); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Richard,
Ah, I see now. Sorry. You are adding 120 TIC values together, dividing by 120 to get one mean TI value. You are also, independently, adding 120 sawtooth corrections together and dividing by 120 to get one mean correction value. Then, every two minutes, you add these two numbers and call it your OCXO-GPS phase and derive your DAC adjustment from that. I understand now. Mathematically your 120-batch scheme is identical to sawtooth correcting every 1pps live every second and averaging for 2 minutes. /tvb ----- Original Message ----- From: "Richard H McCorkle" <[EMAIL PROTECTED]> Tom, The GPS 1ns sawtooth corrections are accumulated in a 16F688 during the 120 second sample period with care that they match the same 120 1-second 10ns resolution phase samples collected. The accumulated sawtooth correction is read at the end of the sample period before the sawtooth correction for the next sample is sent by the GPS, scaled to match the accumulated phase count resolution and added to the phase count before the value is sent to the filter. This simplifies the design and has the same effect as adding a scaled sawtooth correction matching the counter resolution from each sample once per second. I do indeed make sure both numbers cover the same samples and have the same LSB resolution before adding so the results are valid. Richard _______________________________________________ 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.
