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 signals. -- Dave Emery N1PRE/AE, d...@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." _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.