[R-390] Synchronous AM Reception

Mon, 25 Mar 2002 13:15:59 -0800 (PST)

Jim,

thanks for the comments.

I looked into building the handbook version, but was looking at about five
different sources to round up the old chips needed.

I'd like to build the one you are working one, so when you get it finished
please publish it somewhere!!

Thanks
Tom
--- Jim Amos <[email protected]> wrote:
> There was also a circuit in the 1999? handbook that was both a synchrous
> detector and external BFO / product detector.  It did use a 455KHz IF input
> as well.
> 
> This circuit was nice in that it also provided for synchrodyne demodulation.
> This is a version of synchronous detection that amplifies and limits the
> carrier before applying to the product detector.  It does not, however,
> phase lock a carrier generator to the incoming signal as true sync detection
> does.  Interesting for comparison, however.
> 
> The drawback to this circuit is that some of the IC's were not as readily
> available as one would like.  I'm working on a version that should be
> completed some time before the 75'th B'day of my R-390A that uses NTE
> available IC's.  But this project is still in the planning stages and is a
> result of the following failure:
> 
> I was recently experimenting with a circuit originally published in Comm.
> Quarterly based on a Motorola Stereo Demodulation chip.  It however, it not
> go well. The version of chips that I received would not lock over a wide
> enough range to make the circuit useful as an add on Sync Detector.
> 
> I also have a friend that was selling synchronous detector kits.  His kits
> were based off of the IC used in the Sony receivers.  They worked quite
> well, and provided for sideband selection of the AM signal.  They were
> purely for AM demod however, and did not provide a SSB / CW product
> detector.
> 
> Jim N8CAH
> 
> 
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
> Behalf Of Jim Brannigan
> Sent: Saturday, March 23, 2002 3:39 PM
> To: R-390 list
> Subject: Re: [R-390] Synchronous AM Reception
> 
> 
> Thank you for all the replies.
> I also did some digging on the WEB.
> Very interesting.......
> 
> 73, Jim
> 
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