HI All,
Today we finished installing a vertical with a top hat at HG0R, but it
is not perfect (yet).
The vertical part is about 20.5m (67 ft) tall, starts with 10m of 50mm
(2") pipe at the bottom, and ends with 28mm (1.1") OD pipe on top.
There are 8 quarter-wave radials below the antenna a
Steve,
*I believe there is a measurement error. *
1. The reactive part of the input impedance should not become more
inductive as the frequency is decreased. 1904kHz --> Z=68.1 + j0.3 and
1844kHz -->48.9 + j21.5.
2. An EZNEC model over 0.005/13 GND shows resonance at 1750kHz and the real
part of
I agree with Dave's comments based on measurements and modeling of two
different similarly sized top loaded verticals.
Grant KZ1W
On 11/7/2020 07:49, Dave Cuthbert wrote:
Steve,
*I believe there is a measurement error. *
1. The reactive part of the input impedance should not become more
indu
You can also alter the resonance by changing the slope of the top hat
wires. If you can make them more horizontal, this will slightly lower
the resonant frequency. Either make them tighter or move the ends of the
supports further out. I have supports 3 m high, 40 m out from the
centre. My top l
