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Re: [Discuss-gnuradio] DBSRX tune delay

From: Sylvain Munaut
Subject: Re: [Discuss-gnuradio] DBSRX tune delay
Date: Tue, 08 Dec 2009 13:38:45 +0100
User-agent: Thunderbird (X11/20091028)

Vadim Uvin wrote:
> I have USRP+DBSRX. I'm trying to listen to uplink channel (MS->BTS) of
> GSM. To do that, I first need to be synced with the BS (i.e. listen to
> synchronization channel of BTS). Then I have to change the center
> frequency to uplink channel, but I need to know how long it takes before
> USRP gets stable or I can lost the synchronization. Unfortunately, I
> can't find what the tune delay of DBSRX is. Maybe someone knows?

You should use inband signalling, this way you have a 'sample' counter
and you know precisely 'where' you are in time.

Or you use two dbsrx, following both up & downlink ....


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