Agreements allowing CAP stations to operate on non-CAP frequencies must be from a licensed agency.
In the USA ... -- Commercial AM radio stations operate with carrier frequencies spaced every 10 KHz between 550 KHz and 1700 KHz. -- Commercial FM radio stations operate with carrier frequencies spaced every 200 KHz between 88.1 MHz and 107.9 MHz.
Commercial AM broadcast stations are licensed to operate on carrier frequencies spaced every 10 KHz across the AM band ... 560, 570, 580, ... 1570, 1580, 1590, etc. But typical consumer-grade AM receivers can't separate two strong local signals that are only 10 KHz apart, so there are never two stations licensed that close together in the same city.
AM station transmitters can operate at lower frequencies, allowing their signals to travel longer distances, especially at night when atmospheric conditions enhance propagation. The longer wavelengths of AM signals can diffract around obstacles and follow the curvature of the Earth, making them more effective for long-range transmission. In contrast, FM signals have higher frequencies with shorter wavelengths, which tend to travel in a more line-of-sight manner, limiting their range and effectiveness over long distances.
PBS, or the Public Broadcasting Service, primarily broadcasts in the United States through a network of member stations. These stations operate on various channels, including over-the-air broadcasts, cable, and satellite services. PBS also offers streaming options through its website and PBS app, allowing viewers to access content online. Additionally, PBS programming may be available internationally through certain partnerships and agreements.
Airband, a group of frequencies in the VHF radio spectrum, uses the frequencies between 108 and 137 megahertz. A license is required to operate airband equipment.
The frequency that falls in the range of RF waves used by commercial radio broadcasting stations is 3 kHz to 300 GHz. This is the frequency of radio waves and the alternating currents that carry them.
Each country has different frequency bands allocated for AM and FM radio. In the U.S. AM takes up the range from 535KHz to 1605KHz. FM radio takes 88.0MHz to 108.0MHz.Each radio station then receives a slice of that frequency band, regulated by the FCC. Each station is typically given a frequency far from all other stations. For example, three stations would be given the frequencies 93.3MHz, 94.5MHz and 96.1MHz. In theory, the stations could be closer (ie 94.3MHz, 94.5MHz and 94.7MHz) though this is rarely done because each station would then cause more interference to its neighbors.(The stations don't actually 'cause interference' to their neighbors. The weaknessis the ability of consumer-grade receivers to separate stations whose frequenciesare close together.)
"Longer wavelength" always means lower frequency.
At all airports, seaports, trains stations and bus stations which have interstate or foreign service.
Radar can operate at frequencies as high as the terahertz range, which is typically between 300 GHz and 3 THz. These high frequencies allow for higher resolution imaging and detection capabilities compared to lower frequency radar systems.
No. The satellites used to distribute Sirius/XM "satellite" radio operate on frequencies assigned to Sirius/XM "satellite" radio. They don't operate on frequencies allocated to the GPS system.
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