[CW] Beautiful Pictures and Interesting Words about Radio

[D.J.J. Ring, Jr.]

It is off topic because this type of radio receiver cannot receive CW -
continuous wave keyed Morse signals.

They can receive spark - and a small spark generator (buzzer) is used to
tune up the crystal detector!

I could not pass this by without telling you all about it.

http://www.r-type.org/static/crystal.htm

73

DR
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