Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > sci.physics > #680570 > unrolled thread

Coaxial cable calculation

Back to article view | Back to sci.physics

Contents

  Coaxial cable calculation Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au> - 2018-04-10 16:42 +1000
    Re: Coaxial cable calculation benj <benj@nobody.net> - 2018-04-10 05:20 -0400
      Re: Coaxial cable calculation Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au> - 2018-04-10 19:33 +1000
        Re: Coaxial cable calculation benj <benj@nobody.net> - 2018-04-10 15:28 -0400
          Re: Coaxial cable calculation Sergio <invalid@invalid.com> - 2018-04-11 08:36 -0500
            Re: Coaxial cable calculation benj <benj@nobody.net> - 2018-04-11 14:38 -0400
              Re: Coaxial cable calculation Sergio <invalid@invalid.com> - 2018-04-11 13:55 -0500
        Re: Coaxial cable calculation benj <benj@nobody.net> - 2018-04-10 15:45 -0400
      Re: Coaxial cable calculation Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com> - 2018-04-10 12:24 +0200
        Re: Coaxial cable calculation benj <benj@nobody.net> - 2018-04-10 15:37 -0400
    Re: Coaxial cable calculation Sergio <invalid@invalid.com> - 2018-04-10 10:59 -0500
      Re: Coaxial cable calculation Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com> - 2018-04-10 18:21 +0200
        Re: Coaxial cable calculation Lofty Goat <rlwatkins@gmail.com> - 2018-04-10 11:32 -0500
          Re: Coaxial cable calculation Sergio <invalid@invalid.com> - 2018-04-10 11:44 -0500
            Re: Coaxial cable calculation benj <benj@nobody.net> - 2018-04-10 16:03 -0400
              Re: Coaxial cable calculation Sergio <invalid@invalid.com> - 2018-04-10 17:18 -0500
                Re: Coaxial cable calculation Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au> - 2018-04-11 08:24 +1000
                  Re: Coaxial cable calculation Sergio <invalid@invalid.com> - 2018-04-10 17:38 -0500
                    Re: Coaxial cable calculation Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au> - 2018-04-11 08:42 +1000
                  Re: Coaxial cable calculation benj <benj@nobody.net> - 2018-04-11 07:36 -0400
                    Re: Coaxial cable calculation Sergio <invalid@invalid.com> - 2018-04-11 08:38 -0500
                  Re: Coaxial cable calculation Lofty Goat <rlwatkins@gmail.com> - 2018-04-11 21:57 -0500
                Re: Coaxial cable calculation benj <benj@nobody.net> - 2018-04-11 07:23 -0400
                  Re: Coaxial cable calculation Sergio <invalid@invalid.com> - 2018-04-11 08:39 -0500
                    Re: Coaxial cable calculation Sergio <invalid@invalid.com> - 2018-04-11 11:20 -0500
      Re: Coaxial cable calculation Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au> - 2018-04-11 05:48 +1000
        Re: Coaxial cable calculation benj <benj@nobody.net> - 2018-04-10 16:10 -0400
        Re: Coaxial cable calculation Sergio <invalid@invalid.com> - 2018-04-10 17:30 -0500
        Re: Coaxial cable calculation Lofty Goat <rlwatkins@gmail.com> - 2018-04-11 21:57 -0500
      Re: Coaxial cable calculation benj <benj@nobody.net> - 2018-04-10 15:54 -0400
        Re: Coaxial cable calculation Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au> - 2018-04-11 06:01 +1000

Page 2 of 2 — ← Prev page 1 [2]

