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[TowerTalk] 402-CD vs. EF-240X

To: <>
Subject: [TowerTalk] 402-CD vs. EF-240X
From: (Tyler Stewart)
Date: Wed, 29 Apr 1998 21:02:18 +0100
I think the main reason to do it is to make it less likely to have
interactions with other antennas, etc., on the tower.  It's usually not a
problem, but it can be and insulating the element makes it a lot easier to
predict any
possible problem.

Yeah, you might pick up some extra precip static by doing it, but then it's
time for a RX antenna anyway.

73, Ty K3MM
-----Original Message-----
From: Kenneth D. Grimm <>
To: <>
To: <>
Date: Wednesday, April 29, 1998 18:29
Subject: Re: [TowerTalk] 402-CD vs. EF-240X

>>It's the same electrical design with a lot of
>> hardware improvements including 90-100 mph wind rating, phillystran truss,
>> insulated reflector (using the same hardware pictured in the X7/X9 ads),
>> and a balun.
>This comment got me to wondering what the advantages of insulated
>parasitic elements on a beam are.  Tom, of Force 12, whose antennas use
>insulated parasitic elements on yagis once commented that if you
>believed that by removing the insulation and directly grounding the
>elements to the boom, in plumber's delight fashion, would produce a
>quieter antenna, then go ahead and do it.  My question is, why have
>antenna designers decided to insulate anything other than the driven
>element in the first place?  Has anyone actually bothered to test the
>idea that grounding the elements of a yagi produce a "quieter" antenna
>than one with the parasitic elements insulated?
>Ken K4XL
>Boatanchor Manual Archive -
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