What really struck me was how busy the 915 MHz ISM band was utilized in an urban environment! See Figure 5 in the article. This was a swept measurement in Max Hold mode over a period of about a minute and you can see the average signal amplitude was 50 dBµV, with strong peaks from the drug store to 70 dBµV.
_______________________ I'm here to help you succeed! Feel free to call or email with any questions related to EMC or EMI troubleshooting - at no obligation. I'm always happy to help! Kenneth Wyatt Wyatt Technical Services LLC 8201 Lighthouse Lane Ct Windsor, CO 80528 > On Mar 23, 2025, at 12:43 PM, Ken Javor <ken.ja...@emccompliance.com> wrote: > > My suggestion was not for the original installation, but as a suggested fix > after Ken’s troubleshoot appeared to pinpoint the source of the interference. > > -- > > Ken Javor > Ph: (256) 650-5261 > > > From: Ralph McDiarmid <rmm.priv...@gmail.com> > Reply-To: ***** IEEE emc-pstc List ***** <EMC-PSTC@listserv.ieee.org> > Date: Sunday, March 23, 2025 at 12:08 PM > To: <EMC-PSTC@LISTSERV.IEEE.ORG> > Subject: Re: [PSES] Tracking down interference at 915 MHz > > I agree Ken. Unfortunately, installation companies don’t have that degree of > technical prowess or care, they just go in, do a job as fast as possible, and > move on. The owner of the gas station would be oblivious to the EMC concern. > > Ralph > > From: Ken Javor <ken.ja...@emccompliance.com> > Sent: March 22, 2025 4:51 PM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: 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 the interference level. > > -- > > Ken Javor > Ph: (256) 650-5261 > > > From: Ken Wyatt <k...@emc-seminars.com <mailto:k...@emc-seminars.com>> > Reply-To: ***** IEEE emc-pstc List ***** <EMC-PSTC@listserv.ieee.org > <mailto:EMC-PSTC@listserv.ieee.org>> > Date: Saturday, March 22, 2025 at 3:35 PM > To: <EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG>> > 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://www.testandmeasurementtips.com/spectrum-measurements-shed-light-on-sign-malfunctions/> > > Cheers, Ken > > _______________________ > > I'm here to help you succeed! Feel free to call or email with any questions > related to EMC or EMI troubleshooting - at no obligation. I'm always happy to > help! > > Kenneth Wyatt > Wyatt Technical Services LLC > 8201 Lighthouse Lane Ct > Windsor, CO 80528 > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. 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