All of this is great info. If whoever wrote the majority of this wants to rework it to include all useful suggestions, I can add it to the ARRL pages on power-line noise. I may edit it to include som
Mike Martin's course very specifically points out that one should do exactly what I suggest, Jim. A very strong source, even on UHF, will be heard when you point your directional antenna towards the
What I have seen is that noise that gets conducted onto 120- or 240-volt wiring differentially tends to diminish very rapidly with distance, even on HF. Noise that is conducted onto ac mains in the c
<So let me get this straight. If hams make false complaints then the utility is ok to blow us off.> I never said it was okay, so i am not sure how you got that out of my words. What I did say is that
Ultrasonic detectors are tricky. They can confirm a noise source, but they are prone to false positives from corona discharge, which generally does not cause interference. They can also give false ne
Most of the text was written by ARRL staff, subject to many, many hours of arguing about the placement of hyphens. Ed This is very nice to hear Ed ! Thank you for your effort in this. Sounds like thi
Oh, yes, this was very much a collaboration. Many of "my" words started it, but the utility guys on that committee added exceptional value and the end result will be just what is needed. Ed ...as wel
If we can, let's expand this a bit. One thing I have to tell members often is that ARRL really doesn't know which systems of all types may be RFI-quiet because hams don't ever call to tell us that a
The ARRL has only been saying for 20 years that grounding is not a cure-all for RFI problems... --Original Message-- From: RFI <rfi-bounces+w1rfi=arrl.org@contesting.com> On Behalf Of David Eckhardt
Intermod would be covered by FCC rules, but whether it would be picked up in measurements would depend on how the measurements were made and where the intermod was occurring. There are three likely p
< Doesn't appear the ARRL is doing much either.> ARRL staff are heavily involved in EMC at a number of levels. o I serve in the IEEE EMC Society Board of Directors as its elected Vice President for S
The majority of RFI cases ARRL receives about AM-broadcast intermod and even harmonics are at least made worse due to receiver overload. It is important to try 10 or 20 dB of attenuation for the rece
Gordon is a good engineer who has made valuable contributions, but the thing that makes him the most "special" is that he saw that he could make a contribution and stepped forward to do it. His work
Keep in mind that a broadcaster is not legally responsible for intermodulation that is not occurring in its transmitter or in nearby equipment it owns and operates. If a "rusty bolt" on nearby electr
It is correct that the FCC has no regulations specific to the solar industry. We really don't want them to write any, because FCC has a propensity to relaxing regulations. In Part 15, for example, th
<Since electric power company's power generation, transmission and distribution systems all fall under Part 15 Incidental Radiator regulations, wouldn't the same thing to apply to an electric power s
Actually, there are rules that govern solar and so far, only Solar Edge, General and LG have generated complaints to ARRL and/or FCC. Ed, W1RFI --Original Message-- From: RFI <rfi-bounces+w1rfi=arrl.
Sure, David, I will chime in. You are wrong. The exemptions in Sec 15.103 talk about utility equipment, but any device installed in subscriber premises is not exempt. Solar systems are Part 15 uninte
Solar systems are not appliances. Here are some excerpts from the rules: 15.103 Exempted devices. The following devices are subject only to the general conditions of operation in §§ 15.5<https://www.
David, Solar systems are digital devices that are classified as unintentional emitters. If they are marketed into residential environments, they must meet Part 15 B emissions limits. The only uninten