120 Hz is also a strong component of electronic noise generated by power supplies and power control equipment. The audio spectrum is not a great clue -- the RF/IF waterfall shows where the bodies are
When I bought some LED fixtures for the kitchen a few years ago, I connected a power cord to them at home and tested them for RFI before installing them. All were OK. One of my neighbors unwittingly
The broadband noise source with the 1.1 kHz AM audio component turned out to be an aquarium heater controller at an immediate neighbor's house. It was raising the broadband noise floor on 20m by abou
I saw/heard something like that, with spacing of about 10 kHz. I had the same thought about it being local. 73, Scott K9MA 73, Pete N4ZR On 3/6/2023 10:47 AM, nm8rmedic via RFI wrote: IARU Intruder W
My next door neighbors installed an Enphase system last year. I had the installer put ferrite cores on the wiring. The system is about 20 meters from my tower. I've detected no RFI from it. Whether t
I, too, have found my Cyberpower UPS to be RF quiet, even when it's running the radio on the battery. It also generates a clean sine wave at a reasonable cost. 73, Scott K9MA On 6/12/2023 6:28 PM, Da
It's really hard to tell whether RFI you see with a probe like that is going to be an issue. They're most useful when you DO have an issue, and you're trying to track down the source. FWIW, I have a
And, when you do the full power off test, be sure to shut down all the UPS's! 73, Scott K9MA When I assist someone, I insist on doing a full power off of the home first... You would be surprised at
I recently rebuilt my whole station. Among other things, I neatened up all the wires and cables. Naturally, this resulted in a bunch of new RFI problems. The latest is a malfunctioning usb keyboard.
For what it's worth, I wired my whole house with unshielded CAT 6 cable, before the shielded stuff and connectors were available. While I do have a bunch of ferrite on the cables at the router, etc.,
Not necessarily. I'm on my second Bryant/Carrier one, and neither has had any RFI issues at all, in either direction. 73, Scott K9MA -- Scott K9MA k9ma@sdellington.us ________________________________
It may not even be a failed component, as any two pieces of poorly bonded hardware can produce noise. That could explain the temperature dependence. In any case, have them check all the hardware on t
The only time I've had any success is when I've personally been there with a receiver. Usually, as soon as the lineman touches the offending hardware, I can hear it. In one case, I could hear it fluc
An almost giveaway symptom for this type of failure is erratic behavior of the RFI in a good gusty wind. True. It is possible to simulate that gusty wind, but power companies frown on that. 73, Scot
I recall, about that time, trying to get my local utility to find a line noise problem. After the got a call from the FCC (!), when we went out on our evening noise tracking trip, we found power pole
On 2/18/2024 8:45 PM, Pete Smith N4ZR wrote: I have about 8 USB cables in my station, two going directly to my computer and 6 to a hub. I suspect some RFI because periodicallyevery couple of hours -
On 2/20/2024 11:09 PM, Jim Brown wrote: On 2/20/2024 6:12 PM, K9MA wrote: One problem I can see with several cables through one core is that the currents in the wires may be out of phase, rather that
On 2/21/2024 10:03 AM, Pete Smith N4ZR wrote: I have a persistent problem with my computer (and N1MM Logger) shutting down every couple of hours when I'm active on the air, requiring a computer resta
Nothing heard in WI, EN53 at 1933Z. The fact that you apparently hear it day and night suggests it is local. 73, Scott K9MA The signal strength right now is S-9. My time here is now 1925Z. I hear it
Be sure to turn off any UPS you have. 73, Scott K9MA -- Scott K9MA k9ma@sdellington.us _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/