The recent availability of low cost True RMS demodulators for AM signals has prompted
the quest for more knowledge about the performances of RMS AM demodulators
compared to ENVELOPE AM demodulators.
Both are non-linear circuits, therefore the answer may come from SPICE simulations.....
Full story here:http://www.ing.unitn.it/~fontana/AmDetCompare.pdf
An example of RMS AM demodulator for the Drake R4B here:http://amfone.net/Amforum/index.php?topic=29362.0
It really needs it.