Guys,
Don't get confused with (a) recovering the transmitter's carrier frequency and (b) recovering the colour burst and/or data stream in a DVB-T signal for use as a "house frequency standard". They're not one of the same ! Most TV carrier frequencies here in Sydney, Aust (analogue & digital - we've got both running at the present time) are bog-standard xtals (possibly ovened). As noted by others, this crude approach isn't good enough for SFN's Attempting to recover any part of a RAW MPEG data stream from a "$49 digital STB" may be doomed to failure. Most STB of this ilk use a single jungle-chip with RF in and various flavours of video out. The data streams you need to access for any clock recovery strategy is unfortunately buried in silicon.... OT - Happy Thanksgiving holiday to all those in the USA & Canada. Kit VK2LL Sydney Christian Vogel wrote: > Hi Alan, > > 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. SFN requires synchronisation of frequency (10 MHz) and phase (PPS). DVB-T transmitters using SFN will broadcast pilot-tones. See ETSI EN 300 744, accessable through: http://www.dvb.org/technology/standards/ >>snip _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
