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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.
In 1945, TV channel 6 was assigned use of 82-88 MHz, [10] with the channel's audio located at a center frequency of 87.75 MHz. That same year the standard FM broadcasting band was reassigned to 80 channels from 88.1 to 105.9 MHz, which was soon expanded to 100 channels ending at 107.9 MHz (channels 201–300).
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 ...
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 ...
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.
2182 kHz is analogous to channel 16 on the marine VHF band, but unlike VHF which is limited to ranges of about 20 to 50 nautical miles (40 to 90 km) depending on antenna height, [3] communications on 2182 kHz and nearby frequencies have a reliable range of around 50 to 100 nautical miles (90 to 190 km) during the day and 150 to 300 nautical miles (280 to 560 km) or sometimes more at night.
In addition to these, the general purpose channel 156.000 MHz is available. 156.000 MHz is sometimes included as Marine VHF radio "channel 0" or "M1" (private) channel, allowing communication between portables and radios mounted in boats. Modulation is FM, maximal power 4 watts for 30–31 MHz and 5 watts for 155 MHz.