FACTOID # 30: If Alaska were its own country, it would be the 26th largest in total area, slightly larger than Iran.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > 2182 kHz

The radio frequency of 2182 kilohertz (kHz) is the international calling and distress frequency for voice maritime communication (radio telephony) on the marine MF bands. It is analogous to Channel 16 on the marine VHF band. Mediumwave radio transmissions serves as the most common band for broadcasting. ... Portable VHF radio set Marine VHF radio is installed on all large ships and most motorized small craft. ...

Contents


Modulation

Transmissions on 2182 kHz should use single-sideband modulation (SSB) (upper sideband only). That said, Amplitude modulation (AM), and some variants in between the two, such as vestigial sideband, are still in use. These are used mainly by vessels with older equipment installed and by some coastal stations in an attempt to ensure compatibility with older and less sophisticated receivers afloat. Single-sideband modulation (SSB) is a refinement of the technique of amplitude modulation designed to be more efficient in its use of electrical power and bandwidth. ... In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, containing energy as a result of the modulation process. ... Amplitude modulation (AM) is a form of modulation in which the amplitude of a carrier wave is varied in direct proportion to that of a modulating signal. ...


GMDSS

2182 kHz forms an essential part of the Global Maritime Distress Safety System (GMDSS). It has an associated DSC frequency at 2187.5 kHz. The Global Maritime Distress Safety System (GMDSS) is an internationally agreed-upon set of safety procedures, types of equipment, and communication protocols used to increase safety and make it easier to rescue distressed ships, boats and aircraft. ... VHF radio is radio transmission in the 30-300 MHz frequency range, as a means of short-range, line-of-sight verbal communication. ...


Range

Unlike Marine VHF which is limited to about 50 nautical miles range, communications on 2182 kHz and nearby frequencies have a typical range of around 150 nautical miles during the day and 500 (or more) nautical miles at night. At night a well equiped station can achieve intra-continental communication, but this range can be severely limited at summer because of static caused by lightning. Look up static in Wiktionary, the free dictionary. ...


[1]. There are many other marine frequencies, including distress and calling frequencies, in the Marine HF bands, up to and including worldwide coverage with the right conditions. In addition to these, satellite technology can provide worldwide communications for vessels at sea too.


Licencing

In order to operate a marine radio tranceiver on 2182 kHz, the operator must hold a GMDSS Long Range Certificate, which requires success on a wider syllabus than that of the GMDSS Short Range Certificate that is necessary for Marine VHF use. In either case, though, an unqualified operator would not be prosecuted for the use of either rig in a what turns out to be a genuine distress situation.


See also


 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m