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Commercial and Government Radio Stations of the U.S. (6/30/1927), pages 87–92 7/1/1927 Call letters: Annual Report of the FRC (6/30/1927), pages 55–64 11/1/1927 Frequency: Jurisdiction of Radio Commission (2/1928), pages 14–17 Frequencies from 600 to 1000 kHz 12/1/1927 Frequency: Jurisdiction of Radio Commission (2/1928), pages 10–12
In the Americas (defined as International Telecommunication Union (ITU) region 2), the FM broadcast band consists of 101 channels, each 200 kHz wide, in the frequency range from 87.8 to 108.0 MHz, with "center frequencies" running from 87.9 MHz to 107.9 MHz.
Note: Information in the chart has been superseded by the information in File:United States Frequency Allocations Chart 2016 - The Radio Spectrum.pdf, which was downloaded from the US Department of Commerce web site and archived at archive.org.
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Armstrong charged that this reassignment had the covert goal of disrupting FM radio development, [10] however RCA's proposal prevailed, and on June 27, 1945 the FCC announced the reassignment of the FM band to 80 channels from 88–106 MHz (which was soon expanded to 100 channels from 88–108 MHz), while allocating the former FM band ...
The code originated with the CCIR (a predecessor to the ITU-R) in 1951, and was widely used by BBC shortwave listeners to submit signal reports, with many going so far as to mail audio recordings to the BBC's offices. [2] SINPO and SINPFEMO are the official signal reporting codes for international civil aviation [3] and ITU-R. [1]
An ARRL Numbered Radiogram is a brevity code used in composing ARRL Radiograms during times of radio congestion.. The code is used to transmit standard messages, sometimes with customized text, very quickly by experienced ARRL National Traffic System (NTS) message traffic handlers.