Hi everyone...
Have replaced my 80M station with another....
The circuit is much the same as on Steves WEB site....
VFO / PWM kit and TX using 4 Fets ( but without the overload circuit SORRY )....
It all works fine ... except there is what would be best described as a crackle that seems to be related to the audio peaks......or Modulation level.....
I am not using the D limit c limit components.....
I use a carrier voltage of 30Volts and 126Volts under load Head Room.....the carrier alone is quiet....
Up to appox 50% Modulation level all seems OK ... but over that particularly 100% the pops / crackle are too noticeable....
I have built 4 PWM and never had this problem at all.....they all worked from word go really ...
I wonder if anyone has had this problem before ?
Wayne
VK3ALK