The interference hunt was an interesting article. The simple fix of using a set of directional antennas would work but is likely to run afoul of the FCC Rules as using higher gain antennas are generally prohibited unless they are Certified with the transmitter.
LED sign companies are probably still very mindful of the FCC scrutiny of their industry in 2018-2019. The Enforcement Bureau investigated hundreds of products resulting in a least 21 settlement agreements with fines as high as $115K. To settle its respective investigation, each company verified that the models at issue were brought into compliance with FCC rules, agreed to pay a monetary penalty, and committed to abide by a compliance plan to improve internal procedures to avoid future violations. The compliance plans are painful and typically include filing detailed reports with the FCC for 3 years. FCC Enforcement Advisory https://docs.fcc.gov/public/attachments/DA-19-90A1.pdf Bob Sykes Semi-Retired EMC Engineer From: Ken Javor <[email protected]> Sent: Saturday, March 22, 2025 7:51 PM To: [email protected] Subject: [EXTERNAL] Re: [PSES] Tracking down interference at 915 MHz Nice. Seems as if a simpler fix would be a set of directional antennas for the gas station’s 915 MHz link, yielding higher intentional signal and if the antennas are properly oriented relative to the suspected interference source, diminishing Nice. Seems as if a simpler fix would be a set of directional antennas for the gas station’s 915 MHz link, yielding higher intentional signal and if the antennas are properly oriented relative to the suspected interference source, diminishing the interference level. -- Ken Javor Ph: (256) 650-5261 From: Ken Wyatt <[email protected]<mailto:[email protected]>> Reply-To: ***** IEEE emc-pstc List ***** <[email protected]<mailto:[email protected]>> Date: Saturday, March 22, 2025 at 3:35 PM To: <[email protected]<mailto:[email protected]>> Subject: [PSES] Tracking down interference at 915 MHz Hi All, I thought this interference hunt to a gas station price sign might be of interest to the group. https://www.testandmeasurementtips.com/spectrum-measurements-shed-light-on-sign-malfunctions/<https://urldefense.com/v3/__https:/www.testandmeasurementtips.com/spectrum-measurements-shed-light-on-sign-malfunctions/__;!!IJTm5Pv7pnzb!M9RG5AW6cmlqcZzI8PXw8zvb-2UbjmXLyJ5UppK6uojOumeMpfIWJyzTgu5iPZnJfiybxLd1_iFR-aiNvJ3ZdLq7XA$> Cheers, Ken _______________________ I'm here to help you succeed! 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