The Valley Radio Club is making an effort to assist in tracking down and resolve RFI problems effecting radio communications. Our goal is to work locally with property owners and utility companies to identify and resolve potential RFI issues. Resolving such issues locally benefits all of us.
Unresolved RFI complaints can be referred to the Federal Communications Commission (FCC) for resolution. We firmly believe that resolving issues locally, in an informal manner, is far more desirable than referring issues to the FCC. In the end, it is the FCC that maintains the ultimate regulatory responsibility for addressing RFI issues impacting the proper options of licensed communications services.
Many things can cause RFI such as, but not limited to, the items listed below:
Poorly designed or manufactured consumer electronics which may be in violation of Federal Communications Commission part 15 rules and regulations.
Loose of poor electrical connections within distribution and building electrical systems.
Lighting and lamp Dimmers
Indoor high power grow lighting systems
Door Bell Transformers
Older Compact Fluorescent Lamps
We first characterize the source by monitoring for a few weeks. We keep careful notes in the event the Federal Communications Commission becomes involved, and we use direction finding equipment to locate what we believe to be the source of the RFI.
Once we believe we have located a RFI source, we begin a very complete process of documentation. The first thing we do is to insure that the person making the RFI report is not unknowingly the source of the RFI. We will suggest removing power from his/her home, and then using a battery powered radio we listen to see if the RFI continues. If after the power is shut off, the RFI continues, it is a pretty good bet it is not coming from the reporters home. If on the other hand the RFI ceases when the power is shut off, then it is a pretty good bet the RFI source is contained within the reporting persons home. This insures that the reporting person is not the cause of the RFI, as happens in many cases.
Assuming the reporting person wants to continue, the next step is to place RF monitoring equipment at the location where RFI is being experienced. The computer/receiver work together to capture the signal for later analyses. The signal analysis helps in several ways later:
Helps ID the signal type
In some cases the device generating the RFI can be identified directly without entering a residence.
Once a suspected RFI location is found, we may mail a handout explaining that we believe an RFI issue may be present at that residence, or business. The handouts cover what RFI is, and some of the laws governing RFI generation, for:
Should the person living at a location wish, we will assist in indicating that their location may be causing RFI by providing an outside listening service. i.e. if the person removes the source, we will let you know if we still hear what we believe to be RFI. This is not a scientific test, but in most cases it locates the source quite easily. In some cases it is not correct, but most of the time it is. For legal reasons we will not provide filters, nor will we enter a residence under any circumstances. Nor do we represent this as an overall test for all types of RFI. It is incumbant on the resident to test for RFI, we are simply providing a free service which may not show all RFI.
We may contact the person living at a residence first, or we may contact the property owner of a residence first. We also may just send in a direct complaint to the Federal Communications Commission reporting a possible RFI violation, not contacting anyone. However, our goal is to solve the RFI problem at the local level if possible, but if necessary to escalate up to and including Federal Communications Commission involvement until the issue is resolved.
In most cases, the person creating the RFI is responsible. If for instance a person has an aquarium and the heater is generating RFI in excess of Federal Communications Commission limits, then the operator of the device is responsible for making sure that the device generating the RFI is operating within within Federal Communications Commission specifications as outlined in Part 15 and Part 18, of the Federal Communications Commissions rules.
See this recent enforcement letter from the Federal Communications Commission, sent to a person with horticultural lighting generating RFI.
The Federal Communications Commission (FCC) licenses radio transmission and reception stations in the United States. As part of that responsibility, the FCC is the regulatory agency charged with maintaining the licensed radio frequencies to be free of harmful interference, (RFI).
Such licensed frequencies include, but are not limited to those used by fire, police, cellular phone services, cable TV, amateur radio, as well as commercial radio and television broadcasting. Ultimately, it is the Federal Communications Commissions responsibility to take enforcement actions against those generating RFI that negatively impacts the authorized users of licensed radio frequencies.
More information about RFI can be found at the following links: