[Hammarlund] Product Detectors.

[Richard Knoppow]

    You might check with Treetop Circuits
http://www.treetopcircuits.com/pmwiki/pmwiki.php/Main/HomePage
    He makes very good adapters for several receivers including 
the SP-600. It may be that one of his existing products will work 
in your receiver or that one can be easily modified.  I have his 
adapter for the 51J series.

On 6/5/2019 5:17 PM, Kenneth G. Gordon wrote:
> I have been asked to provide information on various articles on 1) the
> modification of our receivers for a product detector, and 2) a
> stand-alone external product detector unit.
> 
> Electric Radio Magazine, www.ermag.com, has published at least 10
> articles which deal, in one way or another, with this issue.
> 
> Here is a list of articles on modifications, the receiver involved, and
> the issue number and date:
> 
> 1) A Product Detector for the NC-183D, ER issue number 44, Dec.
> 1992
> 2) A Product Detector for the R-390A, ER issue number 58, Feb. 1994
> 3) AGC and Product Detector Changes for the Collins 75S-3B/C
> Recievers, ER issue number 244, Sept. 2009
> 
> The next list contains article on the construction of a Product
> Detector.
> 
> 1) Improved Audio from a Product Detector, ER issue number 65,
> Sept. 1994
> 2) A Product Detector for the HRO-60, ER issue number 90, Oct.
> 1996
> 3) A Product Detector for the HRO-60, ER issue number 228, May,
> 1008 (This is NOT the same article as #2 above.)
> 4) Oh,No, Not Another Product Detector Article, ER issue number 99,
> Jul. 1997
> 
> And last, but not least, an article on a stand-alone Product Detector
> unit.
> 
> 1) A Product Detector for a Homebrew Receiver, ER issue number
> 357, Feb. 2019.
> 
> The remaining 2 articles in my list are "reviews" of commercial
> Product Detectors for various receivers.
> 
> All these articles are copyrighted. You may buy copies of the various
> Electric Radio Magazines from Ray Osterwald who publishes the
> magazine.
> 
> You can contact him at www.ermag.com
> 
> In addition, there were several companies who built and sold external
> add-on product detectors. One such, a good one, is the "Sideband
> Slicer" by Central Electronics. B&W built and sold one too. And there
> were others, including, of course, the Hammarlund HC-10.
> 
> I have never written up the modification of my BC-779, which I did
> many years ago, and since I do not, at the moment, have a working
> BC-779, I will not write or publish such an article until I can build
> and test one. I did the work on my own BC-779 some 60 years ago,
> and I have forgotten many of the crucial details.
> 
> Ken W7EKB
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL