Hi, I don't know whether the ABC signal you are referring to is TV, AM, FM or DAB but, if it is digitally networked, it isn't uncommon for time signals to be out by a second or so. Before Christmas, here in Sheffield (UK), the digital clock on my bedside DAB radio was well over seven seconds slow but suddenly 'pulled-in' to about two or so. When I first got the radio, I rang the local manufacturer's 'Help Line' to be given the two-word answer "Network Delays".
Some of these will be unavoidable but I seem to remember reading that they are also something to do with synchronisation of, or preventing interference from, multiplexes in nearby areas. It would be nice if the offset were constant though but perhaps is set dynamically. First off I wondered if they couldn't have preset the local transmitter clock to take this into account but realised that it would then insert the 'pips' at the wrong place in the audio stream. Still, if they can put GPS disciplined clocks at mobile phone sites, they should be able to set the local time bytes to better than two seconds. If someone has more information on this I would like to hear it? A few years back you could email the BBC engineering department but now it's all out to contract and I've no idea who to ask. Cheers - Joe G3LLV Date: Sun, 3 Jan 2010 19:02:18 +1100 From: "Morris Odell" <[email protected]> Subject: Re: [time-nuts] ABC time signals in Tasmania/Australia wrong To: <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" They appear to be spot-on here in Melbourne. Morris Date: Sun, 3 Jan 2010 12:14:05 +1100 From: Jim Palfreyman <[email protected]> Subject: [time-nuts] ABC time signals in Tasmania/Australia wrong For the Down Under nuts, The ABC radio time signals in Hobart are one second out. Is it a national thing? Can others in the country check? I rang the ABC locally on xmas eve but it is still not fixed. Jim Palfreyman _______________________________________________ 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.