#680743

On 4/11/2018 6:36 AM, benj wrote:
> On 4/10/2018 6:24 PM, Trevor Wilson wrote:
>> On 11/04/2018 8:18 AM, Sergio wrote:
>>> On 4/10/2018 3:03 PM, benj wrote:
>>>> On 4/10/2018 12:44 PM, Sergio wrote:
>>>>> On 4/10/2018 11:32 AM, Lofty Goat wrote:
>>>>>> On Tue, 10 Apr 2018 18:21:42 +0200 (GMT+02:00), Libor Striz
>>>>>> <poutnik4REMOVEnntp@CAPITALSgmail.com> wrote:
>>>>>>
>>>>>>> Sergio <invalid@invalid.com> Wrote in message:
>>>>>>>> On 4/10/2018 1:42 AM, Trevor Wilson wrote:
>>>>>>>>> Here's a question that stumped me back in the old slide rule days:
>>>>>>>>>
>>>>>>>>> A coaxial cable, having an inner diameter of 0.0254mm (0.001") and
>>>>>>>>> using
>>>>>>>>> an insulator with a dielectric constant of 2.56, is yo have a
>>>>>>>>> characteristic impedance of 2,000 Ohms. What must be the outer
>>>>>>>>> conductor
>>>>>>>>> diameter?
>>>>>>>>>
>>>>>>>>> You guys can locate the appropriate method of calculation.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>> your question is malformed.
>>>>>>>>
>>>>>>>>    what is yo ?   don't  you mean Zo, which is normally used for
>>>>>>>> characteristic impedance of coaxial cables ?
>>>>>>>>
>>>>>>>> what frequency or frequency band ?
>>>>>>>>
>>>>>>>>
>>>>>>> Yo must mean you...
>>>>>>
>>>>>> Arcane symbol for admittance, the reciprocal of impedance.  Modern
>>>>>> texts
>>>>>> use sigma instead.
>>>>>>
>>>>>
>>>>> double checking, usually that is Yo, and measured in siemens, not
>>>>> ohms.
>>>>>
>>>>> so still need a clarification Trevor, do you mean Yo 2000 siemens
>>>>> or Zo
>>>>> 2000 Ohms ?
>>>>>
>>>>> and frequency band too, (there are places coax won't work)
>>>>>
>>>> Look at the science deniers squirm as they try to deny this typo!
>>>> Clearly Yo is NOT admittance, since Trevor himself say "is yo have a
>>>> characteristic impedance of 2,000 Ohms" He clearly used the word
>>>> "impedance" not "admittance". Anyway if anyone here knew any actual
>>>> practical science you'd know that a Zo of 1/2000 ohms gives a coax of
>>>> ridiculous dimensions. Won't find one on your TV I'm sure.
>>>>
>>>> TREVOR MADE A TYPO and that proves he's uneducated, ignorant and
>>>> insane!
>>>> Neener, Neener, Neener!
>>>>
>>>
>>> Initially I thought he meant "yo" like the urban "you", but that would
>>> be a misspelling, and he would not recognize a misspelled word.
>>>
>>> at least he posted some physics/science stuff in here, so He gets a B.
>>>
>>> also, when did calculators replace slide rules, in college ?
>>
>> **For me, I purchased my first scientific calculator sometime around
>> 1973. It cost me AUS$104.00. A huge sum for a student back then. I
>> could not afford the superior, Texas Instruments one. I still have my
>> favourite slide rule though. A Faber-Castell 2/83N Novo-Duplex. Best
>> slide rule ever made.
> 
> As for me, when he HP35 came out, I knew my life was saved. So in spite
> of the VERY high cost I just sucked it up and plunked em down. Don't
> about OZ but here there were these Ads all over TV for the "Bomar brain"
> which was like the first cheap 4 banger. They must have sold a lot until
> TI came out with their cheaper version of the HP.
> 
> For many years after slide rules disappeared I had a little plastic
> circular one that fit in my shirt pocket. I'd take to the grocery store
> and you could set price on one scale and package weight on the other and
> get a ratio going and that way I could easily determine the best buy
> even though all the packages were odd weights and different from each
> other.
> 
> But analog computing has no future...

there are a fewanaloge computers on Ebay, very pricy, and do little,
remember all those opamps, and dials ? could do earth moon orbits on it.

