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:
https://docs.google.com/presentation/d/1RBxngC3pf0Uop47BVKCdPKaZac4260RU/edi
t?usp=sharing&ouid=101983102297392238928&rtpof=true&sd=true
I haven't seen much activity on this list for a while and thought I might
provoke some comments.
Regards,
Karin Anne Johnson K3UU
Palm Harbor, Florida
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