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Re: [Discuss-gnuradio] measuring RSSI - N210 with RFX2400


From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] measuring RSSI - N210 with RFX2400
Date: Sat, 04 Jun 2011 15:58:46 -0400
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc14 Thunderbird/3.1.10

On 06/04/2011 02:04 PM, Josh Blum wrote:
There is an "rssi" sensor:
http://www.ettus.com/uhd_docs/manual/html/dboards.html#rfx-series

from the uhd api:
usrp->get_rx_sensor("rssi")

or in python w/ gr-uhd
usrp.get_dboard_sensor("rssi")


A disadvantage to the get_rx_sensor("rssi") approach is that only some of the daughter-boards have that (analog) function, and also, the RSSI is generally sensed at the bandwidth of the RF input to the down-converter chip, rather than at your final pre-demodulation bandwidth. Which can produce results that vary from mildly annoying to quite startling or even wildly wrong.

Which is why I always just compute the signal strength from the data stream at my final bandwidth.

--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org





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