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From: | Gilad Beeri (ApolloShield) |
Subject: | Re: [Discuss-gnuradio] dBm and dB Measurements |
Date: | Fri, 30 Jun 2017 10:43:37 +0000 |
Hello Everyone,
I am using HackRF One and running gr-scan spectrum monitoring software. I am
also utilizing vector signal generator and spectrum analyzer.
Can anyone please help me understand the following measurement results from
both spectrum analyzer (reference level: -20 dBm) and gr-scan?
Spectrum Analyzer: -25 dBm VSG at 2437 MHz -> Peak Power: -47.26 dBm (Almost
no loss since it is one foot cable directly connected to spectrum analyzer
from vector signal generator)
gr-scan: -25 dBm VSG at 2437 MHz -> Peak Power: -47.61 dB
Spectrum Analyzer: -30 dBm VSG at 2437 MHz -> Peak Power: -52.85 dBm (Again,
it is the same...Almost no loss)
gr-scan: -30 dBm VSG at 2437 MHz -> Peak Power: -51.37 dB
Spectrum Analyzer: -35 dBm VSG at 2437 MHz -> Peak Power: -58.22 dBm (Almost
no loss)
gr-scan: -35 dBm VSG at 2437 MHz -> Peak Power: -58.34 dB
Spectrum Analyzer: -40 dBm VSG at 2437 MHz -> Peak Power: -63.21 dBm
gr-scan: -40 dBm VSG at 2437 MHz -> Peak Power: -63.15 dB
Spectrum Analyzer: -45 dBm VSG at 2437 MHz -> Peak Power: -67.63 dBm
gr-scan: -45 dBm VSG at 2437 MHz -> Peak Power: -67.41 dB
I guess there is no relationship between SDR dB values and spectrum analyzer
dBm values but what I have noticed that SDR is linearly following VSG power
increments.
Thanks,
--
View this message in context: http://gnuradio.4.n7.nabble.com/dBm-and-dB-Measurements-tp64413.html
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