Don't know the answer to your 1PPS question. I can tell you that the GPS has to output the proper NMEA sentences in addition to the 1PPS in order for the RTCM to GPS lock. Are you getting NMEA strings from that unit?

On Sun, Jul 3, 2016 at 9:52 PM, Joe Moskalski <kc2irv@gmail.com> wrote:
OK, I am currently trying to get my GPS unit running with my RTCM. I am using a QRP Labs QLG1 at the moment for testing which does output a 5v 1PPS. The pulse from the QLG1 is 100ms long. I haven't been able to get the RTCM to achieve a GPS lock so my question happens to be what are the parameters besides the voltage level that need to be met for the RTCM for a valid 1 PPS input to it? I haven't been able to find this information online anywhere.

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Tim