Re: [Phys-l] physics of dissipation

[Bernard Cleyet <bernardcleyet@redshift.com>]

Is there anything that isn't (other than a perfect vacuum)?

Depends;  "good" cable w/ N connectors are DC to > one GigHz.  L  
band.  Short lengths for connecting X band elements.

bc has a x-band quide w/ an N socket and a big horn with an N  
connector (L band)

p.s. note the short lengths loss rises above DC.

On 2009, Nov 04, , at 10:22, chuck britton wrote:

> JD writes:
>
> > Nyquist's model can be boiled down to a single sentence:  An
> > ohm is an ohm is an ohm, and a coaxial cable is 50 ohms.  That
> > is, we model the energy being "dissipated" in terms of energy
> > being _radiated_ into an infinitely-long piece of coax.
> >
> > This gives a perfect model of dissipation.
>
> Yes, I've wondered about '50 ohm' coax and such.
> Isn't this '50 Ohms' somewhat frequency dependent?
>
> Or is it as simple and universal concept as you imply?
> _______________________________________________
> Forum for Physics Educators
> Phys-l@carnot.physics.buffalo.edu
> https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l

On 2009, Nov 04, , at 10:22, chuck britton wrote:

> JD writes:
>
> > Nyquist's model can be boiled down to a single sentence:  An
> > ohm is an ohm is an ohm, and a coaxial cable is 50 ohms.  That
> > is, we model the energy being "dissipated" in terms of energy
> > being _radiated_ into an infinitely-long piece of coax.
> >
> > This gives a perfect model of dissipation.
>
> Yes, I've wondered about '50 ohm' coax and such.
> Isn't this '50 Ohms' somewhat frequency dependent?
>
> Or is it as simple and universal concept as you imply?
> _______________________________________________
> Forum for Physics Educators
> Phys-l@carnot.physics.buffalo.edu
> https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l