[USRP-users] N210 DDC gain
Marcus D. Leech
mleech at ripnet.com
Wed Sep 12 10:58:45 EDT 2012
> On 12/09/12 10:04, Josh Blum wrote:
> Great, thanks very much! I can confirm that, with the patch, I now see
> a sensitivity of 54500 counts/V with 6 dB gain enabled. As expected,
> this is twice what I saw before +/- measurement error.
> It still seems to be ~1.6 dB short of what I'd expect though. I guess
> maybe losses in the analogue circuitry in the Basic RX board might
> account for ~0.5 dB, but I'm not sure about the rest. I wonder if this
> sort of result is typical of real-world measurements?
I'll observe that if you're relying on a particular mapping of volts-in
to bits-out, then you're thinking digitally, and you need to stop it :-)
The main thing to worry about is whether things are largely linear.
Does a doubling in input voltage result in doubling the binary
Shirleys Bay Radio Astronomy Consortium
More information about the USRP-users