Re: [Discuss-gnuradio] digital noise input

[Don Ward]

On Fri, Nov 17, 2006 at 07:13:05PM -0800, Oussama Sekkat wrote:
> I am still trying to measure the digital output noise (from the LFRX_A
> daughterboard).
[and later:]
> I fixed it now by making it a source instead. Thanks.
> My output reading from the logic analyzer is now the following constant 16 
> bit value:
> 0000 1111 1100 0011
> This seems to me a too high of a value since I shouldn't be receiving any 
> signal. On top of > that, none of the bits are toggling, which doesn't 
> make sense if it was just noise.
> Any ideas on what's going on here?

How is the input to your LFRX connected?  The response goes down to DC and 
will only be (near) zero with a 50-ohm (at DC) source resistance.  Does your 
output reading depend on the PGA setting?

-- Don Ward