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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!3.eu.feeder.erje.net!feeder.erje.net!weretis.net!feeder8.news.weretis.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: zen cycle Newsgroups: rec.bicycles.tech Subject: Re: RE: Re: RE: Re: RE: Re: RE: Re: Fine Tuning Shifting Date: Sat, 17 Aug 2024 07:20:44 -0400 Organization: A noiseless patient Spider Lines: 173 Message-ID: References: <18yoO.17738$iptd.15227@fx36.iad> <%TrvO.77681$WT8.8844@fx45.iad> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Sat, 17 Aug 2024 13:20:45 +0200 (CEST) Injection-Info: dont-email.me; posting-host="194a004a06a40209b036dd2d2c621107"; logging-data="1982437"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18kQHA94OYagXMqoqVWhP/pwg2RFNGFgsA=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:gP/Yc/C9kT76PoWAYDLL+VUpHO8= Content-Language: en-US In-Reply-To: Bytes: 9179 On 8/16/2024 6:28 PM, cyclintom wrote: > On Fri Aug 16 13:51:44 2024 Zen Cycle wrote: >> On 8/15/2024 4:28 PM, cyclintom wrote: >>> On Thu Aug 15 14:58:46 2024 Zen Cycle wrote: >>>> On 8/15/2024 2:35 PM, cyclintom wrote: >>>>> On Thu Aug 15 13:41:38 2024 Zen Cycle wrote: >>>>>> On 8/15/2024 1:08 PM, cyclintom wrote: >>>>>>> On Wed Aug 14 19:22:06 2024 zen cycle wrote: >>>>>>>>> On 8/14/2024 3:35 PM, cyclintom wrote: >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Flunky just talks ahbout crap that he doesn't know about. Notice how >>>>>>>>>> he could not answer how you measure the length of a wire >>>>>>>>>> electronically? That's because he personally doesn't know how to use >>>>>>>>>> an oscilloscope. Which comes as no >>>>>>>> >>>>>>>> Or, It could be because Jeff answered it as well as I could so I didn't >>>>>>>> feel it was worth commenting, but since you insist, here's how you test >>>>>>>> cable length with _out_ using dedicated TDR equipment: >>>>>>>> >>>>>>>> - Connect a pulse generator, an oscilloscope, and the cable under test >>>>>>>> together with a T connector (Typically BNC, but adaptors may be required >>>>>>>> depending on the equipment. >>>>>>>> - set up a pulse generator to single pulse, starting with a 1 nS width, >>>>>>>> 5 V P-P. >>>>>>>> - Set up the scope to trigger on the single pulse from the generator, >>>>>>>> with the pulse from the generator being displayed at the extreme left of >>>>>>>> the display. >>>>>>>> - Adjust the time base of the oscilloscope until the reflected pulse >>>>>>>> appears on the right side of the display while manually initiating the >>>>>>>> pulse on the generator.* >>>>>>>> - Longer cable lengths may make the returned pulse not quite >>>>>>>> discernible. When the trigger pulse is no longer visible, increase the >>>>>>>> pulse width until it is visible, then begin adjusting the time base >>>>>>>> again until the reflected pules is visible (It may also be necessary to >>>>>>>> increase the pulse amplitude). >>>>>>>> - Once the reflected pulse is visible, measure the distance between the >>>>>>>> trigger pulse and the reflected pulse on the scope as time delay (Hence >>>>>>>> the term Time Domain Reflectometry). >>>>>>>> - PLug this delay into the propagation delay value for the cable under >>>>>>>> test, and do the math. >>>>>>>> >>>>>>>> * setting up the generator to a repetitive pulse could prove problematic >>>>>>>> in that the trigger pulse period my be shorter than the propagation >>>>>>>> delay of the cable under test giving a confusing display. A competent >>>>>>>> technician could manage it, but given the bizarre and completely >>>>>>>> non-nonsensical method you described, it's well beyond your comprehension. >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> I particularly liked the part about "BNC" because as we all know the connector type is important >>>>>> >>>>>> It can be, depending on the application. When would you need an N-type? >>>>>> or an F-type? Be specific. >>>>>> >>>>>>> Because you don't know how to use an oscilloscope you can pretend that anyone wouldn't use repetitive pulses >>>>>> >>>>>> Pay attention sparky, I didn't write anyone "wouldn't use repetitive >>>>>> pulses". I wrote "a repetitive pulse could prove problematic >>>>>> >> in that the