|From:||Marcus D. Leech|
|Subject:||Re: [Discuss-gnuradio] Measure the power using USRP|
|Date:||Mon, 07 Dec 2015 22:38:08 -0500|
|User-agent:||Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0|
On 12/07/2015 10:25 PM, w xd wrote:
I can't tell you that, because there's the whole bit about:
The numbers you get out of the end of a Gnu Radio are (largely) linearly-proportional to the power as seen at the antenna inputs.
The purpose of using an external calibration source is to determine what the proportionality constants are for each of your
configurations of settings of frequency/bandwidth/gain/sample-rate.
The FFTs in Gnu Radio necessarily can only show dB relative to full-scale. Gnu Radio has no way of knowing what those actually
correspond to in terms of power as seen at the antenna terminals.
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