Re: [Discuss-gnuradio] Maximum value of samples

[Josh Blum]

Sebastiaan Heunis wrote:
> Hi
>
> Does anyone have an idea as to what the maximum value of a sample when
> read in matlab is?  I've got a BasicRx board and I'm injecting a 10dBm
> signal into RX-A.  Using max(abs(sig)) in matlab results in
> 8.6458e+03.  Is this what I should get, or should the maximum reading
> be higher?

USRP values are signed 16 bit values, so +/- 32768 range.

> Also, can someone quickly tell me about the two inputs on the BasicRx
> board.  Are they two different channels for sampling two different
> signals?  If so, how do I get access to both in a Gnuradio app?

They are 2 different antennas for 2 different signals. Or both antennas 
can be used in combination for a complex IQ signal.

For usrp_fft.py (side A):

-R A:0 uses the first antenna
-R A:1 uses the second
-R A:2 uses both antennas (IQ)

-Josh

> Thank you in advance.
>
> Sebastiaan