Kit,
On Mon, Nov 23, 2009 at 6:30 PM, Kit Scally <[email protected]> wrote: > 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. > _______________________________________________ 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.
