How about if I use a cheap am/fm radio to tune a circuit to one
frequency, and use another cheap am/fm radio that I tune to the same
frequency, and feed the tuned signal into the antenna circuit of the
other, that would give me a cascade wouldn't it? I'm just worried
that the amplifier circuit of the other will act to dampen the
output, so I'm thinking of just using the tuning loop by itself, and
have it excited by the output of the first LCR tuning loop.
Antenna, then LCR1 output to the antenna2. I think that should work.
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What makes you think that Tesla
(a) knew nothing about frequencies?
(b) had a need or reason to measure frequencies?
(c) had anything like the FCC breathing down his back?
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One might make use of a radio to get an approximate indication of the
frequency of an RF signal in the band(s) it can receive.
For lower frequencies, one might use a non-linear device to create
multiples of that frequency and use such a radio to derive the initial
frequency.
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The description of that "scheme" of using two radios shows that (a)
you do not know how a radio works, and (b) you know little about
electronics, if anything.