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"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 |
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