[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] WBX and frequencies around 433 MHz?
From: |
Patrik Eliardsson |
Subject: |
Re: [Discuss-gnuradio] WBX and frequencies around 433 MHz? |
Date: |
Tue, 6 Dec 2011 08:49:56 +0100 |
> > 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