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A DMR Tier I radio would only use the PMR446 licence–free frequencies, and would have a maximum transmitted power of 0.5 watts as required by law for all PMR446 radios. [5] Although the DMR standard allows Tier I DMR radios to use continuous transmission mode, all known Tier I radios currently use TDMA, the same as Tier II.
Morse code is called the original digital mode. Radio telegraphy, designed for machine-to-machine communication is the direct on / off keying of a continuous wave carrier by Morse code symbols, often called amplitude-shift keying or ASK, may be considered to be an amplitude modulated mode of communications, and is rightfully considered the first digital data mode.
Over seventy broadcasters are now transmitting programs using the new standard, known as Digital Radio Mondiale (DRM), and / commercial DRM receivers are available (though there are few models on the DRM website and some are discontinued). DRM's system uses the MPEG-4 based standard aacPlus to code the music and CELP or HVXC for speech programs ...
With a small hardware modification, TYT MD-380, MD-390 and MD-UV380 handheld transceivers can be flashed with a custom, free, open source firmware [12] to enable M17 support. In July 2024, a US-based company Connect Systems, Inc. released the CS7000-M17, being the first commercial off-the-shelf handheld transceiver with native M17 support. [13]
CTCSS is an analog system. A later Digital-Coded Squelch (DCS) system was developed by Motorola under the trademarked name Digital Private Line (DPL). General Electric responded with the same system under the name of Digital Channel Guard (DCG).
About six weeks ago, after my weekly pickleball league, I awoke to a stabbing pain in my right heel. I'd had knee pain, a jammed thumb, and other ouchies from my favorite sport, but never this ...
Software License Operating Systems Features Amateur Contact Log by N3FJP Proprietary Windows Logging, Transceiver control, Callbook lookup, QSL handling (Hardcopy / LoTW / eQSL / Club Log), Awards, DX Spots, Digital Modes
Police are praising the heroic actions of a local pilot who confronted and stopped a 15-year-old who entered Texarkana Regional Airport in Arkansas on Tuesday, brandishing guns and demanding a plane.