Hi Lf's
in all circuit diagrams I find filters like 12nF---->54uH---->27nF----->54uH----->12nF
here is the 3db point at 250khz.
Has anyone test a filter in this configuration 47nF-----> 54uH----->82nF------54uH----->47nF
here is the 3db point at 147khz.
The 2. filter gives a better suppress of the harmonics!
Wat is the reason that all use the fist one?

best 73' Tom DL4EAU

Lower insertion loss.

 

At 1200 Watts every 0.1dB counts.   and with a push pull design, the second harmonic should be very low.....it's the odd order harmonics you need to worry about.

 

Regards

 

David