On 4/27/2010 2:25 AM, Daniele Tincani wrote:
Hi Alberto,
I'm quite
familiar with digital signal processing (I work in the embedded SW
area for a big manufacturer of telecommunications equipments and
digital streams of several Gbit/s are common on our boards),
nevertheless I know that analog conditioning of signals (before they
become "numbers") is at least as important as the digital treatment,
unless you accept to sample meaningless information (noise) at the ADC
:-) Anyway I'm sure this is dealt with perfectly in SDR's so I think we
can stop here this discussion.
Thank you for
clarifications.
Cheers
D,
Hi Daniele,
I wasn't specifically addressing you in my past message, I was just
trying to explain what is behind some diffidence that often it is
possible to hear or to read
about the SDR technology. And the Softrocks are a mixed blessing...
from one side they helped a lot with their very low cost the diffusion
of the SDR concepts
among the ham community. But on the opposite side, their lackluster
performance generated in some the impression that SDR is a technology
still much behind
its classical analog counterpart, which isn't....
You are perfectly right when saying that the analog portion in front of
the digitizer is of utmost importance, to not have to deal with
meaningless numbers.
That's why the tendency is to bring the digitization stage as close as
possible to the antenna... and, at least for the HF bands, this goal is
almost reached with
the QuickSilver and the Perseus SDR....
73 Alberto I2PHD
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