Not nearly as unbiased, not nearly correct, as it purports to be. The
Noise Power Ratio Test is especially problematic -- the level of the
test signal is not a constant, but is adjusted to depend on
characteristics of the radio being tested. Thus, SDRs with limited
dynamic range are tested at lower signal levels. The results cannot be
compared to other radios -- it's apples and oranges.
Truly objective engineers familiar with his work have blown huge holes
in it, and others have noted that he acts as a mouthpiece for ICOM.
I heard Adam speak and later had dinner with him a few months ago. Nice
guy, retired from the RF side of telco, but either biased or sees the
world through blinders.
73, Jim K9YC
On Fri,11/6/2015 1:30 PM, Marijan Miletic wrote:
http://www.ab4oj.com/test/main.html#NPR gives unbiased account of the
behaviour of 16-bit ADC under strong signals! There is only one input to
ADC IC and even a single strong signal close to overflow threshold causes
significant degradation of performance. SDR DDC is the best HF radio in the
rest of all cases which are statistically important. And it should be much
cheaper than analog solutions packed with crystal filters. KX3 is good
example, IC-7300 is coming!
73 de Mario, S56A, N1YU, MSc EE retired
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