[Antennas] Multiple dipole spacing

Mon, 12 Aug 2002 20:06:01 -0500

 get less noise on my 80 loop and comparable receive to the 80 dipole.

Tim Billingsley KD5CKP
http://www.qsl.net/kd5ckp/start.htm
----- Original Message -----
From: "Les Severson" <[email protected]>
To: "David W Sher" <[email protected]>
Cc: <[email protected]>; <[email protected]>
Sent: Monday, August 12, 2002 7:46 PM
Subject: Re: [Antennas] Multiple dipole spacing

> Amen to Dave's advice !   (W9LYA)
> A lot of grief and labor can be saved by feeding an 80m dipole with ladder
> line, tuner &
> balun for excellent all band results.   I personally  prefer a link
coupled
> tuner such as
> a Johnson matchbox which eliminates the need for a balun.
> "Try it... you'll like it"   hi
> 73,  Les,   W�OJH
>
>
> David W Sher wrote:
>
> > I have made several parallel dipoles, most recently a 40/80 using
> > ladder-line for the elements and a 20/40/80 with PVC tubing for spacing.
> > It has been my experience that the latter arrangement suffers from
> > flipping over on itself in a wind, potentially shorting out elements if
> > you are using bare wire, unless you restrain the lower elements with
> > additional guys.  The ladder line parallel works fine.
> >
> > Howevwer, why don't you save yourself grief by putting up a single
dipole
> > fed with open-wire or ladder-line, with a tuner at the transmitter end.
> > I found this a better deal all around.
> >
> > Dave          W9LYA
> > What wrought doG hath?
> >
> > On Mon, 12 Aug 2002 06:10:14 -0700 "R Goodspeed (W7DGX)"
> > <[email protected]> writes:
> > > Gentlemen,
> > >
> > > I want to build a multiple dipole arrangement with one single feed
> > > point, and the higher frequency dipoles hanging below the lowest
> > > frequency dipole. The desired bands are 20 meters, 17 meters, 12
> > > meters,
> > > and 10 meters.
> > >
> > > What separation spacing is required to assure no flashover or
> > > melting
> > > will occur using legal limit power. Is PVC pipe good enough to be
> > > the
> > > spreaders to maintain the dipole separation spacing. Ten foot
> > > lengths of
> > > schedule 40 pipe is $1.44. Are one or two feet separations
> > > sufficient??
> > >
> > > From my reading, the spacing must be greatest at the ends of the
> > > dipoles, because it is the highest voltage point. Is that true with
> > > the
> > > other dipoles being connected at the same time???
> > >
> > > How much interaction should I expect? How would that affect the
> > > 'normal'
> > > length of a dipole?
> > >
> > > Present plans involve hanging the dipole ends from trees with a rope
> > > and
> > > pulley arrangement that will allow lower the antennae for
> > > adjustments
> > > (and repairs if needed).
> > >
> > > Thanks for reading this.
> > >
> > > Thanks for any information you folks may provide.
> > >
> > >            Rolly W7DGX
> > >
> > >
> > > - - -
> > >
> > > Your moderator for this list is:
> > > Larry Wilson KE1HZ [email protected]
> > > _______________________________________________
> > > Antennas mailing list
> > > [email protected]
> > > http://mailman.qth.net/mailman/listinfo/antennas
> > >
> > - - -
> >
> > Your moderator for this list is:
> > Larry Wilson KE1HZ [email protected]
> > _______________________________________________
> > Antennas mailing list
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/antennas
>
> - - -
>
> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
> _______________________________________________
> Antennas mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/antennas
>