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Re: [Discuss-gnuradio] Maximum value of samples

From: Josh Blum
Subject: Re: [Discuss-gnuradio] Maximum value of samples
Date: Fri, 27 Feb 2009 13:56:47 -0800
User-agent: Thunderbird (X11/20090105)

Sebastiaan Heunis wrote:

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)


Thank you in advance.


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