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[time-freq] RefLock II behavior

John Ackermann N8UR jra at febo.com
Wed Jun 21 00:25:26 UTC 2006

This looks similar to, but is orders of magnitude larger than, what I 
saw when using the Reflock II to control a 10MHz TCXO from GPS.

We concluded what was happening there was that the Reflock D/A was 
dithering between two discrete steps, causing the noisy state for a 
while, then the loop would move for a while to a stable state where the 
voltage wasn't dithering, then it would drift off again.  Not sure if 
you're seeing a magnified version of the same thing.


Owen, Michael wrote:
> Dear friends,
> Thanks to Steve Bible, I got my brain un-stuck and figured out how to
> set the 0-ohm jumpers (I'll summarize everything in a couple of days
> when it's all finished and my shame has faded).
> For right now, I have a question.  RefLock plus my pretty good OCXO are
> trying to settle at 100 MHz but there are sharp spikes every few
> minutes.  Here's an image:
> The time span is about 40 minutes.  Even after 3+ hours, the spikes are
> still there (although more rarely).  Does anyone have an idea how to get
> rid of them?
> 73, W9IP
> ------
> Michael R. Owen, Ph.D.
> Senior System Engineer
> Sensis Corporation
> (315) 634-3066 
> ------------------------------------------------------------------------
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