[time-nuts] Low temperature coefficient capacitors for DMTD

[Bob Camp]

Hi

My understanding is that it was part of a several decades long multi-billion dollar Coast Guard program to enhance the long term reliability of the Loran-C transmitter chains .....

Bob


On Jan 25, 2010, at 5:47 PM, Poul-Henning Kamp wrote:

> In message <ECE7A93BD093E1439C20020FBE87C47FED2B80A552 at ALTPHYEMBEVSP20.RES.AD.J
> PL>, "Lux, Jim (337C)" writes:
> 
>> Seems that boutique item and time-nut might go together, if there
>> was an actual performance advantage.  Besides, think of the bragging
>> rights from some of this stuff.  It could be worse than audiophile
>> craziness: [...]
> 
> Thanks for pointing that little shop out.
> 
> Did you notice this in their whitepaper:
> 
> 	From 1960s to 1980s, Electronic Concepts used Peter Schweitzer
> 	(a Division of Kimberly Clark) manufactured film, the only
> 	United States supplier of material, by license agreement
> 	with Bayer. In 1984, Electronic Concepts acquired the Peter
> 	Schweitzer film division, terminating the license, allowing
> 	Bayer to market the film in the United States. For economic
> 	considerations, Electronic Concepts started manufacturing
> 	capacitors using a balance of Bayer and Electronic Concepts
> 	film.
> 
> Does that sound like a run-of-the-mill business decisions made by
> a small company which produces capacitors ?
> 
> No ?
> 
> Then how about this:
> 
> 	In 1990, the conclusion of a polycarbonate film capacitor
> 	paper[1] stated, "both the orientation and crystal structure
> 	of PC (polycarbonate) film affects its mechanical properties
> 	and electrical dissipation factor". The paper was a cooperative
> 	investigation by the Jet Propulsion Laboratory and Electronic
> 	Concepts' film manufacturing division,
> 
> Why would JPL study obscure production details of polycarbonate
> film capacitors in 1990, if they fell of the market six years earlier ?
> 
> Sounds fishy ?
> 
> Anybody know what this means ?
> 
> 	Electronic Concepts accumulated almost five hundred million
> 	hours of testing military grade Polycarbonate capacitors;
> 	and, currently meet established reliability failure rate
> 	level "R."
> 
> Have you connected the dots yet ?
> 
> A fair number of the in-stockpile nuclear weapon designs are qualified
> using polycarbonate capacitors and can't be retested, redesigned
> or requalified...
> 
> Poul-Henning
> 
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe    
> Never attribute to malice what can adequately be explained by incompetence.
> 
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