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Re: [Discuss-gnuradio] Clock Sync Problems + Timestamp question

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] Clock Sync Problems + Timestamp question
Date: Tue, 20 Oct 2009 09:44:53 -0700
User-agent: Thunderbird (X11/20090825)

Tim Pearce wrote:

I've been trying to get two USRP2's with their clocks both synced to a 10MHz reference (for now the same reference from the back of some test equipment) - to do this I'm using the following code:


As a quick test I then connected each usrp2 to a complex oscilloscope (i.e scopesink2.scope_sink_c)

This sort of works -- checking on the test clock pins on each USRP2 the 100MHz clocks are locked.

Unfortunately putting in a sine wave from a lab sig gen garbage is seen -- a constant DC signal on the BasicRX and what looks like modulated noise on the DBSRX (testing at different frequencies on both boards) -- the signal looks as expected if the config_mimo line is commented (and the usrp2's restarted).

Am I missing something obvious?

There is no frequency which can be received by both the BasicRX and the DBSRX. What frequency are you putting in? What frequency are you telling the USRP2s to tune to?


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