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Old October 14th 14, 09:59 AM posted to rec.radio.amateur.antenna
Bernie Bernie is offline
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First recorded activity by RadioBanter: May 2014
Posts: 14
Default Short antenna = reduced power

On Tue, 14 Oct 2014 04:40:19 -0400, rickman wrote:

On 10/14/2014 4:27 AM, gareth wrote:
"gareth" wrote in message
...
Quoting from Electromagnetism By F.N.H.Robinson in the Oxford Physics
Series 1973 edition ISBN 0 19 8518913 Chapter 11, Radiation,
page 102 Formula 11.11

Has in the equation for radiated power the term

(2*PI*L/LAMBDA)**2

where L is the antenna length and LAMBDA the wavelength, thereby
showing that the radiated power decreases when the antenna length
decreases.

I will read up further and report further...


Ramo, Whinnery and Van Duzer gives the same derivation, including the
derivation of radiation resistance.


Are you ever going to share the equations with us?


I wouldn't have thought so, as they're likely to compound his
embarrassment. In a year or so he'll claim to have resolved the matter to
his satisfaction and declare that the posters who disagreed with him were
idiots.