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O sinal de tempo
Generalidades
O relógio controlado via rádio integrado na estação meteorológica recebe os seus
sinais de rádio de um emissor DCF77. Este emite, na sua frequência de onda larga de
77,5 kHz, a hora oficial exacta da República Federal da Alemanha.
O emissor encontra-se em Mainflingen perto de Frankfurt am Main e, com o seu alcance
de até 2.000 km, emite os sinais de rádio necessários à grande maioria dos relógios con-
trolados por rádio na Europa Ocidental.
Assim que a estação base estiver a funcionar com as pilhas, esta passa ao modo de
recepção e procura o sinal do emissor DCF77. Quando o sinal tiver sido recebido com
força suficiente pela antena em ferrite incorporada no despertador, irá aparecer no
visor a data e a hora.
A estação base liga-se várias vezes ao dia e sincroniza a sua hora com o sinal de rádio
do emissor DCF77. No caso de uma não recepção, por exemplo aquando de fortes tro-
voadas, o aparelho continua a funcionar e liga então automaticamente para recepção
na próxima hora prevista.
FW Station Aldi PT.book Seite 24 Dienstag, 5. August 2014 8:49 08
24


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