trigger pulse period my be shorter than the propagation >>>>>> >> delay of the cable under test". In a manual set-up they wouldn't >>>>>> unless they already had an idea of how long the cable under test was. A >>>>>> repetitive pulse isn't require in any case. Is this why you were never >>>>>> able to hold a job for more than a year? >>>>>> >>>>>>> or that the actual pulse with (1 ns?) is important. >>>>>> >>>>>> I didn't say it was. I selected 1 nS as a matter of convenience. For >>>>>> extremely long cables a 1 uS width is more advisable. The important >>>>>> point is to have the pulse narrow enough such that the reflection isn't >>>>>> obscured by the high level of the pulse. >>>>>> >>>>>>> It is no surprise that you never got a real job. >>>>>> >>>>>> Says the guy who never had a job that lasted more than a year. Meanwhile >>>>>> my resume includes ten years at HP/Agilent, ten years at Schneider >>>>>> Electric, and ten years at my current position. >>>>>> >>>>>> Still wanna play, sparky? >>>>>> >>>>>> -- >>>>>> Add xx to reply >>>>>> >>>>> At least you know that "sparky" is a compliment to a real engineer. >>>> >>>> no, it isn't, it's the name I give to a dog. In the 40 years I've been >>>> in this industry I've never heard an engineer referred to as 'sparky' >>>> except for a newbie hire who mis-wired a power supply and and blew up a >>>> 22000 uF 50V capacitor. It wasn't intended as a compliment. >>>> >>>>> Diablo Research followed me around buying up all of the companies I developed products for until they got so rich they hired me full time. >>>> >>>> Cool story bro. too bad it's bullshit. >>>> >>>>> That you think that R&D shyould be a permanent job at a single company shows how little you know about engineering. >>>> >>>> And where did I ever write that? I wrote that moving jobs every year is >>>> a big red flag to an employer. Besides that, you're the one that wrote >>>> "NO ONE EVER LEAVES HEWLETT-PACKARD!!!!!!". >>>> >>>> If none of the engineers at HP ever left, I guess that means HP wasn't >>>> really any good at anything, right sparky? Gawd you're an idiot. >>>> >>>>> If you had a single thought in your head it would get lost in that vast void. >>>> >>>> Still waiting on the PWM cable testing reference, and here's a little >>>> tidbit for you: >>>> >>>> Remember when you said TDR isn't used for fiber optic testing, and that >>>> 'light lines' is a commonly used term for fiber optic telecom cables? >>>> This website discusses Optical TDR techniques, and at no point uses the >>>> term "light lines" or PWM. >>>> >>>> https://www.flukenetworks.com/expertise/learn-about/otdr >>>> >>>> >>>> oh, and still waiting for that call from your lawyer for your libel >>>> suit, you drunk-ass bitch. >>>> >>>> -- >>>> Add xx to reply >>>> >>> >>> >>> >>> >>> More proof that you're not an engineer. >> >> No one I've ever worked with in my 40+ years in this industry has ever >> been called 'sparky' except for the aforementioned intern. Your inane >> claim is about a valid as claiming I'm not an engineer because I don't >> call fiber optics light lines. >> >> It was also used to refer to Radio operators and Liebermann could >> verify that if he wasn't more interested in protecting your intelgrity >> from your own comments. >> >> IF you were called sparky by anyone other than me, it was equivalent to >> some calling someone who just wrecked their car 'crash', or someone who >> just broke their leg 'skip'. It's not a term of endearment. >> >> -- >> Add xx to reply >> > > > > You must feel really bad comapring my net worth to yourself. No, I actually feel pretty good about it. > All you do is bitch and complain. HAHAHAHAHAHAAHHH!!!!!!! yeah, _I'm_ the one that does nothing but bitch and complain. HAHAHA!!!! > You never worked at any real electronics work Funny, my day-to-day activities (indeed my entire career) tell a very different story. > and cry that you don't know terminology so it CAN'T be true. I don't dry about such things tommy. I do what any responsible professional does: I do some research into the issue, then form an opinion. You might want to try the former some time, it'll be a lot less embarrassing for you. > What a joke. the story of your life.