Oops. problem solved. I had to increase the LO offset in the transmitter (not the receiver)! *Facepalm*
Thanks for the support mleech wrote: > > On 07/04/12 10:12 AM, frankist wrote: >> Hi, >> >> I am using GNU Radio for 2 weeks. I always get in the receiver side a >> signal >> with a peak in the carrier frequency when I turn on the transmitter even >> if >> I send a signal made of zeros. You can see it in the picture >> http://old.nabble.com/file/p33648622/usrp_carrier_peak.png >> >> In spite of being handy to discover the frequency offset of my signal, it >> is >> influencing my results when I try to measure the power of the received >> signal. I thought this was the DC offset, but I read somewhere that USRP2 >> eliminates the DC Offset. >> >> So, do you know what it is and how to remove it? >> > This is LO leakage. What is you setup here--two USRPs with XCVR cards? > > Mixers always have some amount of LO leakage at the output port. > Depending on your signal bandwidth, > you can use an LO offset to move that leakage outside of your > applications passband, but there'll still be > leakage--just not at a place that matters to you. > > -- > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://old.nabble.com/USRP-inserts-a-peak-in-the-carrier-frequency-tp33648622p33648967.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
