[Antennas] Dipole

Fri, 10 Jan 2003 21:15:33 -0700

300 ohm twinlead is available from your local Radio Shack in 100 ft.
rolls. Even better, I like to use 300 ohm ladderline for the whole thing.
Ladderline is available from "The Wireman"  or "Antennas West" online. I
prefer to feed it with ladderline all the way to my tuner, with the Balun
inside the shack.
73's de Jerry, K�EJF

On Fri, 10 Jan 2003 16:55:28 -0800 Chris BONDE <[email protected]> writes:
> In my ARRL Antenna HdBk (very old1988 and starting to fall apart, 
> like me) 
> there is a multiple-dipole antenna described .  It is a construction 
> by 
> Louis Richard, ON4UF.  It has 4 dipole (for 7,14,21,28mHz) 
> constructed from 
> 300 ohm ribbon (Remember that stuff used for TV?, Hard to find 
> now-a-days)  THe feeder is 52 or 75 ohm coax.
> 
> The measurements aro  7.1  32ft 8in, 14.1 15ft 1in, 21.2  11ft 3in 
> and 
> 28.2  7ft 8in.
> 
> I know of a number of hams locally using  4 wires in a parrallel 
> type 
> dipole.  Best to have a good tuner.
> 
> Chris opr VE7HCB
> 
> 
> At 11:41 AM 2003-01-09 +0000, Wes (N7WS) and Linda wrote:
> >At 12:20 PM 1/9/2003 -0500, WD8OKN de Michigan wrote:
> > >I am building a multi-band dipole.  It will be cut for 40m, 20m, 
> and 10m.
> > > I've been told to be careful and I've read that you should NOT 
> run the
> > >legs of the dipole parallel with each other.    I've read they 
> need to be
> > >perpendicular.  However, I've seen many dipoles built this way
> > >(parallel).
> > >
> > >What are the groups thoughts?
> >
> >I don't know about the group, but my thoughts are thus:
> >
> >You can run the wires parallel to each other but you should expect 
> more
> >interaction between them.  In other words, they will be harder to 
> prune to
> >resonance.  Start with the longest element and work up.
> >
> >The greater the angular separation between them, the lower the 
> interaction.
> >  At 90 degrees there is in theory no interaction.  But you have 
> three
> >wires, so it's a bit difficult to keep them all at 90 degrees to 
> each other :)
> >
> >
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> >
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> 
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> 

E. J. (Jerry) Forwood
K�EJF