[toc] | [prev] | [next] | [standalone]

#680823

On Wed, 11 Apr 2018 08:24:24 +1000, Trevor Wilson wrote:

> I still have my favourite slide rule though. A Faber-Castell 2/83N
> Novo-Duplex. Best slide rule ever made.

When Dad got out of engineering detailing (a drafting job) and into
programming he gave me his: a Dietzgen.  I still have it.

-- 
Goat

[toc] | [prev] | [next] | [standalone]

#680737

On 4/10/2018 6:18 PM, Sergio wrote:
> On 4/10/2018 3:03 PM, benj wrote:
>> On 4/10/2018 12:44 PM, Sergio wrote:
>>> On 4/10/2018 11:32 AM, Lofty Goat wrote:
>>>> On Tue, 10 Apr 2018 18:21:42 +0200 (GMT+02:00), Libor Striz
>>>> <poutnik4REMOVEnntp@CAPITALSgmail.com> wrote:
>>>>
>>>>> Sergio <invalid@invalid.com> Wrote in message:
>>>>>> On 4/10/2018 1:42 AM, Trevor Wilson wrote:
>>>>>>> Here's a question that stumped me back in the old slide rule days:
>>>>>>>
>>>>>>> A coaxial cable, having an inner diameter of 0.0254mm (0.001") and
>>>>>>> using
>>>>>>> an insulator with a dielectric constant of 2.56, is yo have a
>>>>>>> characteristic impedance of 2,000 Ohms. What must be the outer
>>>>>>> conductor
>>>>>>> diameter?
>>>>>>>
>>>>>>> You guys can locate the appropriate method of calculation.
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> your question is malformed.
>>>>>>
>>>>>>    what is yo ?   don't  you mean Zo, which is normally used for
>>>>>> characteristic impedance of coaxial cables ?
>>>>>>
>>>>>> what frequency or frequency band ?
>>>>>>
>>>>>>
>>>>> Yo must mean you...
>>>>
>>>> Arcane symbol for admittance, the reciprocal of impedance.  Modern texts
>>>> use sigma instead.
>>>>
>>>
>>> double checking, usually that is Yo, and measured in siemens, not ohms.
>>>
>>> so still need a clarification Trevor, do you mean Yo 2000 siemens or Zo
>>> 2000 Ohms ?
>>>
>>> and frequency band too, (there are places coax won't work)
>>>
>> Look at the science deniers squirm as they try to deny this typo!
>> Clearly Yo is NOT admittance, since Trevor himself say "is yo have a
>> characteristic impedance of 2,000 Ohms" He clearly used the word
>> "impedance" not "admittance". Anyway if anyone here knew any actual
>> practical science you'd know that a Zo of 1/2000 ohms gives a coax of
>> ridiculous dimensions. Won't find one on your TV I'm sure.
>>
>> TREVOR MADE A TYPO and that proves he's uneducated, ignorant and insane!
>> Neener, Neener, Neener!
>>
> 
> Initially I thought he meant "yo" like the urban "you", but that would
> be a misspelling, and he would not recognize a misspelled word.
> 
> at least he posted some physics/science stuff in here, so He gets a B.

Actually I smell engineering rather than science. I say C.
For some reason engineers like to hang in Sci.physics pretending they 
are physicists arguing science.

> also, when did calculators replace slide rules, in college ?

Of course in the old days the way to demonstrate that you were nerdy 
beyond all belief was to have a slide rule case dangling from your belt 
in college. EeeW! Was like the coloring of a poisonous snake telling all 
hawt babes "don't touch"...unless you were there to bag a nerd with 
decent earning potential once graduated. But then came the HP35 and 
while Old man Hewlett insisted it fit a shirt pocket (actually was too 
long to fit nicely) suddenly the proper way to show nerdy class was now 
to have the leather HP35 pouch dangling from your belt. Given the price 
it did dual duty as a badge of nerdyness AND potential earning capacity.

