Build 1/12th wave coaxial transformers on each end. Easily done if you are
not happy with the swr. My last install for a 20m stack was almost 300
feet of the 3/4" catv with trannys on each end. Tested into a dummy load I
could find no swr to speak of.....and the swr after all the antennas were
up in my worst case combination is no higher than 1.3:1. I might add that
I am also using 1/2" catv from the phasing/switchbox to the tail of RG213
connected to the antennas.
On Fri, 29 Oct 2004 11:33:28 -0400, Tim Holmes <W8TAH@Zoominternet.net>
> Yeah, thats what I was worrying about-- If anyone has any good
> suggestions, I would love to hear them, I hate to have this stuff just
> sitting around, not doing anything.
> >I would be concerned also, since the cable can cause an SWR
> >of over 2:1 at the radio.
> >Most VHF and UHF radios do not tolerate such a high SWR this
> >very well.
> >What you can do is build a transformer using lengths of 50
> >and 75 ohm cable mixed. It is pretty tricky to do this at
> >UHF, but it can be done if you have the test gear and are
> >careful. I don't have references, but I'd bet someone else
> >does. The devices are called non-synchronous transformers.
> >I certainly look into matching the cable at VHF or UHF, not
> >because of cable loss but because of bandwidth and impedance
> >problems at the radio. A 2:1 SWR is not good for most
> >73 Tom
> 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.
> TowerTalk mailing list
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.
TowerTalk mailing list