On 12/11/2018 01:49 PM, Mark Wagner via USRP-users wrote:
Hey all,
I calculated the theoretical noise floor for a signal with bandwidth 1
MHz being detected at an N310 (6.8dB noise figure) and found it to be
around -106 dBm, but then when I ran my N310 I was seeing the noise
floor closer to -120 dB. The plot (made from) GNUradio is labeled as
'Absolute dB' but I am unsure what this means. Is absolute dB supposed
to be dB compared to a Watt or does it mean something else?
-Mark
--
Mark Wagner
University of California San Diego
Electrical and Computer Engineering
Which tool are you using?
Without special provisions, these spectral plots produce a dB scale that
is referred to the maximum value "full scale". This is
hopefully-mostly-linearly
related to the power as seen at the antenna, but with an unknown
coefficient. In order to derive absolute power values at any given
measurement plane, you have to calibrate using a source of known power.
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