Subject: Dual Driven Element Quad
Back in the 80's or early 90's, I chatted with W6PU extensively about his dual
driven element quad. I had up a 5 element quad for 20 & 15M, 7 elements on 17
- 12 - & 10M on a 45 foot boom at the time. I did try his design but it was
very difficult to build due to different electrical spacing on the various
bands. The proper delay on 20M would be a different electrical wavelength for
each of the other bands. Also, the matching was much more difficult with his
arrangement. After about a month of trial and error, I went back to the normal
reflector- driven element - director arrangement. I couldn't really tell of
any improvement using his method. I have used phased arrays on 40M & 80M most
of my life but they have been two element systems utilizing a "T" Phasor in the
shack for getting the optimum phase shift. (ie. best front to back ratio). If
I would have used the "T" Phasor method rather than coaxial cable method for
phasing, I may have seen what it could do by optim
izing the proper phasing in the shack.
I will look into my antenna archive folders to see what info I might have from
W6PU tomorrow. If you are interested, I would be happy to copy the infor for
you. My Email address is w9jdj@hotmail.com and I would be more than happy to
share any of my experiences with phased antennas.
73 DE W9JDJ
> From: towertalk-request@contesting.com> Subject: TowerTalk Digest, Vol 61,
> Issue 5> To: towertalk@contesting.com> Date: Wed, 2 Jan 2008 12:00:40 -0500>
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> Today's Topics:> > 1. Re: Anyone everyone ever experiment making a DUAL
> driven Quad> ? Cebit talkes about a Fat wire design. (Joe Giacobello)> 2. Re:
> Force 12's Falcon J-6 (Pat Barthelow)> 3. AB577, AB621 (Jim Jarvis)> > >
> ----------------------------------------------------------------------> >
> Message: 1> Date: Tue, 01 Jan 2008 23:32:45 -0500> Fro
m: Joe Giacobello <k2xx@swva.net>> Subject: Re: [TowerTalk] Anyone everyone
ever experiment making a DUAL> driven Quad ? Cebit talkes about a Fat wire
design.> To: superberthaguy@verizon.net> Cc: 'KZ4USA' <videorov@verizon.net>,
towertalk@contesting.com> Message-ID: <477B13ED.3000406@swva.net>>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed> > If my memory
serves, it was W6PU. I worked him on 20M about two years > ago and we talked
about his design. I think, but am not certain, that > he is still using the
dual driven quad. I believe the article where he > discussed it in detail was
from an issue of CQ in the 80s. He also said > that he got a lot of static
regarding the underlying theoretical basis > for the design, but that it worked
for him and he swore by the > performance. Frankly, the details are vague in my
mind but I think the > design was based on the ZL Special.> > 73, Joe> K2XX> >
Scott W3TX wrote:> > Hi Jack,> >> > I've seen a design like this before.
It was developed by a W6. If my> > mind serves me correctly I believe that
K3ZO built one and perfected it.> > The original article by the W6 had a few
errors that ZO corrected> >> > 73, Scott W3TX> >> >
_______________________________________________> >> >> >> >
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http://lists.contesting.com/mailman/listinfo/towertalk> >> >> > > > > >
------------------------------> > Message: 2> Date: Tue, 1 Jan 2008 20:34:13
-0800> From: Pat Barthelow <aa6eg@hotmail.com>> Subject: Re: [TowerTalk] Force
12's Falcon J-6> To: Alain Michel <opalockamishabob@yahoo.com>,>
<towertalk@contesting.com>> Message-ID:
<BAY103-W41BF338E51A54B2A64F540FB520@phx.gbl>> Content-Type: text/plain;
charset="iso-8859-1"> > > Hello Alain,> > Welcome to the hobby. Lots of ways to
have fun. Whether you like a particular antenna or not, depends on what
pursuits you take up in your quest for fun and satisfaction i
n the hobby. Your G5RV can play just fine forever, depending on whether you
are looking for local or regional stateside contacts, or looking for long
range, DX contacts. The two pursuits favor quite different antennas. > This
reflector is a very good one, for answers to questions like yours> of how or
whether to mount masts or towers or other antenna supports to> buildings. > (or
any other antenna structure planning question.)> > 80 mph is serious wind, and
to mount a 30 ft mast> (actually, I hope you mean tower, such as Rohn 25, as
opposed to a> mast) in 80 mph is non trivial, and certainly far beyond a couple
of> u-bolts through the eaves; even a purpose built wall bracket needs>
substantial structural backing (engineering) before screwing it to a> side wall
of a house. So, to help you, many wizards, are accessible> here on Tower talk.
