Matches in DBpedia 2016-04 for { <http://wikidata.dbpedia.org/resource/Q1931676> ?p ?o }
Showing triples 1 to 44 of
44
with 100 triples per page.
- Q1931676 subject Q449969.
- Q1931676 subject Q6898063.
- Q1931676 subject Q7579466.
- Q1931676 subject Q7850960.
- Q1931676 abstract "Since early in the 20th century, the radio frequency of 500 kilohertz (500 kHz) has been an international calling and distress frequency for Morse code maritime communication. The unit kilohertz was not introduced until the 1960s. For most of its history, the international distress frequency was referred to by its equivalent wavelength, 600 meters, or, using the earlier frequency unit name, 500 kilocycles (per second) or 500 kc.The United States Coast Guard and comparable agencies of other nations used to maintain 24-hour watches on this frequency, staffed by highly skilled radio operators. Many SOS calls and medical emergencies at sea were handled here until the late 1980s. However, because of the near disappearance of the commercial use of Morse code, the frequency is now rarely used. Emergency traffic on 500 kHz has been almost completely replaced by the Global Maritime Distress Safety System (GMDSS). Beginning in the late 1990s, most nations ended monitoring of transmissions on 500 kHz. The nearby frequencies of 518 kHz and 490 kHz are used for the Navtex component of GMDSS. Proposals to allocate frequencies at or near 500 kHz to amateur radio use resulted in the creation of the 600-meter amateur radio band.".
- Q1931676 wikiPageExternalLink 1906conv.htm.
- Q1931676 wikiPageExternalLink cw500pt1.html.
- Q1931676 wikiPageExternalLink 1914reg.htm.
- Q1931676 wikiPageExternalLink index.html.
- Q1931676 wikiPageExternalLink mcga-mld-page.htm?textobjid=43E2ED43ADD24D4A.
- Q1931676 wikiPageExternalLink Uksi_19920003_en_4.htm.
- Q1931676 wikiPageWikiLink Q11224.
- Q1931676 wikiPageWikiLink Q1363338.
- Q1931676 wikiPageWikiLink Q1474701.
- Q1931676 wikiPageWikiLink Q1756992.
- Q1931676 wikiPageWikiLink Q1776868.
- Q1931676 wikiPageWikiLink Q185727.
- Q1931676 wikiPageWikiLink Q1931155.
- Q1931676 wikiPageWikiLink Q20.
- Q1931676 wikiPageWikiLink Q203435.
- Q1931676 wikiPageWikiLink Q2039902.
- Q1931676 wikiPageWikiLink Q214266.
- Q1931676 wikiPageWikiLink Q2355426.
- Q1931676 wikiPageWikiLink Q250886.
- Q1931676 wikiPageWikiLink Q2577588.
- Q1931676 wikiPageWikiLink Q2815788.
- Q1931676 wikiPageWikiLink Q283777.
- Q1931676 wikiPageWikiLink Q3090451.
- Q1931676 wikiPageWikiLink Q31.
- Q1931676 wikiPageWikiLink Q39369.
- Q1931676 wikiPageWikiLink Q41364.
- Q1931676 wikiPageWikiLink Q449969.
- Q1931676 wikiPageWikiLink Q4698543.
- Q1931676 wikiPageWikiLink Q507696.
- Q1931676 wikiPageWikiLink Q5198171.
- Q1931676 wikiPageWikiLink Q664.
- Q1931676 wikiPageWikiLink Q6898063.
- Q1931676 wikiPageWikiLink Q7579466.
- Q1931676 wikiPageWikiLink Q7850960.
- Q1931676 wikiPageWikiLink Q79897.
- Q1931676 type Thing.
- Q1931676 comment "Since early in the 20th century, the radio frequency of 500 kilohertz (500 kHz) has been an international calling and distress frequency for Morse code maritime communication. The unit kilohertz was not introduced until the 1960s.".
- Q1931676 label "500 kHz".
- Q1931676 seeAlso Q250886.