e3a4d6c7   
   From: spam@spam.com   
      
   On Sun, 17 Jul 2011 05:15:19 -0700 (PDT), Patrick Turner   
    wrote:   
      
   >On Jul 17, 9:27 pm, s...@spam.com (Don Pearce) wrote:   
   >> On Sun, 17 Jul 2011 04:14:48 -0700 (PDT), Patrick Turner   
   >>   
   >>  wrote:   
   >> >I tried full wave, but not so easy at all. I've tried a 2 diode   
   >> >voltage doubler, also not worth the slight increase in Vo.   
   >>   
   >> >There is utterly no need for any more than what I have, IMHO.   
   >>   
   >> Have you tried a synchronous detector? Generate a well-limited square   
   >> wave at the IF frequency and use it to switch a full wave diode   
   >> bridge. This will recover - with perfect linearity - any AM signal,   
   >> even one modulated well beyond 100% (provided it has been carried out   
   >> properly).   
   >>   
   >> d   
   >   
   >I'd have to build a 455kHz square wave oscillator, and its all a lot   
   >of tubes and work and I already get excellent AM reception I'm happy   
   >with. What you say is easier said than done. If you don't agree,   
   >please post fully worked out schematics somewhere at your website to   
   >prove I am uneducated. Ball's in your court now.   
   >   
   I designed a synchronous AM detector back in the days when I was at TV   
   designer for the Rank Organization. I have no intention of doing it   
   again because AM radio is by now a busted flush. And of course you   
   don't use an oscillator, you just apply severe limiting to the IF   
   signal to strip off the modulation and leave a square wave.   
      
   d   
      
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