On Sun, 2010-06-13 at 08:12 -0700, Damien S. wrote: > Hi all, > I'm trying to use the external clock input of the usrp2 with WBX in receive > mode. Unfortunately after processing the recorded signal there is still a > clock drift despite the fact i'm using a GPS reference clock. So i suppose > that i'm making something wrong.
Can you specify how much offset you see? I presume that the transmitter is also using a precision timebase? > 1) I'm using a square 10 Mhz reference from a GPS receiver (Novatel OEM4) > which has a 300 mV peak-to-peak amplitude -> this amplitude is sufficient ? I'm not familiar with that unit, but 300mV should work. I've used a Trimble Thunderbolt and a Jackson Labs Fury GPSDO without issue. > 2) I activated the external clock by selecting the external SMA option in > the usrp2_source block in GRC. Could somebody confirm that is method works ? Yes, it works. I just tested the GRC source and sinks with a signal generator and my USRP2 definitely tracks the "External SMA" clock. --Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
