It's strange but the only sampling rate that works is 4 MHz; Packets are not decoded when the sampling rate is set above this rate.
Thanks, Tom On Thu, Mar 17, 2016 at 7:33 PM, Martin Braun <martin.br...@ettus.com> wrote: > What's your sampling rate? The further you go towards the edge of your > Nyquist zone, the more the anti-aliasing filter might be kicking in. > > Cheers, > Martin > > On 03/17/2016 10:23 AM, tom x wrote: > > Hi, > > > > My setup is a USRP N210 receiving from a transmitter sending a few > > packets a second. (The packets are decoded with Bloessl's 802.15.4 PHY > > block if it matters) > > > > Let's say the transmitter is sending data on frequency f_t. > > > > I set the USRP to receive on f_t plus an offset f_o. > > The next block is a frequency xlating FIR filter centered at -f_o. > > This is intended to correct the offset. > > > > I made a slider block for f_o and allowed it to vary between 0 and 3MHz. > > I need an offset of a few MHz for my application. However, the number of > > packets received seems to drops as I increase f_o. I get almost no > > packets after f_o is increased over 0.5MHz. > > > > The overall purpose of this is to carve two channels out of the received > > bandwidth with two frequency xlating FIR filter blocks, with the USRP > > tuned between the channels and the filter blocks centered at offsets > > that put them on the channel peaks. As explained above, if the offset is > > too big, it stops working. Why do you think this is happening? > > > > Thanks, > > Tom > > > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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