Re: [Discuss-gnuradio] USRP and XCVR2450 Noise Figure

[Jeffrey Lambert]

Hello,

The noise figure will in large part depend upon the receiver front-end 
that is attached the USRP or in the daughter board that is used.  In 
that case that you would like to know the noise figure of the USRP 
without any RF front-end then the results may vary whether you are using 
a BasicRX board or one of the LFRX boards.  For a 50 Ohm system, either 
of these should yield accurate results.  Mainly, the noise figure of the 
USRP will be derived from the AD9862 digitizer.  Since this IC contains 
an amplifier, the noise figure will vary with the gain of the PGA.

I too am interested in measuring the noise figure of the USRP.  If you 
are unable to find anything, I will be able to supply measurement data 
within the next few weeks for a USRP device and BasicRX daughterboard.

~Jeffrey Lambert

On 7/15/2010 9:15 AM, address@hidden wrote:
> Hi,
>
> I was wondering if anyone found a datasheet of the USRP and/or XCVR2450
> which contain the Noise Figure of those devices, or at least of a
> combination of the two!?
>
> best and thanks a lot,
> Björn

--
~Jeffrey Lambert, K1VZX