[Amps] how to wind an HF broadband 10:1 transformer

[David Cutter]

To improve the range of choices, could the non-linearity introduced by the 
core be improved by a feedback system ?  The Amps archives have ideas which 
might bear more fruit with modern devices.

I dare say feedback will need to be handled differently on each band or 
sub-band, but it could save cost, weight, volume and possibly end up with a 
better amplifier in the long run.

Perhaps the goal of 160 to 10 (6=dream?) might have be managed in more than 
one lump.

David
G3UNA

>
> Both iron powder and ferrite cores have to be driven at pretty low
> levels to keep nonlinearity effects in the green range. But then, at RF
> anyway they have to be driven pretty low to keep them from overheating!
> At the flux density levels you can safely put into a core in the upper
> HF range, be it iron powder or ferrite, without exceeding a manageable
> loss, the distortion from nonlinearity will be acceptable in almost all
> cases.
> >
> Manfred.
>