> Extra Credit Question: anyone know what the term "lizard" means on
> campus ? (think way-way back)

[toc] | [prev] | [next] | [standalone]

#680744

On 4/11/2018 6:23 AM, benj wrote:
> On 4/10/2018 6:18 PM, Sergio wrote:
>> On 4/10/2018 3:03 PM, benj wrote:
>>> On 4/10/2018 12:44 PM, Sergio wrote:
>>>> On 4/10/2018 11:32 AM, Lofty Goat wrote:
>>>>> On Tue, 10 Apr 2018 18:21:42 +0200 (GMT+02:00), Libor Striz
>>>>> <poutnik4REMOVEnntp@CAPITALSgmail.com> wrote:
>>>>>
>>>>>> Sergio <invalid@invalid.com> Wrote in message:
>>>>>>> On 4/10/2018 1:42 AM, Trevor Wilson wrote:
>>>>>>>> Here's a question that stumped me back in the old slide rule days:
>>>>>>>>
>>>>>>>> A coaxial cable, having an inner diameter of 0.0254mm (0.001") and
>>>>>>>> using
>>>>>>>> an insulator with a dielectric constant of 2.56, is yo have a
>>>>>>>> characteristic impedance of 2,000 Ohms. What must be the outer
>>>>>>>> conductor
>>>>>>>> diameter?
>>>>>>>>
>>>>>>>> You guys can locate the appropriate method of calculation.
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> your question is malformed.
>>>>>>>
>>>>>>>    what is yo ?   don't  you mean Zo, which is normally used for
>>>>>>> characteristic impedance of coaxial cables ?
>>>>>>>
>>>>>>> what frequency or frequency band ?
>>>>>>>
>>>>>>>
>>>>>> Yo must mean you...
>>>>>
>>>>> Arcane symbol for admittance, the reciprocal of impedance.  Modern
>>>>> texts
>>>>> use sigma instead.
>>>>>
>>>>
>>>> double checking, usually that is Yo, and measured in siemens, not ohms.
>>>>
>>>> so still need a clarification Trevor, do you mean Yo 2000 siemens or Zo
>>>> 2000 Ohms ?
>>>>
>>>> and frequency band too, (there are places coax won't work)
>>>>
>>> Look at the science deniers squirm as they try to deny this typo!
>>> Clearly Yo is NOT admittance, since Trevor himself say "is yo have a
>>> characteristic impedance of 2,000 Ohms" He clearly used the word
>>> "impedance" not "admittance". Anyway if anyone here knew any actual
>>> practical science you'd know that a Zo of 1/2000 ohms gives a coax of
>>> ridiculous dimensions. Won't find one on your TV I'm sure.
>>>
>>> TREVOR MADE A TYPO and that proves he's uneducated, ignorant and insane!
>>> Neener, Neener, Neener!
>>>
>>
>> Initially I thought he meant "yo" like the urban "you", but that would
>> be a misspelling, and he would not recognize a misspelled word.
>>
>> at least he posted some physics/science stuff in here, so He gets a B.
> 
> Actually I smell engineering rather than science. I say C.
> For some reason engineers like to hang in Sci.physics pretending they
> are physicists arguing science.
> 
>> also, when did calculators replace slide rules, in college ?
> 
> Of course in the old days the way to demonstrate that you were nerdy
> beyond all belief was to have a slide rule case dangling from your belt
> in college. EeeW! Was like the coloring of a poisonous snake telling all
> hawt babes "don't touch"...unless you were there to bag a nerd with
> decent earning potential once graduated. But then came the HP35 and
> while Old man Hewlett insisted it fit a shirt pocket (actually was too
> long to fit nicely) suddenly the proper way to show nerdy class was now
> to have the leather HP35 pouch dangling from your belt. Given the price
> it did dual duty as a badge of nerdyness AND potential earning capacity.
> 
>> Extra Credit Question: anyone know what the term "lizard" means on
>> campus ? (think way-way back)
> 


yep, the engineers had Tails, the slide rule cases hanging off their belts.

