Clock from phone

Sylvain Munaut 246tnt at gmail.com
Tue Jul 3 11:44:01 UTC 2012


> In some past post of the ML, I've read that someone was trying to get
> the GSM 10MHz clock reference from the motorola phones.
> This aimed at feeding usrp with a stable reference, if I'm not wrong.
> Anything new this side? This would be extremely useful if GPS signal
> can't be got but GSM cell can.

1) It's not 10 MHz but  26 MHz
2) Yes it works, but you can't feed the USRP directly, you need to
multiply it by 2 (using a PLL chip) to get 52 MHz for the USRP.

Cheers,

    Sylvain




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