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Quasi synchronous detection is a non-PLL type of sync detection.......like
the type that was used in the Drake R7 receiver. Basically, it consists of using a mixer to demodulate the AM signal in this way: the I.F. signal is split into two paths. The unprocessed I.F. signal (one of the paths) is applied to the RF port of a mixer, while the other path is squared up through a limiting amplifier and applied to the LO port of this same mixer. The demodulated audio is taken from the I.F. port (output port in this case) of the mixer. I did a similar design a couple of years ago, using a Philips SA637 Digital FM Receiver chip. Philips discontinued that device so I went with the AD607 for my subsequent design. I hope this helps. Pete "John S." wrote in message ups.com... Which radio...haven't heard that term. |
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