Hi Roee, are you changing the frequency on both the transmitter and receiver? Because: mixing anything to a higher frequency is exactly that, a multiplication with a sinusoid.
Best regards, Marcus On 13.11.2015 07:01, Roee Bar wrote: > Hello, > > I am experiencing some weird behaviour with USRP blocks. > > I have a PHY block that generates packets with "packet_len" tag. This > stream is the input to a USRP sink block (the transmitter). Between > packets, my PHY block does not produce anything, so the USRP assumes > zeros until a new packet arrives with “packet_len” tag (I guess this > is what we call 'burst mode'?). The USRP source (the receiver) > receives the signal from the USRP sink as expected (with zeros between > packets). > > The problem arises when I change the center frequency from zero to > something higher (I use LFTX/LFRX boards). Then, the received signal > envelop is corrupted like it's multiplied by some cosine (see > screenshot attached, all frames are supposed to have the same height). > When I don't use the packet_len feature of the USRP block or when my > PHY block produces packets continuously, the received signal is okay. > > Why does this happen? Is my methodology of not producing anything > between packets is the right approach? > > Thanks in advance, > Roee > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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