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[IRCA] "Detuning skirts"
- Subject: [IRCA] "Detuning skirts"
- From: Charles A Taylor <MWDXer@xxxxxxx>
- Date: Mon, 25 Jun 2007 17:44:46 -0400
Bill
Thank you for throwing me easy questions. Please, no existential questions
like. "Why does a dog?"
"How many 6L6s are there in the Universe?" or "how many angels can dance on
a surface-mount, 1-k
ohm resistor."
A detuning skirt is placed on a tower to make it non-resonant at the
operating frequency of a station.
If the resonant frequency of a tower is near or at the operating frequency
of a station operating
nearby or co-located, it will extract a significant portion of the radiated
signal and re-radiate
it in a manner to directionalize or malform a directional pattern of that
station.
Sometimes stations will erect towers that are nearly resonant at the
station frequency, and that are
not tied into the station RF system. Such towers are called "parasitic
elements" If too short to be
exactly resonant, they can act to direct a signal's radiated signal in
their direction; if too long,
away from their direction. These are call "directors" and "reflectors,"
respectively.
A detuning circuit (not necessarily a "skirt") may sometimes be placed on
water towers, TV towers, or
power transmission line towers that are located near a broadcast station's
tower so as to prevent such
towers from malforming directional patterns, or directionalizing
non-directional stations.
I'm sending this out on ABDX and IRCA because it may be of interest some
others.
Seb'nty Threes,
Charles
Charles A Taylor, WD4INP
Greenville, North Carolina
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