|[AMRadio] Pi-Net vs Link Couple|
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
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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