How should shielding be grounded on an NMEA 0183 data line?

Get ready for the FCC General Radiotelephone Operator License (GROL) exam. Study with flashcards and multiple choice questions, each with hints and detailed explanations. Prepare effectively for your licensing test!

Multiple Choice

How should shielding be grounded on an NMEA 0183 data line?

Grounding the shield at only one end is the best practice because it uses the shield to drain EMI without creating a ground loop between devices. For an NMEA 0183 data line, connect the shield to ground at the source (talker) end and do not connect or terminate the shield at the far end (the listener). This lets noise picked up along the cable be carried to ground near the source, while avoiding a current path that could flow along the shield between the ship’s different ground potentials. Grounding both ends can create unwanted shield currents and loops that introduce interference into the data. So, shielding is grounded at the talker end and left unterminated at the listener.

Grounding the shield at only one end is the best practice because it uses the shield to drain EMI without creating a ground loop between devices. For an NMEA 0183 data line, connect the shield to ground at the source (talker) end and do not connect or terminate the shield at the far end (the listener). This lets noise picked up along the cable be carried to ground near the source, while avoiding a current path that could flow along the shield between the ship’s different ground potentials. Grounding both ends can create unwanted shield currents and loops that introduce interference into the data. So, shielding is grounded at the talker end and left unterminated at the listener.

More practice questions