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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] Measuring RSSI on USRPN200 |
Date: | Sun, 23 Oct 2011 09:35:39 -0400 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10 |
On 22/10/11 10:56 PM, Bonee Soibam wrote:
Hi Marcus ,My suspicion, having not looked at the code, is that the magnitude of the signals arriving at the "amp" block in that flow-graph are already sufficiently larger than "1", that you're seeing clipping somewhere in the chain. You *could* read the RX-side aux_adc, but it would give you mis-leading results, since the power-detector is showing you the power across the entire post-mixer bandwidth. It really, really is better to calculate the RSSI from the incoming data, and since you'd have to modify your application anyway to read the aux_adc, you might as well add a couple of blocks to calculate received power properly. Also, not all cards *have* an RSSI detector available in hardware, so assuming that they do is non-portable to other types of cards. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org |
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