[TowerTalk] RG-149: 50 ohm/70 ohm - does it matter?

[Ron Hill]

I have used nothing but 75 Ohm CATV hardline to feed several yagis on
multiple towers for 20 years.

SWR is not perfect but the 87A has never had an issue with it.

Ron
W7NN

HamStuff by W7NN
www.HamStuff.com


On Fri, Dec 13, 2013 at 4:07 PM, Steve Hunt <steve at karinya.net> wrote:

> If you feed a perfect 50 Ohm load through a length of 75 Ohm transmission
> line, the SWR(50) at the input of the line will vary from 1:1 to 2.25:1
> depending on the length of the line.
>
> 36% of all possible line lengths will cause the input SWR(50) to be 2:1 or
> higher.
>
> If it's a multiband antenna it may be difficult to avoid that 36% on all
> bands!
>
> Steve G3TXQ
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>