[AMPS] Re: Push-pull 6M amplifier?

[Martin Ellis]

This does not sound like a good idea.
When linear design went to single ended finals with
pi-coupled output, the main reason was improved harmonic
suppression, and coupling to coax feedlines.

I have tried a link coupled amplifier on 6m and the harmonics
were horrendous.

I have found that a pair of coaxial stubs (open and closed)
fitted between the pi-circuit and the antenna relay to be very 
effective in eliminating the 200MHz fourth harmonic.
I could dig up the measurements of it is of any help.
 
B&W sell a 6M low-pass filter with a cut-off at 60 MHz. This 
is only good for 1500W. 

Regards,
Martin ZL1ANJ

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