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echo: ham_tech
to: IVY IVERSON
from: JEFF EDMONSON
date: 1997-07-10 12:06:00
subject: Multiband antennas

 > Hi, Jeff;
Hey, Ivy!
 >  JE> Here's some antenna discussion fodder:
 >  JE>
 >  JE> A typical dipole cut for the lowest frequency you plan on working
 >  JE> (ie: 80m)
 >  JE>
 >  JE> |-----------------------| |------------------------|
 >  JE>                         | |
 >  JE>                         | |  <--Feedline
 >  JE>                         | |
 >  JE>                      ___|_|___
 >  JE>
 >  JE>
 >  JE> |-----------------------| |------------------------|
 >  JE>        |                | |                 |
 >  JE>                         | |   <--Feedline
 >  JE>                         | |
 >  JE>                      ___|_|___
 >  JE>
 >  JE>
 >  JE> Above, the same 80m dipole with 40m 'tassles' installed.
 >  JE>
 >  JE> A 'tassle' is just a chunk of wire around 4 to 6" in length,
 >  JE> soldered onto the  existing dipole, at the distance from the
 >  JE> feedpoint calculated for 40m, to  allow for resonation at 40m.
 > I haven't heard of using "tassles" for multibanding an antenna.
 > The nearest I have seen is something that is commonly used:
 >     |------------------------| |------------------------|
 >            -----------------/| |\----------------
 >                              | |
 >                              | |
 >                              | | <--Feedline
 >                              | |
 > If you only need 2 elements, you can use standard 300 ohm
 > twinlead for such an antenna.  If you need more, you could use
 > 4-conductor rotor wire for a 4-element version.
See there?  The point is, WHY waste all that extra wire, when you're only 
going to feed one wire at a time, anyway?
With the wave going to the resonant part of the antenna, it will radiate from 
there.
 > Of course, there is nothing stopping you from experimenting with
 > your tassle idea... hey, it might work great!  After all, isn't
 > that what amateur radio is all about?
Bingo!
Actually, this idea DOES work - there are some people who have been using 
this antenna in town for around 10 years, now.  Just thought I'd toss it out 
here, to see what kind of reaction I could get.
 >  JE> Am interested in hearing from anyone why they think this will/will 
ot
 >  JE> work.
 > Personally, I think it may be disrupted by the resonance of the
 > longer arm, but I could easily be wrong.
 > Give it a try and let us know!
Well, right now I'm still working on getting one of my old transmitters 
running again, so I CAN try some antenna experimentation.
but, as I've said above, there's been some testing in this area, at least, of 
the idea - and it seems to be doing good.  I've not talked to anyone who's 
still using the antenna in so long, I don't even know if they're still 
kicking.
The original thinker of this lash-up was Mitch/KB5ZG(sk).  He claimed to have 
success with it, as did a couple of other hams in the San Antonio area.
   73 = Best Regards
   -Jeff KA5THB
   ka5thb@bigfoot.com
--- FMail 1.02
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