[time-nuts] 75Z vs 50Z for GPS receivers

[Brooke Clarke]

Hi Bill:

The series elements are resistance and inductance.
The shunt elements are conductance G (leakage resistance expressed in 
Mho or Siemens) and capactance
For long lines the resistance of the wires is very important and for low 
frequencies the capactance is the dominant reactance.
see the plot: http://www.pacificsites.com/~brooke/Zo.shtml#RG58

On telegraph circuits where they are sending pulses a rule of thumb was 
one battery for each mile of line.  For more on wet cell batteries see:
http://www.pacificsites.com/~brooke/Leclanche.shtml

Have Fun,

Brooke Clarke

w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com



Bill Hawkins wrote:

>Dave Brown said, in part,
>
>"The characteristic impedance of a transmission
>line, in purely general terms, is given by the square root of R plus
>jw L divided by G plus jw C, with the usual meaning for symbols used."
>
>Well, I know most of those symbols, but what's gravity (G) doing in
>that equation? By dimensional analysis, G must be conductance, so we
>have Ohms^2 under the root, and the answer is in Ohms.
>
>So, what is R the resistance of, and what has conductance G?
>
>Bill Hawkins
>
>
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