[AMRadio] Pi-Net vs Link Couple


Donald Chester k4kyv at hotmail.com
Wed Sep 28 21:51:01 EDT 2005


>because of the feed through power from the driver, these cannot be over
>modulated causing "buck-shot" from chopping up the carrier with too much
>audio.

The buckshot from overmodulation is still there because the negative peak is 
squared off as the final amplifier plate current is cut off when the plate 
is driven negative.  You just have some residiual carrier added in.  
"Overmodulation" is defined not necessarily as exceeding 100%, but exceeding 
the MODULATION CAPABILITY of the transmitter.  As soon as the final 
amplifier plate voltage goes past zero, you have exceeded the modulation 
capability of the transmitter, whether there is still rf output or not.





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