On 9/23/2023 9:20 AM, nlsa@nlsa.com wrote:
I have several dB of broadband RFI in my 2m EME system. I suspect that some
of it results from ethernet cabling. The station has about a dozen modules
(SDR, transverter, SSPA, etc.) that are all connected to a central Ethernet
switch. I have used STP or S/FTP cables throughout but I am confused about
how these cables should be grounded. Should I defeat the shield ground by
taping the outside of the connectors at one end? If so, should it be at the
Ethernet switch or the distal ends at each module?
They should not be "grounded," but the shields MUST be terminated to the
shell of the connectors on PROPERLY manufactured switches. That means
that everything about the equipment is properly manufactured. Properly
manufactured means that the shells of those connectors must be bonded to
the shielding enclosure at the point of entry, and that all conductors
leaving the enclosure must be properly terminated, and conductors that
are not shielded must exit via a feedthrough cap. I don't know anything
about the quality of currently manufactured equipment, but my gut tells
me it ain't the cheap stuff, and even expensive ain't guaranteed to be
right.
73, Jim K9YC
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