You mite want to ask the same folks who came up with the mod listed below.
----- Original Message -----
From: "Michael J.Talkington" <[EMAIL PROTECTED]>
To: <Repeater-Builder@yahoogroups.com>
Sent: Tuesday, July 27, 2004 10:04 AM
Subject: [Repeater-Builder] Re: Fw: How to modify DB 212 for 6 meters
>
> I want to know how to make the harness for two of these.Also would
> like to find out how to make one for four of the db-212 cut for six
> meters.What are the formulas thanks Mike KC8FWD
>
>
> --- In Repeater-Builder@yahoogroups.com, "John J. Riddell"
> <[EMAIL PROTECTED]> wrote:
> > The following was received after a request to Cook Towers about
> retuning a DB-212 antenna that i have which
> > is presently on 42 Mhz.
> >
> > John VE3AMZ Waterloo Ontario.
> >
> >
> > ----- Original Message -----
> > From: [EMAIL PROTECTED]
> >
> > Sent: Tuesday, July 27, 2004 9:42 AM
> > Subject: How to modify DB 212 for 6 meters
> >
> >
> > Six meter mod for the DB-212
> > Real gain for six meters (DBd)
> >
> >
> > For the DB-212, you would just measure the current length of the
> dipole and
> > then multiply this length by (current_freq/new-freq). So if the
> current
> > length is 180" and the current freq is 50 and you want to go to
> 53.5 MHz.
> > The new length is 180*(50/53.5) in inches.
> >
> > To change the length you will need to remove the pop-rivet and a
> little
> > dimple that the tuner uses to hold the trombone in place until
> production
> > can install the rivet.
> >
> > Sometimes the vswr depends on the tower face. If you want to super
> tune the
> > antenna, do the following. Set the antenna up on a tower leg a few
> feet off
> > the ground. Then free the trombone, put it at the length you want.
> Next
> > check the refected. Then get some long stick and start moving the
> trombone
> > while watching the refelcted. When you get the best possible vswr,
> redo the
> > rivets.
> >
> > This has been tested here in our shop
> > and it works well!
> >
> > Cook Towers, INC.
> > Toll Free (877)992-2665
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
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