[AMRadio] Antenna/Coax


Edward B Richards zuu6k at juno.com
Sun Dec 31 13:56:03 EST 2006


That is the free space Z. Closer to the earth and other objects, the z
gets lower.

73, Ed Richards K6UUZ
Simi Valley, Ca 93065
Home of the Air Force 1 pavilion

On Sat, 30 Dec 2006 22:45:02 -0600 Jack Schmidling <jack at schmidling.com>
writes:
> The more I read, the confusder I get.
> 
> If a half wave dipole has a center feedpoint impedance of 73 ohms, 
> why 
> am I using 50 ohm coax.
> 
> I just put my new EZ hang to use today and discovered that my coax 
> is 
> not long enough to take advantage of the much higher ends and is 
> pulling 
> the center down.
> 
> I was going to buy a roll of RG8X but then learned that RG58U is 
> good to 
> over 430W so I might as well stick with this as weight is an issue.
> 
> In the process of hunting up a source for coax I stumbled into this 
> 
> quandary.  Every source I look at says 73 ohms for a dipole.
> 
> What am I missing?
> 
> JACK K9ACT
> 
> -- 
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