Charles Wittnam wrote:
However, my understanding is that a lot of the
commercial builders of the OCF dipoles use a 2/1 balun for their 40 meter
antennas since they are trying to match a different impedance spot on the
shorter antenna., hence it is not necessarily the case that you can just cut
them down. Any thoughts?

Antennas are scalable so halve the length of the antenna while keeping the
ratio of short leg to long leg the same. Depending on the design, you may
also have to halve the length of the feedline to exactly duplicate 75m
performance on 40m. Hopefully not since 1/2WL on 3.5MHz is about 1WL on 7.0MHz.
--
73, Cecil http://www.qsl.net/w5dxp



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