Hi Alan,
I cant remember the detail now but my converstaion with a BBC engineer at
the NPL meeting a few years back suggested along the lines of "yes there
would be a stable frequency available on a digital TV signal but no it would
not be related (tracable) to any given standard because it didnt need to
be."
at least here in Germany the digital TV transmissions (DVB-T) are using
(in some areas) Single Frequency Networks[1]. I live near one of the
transmitters
and when I visited the facility, they had Meinberg GPS receivers in the
racks housing the TV signal generators.
Speaking of alternate sources: Has any time-nut considered using the ISDN
telephone network [2]?
Chris
[1] http://en.wikipedia.org/wiki/Single-frequency_network
[2] http://openbsc.gnumonks.org/trac/wiki/isdnsync
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