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Nederlands Forum over Oude Radio's |
Aanvulling: CONELRAD
Geschreven door Gerard op 26. Jan 2007 14:56:33:
In reactie op: 2x schaalplaat geschreven door Eric Span'berg op 25. Jan 2007 18:30:41:
Velen kennen wellicht de kreet CONELRAD maar voor wie het nog niet weten
hier iets over de driehoekjes die je op Amerikaanse schalen vindt op
640 en 1240 kc.
The CONELRAD Defence System and Marking
In the early fifties the American military became obsessed by the fear
that the Soviets would nuke the States by missiles navigating using the
many American MW broadcasting stations. As a counter measure, it was
decided that in case of a nuclear attack all stations would abandon
normal operation, and change to one of the frequencies 640kHz or 1240kHz
to inform the public about measures being taken. This system of CONtrol
of ELectromagnetic RADiation was called CONELRAD.As part of the system it became obligatory for all radios sold in the US
after 1953, that the CONELRAD frequencies 640/1240 kHz were marked with
triangles on the dial. The triangles were referred to as CD marks, for
Civil Defense. We find the triangles on American radios from that year
and later. like this RCA Victor 5-X-560:
http://www.cs.uu.nl/~gerard/RadioCorner/Sets/RCA560.htm
but also on portables produced in other countries but marketed in the US:
http://www.cs.uu.nl/~gerard/RadioCorner/Sets/Hit1002.htm
The obligation was lifted in 1963, but the markings are found incidentally
on later radios.
- Re: Aanvulling: CONELRAD Piet Blaas 27.1.2007 11:35 (2)
- Re: Aanvulling: CONELRAD John Hupse 27.1.2007 15:26 (1)
- Re: Aanvulling: CONELRAD Ad Blommestein 27.1.2007 16:03 (0)