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[time-freq] RefLock II behavior

Robert McGwier rwmcgwier at comcast.net
Wed Jun 21 01:48:29 UTC 2006


Could you provide a little more description of your set up?  What is 
your reference,  what is the tuning range on your VCO in frequency and 

 I can lock my oscillators using 1pps GPS or 10 MHz rubidium sing 
modified Reflock I and it will NEVER be that far off.  What you are see 
is 0.15 ppm.  That is really messed up.   You should be seeing one part 
in 10^10 at least from GPS (say).  My PTS-160 synthesizer locked to this 
source is extremely stable.


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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AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
Laziness is the number one inspiration for ingenuity.  Guilty as charged!

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