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echo: ham_tech
to: JAMES AESCHLIMAN
from: JEFF EDMONSON
date: 1997-07-12 08:39:00
subject: Dipole Antenna with Tasse

 > JE>Conventional thinking, maybe   But, traps have historically been 
sed
 > 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>
 > 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.
Don't know what 'V' you're talking about... stretch it out as a normal 
"flat-top" dipole or string it as an inverted vee - either way, at 75m (for 
example 3.900MHz) each leg is 60' (468/3.9 = 120 = 1/2 wavelength - each leg 
of a dipole is 1/4 wavelength, so 120'/2 = 60').
Measure out the quarter wave length at the desired 40m frequency (for example 
7.2MHz - 468/7.2 = 65 = 1/2 wavelength -  65/2 = 32.5 ft)
at the 40m 1/4 wavelength point, hang about a 4" peice of wire from
the existing dipole, on each side of the feed line.
 > 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.
I can relate to that 
 > But, I'll keep it in mind for a field antenna.  It would
 > definately make for less tangled wires.
I will probably be doing some like this, this comming week myself.
Will inform of my results.
   73 = Best Regards
   -Jeff KA5THB
   ka5thb@bigfoot.com
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