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From: | Marcus D. Leech |
Subject: | Re: Questions on the GNU WiFi GUI with the USRP B210 box |
Date: | Sat, 27 Jun 2020 17:20:28 -0400 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
On 06/27/2020 04:55 PM, Silvio Cardero
wrote:
ThanksGnu Radio doesn't give you numbers calibrated against powers or voltages seen at the antenna, only some approximation of dBFS in the digital domain. If you want that calibrated in "real world, as seen at the antenna" units, you'll need to undertake a calibration exercise over the multi-dimension parameter space of: o Gain setting o Frequency o Analog bandwidth setting o Sample rate o Probably master clock rate o Whether you're using TX/RX or RX2 port for RX Since Gnu Radio (and, by inference MatLab) do not *KNOW* anything about the analog behavior of the transceivers it's connected to, you cannot come to any conclusions about what the instantaneous samples *mean* in terms of real-world analog voltages other than that they're mostly linearly related, and that for a given situation, a larger sample magnitude means a larger output from the DAC (or, respectively from the ADC). |
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