Taka,
it was possible, to do without computer, although the computer is a very
big help particularly for routine works, but it is possible not just
trouble shoot but design, very complicated circuits to, and there are
out there areas where computers still do not help today, Bob Peasa even
cached the computer, that it is lied to him, -- look here:
https://www.autodesk.com/products/eagle/blog/whats-all-this-bob-pease-stuff-anyhow/
-- but it is fun, it is still fun I am doing it for the last 60 years. I
just for that OCXO thema, I cleaned up the output of the DDS with out
VCO, but the principle is usable for any spectrum cleaning, I filed for
patent thus could talk about it, but it would not fit into the tread.
Engineering or as we spell it in German Ingenieur -ing, since the
Franco-German word is derived from ingenuity, not from the
engine.....And yes over there we figured out how to make the "thinking
machine", but we still using our own head to think.
73
KJ6UHN ex DL6QF
On 4/11/2020 7:05 PM, Taka Kamiya via time-nuts wrote:
I'm STILL reading this, with interest.
I want to know the method of fault discovery, thought process that ensued,
analysis conducted, testing process, and eventual root cause analysis. We rely
too much on automated processes and computers. I want to know how engineers
did more with less. Before they are forever lost, we got to document it, or
better yet, pass it on to newcomers.
I care more about how it was done before, not how it can be done better with
this or that million dollar tool.
---------------------------------------
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
On Saturday, April 11, 2020, 8:59:32 PM EDT, Bob kb8tq <kb...@n1k.org>
wrote:
Hi
On Apr 11, 2020, at 8:10 PM, Richard (Rick) Karlquist <rich...@karlquist.com>
wrote:
On 4/11/2020 2:25 PM, Bob kb8tq wrote:
Hi
Would you *really* want to read a book about how from August of 1986 to
January of 1993 AVX NPO’s had some sort of issue ( not that the issue is
clearly known, just that they are flakey) and that by 1994 the parts with
values below 220 pf in 0805 seemed to be fixed?
Again, the task was never to *fix* a component, simply to sort out the parts
that worked from the parts you didn’t want to use. The only feedback to the
manufacturer was via the (lack of) purchase orders.
Somehow I doubt anybody would make it past the first page ….
Bob
Back when before HP broke up into pieces, capacitor vendors considered
it a computer company and assumed that all capacitor orders were for
"computer grade" capacitors. This envisioned huge motherboards with
thousands of bypass capacitors. Like monitor specs where it is OK
for so many pixels to be bad, as long as 99% of the capacitors were
good ... ship them. As long as the average leakage current met some
spec, it didn't matter if a few of them were very leaky. The current
wouldn't be noticed. Tempco and dissipation factor didn't matter.
We did actually give the manufacturer feedback, but it was not accepted
because we as an instrument division were not in their target market.
They didn't support repurposing. It didn't matter than we were owned
by HP; we were using them for the wrong end use. It's like those
disclaimers that say "We do not authorize for the life support
market" etc.
Some vendors flat out would not sell to our division although they
were fine with the computer divisions.
By now, few people besides Bob are still reading this. :-)
Rick N6RK
Indeed over the years, our experience was that feedback on components was
at best unwelcome and at worst a major waste of everybody’s time. Lots of
“dialog” and very little benefit. Unless you are a precision crystal company,
oscillator companies are *not* a big customer for any component outfit ….
Bob
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