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This e-book serves as a guide for four of the most typical standards in the Americas — Digital Mobile Radio (DMR), NXDN, Project 25 (P25) and TETRA. In addition, digital Private Mobile Radio (dPMR) technology is beginning to expand into some South American markets.
19 Αυγ 2024 · Weekly radio reach in the United States as of June 2023, by time of day, gender, and age group
1 Δεκ 2014 · This updated Digital Radio Guide focuses primarily on the various digital radio systems in operation today and their associated standards.
23 Οκτ 2013 · Is there a digital mode band plan for the HF bands, to the level of which modes are commonly used on what frequencies? I live in the United States. Where in the world are you located? If nothing else, the answer will depend heavily on which region you belong to, since the frequency allocations to amateur radio differ between parts of the world.
9 Σεπ 2024 · There are over 15,445 radio stations in the U.S., all competing for a piece of this massive market. Online radio is also playing an increasing role in the radio market, with an estimated...
In the United States, digital radio is broadcast using in-band on-channel technology. This enables radio stations to broadcast their regular FM or AM signal and their digital signal at the same frequency. In other words, a station at 88.7 FM would have a digital signal at 88.7 FM on a digital radio. Digital Radio (pdf)
These radios are a bit more affordable and designed to be more Ham Friendly. Where an analog signal will lose quality and readability as the signal strength is decreased, a digitally processed signal will remain clear until the signal is lost. Where the bandwidth of an Analog FM signal is 25.0 kHz, the DMR (TDMA) bandwidth is only 12.5 kHz.
