Topband: Inverted L improvements - Part 3 (now with data)

Todd Goins tgoins at gmail.com
Fri Jan 18 20:22:42 EST 2019


Hello,

I borrowed a RigExpert analyzer and was able to take measurements that
folks were asking for without AM station overload. I also built the K9YC
160m choke (18 turns of RG58 on a type 31 2.4" toroid). That choke is at
the feed point of the vertical. The analyzer was connected directly after
the choke.

I have a collection of data and typed it into Excel but I can summarize
here.

The values are Freq, SWR, R, X, Z

1810  2.1
1820  1.9  29.1  -14.3  32.4
1840  1.8  31.0  -5.7   31.5
1850  1.7  32.0  -1.3   32.1
1860  1.5  33.0  3.6   33.2
1880  1.6  35.3  13.0  37.6
1900  1.8  38.0  22.9  44.4
1920  2.1
1940  2.5
1960  3.0
1990  3.9

 I still only have the 30 x 42' radials attached but can add about 5 x 100'
more radials (in a non uniform layout) if that might help.

Fair, bad, really bad, horrible, hopeless?  Any advice is appreciated.

73,
Todd - NR7RR


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