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From: Zen Cycle <funkmaster@hotmail.com>
Newsgroups: rec.bicycles.tech
Subject: Re: RE: Re: RE: Re: RE: Re: Fine Tuning Shifting
Date: Fri, 16 Aug 2024 13:51:44 -0400
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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