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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] measuring RSSI - N210 with RFX2400 |
Date: | Sat, 04 Jun 2011 16:26:35 -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 03:58 PM, Marcus D. Leech wrote:
In the case of the RFX2400, the RSSI detector output is operating at the pre-ADC bandwidth, rather than the input RF bandwidth. But my comment about the results varying from "mildly annoying" to "wildly wrong" still stand :-)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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