Re: [softrock40] non linear SSB PA, [WOT]
- Art wrote:
> Greetings all,
> I've recently become interested in using non linear amplifiers to
> amplify SSB. Obviously, this is a problem, we all know an amplifier
> for SSB has to be linear, or class AB1.
> Even if we bias an AB1 amp properly, some (all) power amps have non
> linear responses. Even if we put the cleanest audio on the planet
> into them, they don't work well. We refer to this problem with many
> different technical terms. But, the problem is non-linearity in the
> PA itself. Whenever the output of a PA is distorted, it uses more
> spectrum than it should and causes interference well outside it's
> expected bandwidth.
> The short version is that the amplifiers output doesn't follow the input.
Yes it possible but its asking for trouble in Ham land, I've worked on
reduce distortion, by prediction the effect a non-linear PA has,
intermod, transients etc,
and correcting phase and amplitude before it fed to the PA.
Its not a technology I feel would be easy to use on Ham applications,
Using it for edge and similar
modes maybe, but SSB is push the limits hard. you can predict and alter
a signal when you know the exact pattern
,speech is much harder