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An Icom IC-R5 hand-held scanner A GMRS radio that also has scanning capabilities. A scanner (also referred to as a radio scanner) is a radio receiver that can automatically tune, or scan, two or more discrete frequencies, stopping when it finds a signal on one of them and then continuing to scan other frequencies when the initial transmission ceases.
Radio Data System display of an FM Radio station from Spain. The following information fields are normally contained in the RDS data: AF (alternative frequencies list) This provides the receiver with a list of frequencies that allows a receiver to re-tune to a different frequency providing the same station when the first signal becomes too weak ...
Data collected by HawkEye 360 is used to monitor high-risk regions for unusual activity. For instance, HawkEye 360 observed increased RF activity in the Galwan River Valley off the China-India border, which enabled tasking of Earth observation imagery that revealed a Chinese military buildup in the area that was contributing to regional unrest ...
Below about 10 kHz (a wavelength of 30 km), elevated wire antennas kilometers in diameter are required, so very few radio systems use frequencies below this. A second limit is the decreasing bandwidth available at low frequencies, which limits the data rate that can be transmitted. [6]
Frequency accuracy ppm Panadapters / Receivers Host Interface Windows Linux Mac FPGA Aaronia SPECTRAN V6 ECO [1] €2,498 EUR Pre-built Active 9 kHz – 8 GHz Up to 120 MHz (2 Rx with 60 MHz each) 16 14 Yes 2 GSPS 0.005 (OCXO option) 2/1 Embedded or True IQ data via 1 x USB 3.1 GEN 1. Internet remote via HTTP / JSON Yes Yes No
A trunked radio system is a two-way radio system that uses a control channel to automatically assign frequency channels to groups of user radios. In a traditional half-duplex land mobile radio system a group of users (a talkgroup ) with mobile and portable two-way radios communicate over a single shared radio channel, with one user at a time ...
In the United States, the business band is the colloquial name used by radio users who utilize and scanner hobbyists who listen to the Federal Communications Commission (FCC) Industrial/Business pool frequencies. The regulations listing frequencies in this pool are contained in Subpart C of Part 90, Title 47 of the CFR.
Data transmission may make use of encrypted RTTY, use Link-11 for radar tracking data, or use of Automatic Link Establishment (ALE) modes to set up communication links automatically. Some utility stations are on other frequency bands, including NOAA Weather Radio , traveler information stations , and the like; other utility-type signals are ...