>
JE> > JE>Here's some antenna discussion fodder:
JE> > JE>
JE> > JE>A typical dipole cut for the lowest frequency you plan on working
JE> > JE>(ie: 80m)
JE> > JE>
JE> > JE>|-----------------------| |------------------------|
JE> > JE>                        | |
JE> > JE>                        | |  <--Feedline
JE> > JE>                        | |
JE> > JE>                     ___|_|___
JE> > JE>
JE> > JE>
JE> > JE>|-----------------------| |------------------------|
JE> > JE>         |              | |                 |
JE> > JE>                        | |   <--Feedline
JE> > JE>                        | |
JE> > JE>                     ___|_|___
JE> > JE>
JE> > JE>
JE> > JE>Above, the same 80m dipole with 40m 'tassles' installed.
JE> > JE>
JE> > JE>A 'tassle' is just a chunk of wire around 4 to 6" in length,
JE> > JE>soldered onto the existing dipole, at the distance from the
JE> > JE>feedpoint calculated for 40m, to allow for resonation at 40m.
JE> > JE>
JE> > JE>The result is a dual-band HF antenna that will not only work
JE> > JE>on 75/80, but 40/15m as well.  (15m being the third harmonic
JE> > JE>of 7MHz)
JE> > JE>
JE> > JE>Don't see why this won't work for a 40/20m situation, either.
JE> > JE>
JE> > JE>Pro's: a substantial savings on the amount of wire used for the
JE> > JE>dipole - only one coax run needed, if setup right no
JE> > JE>tuner/balun needed.
JE> > JE>
JE> > JE>Am interested in hearing from anyone why they think this
JE> > JE>will/will not work.
JE>
JE> > I thought traps were required, not just 4 to 6 inches of wire.
JE>
JE>Conventional thinking, maybe   But, traps have historically been used
JE>-
JE>and, they're a compromise.
JE>
JE> > Interesting idea, but I've never tried it.  The only thing I've
JE> > done is 80 and 40 meter dipoles fed with a single coax.
JE>
(rest deleted)
Very interesting theory.  As I understand it, it's the same as having having
both an 80 and 40 meter dipole on the same coax, except the V is about 30 ft
down each leg of the 80 meter dipole, instead of at the center.
I'm still going to use separate 80 and 40 meter dipoles for my home station,
because I'm also using the antennas to guy the 10 ft mast I'll be using.
But, I'll keep it in mind for a field antenna.  It would definately make for
less tangled wires.  
73
James Aeschliman               KD7MK
Black Diamond, Washington      bb840@scn.org
                                                                              
 
                        
---
 * VbReader V1.41* Ok, now for a quick backu+A+&2#^1s=
--- WILDMAIL!/WC v4.12 
---------------