[HomeBrew] Re(2): Direct RF-Sampling ADCs - Breakthrough

[DavidE Benedict]

***
Thursday, July 28.2011

Ian, I am glad you have some interest in what I thought was a possible big
help to radio designers.

I know only a little, and deep radio subjects, like receiver design, are
way over my head. But it occurs to me that the mfr could be queried on the
points you raise...perhaps to the benefit of all.

So I went to the link in my original post
http://www.national.com/en/rf/rf_sampling_adc.html 
and raised those concerns with National without identifying you. I'll
report what they say.

David B
W7DBH
Oregon

Ed
>ucate and inform the whole mass of the people... 
>They are the only sure reliance for the preservation of our liberty.
>
>Risk comes from not knowing what you are doing. —Warren Buffet
> 
>
>>Thanks for posting this, David.
>>
>>It's not clear to me that 12 bits is sufficient for 'real' SDR (to me,
>>this
>>implies digitizing as close
>>to the antenna as you can get, probably with a preselector to remove
>>signals
>>that are way out of
>>band).
>>
>>For HF usage we need to be able to handle sub-microvolt wanted signals in
>>the presence of
>>out-of-band signals six orders of magnitude higher than this, and in-band
>>signals that aren't much
>>smaller in contest conditions. 12 bits doesn't have anywhere near enough
>>dynamic range.
>>
>>I may be confused and/or missing the point, hi.
>>
>>73, ian K3IMW
>
>
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