[SI-LIST] : Recurrent Email? Was: What speed scope should I consider?

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From: Mark Randol (m.randol@motorola.com)
Date: Fri Nov 12 1999 - 12:13:12 PST


"Mark Randol (ryvw50)" wrote:
>
> Larry McMillan wrote:
> > They do. It's a 2GHz model called the TDS794. We have one and it gives
> > very satisfactory performance. By the way, the Tek 580D is exactly the
> > same as the 784 except that it has a black and white display instead of
> > color and it costs a whole lot less. We have that one too, and it is
> > also very good. Got rid of a couple of our 1GHz LeCroys when we got
> > these, and now only use our two remaining LeCroys when both Tek scopes
> > are already occupied. Tektronix doesn't make a black and white version
> > of the 2GHz 794 or else we probably would have gotten it instead too.
>
> OK, maybe I don't get it being a mostly analog type, but why is a
> 2GHz analog bandwidth with a 1-4GSa/s rate better than a 1GHz one
> with a 2-8GSa/s rate? Sure, according to Nyquist you could see
> up to 2GHz with a 4GSa/s rate, but if you're going to be able to
> see much, you need a sample rate about 5-10X the analog
> bandwidth.
<snip>

Whut da?? I think we had this discussion over a year ago, along
with my posting and it shows up in my emailbox today?
Strange... I wonder if the glitch is on my end, Ray's end, or
something else (user error)?

-- 
Mark Randol, RF Measurements Engineer
Motorola SPS, Inc.
M/S EL381
2100 E. Elliot Road
Tempe, AZ 85284
(480)413-8052 Voice
(480)413-3455 FAX
M.Randol@motorola.com

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