[time-nuts] DCF77 signal change

[Ulrich Bangert]

Pou,

the German electronics magazine ELV does already sell small "weather
stations" that beneath measuring local parameters are said to "receive
weather information from satellite". I have been asking myself which
satellite could be used for such a purpose but your notice makes of
course everything understandable!

Best regards
Ulrich Bangert  

> -----Ursprüngliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Poul-Henning Kamp
> Gesendet: Mittwoch, 28. März 2007 19:36
> An: time-nuts at febo.com
> Betreff: [time-nuts] DCF77 signal change
> 
> 
> 
> I happened to notice this morning that my old "Conrad" DCF77 
> wall clock had not changed to summertime and indicated "no 
> lock" even though the pulses looked good to my eye.
> 
> After about I minute I noticed that the first 14 pulses were 
> no longer uniform '0' bits, and a bit of googleing turned up 
> the interesting news that there is now weather information 
> embedded in the first 14 bits.
> 
http://www.meteotime.com/web/de/System/Default.aspx

        0         1         2         3         4         5
	012345678901234567890123456789012345678901234567890123456789
	-#--#---#--####--#--#--#--#--#--##-#---#-###-##---###-----#
	--#----#--####---#--##-#--#-##--##-#---#-###-##---###-----#
	-##--#-#-##-#----#--#-##--#-##--##-#---#-###-##---###-----#
	--###-##-##-#----#--####--#--#--##-#---#-###-##---###-----#
	---#-----#-#-#---#--#---#-#--#--##-#---#-###-##---###-----#
	-#------#--#-##--#--##--#-#-##--##-#---#-###-##---###-----#
	-#-----#--##-#---#--#----##--#--##-#---#-###-##---###-----#
	--#--#----#####--#--##---##-##--##-#---#-###-##---###-----#
         ^^^^^^^^^^^^^^

Obviously, my clock is so old that it was writte for the older "if you
see any of these bits, the transmitter has problems" signal spec.

Anyone know the encoding of the weather info ?  I wonder if they use the
minute bits to designate regions to save bits ?

Poul-Henning

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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