I've scanned the schematics from JRC's NRD-505 Instruction Manual and posted them on my NRD-505 fanboy site under "Links and Downloads" as a PDF download.
Spark Gaps and Coherers demonstrated and Measured by CuriousMarc
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*CuriousMarc provides a good demonstration of how spark transmitters work
with coherer detectors. His measurements are really illuminating. His
device j...
12 hours ago






(From 1978 WRTH)