Yo,
So, several years ago I had a 6M stack with 2 antennas. The feedline
from the stack box was 50 ohms for a short distance (turning loop) then all
the rest of the way into the operating position was the 75 ohm 3/4" TV
"hard line". This has been the only system I've had whereby obtaining the
best SWR was accomplished by utilizing a hack saw.
Worked fine as my excursions were never beyond 50080 to 50200. Saw the
station end of the hardline a bit, put on the connector, check the SWR.
Rinse and repeat until it was good.It worked great until dismantling it in
favor of a new array a couple of years ago.
73 and I remain,
Lew w7ew
On Fri, Dec 13, 2013 at 4:07 PM, Steve Hunt <steve@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@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|