I found addition information about the log detector in the AN7222 AM/FM radio ic. The dynamic range just is not big enough for myb application. It can detect levels between 60 and 100 dbuV. That is just 40 db dynamic range. I had those AN7222 ic's in the junkbox so I used them. If I had no such ic's then I would have bought NE604 chips .This is a FM IF ic. I have used the NE604 in serveral projects. They work great.
So today I'll try to buy some. I hope they are still in stock.
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