If I recall, they charge over $500 for that 40M vertical. Yikes!
We need a homebrew version. How difficult/expensive could it be to
fashion something similar?
73,
Barry N1EU
On 7/12/05, Fred Handscombe <fredch@homeshack.freeserve.co.uk> wrote:
> They have a very good web page
>
> http://force12inc.com/sigma40info-003.htm
>
> 73 FRed
> G4BWP
>
> ----- Original Message -----
> From: "NJ0IP" <Rick@DJ0IP.de>
> To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
> Sent: Tuesday, July 12, 2005 8:22 AM
> Subject: Re: [TenTec] Force 12 vertical dipoles used with my TT Scout
>
>
> > Thanks for the description Stuart.
> > Actually I'm only looking for a 40m monobander.
> > I believe they build those too.
> > I really don't want to run a control wire to the darn thing because it
> > will
> > be located quite some ways away from the house. The feedline will be
> > going
> > thru a remote coax switch and the control for the switch runs over the
> > feedline, so I can't run antenna control through the coax. It would have
> > to
> > be an extra cable.
> >
> > I guess I'll write Force12 directly and ask them to describe their 40m
> > version in more detail.
> >
> > Tnx agn.
> > Rick
> >
> > -----Original Message-----
> > From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
> > On Behalf Of Stuart Rohre
> > Sent: Monday, July 11, 2005 4:27 PM
> > To: Discussion of Ten-Tec Equipment
> > Subject: Re: [TenTec] Force 12 vertical dipoles used with my TT Scout
> >
> > We have several of the center fed Force 12 verticals of the Sigma V class
> > for a project at work.
> >
> > They were also used for a ham operating event on the bands 20m and up.
> >
> > They work great, are very easy to use and can be put up very fast.
> > Assembly
> > is speeded by the use of wing nuts.
> >
> > Our models did condense salt water overnight at the beachside test site.
> >
> > That is easily removed from the "radome' covering the loading coils,
> > relays
> > and centerfeed point by drilling a weep hole in the bottom of the cover
> > housing. In sustained salt water atmosphere you would have to rinse out
> > the
> > housing with fresh water, but this is commonly done with other commercial
> > antennas in seaborne service.
> >
> > They are very good shortened dipoles, using a combination of center
> > loading
> > coils and horizontal rod capacity hats to resonate the 12 foot length as a
> > 20m dipole. The furnished control cable to the relay switch box is 50
> > feet,
> > so you might have to add some for other installations.
> >
> > The coax feeder has ferrite beads over it at the feedpoint end to remove
> > any
> > chance of RF on the outer shield back at the rig.
> >
> > -Stuart
> > K5KVH
> >
> >
> >
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> >
> >
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> >
>
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