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Old February 27th 05, 04:06 PM
John Doe
 
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Hi Richard,
You may have meant this to go to a different group,
But I must point out the resonant circuits in the output of the exciter.
Usually the exciter has an output lowpass/harmonic filter.
But you knew this anyway

"Richard Fry" wrote in message
...
Many posts under the drifted thread "1/4 vs 1/2 wavelength antenna" give
various views on the physics of generating the maximum safe load power

from
an RF amplifier. To those posters I present this reality.

Modern, solid-state FM broadcast transmitters WITHOUT TUNING OR OTHER
ADJUSTMENT will produce their full rated output power into a 50 ohm load

at
any frequency in the 88-108MHz FM broadcast band, and with ~uniform, and
high PA efficiency (80% or better, typically). These transmitters have no
resonant circuits in their entire RF chain except for their output
lowpass/harmonic filter. It is possible to slew the tx freq from one end

of
the band to the other in the time it takes for the exciter to lock up on

the
new frequency (a second or two).

This reality seems at odds with many of the declarations made in this NG,
and perhaps may inspire some posters to further research their opinions

and
theories.

RF

Visit http://rfry.org for FM transmission system papers.



 
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