You might eventually consider buying an automatic "L" network tuner.
You might find that wire will play on a number of bands above 20.
On Tue, Jun 14, 2022, at 12:00 PM, Karin Johnson wrote:
> Hello Group:
> I recently have put up a wire antenna for 20 Meters. It is a three-eights
> wavelength wire vertical cut for the low end of the 20 Meter band. I have an
> appropriate matching network at the base of the vertical. It works like
> text book.
> So I've been thinking. I am a bit compromised with real estate and space
> for a few more antennas. You can never have enough antennas. So I was
> thinking, I am wondering if the 3/8 wavelength wire is resonant on any other
> band. Lo and behold, it is the perfect length for a 3/4 wavelength vertical
> wire for the low end of the 10 meter band. Sooooooooo ! ! !
> I designed a new outside matching network to handle both bands.
> The new matching network incorporates two vacuum relays, a vacuum variable
> capacitor for the 20 meter portion, and a 1 to 4 balun for the 20 meter
> band. Plus at the shack end of the coax a Bias Tee inserter for control
> power of the relays.
> I am including link to Google Drive if anyone is interesting in seeing the
> design concept. It is below:
> I haven't seen much activity on this list for a while and thought I might
> provoke some comments.
> Karin Anne Johnson K3UU
> Palm Harbor, Florida
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