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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.
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 ...
For much of the 20th century, 500 kHz was the primary international distress frequency. Its use has been phased out in favor of the Global Maritime Distress Safety System. Use of some distress frequencies is permitted for calling other stations to establish contact, whereupon the stations move to another frequency.
The transmitter component was the BC-778. The frequency was 500 kHz at 4.8 watts, giving it a range of 200 miles (300 km; 200 nmi). Keying could be automatic SOS (including the 4-second long dash for autoalarm), or manual. Crystals for frequency control were a scarce item for the U.S. during the war and the SCR-578 was not crystal-controlled.
These demodulate the signal from a modified marine VHF radiotelephone tuned to the AIS frequencies and convert into a digital format that the computer can read and display on a monitor; this data may then be shared via a local or wide area network but will still be limited to the collective range of the radio receivers used in the network. [3]