Hi,
I am constructing an 80m 4 Square using DXE phasing unit. The instructions
clearly say to not add any matching components or decoupling devices like
baluns or coils between the phasing unit and the verticals.
I am using 4 elevated radials at about 9 feet height (I would rather not debate
that decision further…). It is usually suggested to use a common mode choke on
any antenna feed point, especially for elevated radials. Adding an
conventional choke would likely change my phasing.
So, I am looking for more information about making a current choke that does
not change the electrical length of the phasing coax cables. Is making a stack
of a few ferrite cores right on the feedline (maybe with a few coils if I have
the length available) ok to do?
I have read http://www.nu9n.com/images/RFI-Ham.pdf, and current chokes are
extensively discussed there. My question is whether winding on the phasing coax
or sliding over the coax will change phasing or not. I am thinking it does not,
but wanted to check here…
73
Andy
KU7T
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