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Phase-shift keying (PSK) All convey data by changing some aspect of a base signal, the carrier wave (usually a sinusoid), in response to a data signal. In the case of PSK, the phase is changed to represent the data signal. There are two fundamental ways of utilizing the phase of a signal in this way:
A decoder for PI4 is available in the PI-RX program developed by Poul-Erik Hansen, OZ1CKG. DTMF was initially developed for telephone line signaling. It is frequently used for telecommand (remote control) applications over VHF and UHF voice channels.
DVB-Flexible Serially Concatenated Convolutional Turbo Codes with Near-Shannon bound performance for telemetry applications, CCSDS-131.2-O-1. Xiang, Xingyu; Valenti, Matthew C (2012-10-17). "Closing the Gap to the Capacity of APSK: Constellation Shaping and Degree Distributions".
QSOMate is a logger for the Apple ecosystem, focusing on simple logging and integrations. Currently has integrations with Straight Key Century Club (SKCC), HamDB, Parks on the Air, and Summits on the Air. Xlog: Open-Source (GPL-3.0) Linux Xlog is an easy to use program for logging your ham radio contacts.
Early models of key finder were sound-based, and listened for a clap or whistle (or a sequence of same), then beeped for the user to find them. Determining what was a clap or a whistle proved difficult, resulting in poor performance and false alarms. Because of this low quality and unreliability, these early key finders were soon discarded and ...
To prevent this, the key fob does not use the same unlock code each time but a rolling code system; it contains a pseudorandom number generator which transmits a different code each use. [9] The car's receiver has another pseudorandom number generator synchronized to the fob to recognise the code.
An example of binary FSK. Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is encoded on a carrier signal by periodically shifting the frequency of the carrier between several discrete frequencies. [1]
In digital modulation, minimum-shift keying (MSK) is a type of continuous-phase frequency-shift keying that was developed in the late 1950s by Collins Radio employees Melvin L. Doelz and Earl T. Heald. [1]