[ntp:questions] Re: Clock accuracy & auto setting : digital television does a crap job of providing time services...

Marc Brett marc at fordson.demon.co.uk
Fri Apr 21 07:40:57 UTC 2006


On Thu, 20 Apr 2006 22:49:52 -0700, "Max Power" <mikehack at u.washington.edu>
wrote:
>>i think my Sanyo HDTV switches to analog to set clock.
>>
>> ATSC time is always late ?
>
>ATSC and DVB-T (DVB in general) are devoid of a 64 bit (or 80 bit) clock 
>packet (based on NTP and 'Unix Time').
>
>For people to be forced to rely upon GNSS (Glonass, GPS, Galileo) for a time 
>signal is rather immoral when TV transmitters (and radio too, remember RDS) 
>pump out many megawatts of signal each day (globally).

Immoral?  That's a bit strong, innit?  You don't NEED to rely on satellites for
time signals.  There are many LF radio time signals, such as WWV, WWVB, WWVH,
CHU, MSF, DCF77, and others.  CDMA cell phone towers broadcast a time signal.




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