> I can send IRIG H001 frames to the pin that was connected to U402 from > the 100Hz > source, and the data light blinks appropriately. What goes to U403 > from the > 1000Hz source is unclear in the GC-1000 manual. I've tried sending P0 > and also > the reference marker separately, and together. Sending the reference > marker during the 1 second quiet period at the beginning of the frame > seems to be correct. The capture light does turn on, > but time is never displayed. I don't know how long it should take, but > it's been > left on for a couple hours.
You'll need to send the modified IRIG used by WWV (17 cycles/170ms for a binary 0, 47 cycles/470ms for a 1). You'll also need to include the position identifiers every ten minutes (77 cycles/770 ms). The GC-1000 firmware looks for two consecutive frames that differ by exactly one minute before accepting the data as valid. It requires three of these pairs in a row before it will update its time. > From the schematic it appears that the data coming from the 567s is > inverted, so > I've allowed for that in the sketch. I was sending the same frame > without > changing the time for testing purposes. Possibly that is a problem, > I'm not > sure, so I now have it send four frames each incremented by one > minute, but no change. Close, but I think you'll need six frames, each incremented by one minute. > At this point I think I'm stuck. Has anyone done this, and can anyone > help? I haven't done this, but reading the GC-1000 manual (Theory of Operation section) yielded the information I mentioned above. I downloaded a copy in order to do so. - John -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
