On 3/11/13 6:49 AM, James Peroulas wrote:
Date: Sun, 10 Mar 2013 17:37:13 -0700
From: gary <[email protected]>
To: [email protected]
Subject: Re: [time-nuts] frequency reference for portable operation
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
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.
GSM and LTE (and WCDMA and TD-SCDMA for that matter) are spec'd for 50 PPB
accuracy. However, these networks are 'often' synchronized to an external
reference which would presumably be GPS. This would give better long term
accuracy, but the short term accuracy would depend on the actual
implementation of the basestation.
JP
P.S. I'm the author of LTE-Cell-Scanner.
There might also be a problem getting a decent signal at some of the
locations (remote mountain tops for instance). For several years, we
did JPL Amateur Radio Club Field Day up on top of Mt Gleason, and it
was notorious for no cell coverage. (I suspect it's better today..
that was at least 6-7 years ago)
But a battery powered OCXO seems to be a "good enough" and self
contained as well.
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