On 6/14/2013 3:54 PM, Gullik Webjörn wrote:
> Why not one with a tuning input while we are at it?
You can get one like this for $2.18:
http://www.abracon.com/Oscillators/ASVTX-09.pdf
This can be pulled about 8 Hz. Which seems to be less than the potential
error due to aging, etc.
It gets more expensive after that.
Rather than pull the oscillator, we could offset our tuning, through
software, to account for the error of the onboard timing source relative
to GPS or to the frequency of the repeater or node. For coarse
resolution we can do this through input to the frequency synthesizer,
and for fine resolution we can do it in the DSP domain by adding an
offset to our baseband frequency.
If the node or repeater themselves have a more precise timing source
than mobiles, we can measure their frequency and use it to calculate our
own offset.
Thanks
Bruce
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