[Antennas] Re: Antennas Digest, Vol 11, Issue 17

[W0OXJ]

I believe since you are using balanced feed line and will, of course, use a
tuner this problem will be taken care of by the tuner.I would make my
radials the same length as the radiator to keep the antenna balanced.It
should work just fine.

Good Luck,
Bob
W0OXJ
----- Original Message ----- 
From: <antennas-request at mailman.qth.net>
To: <antennas at mailman.qth.net>
Sent: Friday, December 31, 2004 2:00 AM
Subject: Antennas Digest, Vol 11, Issue 17


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> Today's Topics:
>
>    1. top hat for vertical (fkamp at comcast.net)
>    2. Re: top hat for vertical (Richard Brunner)
>    3. Re: top hat for vertical (Harvey&Bessie)
>    4. Re: top hat for vertical (DavidE Benedict)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 30 Dec 2004 10:44:27 -0600
> From: fkamp at comcast.net
> Subject: [Antennas] top hat for vertical
> To: "antennas at mailman.qth.net" <antennas at mailman.qth.net>
> Message-ID: <41D4306B.3E9966C1 at comcast.net>
> Content-Type: text/plain; charset=us-ascii
>
> I have a little query that someone with more experience might be able to
> answer and save me some time.
>
> I am putting up a vertical to cover, mainly, 30 meters.  Got about 26
> feet of aluminum tubing.  I intend to mount it on the roof, base about
> 20 feet above ground level.  I will be using open wire line and four
> radials so I can use it on other frequencies with a tuner.
>
> I can put it up as a self supporting structure but the winds here can be
> pretty strong.  I doubt it would survive one season being self
> supported.
>
> I am planning on guying it at its 13 foot level.
>
> I can guy it with insulated line, or I can use a set of wires to act as
> a top hat at the guying point.
>
> Most top hats I have seen are installed at the top of the vertical, but
> that is not the optimum guying location.
>
> So I am wondering how effective a 'top hat' would be if it is located
> half way up the vertical.  Any loading that will allow me to reduce the
> height of the vertical would be welcome.  I just dont have a feel for
> how much height I can sacrifice with a 'top hat' located at the center
> of the antenna.
>
> Any suggestions?
>
> Regards,
> Frank Kamp
> K5DKZ
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 30 Dec 2004 17:51:19 -0500
> From: "Richard Brunner" <rbrunner at gis.net>
> Subject: Re: [Antennas] top hat for vertical
> To: <antennas at mailman.qth.net>
> Message-ID: <029701c4eec2$2d63d540$97c807cf at richardb>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Re:
> > So I am wondering how effective a 'top hat' would be if it is located
> > half way up the vertical.  Any loading that will allow me to reduce the
> > height of the vertical would be welcome.  I just don't have a feel for
> > how much height I can sacrifice with a 'top hat' located at the center
> > of the antenna.
>
> I believe top loading anywhere than the top is detrimental, because
antenna
> current that would be going the whole length of the antenna will be
diverted
> to the loading wires, reducing effective height, radiation, and
efficiency.
>
> Richard Brunner, AA1P
>
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 30 Dec 2004 21:20:20 -0800
> From: Harvey&Bessie <w4tg at bellsouth.net>
> Subject: Re: [Antennas] top hat for vertical
> To: Richard Brunner <rbrunner at gis.net>
> Cc: antennas at mailman.qth.net
> Message-ID: <41D4E194.6000208 at bellsouth.net>
> Content-Type: text/plain; charset=us-ascii; format=flowed
>
> I agree with Richard. There would be no advantage to such an arrangement
and certainly
> some disadvantages
> Harvey
> W4TG
>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Thu, 30 Dec 2004 22:01:06 -0800
> From: iam at pmug.org (DavidE Benedict)
> Subject: Re: [Antennas] top hat for vertical
> To: fkamp at comcast.net
> Cc: antennas at mailman.qth.net
> Message-ID: <fc.003d094101df66f23b9aca006b5969b7.1df66f4 at pmug.org>
> Content-Type: text/plain; charset=ISO-8859-1
>
>
> Maybe use a plastic guy-ring (or some other structural-type insulator
> material) at your 13 foot level, and place the top-hat at the top as would
> be best. The guy-ring wouldn't have to be more than 4-6 inches or so in
> diameter.
>
> David
> w7dbh, Oregon
>
>
>
> ------------------------------
>
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> End of Antennas Digest, Vol 11, Issue 17
> ****************************************