[time-nuts] OCXO and fluctuations after EFC adjustment
Bob kb8tq
kb8tq at n1k.org
Sun Apr 12 00:59:28 UTC 2020
Hi
> On Apr 11, 2020, at 8:10 PM, Richard (Rick) Karlquist <richard at 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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