You just have to narrow down your goals, as you> begin your adventure in ham
radio, to ask the right questions.> > > If budgets, or space l
imit your options, and you are after DX, height is what you want to invest in,
if you have horizontal antennas. Try to get more than > 1/2 wavelength,
preferably 1 wavelength, which for 20 meters is around 60 ft.> If you had and
compared two rotatable dipoles, one at 30ft, and one at 60 ft, > and you were
listening for European Stations from California around sunset, or in the
morning, there would be a (probably) a profound difference in what you hear.
Once up at 50-60 ft or so, even simple wire antennas work DX very well.> > In
your case, being discreet, points possibly to a near-ground mounted vertical,
which finds the long range contacts much more easily, and through a totally
different mechanism than horizontal antennas.> > Welcome, and enjoy....> > All
the Best, 73,> Pat Barthelow aa6eg@hotmail.com> http://www.jamesburgdish.org>
Subscribe: http://bambi.net/jamesburg.html> Jamesburg Earth Station Moon Bounce
Team> > > > > > Date: Tue, 1 Jan 2008 19:46:12 -0800> > From: o
palockamishabob@yahoo.com> > To: towertalk@contesting.com> > Subject:
[TowerTalk] Force 12's Falcon J-6> > > > Hello All,> > > > I'm new to ham
radio. I'm very interested in hearing more about this rotatable dipole.
Currently, I've got a 204' G5RV "flat top" up about 35' and am pleased with
it's performance.> > > > I was wondering if anyone on this list [or knows
anyone who has one] can give me some reviews on how well it performs; EHAM
currently has zero. Current plans are being made to place it on a 20'-30' mast
and attach same to the eave on the east side of the house. A small tv antenna
rotator will take care of that chore.> > > > What is the best way to attach a
2" mast to the eave? We've lived here for over 10 years and the winds will gust
to 80 MPH. How should I [or should I?] guy the top 10' of the mast?> > > > My
wife and I have over three acres of property, but we are in a CC&R area. Most
neighbors don't look up, but there are one or two who might blow the whistle
if they even catch a glimpse of anything out of the ordinary. > > > > The east
side of the house is about 200' from the street, but any antenna up higher than
a 25' avocado tree is flirting with danger. I understand that the Falcon can be
painted; this is great news and may be necessary, in my case.> > > > Any help,
suggestions or recommendations will be most gratefully received. > > > > Many
thanks for taking the time to respond!> > > > Alan...KI6HPO> > > > > >
---------------------------------> > Never miss a thing. Make Yahoo your
homepage.> > _______________________________________________> > > > > > > >
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------------------------------> > Message: 3> Date: Wed, 02 Jan 2008 10:34:02
-0500> From: Jim Jarvis <jimjarvis@optonline.net>> Subject: [TowerTalk] AB577,
AB621> To: towertalk@contesting.com> Message-ID: <C
3A1191A.160A%jimjarvis@optonline.net>> Content-Type: text/plain;
charset=US-ASCII> > > > TT:> > I have found a source of some spare parts for
the military pushup masts> which some know as 'rocket launchers'. It is a small
company in NJ, which> specializes in short run work for the military, and has
been a supplier to> Ontario Surplus. > > Someone called me last week, looking
for ab577 guy rings. I didn't take> note of his call. This could be a source.>
> If folks think it's material, I'll post the company link. Else, msg me>
directly for info.> > 73/n2ea> > > > > ------------------------------> >
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http://lists.contesting.com/mailman/listinfo/towertalk> > > End of TowerTalk
Digest, Vol 61, Issue 5> ****************************************
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