[Hammarlund] Product Detectors.

[Kenneth G. Gordon]

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