I built this very simple SAW transmitter, with a simple "spring" antenna for the right frequency. To test it, I tuned a portable receiver to around 433.92Mhz and fine tuned it until I heard silence. But I noticed that when tapped the board, the antenna would vibrate and I could hear the "boing!" in the receiver.

Why does this happen?

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    \$\begingroup\$ what is the mechanical coefficient of quartz to forces? \$\endgroup\$ – analogsystemsrf Mar 14 '19 at 3:10
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    \$\begingroup\$ lack of stiff substrate . SAW filters have piezo effects. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Mar 14 '19 at 3:30
  • \$\begingroup\$ Do you understand that SAW stands for "surface acoustic wave"? \$\endgroup\$ – Dave Tweed Mar 14 '19 at 13:36

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