This is from a short article in the April 1997 issue of Electric Radio magazine. The author is Bob Dennison, W2HBE. Bob is a real genius, and the author of many inspirational articles in ER.
The Sundt Engineering Company of Chicago was advertising this kind of device in the June 1936 issue of Short Wave Craft Magazine. Only two dollars (but that was big money in 1936). From Bob's article: "When the transmitter is modulated with a single audio tone, the waveform of the modulated carrier will be seen. By varying the motor speed (horizontal scan rate) the pattern can be synchronized or made to stand still. Percentage modulation is readily estimated by simple inspection of the display."
So here we have the perfect minimalist 'scope to go with a minimalist AM transmitter!
WHAT TO DO WITH 3CX3000F1
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A number of years back, I was at the Sussex Hamfest, and a 3cx3000f1 jumped
out at me and said 'Take me home'.
I had an idea of building an induction heate...
2 hours ago