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

From: Nick Foster
Subject: Re: [Discuss-gnuradio] WBX and frequencies around 433 MHz?
Date: Mon, 5 Dec 2011 11:38:20 -0500

On Mon, Dec 5, 2011 at 10:50 AM, Patrik Eliardsson
<address@hidden> wrote:
> 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.

What does the FFT of the received data look like at 433MHz? 420MHz?


> 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
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