Re: [Discuss-gnuradio] Can't set center frequency of USRP2 w/DBSRX

[spaceyaeon]

Hello,

I am having a similar problem as mentioned by Moeller in his message. I have
made the required modifications to be USRP2 + DBSRX.  All I see is a noise
floor when I try usrp2_fft.py. I am inputting 2.165 GHz signal through RF
In. Is there something that I am doing wrong? Do I need external Ref clock?
How can I do the basic test of receiving the carrier signal and displaying
it ?

Any help to this issue will be highly appreciated.

Thank you in advance.
Amee


Moeller wrote:
> 
> 
> 
>>The system is kind of working, but usrp2_fft.py reports Failed (or Invalid
if there's a typo) for every frequency we enter regardless
> 
> Hello!
> 
> we have a similar problem with the USRP2 and DBSRX.
> The modifications are already done, from the instructions at
> http://gnuradio.org/redmine/wiki/gnuradio/USRP2DBSRXModification
> http://code.ettus.com/redmine/ettus/projects/public/wiki/U2binaries
> 
> The SMD-resistor was moved (contacts and value were checked).
> The Burn DBSRX EEPROM was programmed, togethers with the "Raw Ethernet"
> FPGA image (rel-20100603). This all went fine, no error messages.
> Later, the "Raw Ethernet, No WBX or XCVR" firmware was played back to the
> SD card.
> 
> Now, we can communicate with the USRP2, in usrp2_fft.py we see a spectrum,
> with some lines. But changing the frequency has no effect on the spectrum.
> There is no "failed" warning in the bands at 800 MHz. It seems to
> communicate.
> But we receive no signal in the expected frequency. Just always the same
> noise
> with some fixed lines, regardless of the frequency setting.
> 
> Any idea what could be wrong?
> 
> All other daughter-boards work fine, except the DBSRX.
> 
> Moeller
> 
> p.s.
> why do they sell USRP2-daughter-board-combinations at Ettus that are not
> compatible?
> There was no warning, that hardware-modifications were necessary.
> The marketing brochure says, that the DBSRX is USRP2-compatible.
> 
> 
> 
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> 
> 

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