[TowerTalk] 40m beam / interactions

[corneliuspaul at gmx.net]

Hello,

if you are talking about interactions between 40m and higher bands
(15m is worst, 20m is much less affected, 10m is no problem most of the 
times),
in my opinion it is not important which brand of 40m antenna you buy.

It is the simple laws of physics (2nd harmonic, 3rd harmonic, etc.),
has nothing to do with any brand.

when talking about the highband beam, things might be a bit different.
Depending on the type of design (heavily or loosely coupled parasitic
elements, traps or no traps, all driven (lpda) or yagi/uda style)
one design will react more critical to nearby objects (antennas or other
metallic objects) while others might be more tolerant.

At least that is how I understand it.

73,
Con DF4SA



At 12:30 16.04.2004, you wrote:
>Interaction was my concern too when selecting a 40M beam since it would be
>on the same mast as a tribander. I decided on the Force 12 MAG240N since it
>doesn't have a resonance in any other band. Went together easy. Followed the
>instructions for tuning each element. Seems to work fine.
>N2TK, Tony
>
>-----Original Message-----
>From: towertalk-bounces at contesting.com
>[mailto:towertalk-bounces at contesting.com]On Behalf Of Mike Fatchett
>Sent: Thursday, April 15, 2004 11:00 PM
>To: towertalk at contesting.com
>Subject: [TowerTalk] 40m beam
>
>
>I am looking for suggestions or comments on 2 ele 40m beams.
>
>I am going to be putting up a Trylon 64ft self supporting tower with a
>SteppIR 4 ele beam and would like a reasonable 40m beam.
>
>Interaction is a concern.
>
>I have heard good and bad things about the "new" Cushcraft xm240.  I have
>seen nothing on the Hy-gain Discoverer 72 and have hesitations because of
>the ownership.  The Optibeams look interesting but are sure pricey.  The
>Force 12 Mag 240 might be a player too.  I work phone and cw.
>
>Any comments greatly appreciated.
>
>Mike
>W0MU
>
>_______________________________________________
>
>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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>
>_______________________________________________
>
>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
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