USRP Noise Floor

GNU Radio
1

Dear All,

I would like to learn the noise floor of a receiver which uses USRP,
XCVR2450 and VERT2450.
Namely, when usrp_fft.py is run with no incoming signal present in an
indoor
environment, what is the expected noise level?
Thanks in advance.

Regards,
Pelin Yalcin
Research Assistant
Center for Wireless Communications and Signal Processing Research
(CWCSPR)
New Jersey Institute of Technology

2

N. Pelin Yalcin wrote:

Dear All,

I would like to learn the noise floor of a receiver which uses USRP,
XCVR2450 and VERT2450.
Namely, when usrp_fft.py is run with no incoming signal present in an
indoor environment, what is the expected noise level?
Thanks in advance.

The noise figure is between 6 and 10 dB

Matt

3

I’ve had quite a few problems which I think are caused by poor phase
noise
on the XCVR2450 – it’s an all in one chip with a local oscillator on
board
etc - the 2400 appears quite a bit better (20dB if I remember
correctly!)

The schematics are in an odd place for this board - I could only find a
link
under the USRP1 page
http://gnuradio.org/trac/attachment/wiki/USRP/xcvr2450_rev1.1.pdf

Tim

4

Yes, because the XCVR2450 is highly integrated, its phase noise will not
be as good as the RFX2400. I don’t think it is quite 20dB worse, but
maybe 10-15 dB.

Matt