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The frequencies which would have been the second frequencies on half-duplex channels are not used for marine purposes and can be used for other purposes that vary by country. For example, 161.000 to 161.450 MHz are part of the allocation to the Association of American Railroads channels used by railways in the US and Canada.
NMEA 0183 is a combined electrical and data specification for communication between marine electronics such as echo sounder, sonars, anemometer, gyrocompass, autopilot, GPS receivers and many other types of instruments. It has been defined and is controlled by the National Marine Electronics Association (NMEA).
used before World War II three 287 metres, today active on higher frequency with an antenna of four masts with heights of 121 and 122 metres JXN: Gildeskål, Norway: 16.4 kHz: 7,759-foot (2,365 m) valley-span antenna VTX: Vijayanarayanam, India: 17.0 kHz
The KPH license and the frequencies assigned to it are made available to the MRHS by the license holder, Globe Wireless. In addition, the Federal Communications Commission (FCC) has granted the MRHS a new coast station license with the callsign KSM , as well as the amateur radio club callsign K6KPH for communicating with radio hams on amateur ...
A Battery: Eveready 742: 1.5 V: Metal tabs H: 101.6 L: 63.5 W: 63.5 Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threaded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.
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.