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List:       gnuradio-discuss
Subject:    Re: [Discuss-gnuradio] Locking USRP2 to external 10MHz reference in	the UHD/GRC universe
From:       Matt Ettus <matt () ettus ! com>
Date:       2010-08-27 0:03:09
Message-ID: 4C7700BD.1020501 () ettus ! com
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On 08/26/2010 07:40 AM, Johannes Wenzel wrote:
> Hi,
>
> I'm using a mimo (2x2) USRP2 system. Both of the receiver USRP2
> receive a PPS- and a Clock-Signal provided by one GPS card. In grc I
> use the uhd_mimo_source block and two file_sink to receive and save
> the data sent. After starting RX the USRP2 mimo system seems to lock
> to the reference clock and reset the timer on PPS. Is this true? Or
> do I have to configure the block to do so? If I test the data with
> correlation it fails, which seems to be an indicator that at least
> the reference clock is not locked on.
>
> Is the uhd_mimo_source block automatically locked to external
> reference clock if used or do I have to configure it?
>

What do you mean by correlation fails?

Matt


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