[Antennas] Dipole

Thu, 9 Jan 2003 16:35:37 -0800 (PST)

This a great job for antenna modeling. You can model
this puppy and sweep and prune and stuff without
looking dumb in the backyard.

The height of the antenna will be crucial to this
model as will all dimensions, spacing, etc.

I'm sure someone has said this before, but really you
should feed a 40m dipole w/ balanced line and use an
in-shack transmatch w/ balun to tune all bands.

However, you can certainly feed this with coax but
expect a LOT of tuning interaction if you can't fan
the elements out.

73, Steve N4SL

--- Mike Rhodes <[email protected]> wrote:
> Mike,
>   Not quite sure what you said but if I interpret it
> correctly, you stated
> the problem with your theory in the last line. The
> longest antenna will
> undoubtedly change length at some point in time if
> you are starting the
> tuning process with the shortest antenna. Therefore,
> all shorter antennas
> are more likely to change as you tune the longer
> elements (i.e., the longer
> elements affect the shorter elements much more than
> the shorter elements
> effect the longer).
> 
> Mike / W8DN
> 
> ----- Original Message -----
> From: "Mike Olbrisch" <[email protected]>
> To: "'Wes (N7WS) and Linda'"
> <[email protected]>; "'WD8OKN de
> Michigan'" <[email protected]>; <[email protected]>
> Cc: <[email protected]>
> Sent: Thursday, January 09, 2003 7:11 PM
> Subject: RE: [Antennas] Dipole
> 
> 
> > Hmmmm...  I disagree, but I could very well be
> wrong.  I would tune the
> > shortest element first.  Once it is done, it will
> have little further
> > CHANGING effect on the longer one.  OTOH, since
> the longer one will
> continue
> > to be longer, it's effect on the shorter ones will
> remain constant no
> matter
> > what the change (unless it becomes at long or
> shorter).
> >
> > Someone correct me if I am backwards.
> >
> > Mike.  KD9KC
> > El Paso, TX.
> >
> > > -----Original Message-----
> > > From: [email protected]
> > > [mailto:[email protected]]On Behalf
> Of Wes
> > > (N7WS) and Linda
> > > Sent: Thursday, January 09, 2003 11:42 AM
> > > To: WD8OKN de Michigan; [email protected]
> > > Cc: [email protected]
> > > Subject: Re: [Antennas] Dipole
> > >
> > >
> > >
> > > 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.
> >
> >
> > - - -
> >
> > 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

__________________________________________________
Do you Yahoo!?
Yahoo! Mail Plus - Powerful. Affordable. Sign up now.
http://mailplus.yahoo.com