[Discuss-gnuradio] More sensitivity tests of the USRP2 + Basic_RX

Test setup:

o A signal generator producing -46dBm at 38.1MHz
o USRP2 + Basic_RX

o GRC flowgraph:
o An FFT filter, reducing the incoming 250KHz bandwidth to 5KHz
o A power detector:

(I**2 + Q**2)--->single-pole-iir-filter

o A strip-chart scope display

Using the scope display, I measured the detector output difference
between nothing connected (which on the BASIC_RX means that
the A/D is "seeing" the 50-ohm termination across the input-half of
the balun transformer), and my -46dBm signal connected.

That difference amounted to a 65dB difference in detected output power.
Doing the math, does that mean that a "naked"
USRP2 + Basic_RX is sensitive down to roughly -111dBm, or should I
factor in root(5KHz), which brings it up to -92dBm.

--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

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