At 11:37 PM 10/6/2005, Ian White G/GM3SEK wrote:
>K7LXC wrote:
> >Howdy, TowerTalkians --
> >
> > Thanks to everyone for their input - I got lots of comments.
> >
> > I went back to the site today and checked the antenna again. This time
> >the swr was high and there was no dip anywhere - classic bad feedline
> symptoms.
> >
> > So we're going to try it again on Monday - this time replacing the balun
> >and working our way down the feedline to the shack. I'll let you know what
> >transpires.
> >
>
>In case this point was buried in my previous post, when SWR-testing the
>feedline and antenna, it's always a good idea to leave a 50R load
>connected in the shack.
And it doesn't have to be any high power load, either. A scrounged up 50
ohm BNC termination from a dismantled coax Ethernet installation would work
fine. (but check to see if it's really 50 ohms).
For that matter, a 75 ohm termination (viz cable tv) could also work,
because at least you'd know what to expect.
>At each place where you break the feedline, you can test SWR in both
>directions so you have twice as much information.
Jim, W6RMK
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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