ATS 909 vs AR3030

The Sangean ATS 909 is not a bad receiver, actually, I believe for the priece, it is a very good receiver. But, how good is it?
To find out, I did the following test:

1. run the ATS 909 with the Octaplumb
2. run the AR3030 with the Octaplumb

At the same frequency, measuring SNR (using WSPR) of stations receivable via ground wave.

On 600m, that was the result:

2010-03-03 21:26	G4JNT	0.503884	-11		IO90iv		PA1GSJ		406
2010-03-03 21:22	PA3EGO	0.503927	+10		JO22mb		PA1GSJ		52
2010-03-03 21:14	G4JNT	0.503881	-22		IO90iv		PA1GSJ		406
2010-03-03 21:14	PA3EGO	0.503923	-1		JO22mb		PA1GSJ		52

It seems, the AR3030 has got a 11dB advantage in SNR over the ATS 909. In other words, the relatively inexpensive ATS 909 is just 11dB short (in SNR) to one of the world's finest receivers.