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From: Zen Cycle <funkmaster@hotmail.com>
Newsgroups: rec.bicycles.tech
Subject: Re: RE: Re: RE: Re: RE: Re: RE: Re: RE: Re: Fine Tuning Shifting
Date: Wed, 11 Sep 2024 16:57:13 -0400
Organization: A noiseless patient Spider
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On 9/11/2024 4:22 PM, cyclintom wrote:
> On Sat Aug 17 07:20:44 2024 zen cycle  wrote:
>> 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.
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