> > Hi, > > > > While I was testing the DQPSK-(de)modulation blocks in GRC. > I found a frequency region where the reception failed. I > started with the ISM-band (433 MHz) as the center frequency, > and the reception didn't work. After checking my code several > times I decided to change the center frequency to 2 GHz and > everything started to work. So I tried several other center > frequencies with successful outcome, for example 2 GHz, > 1.5GHz, 800MHz, 500MHz, 420MHz. If I tuned the frequency to > the 430-440 MHz region the reception fails. > > > > I've used 2 USRP2s with the WBX and connected them with a > cable and 20 dB attenuator. > > > > I have 4 different WBX cards and the result is the same for > each of them. > > > > Have someone encountered the same problem with frequencies > around 433 MHz? > > > > Br, > > Patrik > > > > > Well, there's a lot of amateur radio traffic in that > frequency range, which may be interfering.
I will keep that in mind. But I used a cable between the USRP2s, so I wouldn't expect any interference from other systems. > Also, there's a special frequency at 433.920MHz used for > garage door openers. Are you running > your USRP2 with the covers on or off? The covers are on. I will have a look at the received spectrum again, as Nick suggested. -Patrik _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
