if ((samplecnt >= 7999) && (samplecnt <= 8001))

it needs to be changed to something like:

if ((samplecnt >= 7999) && (samplecnt <= 8003 ))

That was just enough to make my first RTCM work.  I've had a chance now to check a few more of my RTCMs on the bench this morning and the crystal frequencies are kind of all over.  The next one I had on the bench was 5.2Khz fast.  The above code was still not enough to fix it (as would be expected) so it looks like the quality control on whatever manufacturer that crystal is, isn't very good (or a low tolerance crystal is being used).  I am going to pursue crystal replacement to get a highly accurate, stable, on-frequency crystal in there as my first choice.  Changing the firmware 5 different times doesn't seem like the right answer.

Jim put that sanity check in there for a reason.  Working around it *may* allow the device to work, but to me, it seems getting the hardware operating the way it was supposed to originally is the better answer.  I will follow up with Micro-node and let you all know how it goes.

Thanks.

James

KI0KN