Re: [Discuss-gnuradio] WBX and frequencies around 433 MHz?

[Marcus D. Leech]

>
> 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