I think this will be of some help: http://www.nist.gov/pml/div688/grp40/wwv_format.cfm
You do need both 100Hz and 1000Hz signals and they should also come at synchronized moments seems like. Michel On Feb 1, 11:07 am, Mitch <[email protected]> wrote: > Hi All, > > I posted this in the Heathkit clocks forum too. > > I have three GC-1000s and living in South Florida, I've never had one > work well. > I've tried all kinds of antennas over the last few years with my > original, > without much luck. I have not tried an outside antenna, it's not > realistic > around here. > > I decided to attempt to interface an Arduino so that I can connect a > GPS > receiver and at least have one of them working reliably. I realize > that this > changes the character of the GC-1000 to not much more than a display, > but that's > fine with me if I can have one work reliably. No permanent mods will > be made to > the GC-1000. > > The hardware connection was made by lifting pin 8 from each of the > 567s on the > tone board, connecting the traces to two digital output pins on the > Arduino. > > 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. > > 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. > > At this point I think I'm stuck. Has anyone done this, and can anyone > help? > Thanks in advance. Mitch -- 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.
