[time-nuts] frequency reference for portable operation

gary lists at lazygranch.com
Sun Mar 10 20:37:13 EDT 2013

I haven't researched this yet, but the SDR crowd is using GSM and LTE 
for tuning their sample clocks.

> https://github.com/steve-m/kalibrate-rtl
> https://github.com/Evrytania/LTE-Cell-Scanner

I have no idea what kind of accuracy you can get from a tower.

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