The reason to use a series capacitor is to electrically lengthen the
antenna wire, driving the high current point up the vertical section,
for more efficiency. The capacitor electrically shortened the antenna
to the 160 meter band.. With the right amount added wire and capacitor
the feed point would be 50 ohms, without a transformer that could
limit bandwidth somewhat.
73
Bruce-K1FZ
-----------------------------------------From: "N4ZR"
To: "topband reflector"
Cc:
Sent: Sunday September 1 2019 2:46:33PM
Subject: Topband: Hairpin match to inverted L?
The other day a ham friend suggested using a coil ("hairpin") to match
the low impedance of a well-radialed inverted L to 50-ohm coax. This
struck me as a potentially-attractive alternative to a series vacuum
capacitor, but I don't know enough to evaluate it. Thoughts?
--
73, Pete N4ZR
Check out the Reverse Beacon Network
at , now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.
_________________
Searchable Archives: http://www.contesting.com/_topband [2] - Topband
Reflector
Links:
------
[1] http://reversebeacon.net
[2] http://www.contesting.com/_topband
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|