[Lowfer] SNR comparison between deep search and "regular" Opera32

[Garry Hess]

On Nov 30, 2013 before going out of town awhile I ran the regular Opera 
decoding software simultaneously with deep search Opera. This allowed 
gathering snr data from both decoders for stations WE2XEB and WD2XNS on 
136 kHz (dial frequency). I've seen indications that the deep search 
numbers were notably less than the regular numbers, for whatever reason. 
Based on 8 comparisons for WD2XNS and 4 comparisons for WE2XEB, I found 
the deep search snrs lower, but not by as much as I had suspected and 
the data had substantial variability (not expected). Both sources 
averaged about 5 dB lower for the deep search numbers. The spread even 
over my limited sample set was on the order of +/- 3 dB, but in every 
case the deep search snr was lower than the regular Opera snr.

Perhaps in the future other stations can be added to the comparison. 
Deep search regularly decodes VO1NA here, but the snrs have so far this 
season been below -40 dB, too low for regular decodes.
-- 
73, Garry, K3SIW, EN52ta, Elgin, IL