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The original allocation of channels consisted of only channels 1 to 28 with 50 kHz spacing between channels, and the second frequency for full-duplex operation 4.6 MHz higher. Improvements in radio technology later meant that the channel spacing could be reduced to 25 kHz with channels 60 to 88 interspersed between the original channels.
Baofeng UV-5R noframe: Technical data Frequency range [1] 136–174 MHz 400–520 MHz: Frequency steps 2.5–50k Hz Transmitter power output: 5 W PEP: Waveforms (modulations) FM: modulation rate: Power input Receiver only 20 mA, Transmitter 1 A max. Operating voltage 6.5 – 9 V, Nominal voltage 7.2 V: Measurements and weight High 140 mm Width ...
Channel 16 VHF (156.800 MHz) is a marine VHF radio frequency designated as an international distress frequency. [1] Primarily intended for distress , urgency and safety priority calls, the frequency may also carry routine calls used to establish communication before switching to another working channel.
The FCC cited the Houston, Texas based importer Amcrest Industries which owns and operates Baofeng radio US for illegally marketing UV-5R, "capable of operating outside the scope of its equipment authorization,” the FCC Citation said, which is outside of its Part 90 authorization granted. The FCC asserts Amcrest marketed "UV-5R-series FM hand ...
2182 kHz is a medium-wave frequency still used for marine emergency communication. Marine VHF radio is used in coastal waters and relatively short-range communication between vessels and to shore stations. Radios are channelized, with different channels used for different purposes; marine Channel 16 is used for calling and emergencies.
On 27 May 2011 the channel spacing on UHF CB was changed, allowing the band to expand from 40 channels to 80 channels. [8] Due to data channels 22 and 23 occupying 25 kHz bandwidth, the expansion effectively allows the use of 77 channels, as channels 61, 62 and 63 are reserved.
An auxiliary station, most often used for repeater control or link purposes or to remotely control another station, is limited in the United States to operation on frequencies above 144.5 MHz [16] excluding 144.0–144.5 MHz, 145.8–146.0 MHz, 219–220 MHz, 222.00–222.15 MHz, 431–433 MHz, and 435–438 MHz.
The interstitial frequencies are in-between the main channels, and the 462 MHz interstitial frequencies may be used for simplex as long as the effective radiated power does not exceed 5 watts. [14] The 467 MHz interstitial frequencies have a power limit of 500 milliwatts ERP , [ 15 ] and only hand-held portable units may transmit on these channels.
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