"Larry W4CSC" wrote in message
...
I'd rather see shielded connectors so I can run shielded pair cables and
RF
bypassing of all inputs to keep the HF SSB from screwing all the NMEA crap
attached to it. Shielding everything would also make it so we could HEAR
the HF receiver and get our WEFAXes without the constant drone of NMEA
radiated interference from all the unshielded, unbalanced connections with
just open wires sticking out of things. NMEA needs to get its act
together
and enforce some standards on its members....

Funny thing is: you don't need shielded connectors to be HF-quiet. The
physical size of two screw terminals and an inch of bare wire ends are
simply not enough to be able to radiate sufficient RF. What does radiate on
HF are long cable runs that are either unshielded or unbalanced. Raymarine
have put our multiplexers to the test to comply with IEC945 for instance,
which limits for susceptibility and emission are rougly ten times more
stringent than FCC Part 15 class B. And it passed that test while being in a
plastic box and having screw-terminals. The really important thing is to
have it wired correctly and, most important, not to connect a shield *at
both ends*.

Meindert