[Lowfer] Class E vs. Class C what's your opinion ?

[Andy Bell]

*** See note in paragraph 3  ***  Andy - KU4XR
--- k2ors at comcast.net wrote:

> 
> Ed,
> 
> > One problem with Class E amplifiers is the high
> harmonic content of 
> >the output so adequate filtering is essential if
> you're going to put 
> >something on the air.
> 
>    I have heard it argued  that a low pass filter
> (which is designed around a 50 ohm resistive load) 
> will not perform 
> well into an electrically small, highly loaded
> antenna which will show a highly reactive load at
> harmonics.

               ***   NOTE   ***
_______________________________________________________

I have absolutely NO expertise in this matter; only
quoting something I read in a net article: The second
harmonic of a 1 watt LOWfer xmtr will be around 5dB
down from the fundamental, however the 50 foot antenna
efficiency being around -39dB down would attenuate the
2nd harmonic to around the neighborhood of -34dB,
which if true would be below the -20dB limit.
73, Andy - KU4XR

_______________________________________________________
> 
>    I have also heard it said that a highly efficient
> Class-E amplifier won't have much harmonic energy
> .(However even 1% is a LOT of harmonic energy to be
> radiating!)
> 
>    I don't necessarily believe in either argument
> but how do you refute that?
> 
> --
> 73 Warren K2ORS
> WD2XGJ     136-140kHz
> WD2XSH/23 505-510kHz
> WE2XEB/2   160-189kHz
> WE2XGR/1 505-515kHz
> 



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