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

Neon John jgd at johngsbbq.com
Sun Jan 28 16:19:12 EST 2007


On Sun, 28 Jan 2007 13:02:39 -0800, Brooke Clarke <brooke at pacific.net>
wrote:


>Long ago Bob Grove promoted the idea of using 75 Ohm TV coax for ham 
>antennas at 2 meters and higher frequencies because it had lower loss 
>than 50 Ohm coax and was much lower in cost.  For ham applications the 
>VSWR due to the coax impedance was much smaller than the inherent match 
>(mismatch) of the things on either end.

yes.  I started doing that in the late 70s when a large quantity of
CATV hard line fell into my possession.  I did some loss measurements
on a 500 ft roll and was pleasantly surprised to find the loss much
less than a roll of 1/2" 50 ohm hard line that I also had on hand.


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