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Old April 28th 06, 02:36 PM posted to rec.radio.amateur.antenna
Cecil Moore
 
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Default Missing Degrees in Mobile Antennas?

Yuri Blanarovich wrote:
We used 90 deg. monopole in discussion to show typical loaded or mobile
antenna in order to avoid detours to la-la land (cases when current can be
and is equal) and to stay on the subject of current magnitude along the
typical loading coil.


Take a look at the rest of the posting, Yuri. I show where a
1/4WL stub can be made up of 30 degrees of 450 ohm line plus
11 degrees of 50 ohm line. The impedance discontinuity (at
a point) furnishes the "missing" 49 degrees of stub.

At 4 MHz, that would make a 1/4WL stub only 23.4 ft long
or about 10% of a wavelength instead of 25%.

Has anything been published on using multiple Z0's to
shorten the physical length of a stub?
--
73, Cecil http://www.qsl.net/w5dxp


 
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