some of the tribander booms+end elements  such as KT36XA 
> with
> non-insulated elements can resonate on 40 meters and so messing up 
> with 40 m
> yagi if mounted on same mast nearby.  There was great article of 
> this in NCJ
> while back.  KT36XA boom is 32 ft long. 
> 
> Does anyone have insight if same issue happens with 204BA with its
> non-insulated elements and 26 ft long boom, or does its 
> boom+elements
> resonace fall outside of 40 m band ?   Is there someone who has 
> modeled this
> ?
> 
> If tribander boom+end elements resonance actually does fall on 40 m 
> band,
> then is this even problem if booms of 40 m and tribander are 
> aligned, or
> would it be problem only if antennas are 90 degrees off each others 
> ?  Have
> heard various opinions on this and I don't have yet my own 
> experience on
> some of these things.
> 
>  
> 
> I'm considering what combination I will put on one of the 2 towers.  
> Current
> plan is now to have M2 40M3L linear loaded yagi at the bottom of 
> mast, then
> maybe around 8 ft above that 204BA and some 15 m yagi another few 
> feet above
> 20 m.  Booms of 40 and 20 would point same direction and 15 at the 
> top would
> be 90 degrees off in order to minimize coupling between 40 and 15 m
> antennas.
> 
> I have 40M3L already in my possession, but I'm trying to decide what 
> to do
> with 20 and 15 on that tower.  There are other possibilities, but 
> above is
> what I'm currently considering.
> 
>  
> 
> Need to decide path to proceed fairly soon, and I'm not planning to 
> start
> learning modeling SW right now.
> 
> I would very much appreciate any insight and experience on this 
> combination.
> 
> 73 de Marko N5ZO
> 
>  
> 
> _______________________________________________
> 
> 
> 
> ____________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
> 

____________________________________________________________
The #1 Worst Carb Ever?
Click to Learn #1 Carb that Kills Your Blood Sugar (Don't Eat This!)
http://thirdpartyoffers.juno.com/TGL3141/53ebb80353d41380349e5st01vuc