Re: [Discuss-gnuradio] WBX Low Frequency Limit

[Josh Blum]

On 10/30/2010 04:47 PM, Eric Cottrell wrote:
> Hello,
>
> I just got my WBX board and it works great in my USRP2.  If it has 30 MHz BW 
> then I can try foolish stuff like decoding all VHF ACARS frequencies with 
> parallel decoders.
>
> When I do a USRP2 Probe the minimum Frequency is higher than advertised.
>
> Freq Range (min, max):
>         68750000.0 Hz
>         2200000000.0 Hz

Thats the limitations on the daughter-board LO. In combination with the 
FPGA DSP, the overall chain you can tune you down to 68.75MHz - BW/2 + 
host_rate/2, where BW is 40MHz: 
http://www.ettus.com/uhd_docs/manual/html/dboards.html#wbx-series

You can tune lower depending upon how much of your baseband spectrum 
that you are willing to tolerate outside of the passband of the WBX.

-Josh