[toc] | [prev] | [next] | [standalone]

#680768

On 4/11/2018 8:39 AM, Sergio wrote:
> On 4/11/2018 6:23 AM, benj wrote:
>> On 4/10/2018 6:18 PM, Sergio wrote:
>>> On 4/10/2018 3:03 PM, benj wrote:
>>>> On 4/10/2018 12:44 PM, Sergio wrote:
>>>>> On 4/10/2018 11:32 AM, Lofty Goat wrote:
>>>>>> On Tue, 10 Apr 2018 18:21:42 +0200 (GMT+02:00), Libor Striz
>>>>>> <poutnik4REMOVEnntp@CAPITALSgmail.com> wrote:
>>>>>>
>>>>>>> Sergio <invalid@invalid.com> Wrote in message:
>>>>>>>> On 4/10/2018 1:42 AM, Trevor Wilson wrote:
>>>>>>>>> Here's a question that stumped me back in the old slide rule days:
>>>>>>>>>
>>>>>>>>> A coaxial cable, having an inner diameter of 0.0254mm (0.001") and
>>>>>>>>> using
>>>>>>>>> an insulator with a dielectric constant of 2.56, is yo have a
>>>>>>>>> characteristic impedance of 2,000 Ohms. What must be the outer
>>>>>>>>> conductor
>>>>>>>>> diameter?
>>>>>>>>>
>>>>>>>>> You guys can locate the appropriate method of calculation.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>> your question is malformed.
>>>>>>>>
>>>>>>>>    what is yo ?   don't  you mean Zo, which is normally used for
>>>>>>>> characteristic impedance of coaxial cables ?
>>>>>>>>
>>>>>>>> what frequency or frequency band ?
>>>>>>>>
>>>>>>>>
>>>>>>> Yo must mean you...
>>>>>>
>>>>>> Arcane symbol for admittance, the reciprocal of impedance.  Modern
>>>>>> texts
>>>>>> use sigma instead.
>>>>>>
>>>>>
>>>>> double checking, usually that is Yo, and measured in siemens, not ohms.
>>>>>
>>>>> so still need a clarification Trevor, do you mean Yo 2000 siemens or Zo
>>>>> 2000 Ohms ?
>>>>>
>>>>> and frequency band too, (there are places coax won't work)
>>>>>
>>>> Look at the science deniers squirm as they try to deny this typo!
>>>> Clearly Yo is NOT admittance, since Trevor himself say "is yo have a
>>>> characteristic impedance of 2,000 Ohms" He clearly used the word
>>>> "impedance" not "admittance". Anyway if anyone here knew any actual
>>>> practical science you'd know that a Zo of 1/2000 ohms gives a coax of
>>>> ridiculous dimensions. Won't find one on your TV I'm sure.
>>>>
>>>> TREVOR MADE A TYPO and that proves he's uneducated, ignorant and insane!
>>>> Neener, Neener, Neener!
>>>>
>>>
>>> Initially I thought he meant "yo" like the urban "you", but that would
>>> be a misspelling, and he would not recognize a misspelled word.
>>>
>>> at least he posted some physics/science stuff in here, so He gets a B.
>>
>> Actually I smell engineering rather than science. I say C.
>> For some reason engineers like to hang in Sci.physics pretending they
>> are physicists arguing science.
>>
>>> also, when did calculators replace slide rules, in college ?
>>
>> Of course in the old days the way to demonstrate that you were nerdy
>> beyond all belief was to have a slide rule case dangling from your belt
>> in college. EeeW! Was like the coloring of a poisonous snake telling all
>> hawt babes "don't touch"...unless you were there to bag a nerd with
>> decent earning potential once graduated. But then came the HP35 and
>> while Old man Hewlett insisted it fit a shirt pocket (actually was too
>> long to fit nicely) suddenly the proper way to show nerdy class was now
>> to have the leather HP35 pouch dangling from your belt. Given the price
>> it did dual duty as a badge of nerdyness AND potential earning capacity.
>>
>>> Extra Credit Question: anyone know what the term "lizard" means on
>>> campus ? (think way-way back)
>>
> 
> 
> yep, the engineers had Tails, the slide rule cases hanging off their belts.
> 

