As for 80m yagis, as far as I recall Titanex sells (among new products) so
called "motor driven" 80m and 40m 2 el yagis. I think they use the same
approach as SteppIr, but don't know any details except I saw pics and prices
at their web site.
Mirko, S57AD
----- Original Message -----
From: Michael Tope <W4EF@dellroy.com>
To: Al Williams <alwilliams@olywa.net>; towertalk <towertalk@contesting.com>
Sent: Thursday, October 07, 2004 7:39 PM
Subject: Re: [TowerTalk] 2 element 40m steppir yagi
> What I was thinking about for my small suburban lot was a
> big IR driven element attached to a mast pipe in concert
> with a single regular IR parasitic element cantilevered on a
> short boom off the mast. This would give 2 element yagi
> performance on 13.8 to 54 MHz and rotary dipole performance
> on 6.9 to 13.8 MHz, and still be reasonably "neighbor friendly".
> The big IR driven element could be grounded to the mast with
> a relay and used as tuneable top loading for a 160 meter
> shunt-fed tower. For eighty meters I would probably just use
> an inverted-vee.
>
> As far as 80 meter yagi's go, I think the hot ticket would be
> a center loaded element with small_IR element halves installed
> beyond the center loading to serve as a continuously adjustable
> elements tip. The IR element tips could then be adjusted from
> the ground for optimized yagi performance from 3.5 to 4.0 MHz.
> Getting the control wiring past the inductor might be a
> challenge (you might be able to put it inside the coil tubing).
>
> 73 de Mike, W4EF......................................
>
>
>
> ----- Original Message -----
> From: "Al Williams" <alwilliams@olywa.net>
> To: "towertalk" <towertalk@contesting.com>
> Sent: Thursday, October 07, 2004 9:51 AM
> Subject: [TowerTalk] 2 element 40m steppir yagi
>
>
> > I thank those that responded to my suggestion of a possible 80 meter
> > steppir. The difficulties that loaded (linear or coil) elements would
> > result never occurred to me. Perhaps that was because Force12 used to
> > have a shortened element 80/40 meter yagi using linear loaded
> > wires in there catalog.
> >
> > I wish I could thank those that responded to my other suggestion of a
> > possible 2 element steppir as a modification of the already existing 4
> > element 40 thru 6 meter steppir yagi. Not one response, yet there were
> > 8 postings concerning the price (~$15/20) of a 500 foot roll of wire.
> > Unbelievable! Maybe my suggestion was inadequately expressed?
> >
> > I assume that all Towertalkians are familiar with the Steppir yagi
> > design, but maybe not their Monster model. It is a huge Yagi. Huge in
> > price, weight, windload, and difficult( ?) erecting on the tower. But
> > it is also huge in directivity gain, 40 thru 10 meter coverage with low
> > SWR.
> > Although some might argue that a 2 element yagi is better for some
> > contesting because of the wider azimuth angle gain, I suspect that most
> > would rather have the 4 element if their tower and pocketbook could
> > accommodate it?
> >
> > For the rest of us, my proposed 2 element would have the weight and
> > windload specs that would allow it to be installed on the heavier
> > duty crankup towers and maybe even on a steel Martin tower and Hazer.
> > Although the directivity gain would be less, it would still be
> > worthwhile considering the inclusion of the 40, 30 meter bands along
> > with shortwave broadcasting for those interested. The price would also
> > make it more affordable. Perhaps most important the 2 element yagi
> > could be easily installed on the tower by tilting the tower down and
> > rotating the boom 180 degrees to install the elements while standing on
> > the ground--or lowering the Hazer. No climbing towers, stepladders,
> > cranes, etc.
> >
> > Have I totally misjudged Towertalkians interest?
> >
> > k7puc
> >
> > _______________________________________________
> >
> > 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
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
>
>
> _______________________________________________
>
> 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
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
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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