Re: [Discuss-gnuradio] noise figure of XCVR2450

[Per Zetterberg]

I spotted in the data-sheet that to get a noise figure of 4dB a voltage
gain of 50dB is needed. 

My experience has been that a voltage gain above 20dB makes the receiver
go haywire. However, I may need to review this assumption.

BR/
Per


On Tue, 2010-10-19 at 20:14 +0200, Per Zetterberg wrote:
> Hi List,
> 
> I have previously claimed on this list that I have measured a noise
> figure of some 4dB on the XCVR2450. However, I probably made the
> following mistake: I used a CW of 2.4GHz as signal. However,there is
> spurious at 2.4GHz which I mistook for being my desired signal. The
> signal generator and the USRP2 was locked so there was just a single
> peak.
> 
> When I measured today I got a noise figure around 25dB. I wonder if it
> can be noise from the transmitter chain which is leaking into the
> receiver......
> 
> BR/
> Per 
> 
> 
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