Correction: the UTC offset is part of the *primary* data packet that is sent every second from the Thunderbolt, but as Tom pointed out, it has to receive the information from the satellite(s) first, which can take 12.5 minutes (Thunderbolt Users Guide, version 5, 2003, page A-56, paragraph Report Packet 0x8F-AB Primary Timing Packet) Until it has received the information, the UTC offset is represented as 0, which can certainly be confusing.
The "Leap Second Pending" bit is part of the *secondary* data packet sent by the Thunderbolt every second as well. The manual does not say how often the "leap second pending" information is sent from the birds. Since I rarely turn my Thunderbolts off, and I display GPS time by default, I had not noticed the delay after power up. On Tue, May 1, 2012 at 3:17 PM, <[email protected]> wrote: > From memory, the UTC offset is part of the Supplemental data packet that > is sent every second by default. > > Didier KO4BB > > Sent from my BlackBerry Wireless thingy while I do other things... > > -----Original Message----- > From: Hal Murray <[email protected]> > Sender: [email protected] > Date: Tue, 01 May 2012 11:41:22 > To: Discussion of precise time and frequency measurement< > [email protected]> > Reply-To: Discussion of precise time and frequency measurement > <[email protected]> > Subject: Re: [time-nuts] thunderbolt "no UTC offset" > > > [email protected] said: > > I just powered on again my trimble thunderbolt after some time without > > antenna. All alarms are green but the obvious leap second pending. BUT: I > > can't use UTC time as both tboltmon and lady heather display a "No UTC > > offset" message. I don't remember having seen this in the past. What's > wrong > > with the thunderbolt now? > > How long has it been on? > > The UTC offset comes from the satellites. I think it is only sent every > hour. > > -- > These are my opinions, not necessarily my employer's. I hate spam. > > > > > _______________________________________________ > 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.
