Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum

[Marcus D. Leech]

Frank Brickle wrote:
>
>
> On Tue, Mar 10, 2009 at 11:10 AM, Marcus D. Leech <address@hidden
> <mailto:address@hidden>> wrote:
>  
>
>     OK, so I decided to use the averaging method, rather than the maximum
>     method.  It produces reasonably good looking plots:
>
>     http://www.science-radio-labs.com/files/spectral_example.ps
>
>
> True, not bad. One surprise, though -- what's that notch around 1420.5?
>
> It definitely has an "averaged" look to it -- much like what you'd
> expect from time smoothing and not frequency necessarily. One thing
> that low-level heuristic grass might give you is a feeling that the
> relatively flat segments are alive at least, sort of like comfort
> noise during vocoder silence. If that matters.
>
> Frank
>
> -- 
> For an omnipotent and omniscient being, God has made some really lousy
> earthly staffing decisions. -- John Cole
The Fc is 1420.4058e6Hz, and since it's a direct-conversion receiver,
there's always a little spectral artifact near DC.

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