[AMRadio] RE: Modulator design needed

John E. Coleman (ARS WA5BXO) wa5bxo2005 at pctechref.com
Mon Mar 27 19:57:31 EST 2006

Your Right Gary on the out put of AB1 VS AB2

Since the plate current swing is limited to not drawing grid current one
generally ops for better linearity and gain by using a high plate "Z" load
in AB1 than in AB2.  This also reduces output slightly. It can be
accomplished on a modulator by simply unloading the final to draw less
current, thereby reflecting a high Z to the modulator.  It makes the audio
really smooth but a lot less PEP.


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