Kevin & Natalia wrote:
Hi All,

I have just built a 20m dipole as a temp antenna for home.
I will be driving it with a TS-830 transceiver, which uses valves in the
final stage.
I know that I can only use it close to the cut frequency, but want to build
a small tuner to allow me to go off the cut slightly.
I only want the tuner to be used on 20m, so I do not need any coil tapings
for switching bands, so maybe a couple of caps will do the job.

Look forward to any replies. Regards Kevin, ZL1KFM.

Hi Kevin, feed it with 450 ohm ladder-line. Make the ladder-line
length an integer number of 1/2 wavelengths. Then you can tune
your antenna system to resonance without a tuner by adding one
foot of ladder-line for lower frequency operation and subtracting
one foot for higher frequency operation. Varying the length of
the ladder-line by 0, 1, or 2 feet should cover the entire 20m
band. My resonant frequencies are 0' = 14.34 MHz; 1' = 14.2 MHz;
2' = 14.1 MHz. Of course, it doesn't have to be in one foot
increments. 35 cm increments might be better. :-)
--
73, Cecil http://www.qsl.net/w5dxp


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