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

From: Tim Pearce
Subject: Re: [Discuss-gnuradio] Clock Sync Problems + Timestamp question
Date: Tue, 20 Oct 2009 18:01:48 +0100

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?



Sorry I probably confused things by mentioning the BasicRX

DBSRX is the only receiver we have 2 of at the moment so I was testing with a 2 GHz Sine wave, tuning the USRP2 to 2GHz and setting decim to 50.

The problem was seen on both usrp2's after enabling the 10MHz ref lock.

Before enabling the ref lock the sine wave appeared on the oscilloscope as expected.

I tried one USRP2 with the BasicRX just to check the same problem was appearing -- a 25MHz and 150MHz signal were tested (same decim and tuning to the frequency the sig gen is generating on). Both frequencies looked correct on the scope sink until the program was run with the clock locked to the reference in. - the symptom was slightly different (appearing as a DC signal rather than noise) which is why I mentioned.



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