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Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many frequencies occupying a large spectral band. The changes are controlled by a code known to both transmitter and receiver .
Other applications include antenna testing, frequency stability and frequency accuracy checking. Usually a WSPR station contains a computer and a transceiver, but it is also possible to build very simple beacon transmitters with little effort. For example a simple WSPR beacon can be built using the Si 570, [5] or Si 5351. [6]
The project received a grant from the Amateur Radio Digital Communications in 2021 [7] and 2022. [8] The protocol has been integrated into several hardware and software projects. [ citation needed ] In 2021, Kaczmarski received the ARRL Technical Innovation Award for developing an open-source digital radio communication protocol, leading to ...
Practical synchronous digital systems radiate electromagnetic energy on a number of narrow bands spread on the clock frequency and its harmonics, resulting in a frequency spectrum that, at certain frequencies, can exceed the regulatory limits for electromagnetic interference (e.g. those of the FCC in the United States, JEITA in Japan and the ...
Frequency agility is the ability of a radar system to quickly shift its operating frequency to account for atmospheric effects, jamming, mutual interference with friendly sources, or to make it more difficult to locate the radar broadcaster through radio direction finding.
It usually performs 1600 hops per second, with adaptive frequency-hopping (AFH) enabled. [25] Bluetooth Low Energy uses 2 MHz spacing, which accommodates 40 channels. [26] Originally, Gaussian frequency-shift keying (GFSK) modulation was the only modulation scheme available.
Essentially a UK equivalent of the US AN/PRC-150, it has had the proprietary Harris Citadel encryption from the original RF-5800H replaced with UK Type 1 (Pritchel) encryption and frequency hopping waveform. The Falcon II's original dual-band HF/VHF frequency range (1.6-60 MHz) has been narrowed to the 1.6-30 MHz (HF) band.
A spreading code is a pseudo-random code in the time domain that has a narrow ambiguity function in the frequency domain, unlike other narrow pulse codes. In CDMA a locally generated code runs at a much higher rate than the data to be transmitted.