LED Lighting Risks of Maritime Radio Interference
Known for their reduced energy consumption, lower operating temperatures and longer life expectancies, LED lighting can be found on board vessels ranging from cargo ships to luxury yachts to smaller recreational watercraft. But those LED lamps may also cause electromagnetic interference, or EMI, which can result in poor reception on VHF frequencies, a U.S. Coast Guard alert warns.
While larger vessels are increasingly using radar, advanced GPS and other sophisticated technologies that are less likely to be affected by LED light radio interference, there is still the potential that it could create a safety threat at sea. There is also the risk that smaller boats, such asluxury yachts and other personal watercraft, affected by radio interference could pose a hazard to other vessels if they are having difficulty communicating.
Testing for the Presence of LED Radio Light Interference with VHF Frequencies
According to the Coast Guard, maritime radio users might not be immediately aware of strong LED light interference. “Testing for potential radio interference can help protect mariners by being aware of an issue before a problem arises,” Shanley said. Mariners can then take steps to help minimize the risk of radio frequency interference, such as switching out the interfering LEDs for other compliant lighting.
The Coast Guard recommends five steps to help test for the presence of LED interference:
- Tune the VHF radio to a quiet channel.
- Adjust the VHF radio’s squelch control until the radio outputs audio noise.
- Readjust the VHF radio’s squelch control until the audio noise is quiet, only slightly above the noise threshold.
- Turn on the LED lights. If the radio now outputs audio noise, then the LED lights have raised the noise floor. If the radio does not output audio noise, then the LED lights have not raised the noise audio floor.
The noise floor is generally the amount of interfering signals or static received beyond the specific signal or channel being monitored. A raised noise floor generally indicates that both shipboard VHF marine radio and AIS reception are being degraded by LED lighting, according to the Coast Guard. In order to determine the full impact of LED light radio interference, the Coast Guard requests those experiencing this problem to report their experiences using the contact form on theCoast Guard Navigation Centerwebsite.
Minimizing Radio Frequency Interference
LED lamps, such as those found in navigation lights, searchlights, floodlights, and interior and exterior lights can lead to radio frequency interference. The Coast Guard reported that LED lighting installed near VHF antennas has also shown to compound reception problems.
There are ways to minimize radio frequency interference, such as using only interior and exterior LED lights that are designed to eliminate EMI and that are certified to international maritime standards. Such LED lights avoid the frequency range between 156 MHz and 165 MHz, which is the frequency used by marine VHF and AIS systems.
Mariners can help protect against the risks of radio interference by inspecting all LED lamps to ensure that they are compliant with international maritime standards, by testing LED lights for signs of radio interference and by changing lights that cause interference.
旅行ers can help ocean marine service suppliers, marine transportation companies and ocean cargo companies learn more about protecting their businesses from these and othermaritime safety concerns.
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