It was good to post it. There are many schemes to do demod. The HP 334
distortion analyzer, when used in AM mode, uses a simple diode detector
scheme. I think it can do about 0.25% THD, but need to dig out the
manual to be sure.

wrote:
What I know about building radios or repairing radios or radio related
thingys,y'all could write down on a little bitty postage stamp in great
big letters.I only posted that website in case somebody else might be
interested.Heck,I probally couldn't even put a Ramsey Kit together and
expect it to work. www.ramseykits.com
cuhulin