Hi Paul, First, let's call a spade a spade -- it's not a "balun" or even a "current balun," it's a common mode choke. What we CALL it helps us understand what it is and what it does. See more commen
Can you provide a link we can use to describe this to people? Thanks. Ed Last I saw a couple years ago, you fill out an online complaint form with the FCC, the offender is "red-flagged" in the comput
From antenna modeling I have done, the decay of noise with distance depends on how the noise is being coupled on to conductors and how imbalanced those conductors are. If noise is coupled onto wires
< Not everything in it is right, but most of it is.> I had a nasty (still unresolved) fight with a neighbor several years ago over his solar panels, batteries, and inverter system. I got the FCC invo
This surfaced during the actual BPL days, with a company called Corridor Technology, if I recall the name correctly. It never really went anywhere. How this will work when the propagating wave hits t
<Does the searcher have an open mind?> I can't begin to say how important this is. ARRL staff hear all the time from hams about utility "investigations" in which the utility investigator did not set
I would be very hesitant to use a published list of quiet bulbs. Many of the big box stores are constantly buying new products from new suppliers, sometimes keeping the same model numbers, but with e
As RF lighting devices, they fall under Part 18 of the rules. These are somewhat lower than Part 15. Neither Part 15 nor Part 18 levels are sufficient to protect against all interference, and in some
I am not sure that I'd characterize the FCC as "actively seeking complaints." In our experience, they are not looking to take on any more work. The interference report form is more of an information
Thanks, Tony. Yes, the League staff really, really want those reports, not only to often provide some one-on-one help, but to identify problem areas, problem manufacturers and to give us a good reaso
Noise cancellers can be 30 to 50 dB effective against a single source of noise. They work by positioning a sense antenna that will pick up more noise than signal and combining that out of phase with
There are three problems with the use of ultrasonic dishes: 1. They give false negatives. If an arc were taking place on the top of an insulator, its ultrasonic noise would be blocked in the directio
That system would be a Class A Part-15 device, so would have to meet the higher industrial limits. Locally, ie near the motors, controller or wiring, I could well imagine a 50+ dB increase in noise f
True, Cortland. I would take the position that if they are switching synchronously, they are a system and as such need to be tested as a system. Having said that, we need to keep in mind that these a
Actually, testing BPL was easy. For access BPL, ie, on overhead power lines, the rules said to crank it to the maximum power, then report what power setting was needed to achieve compliance. In pract
Most of the systems I know of are adjusting the transmit frequency for maximum power transfer. This is somewhat dynamic, so the fundamental signal of these devices tends to wander a few kHz, making t
These are characteristics that typically identify a switch-mode power supply. 1. The noise is not uniform across an amateur band, but has peaks that occur every N kHz, with N typically being between
For most of us, our email addresses are public anyway. If you all google your email address, most of you will find it. They can get email addresses by buying them, by searching for them or even by ma
In general terms, those that can exert control over a system are the operators. This could include things like the ability to turn it off if interference occurs or even would probably be extended in
We have found Solar Edge to be receptive and interested in resolving the problems from their existing design. Keep in mind that the device is an unintentional emitter and as such, subject to conducte