If you top load a 43 ft vertical to make it resonant on 80 meters,
it will be a voltage fed vertical on 40 meters. That means the
impedance will be around 1000 ohms. Now you can put that
vacuum variable to good use.
Rick N6RK
On 8/14/2017 7:54 AM, Art Greenberg wrote:
Grant,
A very interesting setup on that vertical!
I'm extending an existing 43-foot vertical to get a marginally better
and easier to feed antenna for 80/75 while still being suitable for 40m,
which at present is my favorite band. I don't know what top loading the
53-foot vertical would do to 40m performance and I worry about feeding
it on 40m. I'll model that to see. Its an intriguing possibility.
Its true that the smaller values of the CDV16 line are somewhat current
challenged. But it looks like I could put some higher valued parts in
series to overcome that.
I appreciate your input.
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