26 Oct
2011
26 Oct
'11
6:01 p.m.
On Wed, Oct 26, 2011 at 08:52:14AM -0500, Charles Henry wrote:
This looks good to study--that analog board has great noise characteristics.
Yes. To get the full story you should also zoom in on the 0-500Hz range.
Noise density will rise in that range, and there will be mains frequency
harmonics leaking in.
Provided the noise density is flat in the audio range, the unweighted
S/N for 20 kHz bandwidth would be -(No + 43) dB, i.e. 114.8 dB for the
SDR Widget Lite Alpha2, which is quite good. For an A-weighted value
add 2.2 dB.
The best way to measure the actual noise level would be jnoisemeter.
Ciao,
--
FA