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2. HD Radio - Wikipedia

   en.wikipedia.org/wiki/HD_Radio

   Minnesota Public Radio offers a few services: KNOW-FM, the MPR News station in the Twin Cities, offers music service Radio Heartland on 91.1 FM‑HD2 and additional news programming called "BBC News and More" on 91.1 FM‑HD3; KSJN-FM, the classical MPR station in the Twin Cities, provides "Classical 24" service on 99.5 FM‑HD2; and KCMP-FM ...

3. USB-C - Wikipedia

   en.wikipedia.org/wiki/USB-C

   USB-C plug USB-C (SuperSpeed USB 5Gbps) receptacle on a laptop. USB-C, or USB Type-C, is a 24-pin, reversible connector (not a protocol) that supersedes previous USB connectors and can carry audio, video, and other data, to connect to monitors, external drives, hubs/docking stations, mobile phones, and many more peripheral devices.

4. Bluetooth Low Energy beacon - Wikipedia

   en.wikipedia.org/wiki/Bluetooth_low_energy_beacon

   Thus only the installed app, and not the Bluetooth beacon transmitter, can track users. Bluetooth beacon transmitters come in a variety of form factors, including small coin cell devices, USB sticks, and generic Bluetooth 4.0 capable USB dongles. [7]

5. Bluetooth - Wikipedia

   en.wikipedia.org/wiki/Bluetooth

   While some desktop computers and most recent laptops come with a built-in Bluetooth radio, others require an external adapter, typically in the form of a small USB "dongle". Unlike its predecessor, IrDA , which requires a separate adapter for each device, Bluetooth lets multiple devices communicate with a computer over a single adapter.

6. The Thing (listening device) - Wikipedia

   en.wikipedia.org/wiki/The_Thing_(listening_device)

   The device, a passive cavity resonator, became active only when a radio signal of the correct frequency was sent to the device from an external transmitter. This is referred to in NSA parlance as "illuminating" a passive device. Sound waves (from voices inside the ambassador's office) passed through the thin wood case, striking the membrane and ...

7. Faraday cage - Wikipedia

   en.wikipedia.org/wiki/Faraday_cage

   The reception or transmission of radio waves, a form of electromagnetic radiation, to or from an antenna within a Faraday cage is heavily attenuated or blocked by the cage; however, a Faraday cage has varied attenuation depending on wave form, frequency, or the distance from receiver or transmitter, and receiver or transmitter power.

8. FM broadcasting in the United States - Wikipedia

   en.wikipedia.org/wiki/FM_broadcasting_in_the...

   FM audio for analog television channel 6 is broadcast at a carrier frequency of 87.75 MHz, and many radios can tune this low; full-power stations ceased analog operations in 2009 under FCC orders, but a very small amount of low-power stations are still operated solely for their right to use this frequency for broadcasting an FM audio carrier ...

9. Radio - Wikipedia

   en.wikipedia.org/wiki/Radio

   Keyless entry system – a short-range handheld battery powered key fob transmitter, included with most modern cars, which can lock and unlock the doors of a vehicle from outside, eliminating the need to use a key. When a button is pressed, the transmitter sends a coded radio signal to a receiver in the vehicle, operating the locks.