Amateur radio spread spectrum frequencies
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The use of spread spectrum communications began in the amateur radio service in march 1981 when the fcc issued a special temporary authority (sta) to amrad. W4ri and k2sze made the premiere hf contact using frequency hopping. Other methods of spread spectrum sweep the carrier frequency up or down the amateur band with specified timing and shift the phase of the carrier, and yet others use a repeating sequence rather than a continuing pseudo-randomized algorithm. A pulsed rf carrier can also be used to affect time multiplexed signals, often combined with frequency hopping in a hybrid technique of spread spectrum. In telecommunication and radio communication, spread-spectrum techniques are methods by which a signal (e. , an electrical, electromagnetic, or acoustic signal) generated with a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. These techniques are used for a variety of reasons, including the establishment of secure. This is the ham radio spread spectrum page for spread spectrum scene online and rf spread spectrum consulting -- the one stop source of information on spread spectrum. In a report and order adopted february 22 and released march 4, 2011, the federal communications commission has eliminated the requirement that amateur stations transmitting spread spectrum use automatic power control (apc) to reduce transmitter power. 25m amateur radio equipment (sta) 420 mhz - 450 mhz 70cm amateur radio equipment (47 usc 97.). Twenty-nine small frequency bands throughout the spectrum are allocated to this service internationally. Some 1,300 digital, analog, pulse, and spread-spectrum emission types may be transmitted. Millions of amateur operators in all areas of the world communicate with each other directly or through ad hoc relay systems and amateur-satellites. Amateur radio frequency allocation is done by national telecommunication authorities. Globally, the international telecommunication union (itu) oversees how much radio spectrum is set aside for amateur radio transmissions. Individual amateur stations are free to use any frequency within authorized frequency ranges authorized bands may vary by the class of the station license. Spread spectrum is a radio technique that continuously alters its transmission pattern either by constantly changing carrier frequencies or by constantly changing the data pattern.
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