[time-nuts] Digital TV signals
SAIDJACK at aol.com
SAIDJACK at aol.com
Wed Apr 16 17:28:51 EDT 2008
Hi Ulrich,
interesting story. A bit of history from my side:
In about 1996 I lived in Stuttgart and we measured the Hs frequencies of the
German TV stations at the time. I used a Philips SAA7111 or similar Video
decoder's 27,0MHz output (which is line-locked to Hs) to measure the frequency.
SAT1, and others such as RTL etc were off, some by several ppm(!), still
within PAL standards, but totally offset from any type of accurate frequency
standard.
I was shocked how bad it was.
ZDF and other government channels were quite good at the time, and had very
little offset to one another.
bye,
Said
In a message dated 4/16/2008 09:13:36 Pacific Daylight Time,
df6jb at ulrich-bangert.de writes:
So, what I had measured was the rubidium's offset against NIST after
some years of free running operation. While the whole story was a
striking experience for me it also showed that there must have been a
formidable number of owners of TV based frequency standards that had
simply not seen how bad their standard really was.
Best regards
Ulrich Bangert
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