Author: Henry Pfizenmayer via RFI <rfi@contesting.com>
Date: Sun, 25 Dec 2022 12:09:09 -0800
Mike et al --If that was not tongue in cheek as they say -- this last summer I started getting thumps of noise on 6 meters -and was far worse at 25 mhz -- Then I noticed it was in sync with neighbors
It likely was a Class-E amp (or worse). They can be dirty as $%^& when stressed (by the strong bass notes). I once tested a Class-E home automation system with all kinds of Class-E amps (for intercom
The one i have experience was a Class D amp intended to be wall mounted and connected to with bluetooth. A ham with a very sensitive setup was hearing it 1700 feet away. Yikes! Now, here's the intere
Never rule out power supply. Virtually all are some form of SMPS or DC-DC converter. Several years ago, W6GJB traced noise to USB-powered speakers, which included DC-DC converters. 73, Jim K9YC _____
On 12/25/2022 1:14 PM, Hare, Ed, W1RFI wrote: My test fixture was a simple ceramic socket, placed in a C63.4 compliant room. I then purchased on of the "cans" that most spotlight bulbs are installed
Thanks for relating, Ed. And you (et.al) should wonder why I see a crying need to revisit limits, measurement philosophies, and even C63.4. But it won't happen in my lifetime as I just turned 76 (pra
The only way to test a solar system is on an OATS, although the chambers at GM in Detroit would probably be big enough. The interference reports we are seeing are all on HF, unless we have a smatteri
I believe CKC lab (if I remember correctly) near Yosmite has facilities (OATS) with large turntables which can and do accommodate complete rail cars. But Detroit is closer to you. Road trip to a beau
Did you by chance transmit on that frequency, while the thing was on? :) 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist, RFI ARRL Asst. Director, N
24.998 MHz would have done just as well. I have a funny story about that sort of thing. A few years back, I was doing a lot of HF mobile work on CW. One day, I went way to the back of a parking lot t
Ed, et al, Thanks for these Christmas "presents"! 73, J. Gordon "Gordie" Beattie, Jr., W2TTT 201.314.6964 W2TTT@ATT.NET Gordon.BeattieJr@VIAVISolutions.com Get On The Air! 24.998 MHz would have done
I so wish the local grow lights worked that way... :) 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist, RFI ARRL Asst. Director, NW Division, Technic
Dave, Mess with grow light operators and you stand an even better chance of being shot than messing with the guy with the steroidal car stereo! 73, J. Gordon "Gordie" Beattie, Jr., W2TTT 201.314.6964
That sir, is a very valid concern... Here is a short story about a grower two blocks from my home, causing RFI... Myself and another ham located a major RFI source in my, and his neighborhood. This f
Dave, Good grief! What an idiot! I live on 18+ acres of mostly open land with mostly open land on adjacent properties and I exercise GREAT CARE when target shooting. Home invasion is handled with a p
My point exactly, he is not thinking correctly, and in some cases we, as Amateurs, are forced to deal with them... I just assume everyone is crazy now... :) 73, and thanks, Dave (NK7Z) https://www.nk