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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 14:07:13 -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 01:52 PM, Kresimir Dabcevic wrote:

Hi list!

Is it possible to measure RSSI on RFX2400 with N210 motherboard (UHD drivers)?
>From the archives, it seems that read_rssi() is defined only for XCVR2450,
and read_aux_adc(side,0) described on http://gnuradio.org/redmine/wiki/1/UsrpFAQRSSI
cannot be called (or I'm calling it wrong).

Thank you.

Regards,
Kresimir Dabcevic


Only a few of the motherboards have an analog RSSI on the analog receiver chips, and then exposed through one of the low-speed
  ADCs.

A better way is to take your signal stream and compute:


     10*LOG10(DECIMATE(SINGLE_POLE_IIR_FILTER(COMPLEX_TO_MAG**2(SIGNAL))))

This is entirely independent of which daughterboard you have present, and might also be somewhat more accurate, and less prone to
  drift.








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