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Ram Mukundan In my youth the popular tuning caps were 500 pF and 360 pF“}” data-reactid=”.25.1:4:1:$comment10207896076464324_10207899606712578/=10.0.$right.0.$left.0.3.$likeToggle/=10″ href=”https://www.facebook.com/michael.rainey.167?fref=nf#” role=”button” style=”color: #3b5998; cursor: pointer; text-decoration: none;” title=”Like this comment”>Like · Reply · 1 · 16 hrs
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Ram Mukundan Tuning coils’ bakelite formers were salvaged from old army radio equipment sold as a ragbag of parts in Moore Market, Chennai, India . The whole place burned down some decades ago, The detector was a Germanium OA79 diode. Everything fit into a washed and cleaned processed cheese can, except the piezoelectric earpiece and cord. I’ve listened to cricket test match commentaries sitting in a lean-to on the terrace of my parents’ house, the antenna being a 30-foot-long snake of wiremesh strung between two poles.“}” data-reactid=”.25.1:4:1:$comment10207896076464324_10207899612112713/=10.0.$right.0.$left.0.3.$likeToggle/=10″ href=”https://www.facebook.com/michael.rainey.167?fref=nf#” role=”button” style=”color: #3b5998; cursor: pointer; text-decoration: none;” title=”Like this comment”>Like · Reply · 1 · 16 hrs · Edited -
Michael Rainey Very nice, Ram! My childhood, homebrew crystal receiver used a ferrite-cored inductor and a 1N34a germanium diode. My antenna was strung from our house to the garage. I kept the radio on the nightstand next to my bed for listening to music, hockey and baseball games. Sorry OM, no cricket! wink emoticon I’ll always remember listening to the top 100 tunes of the 1960’s (radio station KXOK – 630kHz) on New Year’s Eve, 1970.
A Russian girl (presumably) listens to a nicely made crystal radio by Alexander Rodchenko’s (1929). Note the large-diameter air-cored inductor and cat’s whisker/galena.
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Bill Meara Michael: You were clearly destined to do great things in minimalist QRP radio. Bill
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