On Tue,9/13/2016 8:44 AM, Lionel Booth wrote:
My question to the group is whether there is any specific experience with this
manufacturer as guidance when I rip into this monster?
Lionel,
The noise is produced by a switch-mode power supply inside the unit, and
is probably radiated as a common mode signal by the AC wiring. That part
of it can be killed by winding the power cord through one or more #31
Fair-Rite cores to form a common mode choke. Follow the guidelines in
Chapter 7 of k9yc.com/RFI-Ham.pdf for the bands where you hear the
noise, and for coax the size of the power cable. That is, if the power
cable is the diameter of RG59/RG8X, use the guidelines for that coax.
There may be more noise radiated from internal wiring. For that, you'll
need to go inside the box.
AC line filters are a waste of money for this sort of problem.
73, Jim K9YC
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