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[TenTec] IF-DSP: More, less, or more or less? You choose. - A VHF/UHF p

To: <tentec@contesting.com>
Subject: [TenTec] IF-DSP: More, less, or more or less? You choose. - A VHF/UHF perspective
From: n9dg@yahoo.com (Duane Grotophorst)
Date: Thu, 29 Aug 2002 13:08:39 -0700 (PDT)
--- "Ten-Tec Inc. Amateur Radio Sales"
<sales@tentec.com> wrote:

> We're now bumping up against hardware
> not keeping up
> with the processing capabilities.

I have been wondering if this is where the state of
the digital based radio art is at today. I guess that
those A to D chip designer guys have some catching up
to do. 

> Here's a spec, that taken out of context is
> meaningless.  (Doug Smith
> provided this to me):  The dynamic range available
> for 64 bit DSP
> representation (a la the dual 32 bit SHARC DSP's in
> the Orion)
> is somewhere in the 400 dB range.

Hmmm, I guess this indirectly answers my curiosity
about how those dual SHARC DSP's are being applied.
 
> Summary:  HF receiver performance will evolve.

Hopefully this technology will be applied to VHF/UHF
applications as well. Arguably the dynamic range and
low noise design requirements are tougher on ?weak
signal? VHF/UHF than HF. After all the natural noise
floor is much less than on HF. Plus you are frequently
trying to dig out signals that are much less than -140
dBm right next to one of those line of sight legal
limit (into 15+ dB gain antenna aimed your way)
mutli-op stations on a mountain just 20 miles away. At
a minimum easy multi transverter interfacing to the HF
gear is called for.

Duane
N9DG


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