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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.
Very high frequency ... VHF radio is also used for marine Radio [6] ... The analog audio for TV channel 6 is broadcast at 87.75 MHz (adjustable down to 87.74). ...
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.
National weather radio frequencies for U.S., Canada, and Mexico # WX8-WX12 frequency order and inclusion varies; Frequency WX channel [1] Marine channel Radio preset 162.400 MHz: WX2 36B 1 162.425 MHz: WX4 96B 2 162.450 MHz: WX5 37B 3 162.475 MHz: WX3 97B 4 162.500 MHz: WX6 38B 5 162.525 MHz: WX7 98B 6 162.550 MHz: WX1 39B 7 161.650 MHz WX# 21B ...
The Pan-American television frequencies are different for terrestrial and cable television systems. Terrestrial television channels are divided into two bands: the VHF band which comprises channels 2 through 13 and occupies frequencies between 54 and 216 MHz, and the UHF band, which comprises channels 14 through 36 and occupies frequencies between 470 and 608 MHz.
A Yaesu FT-857D tuned to 50.125 MHz, the traditional 6-meter single-sideband calling frequency in the United States. [1] The 6-meter band is the lowest portion of the very high frequency (VHF) radio spectrum (50.000-54.000 MHz) internationally allocated to amateur radio use. The term refers to the average signal wavelength of 6 meters. [a]
When used within 105 miles (169 kilometers) of a TV transmitter operating on channel 13 or within 80 miles (129 kilometers) of a TV transmitter operating on channel 10, the FCC requires a plan to limit interference of such TV signals by both base stations and mobile units. [7] As such, maximum transmit power may be below 1,000 watts ERP.
Besides broadcast messages, Coast Guard stations handle direct traffic between aircraft, cutters, boats, and shore stations on VHF, MF, and HF frequencies, including the HF Data Link encrypted e-mail system and Digital Selective Calling (DSC), which uses radio telephone to send digitally encrypted signals to either one receiver or a group or ...