[AMRadio] Spark gap transmitter


Bob Bruhns bbruhns at erols.com
Mon Nov 26 16:26:02 EST 2007


A DC buzzer.  When power is applied, it will make and break rapidly, transmitting a continuous noise when the switch is on, or when
the key is down.

I once connected a morse code practice key with such a buzzer, and a 1.5V D cell battery, to an antenna, and it was audible on the
AM broadcast band for several hundred feet.

   Bacon, WA3WDR


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