> > 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.
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? -- 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
