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

[Marcus D. Leech]

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