[aprssig] Why is coax 50 ohm ?

[Ron Stordahl]

To match the impedance of 1) Vertical = 50 ohms, 2) Dipole = 72 ohm.  
These are not exact values, but are close enough, thus cable is built to 
be used with each.

Ron, N5IN

Andrew Rich wrote:
> Is there a reason why coax is 50 ohm ?
>  
> And 75 ohm ?
>  
> And 92 ohms ?
>  
> Is it historical or is there a scienific reason why ?
>
> -----------------------------------------
> Andrew Rich
> Amateur radio callsign VK4TEC
> email: vk4tec at tech-software.net <mailto:vk4tec at tech-software.net>
> web: http://www.tech-software.net
> Brisbane AUSTRALIA
>
>  
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