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Synchronous Detection Info

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Steve - WB3HUZ:

Here's a reading list I put together over the years on the subject.

1. Costas, J.P., "Synchronous Communications," Proceedings of the IRE, Dec 1956, pp. 1713-1718.

2. Correspondence, "The Synchrodyne," Electronic Engineering, July 1947, pages 238 and xvi.

3. Crosby, Murray G., "Exalted-Carrier Amplitude- and Phase-Modulation Reception," Proceedings of the IRE, Sep 1945, pp. 581-591.

4. Herbert, J.W., "A Homodyne Receiver," Wireless World, Sep 1973, pp. 416-419.

5. Hershberger, Dave, "Build A Synchronous Detector for AM Radio," Popular Electronics, April 1982, pp. 61-71.

6. Hood, J.L. Linsley, "Synchrodyne A.M. Receiver," Wireless World, Jan 1986, pp. 51-53, Feb 1986, pp. 53-56, Mar 1986, pp. 58-61.

7. Johnson, Steve, "Synchronous Detection of AM Signals: What is it and how does it work?", QEX, Sep 1992.

8. Jones, Howard E., "Dual Output Synchronous Detector Utilizing Transistorized Differential Amplifiers," US Patent #3,241,078, Mar 15, 1966. 

9. Macario, R.C.V., "How Important Is Detection?," Wireless World, Apr 1963, pp. 52-57.

10. Nagle, William, “The Synchronous Detection Process,” 73 Magazine, Sep 1967, pp. 6-11.

11. Nauta, H.C. and E.H. Nordholt, "A Novel High-Dynamic-Range PLL System for Synchronous Detection in AM Receivers," IEEE Transactions on Consumer Electronics, Vol. CE-31, No. 3, Aug 1985, pp. 447-455.

12. Novinger, Walter, "Johnson's Synchronous Detector Kit," Electric Radio, Oct 1994 (Issue 66), pp. 18,36-7.

13. Pik, J.P., "High Fidelity (Snychrodyne) AM Broadcast Tuner," Proceedings of the IREE Australia, Sep 1975, pp. 300-309.

14. Prather, Scott, "A Unique Approach to AM Synchronous Detection,"  Communications Quarterly, Fall 1994. FAR Circuits has a $5.25 board, www.cl.ais.net/farcir/. Article available at http://swordmaking.webjump.com/radio/

15. Priebe, H.F, Jr., “Auto-Product Detection of Double-Sideband,” Ham Radio, Mar 1980, pp. 58-61.
16, Staples, John, "Synchronous Detectors," Electric Radio, Oct 1991, pp. 10-13.

17. Staples, John, "A Practical Synchronous Detector," Electric Radio, February 1992 (Issue 34), pp. 12-15.

18. Tucker, D.G., "The Design of a Synchrodyne Receiver, Part I - Design Principles," Electronic Engineering, August 1947, pp. 241-245.

19. Tucker, D.G., "The Design of a Synchrodyne Receiver, Part II - Some Suitable Designs," Electronic Engineering, Sep 1947 pp. 276-77.

20. Tucker, D.G., "The History of the Homodyne and Synchrodyne," Journal of the British Institution of Radio Engineers, Apr 1954, pp. 143-154.

21. Tucker, D.G., "The Synchrodyne, A New Type of Radio Receiver for AM Signals," Electronic Engineering, March 1947, pages 75-76.

22. Tucker, D.G. and J. Garlick, "The Synchrodyne: Refinements and Extensions," Electronic Engineering, Feb 1948, pages 49-54.

23. Tucker, D.G. and R.A. Seymour, "The Synchrodyne As a Precision Demodulator," The Wireless Engineer, Aug/Sep 1950, pp. 227-237.

24. Vermasvuori, Jukka, "A Synchronous Detector for AM Transmissions," QST, July 1993, pp. 28-33.

25. Webb, John K., “A Synchronous Detection Adapter for Communications Receivers,” CQ, June 1957, pp. 30-33, 117.

26. Young, Paul H., “Electronic Communication Techniques, Fourth Edition.”


Steve - WB3HUZ:

Attached is a presentation I gave on the subject at the AM Forum, Dayton Hamvention, 2001.

Steve - WB3HUZ:

Here is the Costas Patent.

K1JJ:

Steve,

Guess they could get away with a name like, "Homodyne" in the 30's.  That 16 tube sync detector sure sounds like a worthwhile project too. (gag gag - maybe just before I cut my throat)


BTW, nice job on the Dayton 2001 slide presentation.

T

Steve - WB3HUZ:

TNX OM.

The article by Bill - W3DUQ from the September 1967 issue of 73 magazine is available at the link below.

http://www.amwindow.org/tech/pdf/w3duqsyncdet73mag1967a.pdf


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Synchronous Detection Info

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k4kyv:

Thanks for posting the information and the scans.

W3FJJ:

Hi, I posted some pics and schematic of a synch detector, I designed and
built back in the 90's.

http://128.4.132.29/w3fjj/synch/synch.htm




K3ZS:

I built one for a Doppler sonar system in the late 70's.    It was based on a Signetics NE561.    This was a phased locked loop IC with a second mixer.    It was discontinued, but it was almost a single chip synchronous detector.


K3ZS:

Looking back it was based on two of them.    A second one locked in quadrature to the first one.    Used the mixers in each one to get the I and Q channel.


Rob K2CU:

I still have at least 8 NE561B in my lab. Made up a B'cast band single chip receiver. The output of the PLL section, which was basically a NE565 function, was directly connected to the second Gilbert cell. The trick was to fed the RF directly yo that cell and then put a simple R phase shifter with about 90 degrees of shift to the input of the PLL. That made the normally quadratue PLL VCO be in phase with the incoming RF. OF course, there was phase error across the b'cast band, but it was hardly noticed with all the soup coming in on L.I., NY. And the PLL gave you detected FM as well. Would be good for use in an IF system. Neat little IC.

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Synchronous Detection Info

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K3ZS:

When you use two of them, the first one gives you the Q output, locking the second one to the first gives you the I output on its mixer.    Did not need any phase shifting networks.     These outputs were scaled to 0V with opamps.    It went to a DSP that did FFT's for the spectrum display.    Looking around the internet, it seems that nothing like the 561 can be found.   I think I'll look around some more and get back into development as a hobby.   



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