Bazsites.com Channel And Frequency Guides

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VHF Marine Radio Channels and Frequencies - U.S. VHF Marine Radio Channels and Frequencies Commandant (G-SCT-2) U.S. Coast Guard
HF Radiotelephone Channels - Complete duplex and simplex channel plan available for download.
US Coast Guard NAVTEX - Information about worldwide NAVTEX coverage.

Channel spacing - Channel spacing is a term used in radio frequency planning. It describes the frequency difference between adjacent allocations in a frequency plan.
SOFAR channel - The SOFAR channel (sound fixing and ranging channel), or deep sound channel (DSC), is a region of water deep in the ocean centered on where the speed of sound is at a minimum. The SOFAR channel acts as a waveguide for acoustics, and low frequency sound waves within the channel may travel thousands of miles ...
Virtual channel - In telecommunications, a logical channel number (LCN), also known as virtual channel in North America, is a channel designation which differs from the actual radio channel or frequency on which the signal travels.
Center frequency - In electrical engineering and telecommunications, the center frequency of a filter or channel is a measure of a central frequency between the upper and lower cutoff frequencies. It is usually defined as either the arithmetic mean or the geometric mean of the lower cutoff frequency and the upper cutoff frequency of a band-pass system or a band-stop system.
12-channel carrier system - 12 channel carrier system is a type of Frequency-division multiplexing system. In this system twelve voice channels are multiplexed in a High Frequency Carrier and passed through Trunk lines.