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Selectivity is a measure of the performance of a radio receiver to respond only to the radio signal it is tuned to (such as a radio station) and reject other signals nearby in frequency, such as another broadcast on an adjacent channel.
List of AM radio stations in the United States by call sign (initial letters KA–KF) List of AM radio stations in the United States by call sign (initial letters KG–KM) List of AM radio stations in the United States by call sign (initial letters KN–KS) List of AM radio stations in the United States by call sign (initial letters KT–KZ)
Selectivity (radio), a measure of the performance of a radio receiver to respond only to the radio signal it is tuned; Selectivity (circuit breakers), the coordination of overcurrent protection devices in an electrical installation
Following is a list of FCC-licensed community radio stations in the United States, including both full-power and low-power non-commercial educational services. The list is divided into two sections: Full-power community stations; Low-power community stations
Stations could optionally choose to keep the -DT suffix. [9] Most stations did not keep the -DT suffix. [10] For US analog stations, the -TV suffix was required if there was a radio station with the same three- or four-letter callsign. Stations not required to use the -TV suffix may optionally request it if desired.
Selective calling is akin to the use of a lock on a door. A radio with carrier squelch is unlocked and will let any signal in. Selective calling locks out all signals except ones with the correct "key", in this case a specific digital code. Selective calling systems can overlap; e.g. a radio may have CTCSS and DTMF calling.
The last new three-letter call was assigned to station WIS (now WVOC) in Columbia, South Carolina on January 23, 1930. Since then, three-letter calls have only been assigned to stations, including FM (beginning in 1943) [1] and TV (beginning in 1946), [2] which are historically related to an AM station that was originally issued that call sign.
In the United States, FM broadcasting stations currently are assigned to 101 channels, designated 87.9 to 107.9 MHz, within a 20.2 MHz-wide frequency band, spanning 87.8–108.0 MHz. In the 1930s investigations were begun into establishing radio stations transmitting on "Very High Frequency" (VHF) assignments above 30 MHz.