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.
