[time-nuts] IRIG-B Reader/Offset Generator??

bg at lysator.liu.se bg at lysator.liu.se
Thu Aug 31 16:20:15 EDT 2006


On Thu, August 31, 2006 16:10, Rob Kimberley said:
> I wonder if anyone can help me out here.
>
> Looking for an IRIG-B Reader/Generator that can read IRIG-B and Generate
> IRIG-B + 1 day. i.e. output is always exactly 1 day ahead of input.  Must
> be
> able to start at an input of 000:00:00:00 (DDD:HH:MM:SS).
>
> Have scouted round most of the usual suppliers, but no luck so far.

Two semi wild ideas...

There is a audio (sound card) IRIG-B refclock driver for NTP. Dr Mill has
also written a sound card IRIG-B generator. Sync a computer with the audio
driver or a conventional irig-B reader. Hack the software generator to
output the code 1 day ahead.

Take one IRIG-B reader to decode the incoming stream. Let the 1PPS output
from that first card be a 1PPS input to a GPS steered IRIG-B generator. Do
not connect the GPS recevier/antenna (Acutime or equivalent) to the card.
Instead figure out which messages the timing card listens to emulate those
messages with a day added. Feed the simulated messages to the GPS input
from a computer serial port.

A less fun one...



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