Read the description carefully. On the C39, the 40 DE is BETWEEN the 15 DE and
the 15 reflector, NOT behind the 15 reflector.
They HAVE had to deal with removing the 21 mhz resonance from the 40 "N"
elements. The diagram is at home, but the distance from the 40 DE to the 15 DE
on the same boom is a LOT less than the vertical mast separation the original
poster proposed between the separate antennas.
>
> From: n4kg@juno.com
To: <towertalk@contesting.com>
> Date: 2001/01/30 Tue PM 11:51:25 EST
> To: TOWERTALK@contesting.com
> Subject: Re: [TowerTalk] Shadowing of small antennas by larger ones?
>
> You can put lower frequency elements BEHIND higher frequency
> elements because the high frequency reflectors isolate other
> elements to the rear.
>
> That is NOT the case for vertical separation where the lower
> frequency elements are symmetrical about the mast as are the
> higher frequency elements on the triband antenna.
>
> de Tom N4KG
>
> On Tue, 30 Jan 2001 "Guy Olinger, K2AV" <k2av@contesting.com> writes:
> > You realize, of course, that you can buy those two antennas on the
> > same
> > boom, the C39XRN. The 40m driven element is between the 10 m
> > reflector
> > and the 15 meter reflector. 40m reflector is way out back.
> >
> > If they can put them on the same boom with NO vertical separation,
> > I'm sure it's no big deal to put them on the same mast. You can remove
> > that
> > one from your worry closet and spend your worry time on something
> > more productive.
> >
> > Good Luck with it and 73,
> >
> > Guy.
> > -----------------
> >
> > Guy Olinger, K2AV
> > Apex, NC, USA
> >
> > ----- Original Message -----
> > From: Eugene Jensen <eugenejensen@nyc.rr.com>
> > To: <towertalk@contesting.com>
> > Sent: Monday, January 29, 2001 10:38 PM
> > Subject: [TowerTalk] Shadowing of small antennas by larger ones?
> >
> >
> > > Force 12 C-19XR tribander, with a Force 12 240N 40-meter antenna
> > with
> > 12
> > > feet between them. How do think that would play out. I'm following
> > this with
> > > a lot of interest as in the spring I was planning on doing just
> > that.
> > Force
> > > 12 stated to me in a phone conservation they would not interact
> > with
> > one
> > > another. They will both be on a Telex 37 Crankup with 20 Foot
> > ChomeMoly
> > > 2inch Mast. Gene K2QWD
> > >
> > >
> > > --
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> > > Problems: owner-towertalk@contesting.com
> > >
> > >
> >
> >
> > --
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> > Submissions: towertalk@contesting.com
> > Administrative requests: towertalk-REQUEST@contesting.com
> > Problems: owner-towertalk@contesting.com
> >
>
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> FAQ on WWW: http://www.contesting.com/FAQ/towertalk
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>
>
>
--
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