[email protected] said: > 2) What is the 5 MHz crystal oscillator locked to? If it the L1 or L2 > carrier - cool, or the PRN code clock - okay, but if it is the 1 PPS - ugh. > Since the sync signal must go through the jumper cable, I suspect it is the > 1 PPS. Anyone know, and if it is the 1 PPS, is that as ugly as I believe?
All the GPS work is done in a small low-cost module, the type typical used in consumer gear with a firmware tweak to work in position hold mode. Generally, that gear is L1 only, and the only signals that come out of the module are a serial port and the PPS signal. Why do you think the PPS is "ugly"? It's generally derived from the crystal that drives the CPU on the module. It's normally within 1/2 cycle (10s of nano seconds) within the desired time. Some modules will tell you how far off it is - the sawtooth correction. -- These are my opinions. 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.
