Re: [Discuss-gnuradio] usrp dbsrx to use in seti and radioastronomy

[Marcus Leech]

Iban Cardona wrote:

> Hi,
>  
> I'm looking to buy a rfspace sdr-14 to use with a icom r7100 for seti 
> and RA. But today I see in the Ettus home page that it have the DBSRX 
> for sell, if it is usable for seti and RA it is a nice candy :) 
> because putting two dbsrx boards is possible to listen two channels at 
> the same time for example.
>  
> I have some questions, what is the minimal tune step, the minimum 
> signal detectable, and the noise floor of the board? Somebody has test 
> the module to receive some l-band signals like inmarsat-a, gps, 
> noaa's, etc.. ?
>  
> Thanks a lot!
>  
> Iban
>  
>
>  
I've used the DBS_RX board, and was able to see GPS L1 with a 15dBg, 
0.7dBnf LNA in front of the DBS_RX.  I don't have
 hard numbers on performance.  I think the minimum step size is 10khz.  
The DBSRX board itself is probably quite noisy--
 most such things are, which is why you *have* to use an LNA or two in 
front if you're doing radio astronomy.