Thanks Dana. I am looking for something that can be built with discrete electronics, else the AD chip is simple and great. A simple RF peak detector instead of average (that most detectors are) implemented in just a few transistors if possible. Accuracy or linearity is not that much of concern, this is for a hobbyists circuit.
There is a circuit I have found but I am not sure it will do.
www.simplecircuitdiagram.com
plus I do not like the -/+ voltage
it seems that it might be able to hold the peak for some time?