A Blast From the Past

[Qiaozhi]

All of the Practical Electronics magazines are archived here -> https://www.americanradiohistory.com...lectronics.htm

In particular, there's a BFO design from January 1969 (starting at magazine page 16 / PDF page 18 ) with an unusual search coil arrangement:
https://www.americanradiohistory.com...cs-1969-01.pdf

Also, if you go to the home page, there's enough info there to keep anyone busy for many hours -> https://www.americanradiohistory.com/index.htm

[Andi68]

Thenk you

[kt315]

Whistleblowers Claim We [they certainly, not we] Have Technology 1000 Years Ahead of Anything You See. will be a blast from the future?