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.
100000hz
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.
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.
At all airports, seaports, trains stations and bus stations which have interstate or foreign service.
Radar detectors don't "use" any frequencies. However they listen to certain frequencies known as bands(K, Ka, X, Ku). These bands are the frequencies allocated to radar guns to operate on.
Any radio signal, regardless of its frequency, can be amplitude-modulated in order to add information to it. In the US, commercial broadcast AM radio stations operate on carrier frequencies between 540 KHz and 1.7 MHz.
By allowing them to operate freely.