[AMRadio] Antenna experiments...


Brett gazdzinski brett.gazdzinski at verizonbusiness.com
Sun Mar 4 19:55:04 EST 2007


I did some more listening today, on both 80 and 40 meters,
and the dx-dd always receives much more noise than the 
vertical or the g5rv.
I suspect because its over the house and parallel to the 
electric wires running down the street.

It sometimes receives signals stronger then the other 2 antennas
but its always got much more noise.

The butternut vertical is often VERY quiet, mostly 10 db down
on receive, but often the noise level is zero while the others
have s9 noise levels.

My next experiment might be a bent 80 meter dipole
(with the wires through the trees) with a 40 meter dipole
below it hooked up to the same feedpoint.


Brett
N2DTS
 



> 
> Hi Brett,
> 
> Generally, you can bend an antenna all over the place as long as you =
> keep the center straight and in the air.  Don't bend the ends 
> more than =
> 90 degrees or you will introduce cancellation with the other 
> part of the =
> antenna.  Bends introduce all sorts of funny patterns, but 
> overall the =
> antenna will work better than shorter antennas with coils.  
> If you can, =
> keep the antenna somewhat symmetrical (bends on both ends). =20
> 
> Another way to take three or so feet off each end (that is, 
> shorten the =
> antenna) is to attach a copper toilet bowl float at each end of the =
> antenna.  The floats act as giant capacitors.
> 
> Sometimes a delta-loop will fit where a dipole won't.  They 
> are great =
> antennas.  For 80 meters, the sides of the triangle need to 
> be about 90' =
> each.
> 
> Good stringing!
> 
> 73 de Bill, AB6MT
> hbco2 at sbcglobal.net
> 




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