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Old November 30th 07, 01:48 AM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Mar 2007
Posts: 3,521
Default Loading Coils; was : Vincent antenna

Richard Fry wrote:
Do you believe that a 75m mobile antenna system using an artificially
resonant (as in bugcatcher-loaded), electrically short whip produces the
same elevation pattern and groundwave field strength at 1 km as an unloaded
1/4-wave vertical monopole for 75m with the same applied power using a good,
buried radial r-f ground (say, 2 ohms or less)?


No, the radiation pattern depends upon the *physical*
length. The feedpoint impedance depends upon the
*electrical* length. (I haven't said anything about
the radiation pattern in my postings.) Unless the
antenna is "full-sized", the physical length and
electrical length are different.

There is a free lossless phase shift between the top
of a loading coil and the stinger. There's obviously
zero radiation from that dimensionless point. That 40
electrical degrees of antenna is not physically there
so it cannot radiate.
--
73, Cecil http://www.w5dxp.com
 
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