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

[Greg Troxel]

"Marcus D. Leech" <address@hidden> writes:

> 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.

I see your point and your logic, but this seems to be assuming too much.
What if you adjust your signal generator to -110 dBm?  That's a fairly
low value, but it should be easily acheivable on most RF signal
generators.

> 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.

If you're looking at CW, 5 KHz is huge, and probably as you bring down
the bandwidth you'll get the same output as long as you're in the
passband.

This is how ARRL does receiver tests; it's probably at least good to
understand how you're differing:

http://p1k.arrl.org/~ehare/testproc/testproc.pdf


You could probably convince them to run a set of tests on a USRP-based
radio, sort of a product review without a product and without really
doing the rest of the review.

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