[Lowfer] WSPR comparison at 474.2 kHz

[Garry]

I've been running WSPR-X v0.8 to decode 474.2 kHz WSPR transmissions for 
some time now. But I noticed that weak waterfall signals that seemed 
strong enough to decode often did not. So last night I simultaneously 
ran WSPR v2.0. WSPR-X results were uploaded for the call K3SIW and 
WSPR2.0 results were uploaded for the call K3SIW/1.

Both were driven by an eprobe up about 10' in the back yard to an 
externally clocked SDR=IQ and DELL3020 Win 7 64 bit PC. The resulting 
decodes were generally within 1 dB SNR of each other and a few tenths of 
a second in timing. However, as noticed before, WSPR2.0 picked up a 
number of SNR cases around -28 dB SNR and even less that WSPR-X failed 
to decode. On the other hand, WSPR-X only false decoded WH2WSX (this was 
in good company with a lot of other reporters) while WSPR2.0 had two 
egregious false decodes (IB8HFK and Q55KRL), as well as WG2XXO (which 
also has been false decoded by others).

Seems that the extra sensitivity of 2.0 comes at the expense of reduced 
credibility.

73, Garry, K3SIW, EN52ta, Elgin, IL