These are actual measured values for the resonant lengths
of the series section transformer for all HF bands for
my optimized G5RV.

102' dipole, insulated wire. Ladder-line is approximately
Z0=380 ohms, VF = 0.9. Coax is RG-213

The insulation on the wire makes it electrically about 3%
longer, i.e. approximately the same as a 105' uninsulated
dipole. The ladder-line is Wireman #554, #14ga, "440 ohms",
but measures closer to 380 ohms.

Freq-MHz ladder-line length
3.8 23 ft.
7.2 35 ft.
10.125 20 ft.
14.2 29 ft.
18.14 36 ft.
21.3 27 ft.
24.95 29 ft.
28.4 38 ft.

Since my favorite bands are 40m and 17m, I keep the length
of the ladder-line at 36 feet most of the time. I rarely
work 30m so my minimum length is 23 feet. I have lengths
of ladder-line with banana plugs on one end and banana
sockets on the other end. I have one 8 ft. length, one
4 ft. length, one 2 ft. length, and one 1 ft. length so
I can achieve any length between 23 feet and 38 feet to
the nearest one foot. Of course, switches or relays could
be used instead of banana plugs.
--
73, Cecil, http://www.qsl.net/w5dxp



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