I was very fortunate to have a 308 insulated Blau-Knox self supported
tower in my back yard with 120 radials all 250' long, in the later 70's
and early 80's and when the radio station was off the air at midnight
able to match this monstor well with a tuned circuits at the base.
Results were very discouraging as I expected it to rock and roll on top
band and it didn't. Instead I hung a 1/2 wave center fed 45 degree
sloper from a rope to the top with the tower as an untuned periodic
reflector and zounds! Being able to work 10 watt G-stations (I think
this was their power limit at that time) and many other Eu stations made
me convinced that a 5/8 wave vertical, even over an excellent ground
wasted energy at none optimal radiation angels. Their appeared on the
books a very high angle lobe which is not useful for DX plus significant
radiation below 10 degrees. I am not sure where the too low angle is on
160 but something was definitely wrong. The sloper changed all that. I
also believe, and I hope I am right, that an excellent efficient
vertical height for top band is a 3/8 wave vertical. It is also very
easy to feed with just a series capacitor to tune out the inductive
reactance.
Herb Schoenbohm, KV4FZ
On 9/26/2013 10:52 AM, Mike Waters wrote:
A lot of hams on 160m have been similarly "shocked". :-)
73, Mike
www.w0btu.com
On Thu, Sep 26, 2013 at 9:37 AM, Niko Cimbur <ac6dd@yahoo.com> wrote:
We were shocked to find that the existing 1/4 wl performed better than the
much taller [5/8 wave] Vertical.
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Topband Reflector
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Topband Reflector
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