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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 ...
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 ...
Wireless telegraphy. A US Army Signal Corps radio operator in 1943 in New Guinea transmitting by radiotelegraphy. Wireless telegraphy or radiotelegraphy is transmission of text messages by radio waves, analogous to electrical telegraphy using cables. [ 1 ][ 2 ] Before about 1910, the term wireless telegraphy was also used for other experimental ...
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. This contrasts with using solids such as optical fiber cable .
Logitech Unifying receiver (older) Logitech Unifying receiver (newer) Unifying Logo The Logitech Unifying Receiver is a small dedicated USB wireless receiver, based on the nRF24L-family of RF devices, [1] that allows up to six compatible Logitech human interface devices (such as mice, trackballs, touchpads, and keyboards; headphones are not compatible) to be linked to the same computer using 2 ...
The universal asynchronous receiver-transmitter (UART) takes bytes of data and transmits the individual bits in a sequential fashion. [ 2] At the destination, a second UART re-assembles the bits into complete bytes. Each UART contains a shift register, which is the fundamental method of conversion between serial and parallel forms.
The transmitter also features low phase noise, coupled with low power consumption and a wide tuning range, improving the fidelity of the signal and enabling the device to be tuned to a range ...
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 ...
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