here's some unusual electrical components. these are tone reeds. they're used in older radio equipment, such as public safety radios and ham radios. they are used to send or receive CTCSS tones. let's take one apart!pic.twitter.com/rgWOvnv2VZ
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CTCSS works by sending a tone (like 192.8Hz) along with my voice whenever i TX and key up my mic. the RX side's squelch (aka mute, so you don't hear white noise when nobody is talking) will stay muted unless it also hears that exact tone.
nowadays radios generate the tones digitally instead of using an actual, physical resonator. you can pick a wide variety of frequencies and you don't have to swap out the tone reed modules.
here's the motorola datasheet, surprisingly still hosted on their website. https://www.motorolasolutions.com/content/dam/msi/docs/en-xw/static_files/Related_-_Vibrasender_and_Vibrasponder_devices.pdf …
Just to be precise, anyone also using the same encoding (and these are usually standardize so you can cycle through them or visualize them on a scanner) can listen in. I hate it that FRS/GMRS radios call these “privacy codes” bc it’s not encrypted
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