> Well, I think it is possible. It has been done, there are
> pleanty of good designs that are available. I sugest that
> you might read the ALS-500 manual, it says in the first
> paragraph that it covers the full frequency range from 1.5
> to 21.6 Mhz, and looking at the front cover, that does
> seem to be the case. It's not too hard to get 500 watts
> out of an FET these days. Tokyo hipower is producing a
> legal limit solid state amp, and I know for a fact that
> the design they use can operate on 5 Mhz. As a second
> fyi, I have an old 3-500z amp from Amp Supply, and just
> playing around, I could tune it on 5 Mhz pertty easily by
> selecting the 80 meter band select, and I could get about
> 900 watts into the dummy load.
I would never use a ALS500M at home. It really is intended
for applications where you only have 12 volts and aren't
using a good station.
I would get the ALS600 FET amplifier. It is much cleaner.
By the way, contrary to misapplying books and rumors, ALL
type-accepted amplifiers have to pass FCC requirements for
harmonics. Any Ameritron amp will always be at least several
dB better than minimum requirements (around -45dBc) for
harmonics. The problem is odd-order IM products that create
splatter. Not all amps are equal, and it is NOT the
filtering that matters.
The tuned input of a GG amp, by virtue of the driving
impedance at harmonics, can greatly affect harmonic levels.
This is because the cathode circuit can affect waveshape of
the anode current on a fractional cycle basis.
73 Tom
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