On 06/04/2011 03:58 PM, Marcus D. Leech wrote:
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.
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 :-)
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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