Zo = (L/C)^(0.5) = 138*log(D/d)/((ur*er)^0.5


Solve for D

D = d * 10^(Zo * )(ur*er)^0.5) /138)

ur typically 1 = relative permeability

D= 0.001 * 10^ (2000* ((1*2.56)^0.5) /138) = 0.001 * 10^23 = 10^20

       which says Zo is too big, probably a typo, extra 0.


take a max sized coax where D/d is 100

Zo = 138*2/1.6 = 172 ohms

   Super max D/d = 1000

Zo = 138*3/1.6 = 258

so a Zo of greater than 250 is becoming unrealizable, inner conductor
fried by power levels, too much plastic, cable too fat

and this degenerates into single wire impeadance, OR circular waveguide,
as you remove outer shield or inner wire, and you can leave the plastic
on, or remove it, and that depends upon frequency

the above #'s were not generated with a slide rule, could not find the
batteries.

[toc] | [prev] | [next] | [standalone]

#680646

On 11/04/2018 1:59 AM, Sergio wrote:
> On 4/10/2018 1:42 AM, Trevor Wilson wrote:
>> Here's a question that stumped me back in the old slide rule days:
>>
>> A coaxial cable, having an inner diameter of 0.0254mm (0.001") and using
>> an insulator with a dielectric constant of 2.56, is yo have a
>> characteristic impedance of 2,000 Ohms. What must be the outer conductor
>> diameter?
>>
>> You guys can locate the appropriate method of calculation.
>>
>>
> 
> your question is malformed.
> 
>   what is yo ?


**Typo. The word is 'to'.

    don't  you mean Zo, which is normally used for
> characteristic impedance of coaxial cables ?

**Same thing.

> 
> what frequency or frequency band ?


**Irrelevant.


-- 
Trevor Wilson
www.rageaudio.com.au

[toc] | [prev] | [next] | [standalone]

#680654

On 4/10/2018 3:48 PM, Trevor Wilson wrote:
> On 11/04/2018 1:59 AM, Sergio wrote:
>> On 4/10/2018 1:42 AM, Trevor Wilson wrote:
>>> Here's a question that stumped me back in the old slide rule days:
>>>
>>> A coaxial cable, having an inner diameter of 0.0254mm (0.001") and using
>>> an insulator with a dielectric constant of 2.56, is yo have a
>>> characteristic impedance of 2,000 Ohms. What must be the outer conductor
>>> diameter?
>>>
>>> You guys can locate the appropriate method of calculation.
>>>
>>>
>>
>> your question is malformed.
>>
>>   what is yo ?
> 
> 
> **Typo. The word is 'to'.

Trevor's failure as a lib and wormballer!
Typo proves he's insane kook!


>     don't  you mean Zo, which is normally used for
>> characteristic impedance of coaxial cables ?
> 
> **Same thing.

Libs know many many words that mean more or less the same things. That's 
what makes them great liars.

>>
>> what frequency or frequency band ?
> 
> 
> **Irrelevant.

More Proof that Trevor not only does NOT know any science but did not 
even bother to read the wikipedia article I referenced for his lazy ass.
If he had, he would not be making stupid statements like frequency is 
irrelevant and then have his ass handed to him.

