Re: [Repeater-Builder] DB264-A vs -C dimensions

31 Oct 2004 15:43:18 -0000

Changing the spacing between elements will change the angle the signal radiates at slightly.  Usually done to bring the signal down further.
Paul Guello, kb9wlc
 
Paul Kelley <[EMAIL PROTECTED]> wrote:

Thanks Chuck,

I have seen you mention that rule of thumb before. In this
case the manufacturer seems to have used 0.78 between the
bottom dipole and the top set, and 0.85 between the middle
ones... probably a compromise to make the harness fit --
it's inside the mast on this model.

Paul


On Saturday 30 October 2004 04:29 pm, Chuck Kelsey wrote:
> Between 0.85 to 0.95 wavelength, center to center.
>
> Chuck
> WB2EDV
>
>
>
> ----- Original Message -----
> From: "Paul Kelley" <[EMAIL PROTECTED]>
> To:
> Sent: Saturday, October 30, 2004 3:46 PM
> Subject: [Repeater-Builder] DB264-A vs -C dimensions
>
> > OK, I know the major response to this is going to be
> > "forget it and buy the right antenna"..... but I will
> > blunder in and ask this anyway.
> >
> > Question: does anyone know the center to center dipole
> > spacing for a DB264-A (150 - 160 MHz) antenna?
> >
> >
> >
> > I'm trying to evaluate whether it is feasible to modify
> > a DB264-C (164-174 MHz) to the 2 meter ham band. I need
> > to figure out how many things would have to be
> > changed...
> >
> > Obviously the dipoles would have to be lengthened.
> > That's NOT a problem... (I have someone who can weld in
> > some sections to "properly" extend them).
> >
> > I will have to make up a custom phasing harness, as
> > they apparently don't make a version of this antenna
> > for the ham band. I guess I can handle this... but a
> > longer harness implies the dipole spacing will have to
> > change in order to cram the new harness inside the
> > mast...???
> >
> > I looked up the physical specs and found the mast is
> > the same length (258") for the A, B, and C ranges. So I
> > may be able to drill some new holes, plug some old ones
> > and get away with it. I'd like to know for certain if
> > they used wider spacing before I dig too far into this.
> > I'm about to disassemble the antenna and see what the
> > phasing harness consists of (hopefully the coax has
> > meaningful numbers on it)
> >
> > Thanks,
> >
> > Paul N1BUG
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
>
> Yahoo! Groups Links
>
>
>

--
Paul Kelley
Aurora Sentry - http://www.aurora.n1bug.net/
N1BUG Web - http://www.n1bug.net/






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