Or reduce the loading to present a capacitive reactance at the feedpoint and
shunt it with an inductor. Functions as a step up L-network and presents a
ground at DC. That's what I do here.
Wes N7WS
On 12/5/2020 7:35 AM, Rudy Bakalov via Topband wrote:
P.S. If your vertical has a good set of radials, you will see about 35 Ohm
feedpoint impedance. You may want to wind your own unun using Jerry Sevick’s
cookbook
http://www.introni.it/pdf/Amidon%20-%20Transmission%20Line%20Transformers%20Handbook.pdf
or buy a readymade 35 to 50 Ohm unun from balundesigns.com
The third option is to build a coax transformer per PA0FRI.
Rudy N2WQ
Sent using a tiny keyboard. Please excuse brevity, typos, or inappropriate
autocorrect.
On Dec 5, 2020, at 8:37 AM, David Aslin G3WGN <[email protected]> wrote:
I'm building a contest station and the time has come to make a choice of 160m
TX antenna. Looking at DXE Thunderbolt I note that the capacity hat extends to
a significant distance down the vertical section. It's my understanding that
will shield some of the radiation from the upper part of the vertical.
Alternatives like a vertical tee would not have this issue.
Is my understanding correct?
I'm considering a commercial antenna as high strength telescoping antenna
tubing is unobtanium in UK. My QTH is an exposed windy location so strength
matters!
73, David G3WGN M6O
Sent from my Galaxy
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