File:Radio room clock.jpg

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English: A quartz radio room clock, sold by Seldec Publishing, in own collection.
Français : Les montres marque le temps moyen de Greenwich en anglais Greenwich Mean Time, abrégé en GMT est remplacé par le Temps universel coordonné (UTC) en 1972 est une référence dans le monde, est le Temps au méridien de Greenwich; (méridien d'origine des longitudes). Traversant l’observatoire royal de Greenwich, près de Londres en Angleterre.
Montre de station radio marine avec :
En rouge les périodes de silence radio de 3 minutes sur la fréquence 500 kHz. L'appel de routine, de sécurité, d'urgence est autorisé entre l'heure H + 18 à H + 45 et entre H + 48 à H + 15.
En vert les périodes de silence radio de 3 minutes sur les fréquences: 2174,5 kHz , 2182 kHz et 2187,5 kHz. L'appel de routine, de sécurité, d'urgence est autorisé entre l'heure H + 03 à H + 30 et entre H + 33 à H + 00 .
Les radiocommunications pour la détresse sont libres.
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Author © 2009 K. Krallis (SV1XV)

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current08:53, 28 November 2009Thumbnail for version as of 08:53, 28 November 20091,024 × 1,024 (209 KB)Sv1xv (talk | contribs){{Information |Description={{en|1=A quartz radio room clock, sold by Seldec Publishing, in own collection.}} |Source={{Own}} |Author=© 2009 K. Krallis (SV1XV) |Date=2009-11-28 |Permission= |other_versions= }} [[Category:Radio room clo

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