On 31 Dec 2005 16:51:02 -0800, "
wrote:

I wonder if u could help me, i have a tri-band beam erected and am
considering using 450 ohm feeder due to the less amount of loss on the
line (as opposed to RG58)

The radio i am using is an IC-756PROII, with inbuilt ATU, will i be
able to connect the feeder direct to the beam and run it straight into
the back of my 756 (using 259 connector) ??

Or will i requrie a balun at either the beam or radio end???

hope you can shed some light on this, have got a bit confused with it

It would have helped if you disclosed the feedline length, it has
bearing on selection of solutions.

On the one hand, one respondent has told you 200m of RG8 is ok (that
is about 6dB of loss at 28MHz), and another has told you that the VSWR
on 450 ohm line will make it unattractive... you can only make these
calls if the length of the feedline is known (and the 450 ohm line
need not operate at high VSWR).

Do you rotate this beam? Will you need a coax tail at the rotator, or
have you some scheme in mind for using open wire line at this point?

There is probably already a balun at the beam feedpoint... but you
will probably continue need to use coax right close to the beam (the
rotator issue).

Owen
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