[CQ-Contest] SDR Mythbusters - ADC Overload myths debunked...

[Jim Brown]

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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