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2. Broadcast signal intrusion - Wikipedia

   en.wikipedia.org/wiki/Broadcast_signal_intrusion

   In September 1985, four astronomers at Poland's University of Toruń (Zygmunt Turło, Leszek Zaleski, Piotr Łukaszewski, and Jan Hanasz) used a ZX Spectrum home computer, a synchronizing circuit, and a transmitter to superimpose messages in support of the labor movement Solidarność over state-run television broadcasts in Toruń, including an ...

3. FM transmitter (personal device) - Wikipedia

   en.wikipedia.org/wiki/FM_transmitter_(personal...

   A personal FM transmitter is a low-power FM radio transmitter that broadcasts a signal from a portable audio device (such as an MP3 player) to a standard FM radio. Most of these transmitters plug into the device's headphone jack and then broadcast the signal over an FM broadcast band frequency, so that it can be picked up by any nearby radio.

4. MIMO - Wikipedia

   en.wikipedia.org/wiki/MIMO

   A known signal is sent to the mobile device that enables it to build a picture of the channel environment. The mobile device sends back the channel characteristics to the transmitter. The transmitter can then apply the correct phase and amplitude adjustments to form a beam directed at the mobile device. This is called a closed-loop MIMO system.

5. Wireless telegraphy - Wikipedia

   en.wikipedia.org/wiki/Wireless_telegraphy

   Wireless telegraphy or radiotelegraphy, commonly called CW (continuous wave), ICW (interrupted continuous wave) transmission, or on-off keying, and designated by the International Telecommunication Union as emission type A1A or A2A, is a radio communication method.

6. Free-space optical communication - Wikipedia

   en.wikipedia.org/wiki/Free-space_optical...

   At the top right corner is a monocular for assisting the alignment of the two heads. Free-space optical communication ( FSO) is an optical communication technology that uses light propagating in free space to wirelessly transmit data for telecommunications or computer networking. "Free space" means air, outer space, vacuum, or something similar.

7. Spark-gap transmitter - Wikipedia

   en.wikipedia.org/wiki/Spark-gap_transmitter

   The spark gap is inside the box with the transparent cover at top center. A spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark. [ 1][ 2] Spark-gap transmitters were the first type of radio transmitter, and were the main type used during the wireless telegraphy or "spark" era ...

8. Private WiFi | 30-Day Free* Trial | AOL Products

   www.aol.com/products/security/private-wifi

   before the free-trial period ends – it’s just $4.99/month afterwards and covers up to 10 devices. Windows: Windows 10 and above. Mac: macOS 10.10 and above. iOS: iOS 14 and above. Android ...

9. WSPR (amateur radio software) - Wikipedia

   en.wikipedia.org/wiki/WSPR_(amateur_radio_software)

   WSPR (pronounced "whisper") is an acronym for Weak Signal Propagation Reporter. It is a protocol, implemented in a computer program, used for weak- signal radio communication between amateur radio operators. The protocol was designed, and a program written initially, by Joe Taylor, K1JT. The software code is now open source and is developed by ...