Hello group !
I found that almost all
amp configurations generate harmonics. In case of a homebrewed HF amp, with a push
–pull design, I had to build hi-pass filters with a resistive termination,
so called split filters, for each band. Without dissipating the harmonic energy
the stage will have to cope with excess voltages and thus bury the MosFets .
My last amp stage for the
DI2BJ-beacon is followed by a hi-pass that opens at 750 kcs . This way the
first harmonic and all the higher ones go into thermal dissipation.
A T-type adjustable low-pass
is used to match and reduce harmonics further.
Have fun de
wolf df2py
