What broadcasters do to get the best pattern on a
large tower is to mount the antenna on the leg coming
straignt off the leg. (perpendicular with the opposite
face)
Paul
--- Roger White <[EMAIL PROTECTED]> wrote:
> Ok, many thanks. I do not have the old catalog and
> remember something about
> the orientation of the dipoles toward the tower.
> But, I imagine since this
> tower is so wide, it will affect the pattern no
> matter what, but the site
> has cheap rent :), so beggars can't be choosers!
>
> 73,
> Roger
> ----- Original Message -----
> From: "Eric Lemmon" <[EMAIL PROTECTED]>
> To: <Repeater-Builder@yahoogroups.com>
> Sent: Monday, November 28, 2005 8:31 PM
> Subject: Re: [Repeater-Builder] DB 224 Antenna
> Orientation on a large (?25
> ft.) faced tower
>
>
> > Roger,
> >
> > My Decibel Products catalog shows that a DB224E-JJ
> antenna can achieve
> > nearly omnidirectional coverage when side-mounted
> on a tower with a DB5001
> > Side Mount Kit, with all dipoles pointing inward
> toward the tower. This
> > kit positions the antenna mast 18 inches away from
> the tower. Other
> > spacings will probably affect the pattern
> significantly.
> >
> > 73, Eric Lemmon WB6FLY
> >
> > Roger White wrote:
> >
> >> I am going to put up a Andrews dB224JJ (220 MHz
> antenna) on our tower
> >> at TI in Dallas. I have had an antenna on this
> tower up at 250-270 ft.
> >> for many years (a 6dB Stationmaster for 145 MHz
> and a 6dB Stationmaster
> >> for 224 MHz). Our 2 meter antenna is now a dB224,
> with the dipoles
> >> situated around the antenna mast as if for a top
> of the tower mount
> >> with an omni pattern. The 220 antena is an anemic
> 3 dB gain Antenx,
> >> which is not much better than a wet noodle with
> some gain.
> >>
> >> I seem to remember somewhere (maybe an old dB
> Products catalog) where
> >> for an antenna of the dB224, if you face all four
> dipoles toward the
> >> tower, you stand a chance of getting s more omni
> pattern (at least it
> >> is suppose to have somewhat equal gain ripple
> around the tower). The
> >> tower is 25 ft. wide on each face. The antenna
> will be offset from one
> >> leg around 5 to 6 feet at least.
> >>
> >> Does anyone have any experience in mounting this
> type of antenna in
> >> this manner?
> >>
> >> Roger W5RD
> >>
> >>
> >> Yahoo! Groups Links
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
> [EMAIL PROTECTED]
>
>
>
>
>
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