Chuck S. wrote:
With respects to antenna matching, i.e.: 50 to 450 Ohms, which is better
to use, an autotransformer or a transformer with an isolated primary and
secondary? I’m looking for the pro’s and con’s of each.

Where are you going to find a 450 ohm antenna?
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73, Cecil http://www.qsl.net/w5dxp