AM Signal Catcher

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This is a very simple and easy to build circuit of AM modulation monitoring for HAM transmitters. You don't have to make any connection with the transmitter only you have to do is that place the coil L1 near the final tank of antenna matching inductor until you hear the signal in the headphones.
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The circuit is very simple containing only four parts. L1 = coil 3 turns on 1.5 inch diameter former use any guage wire.
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