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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