Re: Coaxial cable calculation

From	Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au>
Newsgroups	sci.physics
Subject	Re: Coaxial cable calculation
Date	2018-04-10 19:33 +1000
Message-ID	<fj3eoaFojsaU2@mid.individual.net> (permalink)
References	<fj34maFmfo5U1@mid.individual.net> <Ll%yC.14677$c03.3978@fx18.iad>

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On 10/04/2018 7:20 PM, benj wrote:
> On 4/10/2018 2:42 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.
> 
> You think that nobody is smart enough to even Google?
> 
> Answer is right in Wikipedia, you idiot.
> 
> https://en.wikipedia.org/wiki/Coaxial_cable
> 
> But wait, this takes a little knowledge of mathematics so that lets you 
> out. Slide rules were a stupid idea when it was a new idea. Hint: nobody 
> even knows what they are anymore.

**I do. I still use a couple. Mostly for intellectual stimulation and a 
bit of fun. My scientific calculators make life too easy. The nice thing 
about slide rules is that you need to have a rough idea of the answer 
before you start.

> 
> Just write L/C take square root set to 2000 and solve for inside 
> diameter of outer conductor. Like I said you do need to know some algebra.
> 
> It's obvious you are not asking for the complex impedance since you 
> didn't give enough information for that. Any idea what we are talking 
> about here genius?

**I note your inability to supply a correct answer.

NEXT!


-- 
Trevor Wilson
www.rageaudio.com.au

Thread

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

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