SV: [AMPS]Plate choke at the antenna end instead?

[Peter Chadwick]

Craig says:

	>it offers 60 db attenuation of the second harmonic.  It  offers
much >greater performance than the 7 element chebyshev design

You get about 30dB of second harmonic attenuation in a pi with Q =12,
another 30dB is all you need at the most. This means a fairly simple filter
will do....such as a n=3 Chebyshev with .01dB ripple.....that's 2 caps and
one inductor, or 2 inductors and one capacitor. Which one depends on the
availability of the caps - they'll have to handle a lot of current, and for
1500 watts, really need rating at 500v AC at the frequency of operation.
(More if you use two inductors and one capacitor) 

73

Peter G3RZP



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