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From: | John DuBois |
Subject: | [Discuss-gnuradio] usrp A/D scaling question |
Date: | Wed, 08 Jul 2009 11:54:41 -0400 |
User-agent: | Thunderbird 2.0.0.22 (X11/20090608) |
Using a cw signal generator, I tune for a maximum usrp output and then raise the usrp input up to about -45 dBm. As the input increases, I see rising output values (on the scope display) from just above zero to a maximum of about 16400.
The puzzle is this: if the usrp A/D converter is 12 bits for I and Q channels and I am doing a complex to magnitude conversion, why don't I see 4095*1.414 as the maximum output number?
The maximum output I do see seems like 14 bits, but without any 1.414 factor.
What am I missing ??
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