|[AMRadio] Windom Antenna|
Mike Dorworth, K4XM
k4xm at arczip.com
Mon Dec 27 11:52:08 EST 2004
In QST magazine for September 1929 the original Windom Antenna article
starts on page 19. It clearly shows that it is exactly resonant on all of
it's design bands, so long as there is an harmonic relationship. 80-40-20-10
etc. There are diagrams included which show how this is determined with an
RF ammeter and a rolling trolley after which very precise and repeatable
formulas were derived. Of course this is the single wire fed version. The
later 300 Ohm job is merely wishful thinking.The length in feet is always
468, divided by desired frequency in Kc. For the lowest desired band. The
tap is always feet times 25 divided by 180. I might add that antennas put up
as temporary during this nasty winter weather last 20 to 30 times longer
than summer installed permanent antennas. happy antenna experimenting. 73,
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