[toc] | [prev] | [next] | [standalone]

#680680

On 4/10/2018 2:48 PM, Trevor Wilson wrote:
> On 11/04/2018 1:59 AM, Sergio wrote:
>> On 4/10/2018 1:42 AM, Trevor Wilson wrote:
>>> Here's a question that stumped me back in the old slide rule days:
>>>
>>> A coaxial cable, having an inner diameter of 0.0254mm (0.001") and using
>>> an insulator with a dielectric constant of 2.56, is yo have a
>>> characteristic impedance of 2,000 Ohms. What must be the outer conductor
>>> diameter?
>>>
>>> You guys can locate the appropriate method of calculation.
>>>
>>>
>>
>> your question is malformed.
>>
>>   what is yo ?
> 
> 
> **Typo. The word is 'to'.
> 
>    don't  you mean Zo, which is normally used for
>> characteristic impedance of coaxial cables ?
> 
> **Same thing.

another mistake! they are not the same thing.  "to" is a preposition,

and you typed yo, which is yo mama, or which is a malformed Yo which is
1/Zo.  Zo is characteristic impedance, which is typically a complex
number at a given frequency


>>
>> what frequency or frequency band ?
> 
> 
> **Irrelevant.


Wrong again, you can calculate it, but it may be below cutoff, therefor
useless.

We also need the power level in watts, to see if your inner diameter is
large enough, and can we assume copper or steel ? or do we need silver
plated copper ? (again we need the frequency band)

[toc] | [prev] | [next] | [standalone]

#680822

On Wed, 11 Apr 2018 05:48:37 +1000, Trevor Wilson wrote:

>>   what is yo ?
>
>**Typo. The word is 'to'.

ROFL.  Gotta be careful.  In electronics, every combination of two
letters or a letter and a numeral, and a great many of three such
symbols, means *something*.  [grin]

-- 
Goat

[toc] | [prev] | [next] | [standalone]

#680647

On 4/10/2018 11:59 AM, Sergio wrote:
> On 4/10/2018 1:42 AM, Trevor Wilson wrote:
>> Here's a question that stumped me back in the old slide rule days:
>>
>> A coaxial cable, having an inner diameter of 0.0254mm (0.001") and using
>> an insulator with a dielectric constant of 2.56, is yo have a
>> characteristic impedance of 2,000 Ohms. What must be the outer conductor
>> diameter?
>>
>> You guys can locate the appropriate method of calculation.
>>
>>
> 
> your question is malformed.
> 
>   what is yo ?   don't  you mean Zo, which is normally used for
> characteristic impedance of coaxial cables ?
> 
> what frequency or frequency band ?

Trevor notes that you didn't calculate his answer either!
Sergio, you are obviously as ignorant and uneducated as I am!

And even worse! Have Nads and "kensi" spank my butt red for missing 
Trevor's Typo (is yo instead of if You) DAMN!! DAMN!! DAMN! I AM as 
ignorant as Trevor says. Trevor with a typo and I missed the chance to 
zip him in a rubber suit, put a red rubber ball in his mouth and whip 
his behind with switch until he squeals with incredible pleasure. Trevor 
has established the rule that anyone with a typo or misspelling is 
uneducated, ignorant and insane.

[toc] | [prev] | [next] | [standalone]

#680650

On 11/04/2018 5:54 AM, benj wrote:
> On 4/10/2018 11:59 AM, Sergio wrote:
>> On 4/10/2018 1:42 AM, Trevor Wilson wrote:
>>> Here's a question that stumped me back in the old slide rule days:
>>>
>>> A coaxial cable, having an inner diameter of 0.0254mm (0.001") and using
>>> an insulator with a dielectric constant of 2.56, is yo have a
>>> characteristic impedance of 2,000 Ohms. What must be the outer conductor
>>> diameter?
>>>
>>> You guys can locate the appropriate method of calculation.
>>>
>>>
>>
>> your question is malformed.
>>
>>   what is yo ?   don't  you mean Zo, which is normally used for
>> characteristic impedance of coaxial cables ?
>>
>> what frequency or frequency band ?
> 
> Trevor notes that you didn't calculate his answer either!
> Sergio, you are obviously as ignorant and uneducated as I am!

**Unlikely. You are pretty stupid.




-- 
Trevor Wilson
www.rageaudio.com.au

[toc] | [prev] | [standalone]

Page 2 of 2 — ← Prev page 1 [2]

Back to top | Article view | sci.physics

csiph-web