On Saturday 25 September 2021 09:50:31 John Figie wrote: > Actually the US export regulation is 600 hz. I worked in servo drive > development. > Thanks for the update John.
In a roundabout way, that does seem to indicate that what Todd needs is going to be American made, accompanied by scary permit paperwork, and because of its limited use experience to fix common problems, not as dependable as we are used to. Among other things is the frozen technology. One of my sons /was/ working in a shop that repairs electronic stuff from nuclear power facilities. All of that tech is frozen at 1960ish tech levels, making it illegal to use a more modern, thousands of times more dependable semiconductor device to repair them. With all the environmental tests such repairs must pass, makes replacing a shorted 1n34 diode, which I could do for a few cents and my time, into a 10 to 50 thousand dollar job with 50% of that being the world wide search for an original part. You can't replace a a half watt rated 5 cent in 1962 carbon composition resistor with a 6 month lifetime, with a 10 cent metal film fireproof version rated at 2 watts that barring mechanical destruction, would still be in tolerance when our star goes nova in its death throes billions of years hence. All because its type approved stuff and that would cancel the type approval. All the bill payers involved are non-technical and will say it worked that way once, make it work that way again with original parts only. I first ran into that in dealing with the military in 1961, working for a contractor who had a contract to maintain the portal door cameras at the Titan missle sites wrapped around EAFB at the time. Complaint was the camera was just barely working, and there were no spares. So I went out and got it, brought it back to EAFB and found a germainium diode, used as a back porch clamp switch had about a 10/1 front to back ratio. A very poor choice for such duties so I replaced it with a similar but si diode that was at least a million times better device for the job. Best picture I'd seen out of any of those 3 cameras in the previous year. But somebody, processing the payment discovered the part wasn't original and decreed that only original parts could be used. The fact that the camera now worked better than new was of zero interest, so they had the parts crib in the MAMS building find an original part (that took several months) and I had to put it in when they finally got it. In the meantime of course, the air force had to delegate a crew of mp rated flaps to guard the portal door (it was a revolving door that was designed to withstand a 500 feet above 50 megaton blast, and was 2 or 3 flights of stairs underground, probably weighed 10,000 lbs), because the camera wasn't to be re-installed until it had the original part in it. All of which was assinine from my point of view. But at that time I didn't even have a 1st phone, which I fixed shortly afterwards, then saw the comm college in Norfolk NE, (Johnny Carsen's home town) was doing C.E.T. testing a few years later so I walked in the door, laid a $20 (the application fee) on the profs desk and blew his mind 45 minutes later when I handed in the 4 hour test. He had been teaching that class for about 3 years then, and none of his students had passed it. I wasn't exactly impressed with his teaching ability. Pretty good for a guy with an 8th grade education. I quit school and went to work fixing them new fangled things called tv's in the middle of my freshman in high school year. The year was 1948. And WOI-tv in Ames Ia had been on the air about a year. First tv station in Iowa. But by summer next year, I'll have been retired for 20 years so I'm getting rusty. And despite the fact that I have now outlived all 3 wives, and 3 of the children the first one gave me, I still think I've had a good ride for what will be 87 years on 10/04. [...] -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
