[time-nuts] Time/freq from digital TV
David I. Emery
die at dieconsulting.com
Sat Jun 13 22:08:18 EDT 2009
On Sat, Jun 13, 2009 at 09:59:50PM -0400, Glenn Little WB4UIV wrote:
> The digital transmitter could have a GPS based frequency reference.
> I am the CE for a local station (WCIV).
> We do not use any standard other than what is installed in the transmitter.
> I have not verified it, but, I think that the UHF transmitter
> frequency is controlled by an OCXO.
I'd bet a lot of current digital exciters use a digital
synthesizer locked to a reference rather than a special OCXO crystal cut
to a particular TV channel frequency. This COULD allow a 10 Mhz in lock to
a GPSDO, rubidium or better...
I found a couple of the Boston analog stations were very
accurately on frequency using my spectrum analyzer signal counter with a
10 MHz GPSDO reference... so some folks somewhere must bother to lock
Dave Emery N1PRE/AE, die at dieconsulting.com DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in
celebration of what could have been, but wasn't and is not to be now either."
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