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From: | John Ackermann N8UR |
Subject: | Re: [Discuss-gnuradio] Bins smaller than pixels. was: WX GUI FFT Sink Performance |
Date: | Tue, 28 May 2013 13:36:19 -0400 |
User-agent: | Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130509 Thunderbird/17.0.6 |
On 5/28/2013 1:28 PM, Simon IJskes wrote:
On 17-05-13 02:22, Marcus D. Leech wrote:Again, given the fact that your display geometry is likely less than 1280 wide, you'll simply lose information for FFTs larger than that.I one is looking for weak CW signals, in a waterfall, wouldn't a wide bin, make this signal invisible in among the noise? If more bins fit in one pixel, there could be a mode where the bin with the most power is displayed. If this is complete non-sense, how would you implement looking for faint cw carriers, in like EME applications?
Take a look at the "rosenfell" or "normal" detector used in spectrum analyzers -- I think it's a way to deal with this question. There's a good discussion in the Agilent spectrum analysis basics app note:
http://cp.literature.agilent.com/litweb/pdf/5952-0292.pdf John
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