Dear friends, Wow, that's depressing. Could someone give a quick tutorial about what is generating the RFI? I don't know much about grow lights. Is the noise mostly SMPS, LEDs, fluorescent bulbs, or
Dear friends, I am seeing RFI on 2m from the cathodic protection circuit in our geothermal heating system. The protective circuit's on-board SMPS generates a large broad emission around 150 MHz, veri
Dear Jim, I just installed some clip-ons (unknown ferrite mix) and they reduced the radiated emission by 30dB. I think that the last 10dB will take some more work. I'm curious what you mean by, "...
Dear friends, I have recently commissioned my 4-yagi 2m EME system. To my unhappy surprise, I find strong RFI in the direction of a large commercial broadcast tower 3.5 miles away. The noise is unifo
Dear Lloyd & others, I appreciate the several replies on and off-list. After building my EME system from scratch over the past seven years, I would prefer that the noise problem be something I can so
My question should be, "What does Ethernet EMI look like at VHF?" It might be different at HF. W9IP Dear Lloyd & others, I appreciate the several replies on and off-list. After building my EME system
Dear friends, I would appreciate recommendations for LED replacements for a couple of 500W halogen spotlights. They illuminate my 2m EME antenna and of course they must be RFI-quiet. Thanks W9IP ____
Dear Don - Could you post an image of what the interference looked like in the frequency domain? 73, W9IP Today I tracked down new RFI at my QTH on 160 meters. I was able to hear the RFI from my driv
Don Silly me, I didnt read all the way to the end of your post; didnt see the video link. Sorry. W9IP From: Don Kirk <wd8dsb@gmail.com> Sent: Thursday, November 17, 2022 8:35 AM To: nlsa@nlsa.com Cc:
Dear friends, A new source of interference popped up a few days ago. Its center frequency appears to be 143.950 MHz with sidebands every 200 kHz up and down the spectrum. It is intermittent but when
I keep forgetting that attached images aren't permitted. Here it is: https://www.nlsa.com/images/W9IP%20interference.jpg W9IP Dear friends, A new source of interference popped up a few days ago. Its
Dear friends, I have a question about the "off" state of PV arrays. If a solar array generates RFI when it is on, does it stop when the array is turned off? I suppose that the answer depends on sever
Dear Tony - Thank you for the pointer to your excellent videos. Regarding the optimizers... are they shut-down-able or do they always operate if the solar panels are illuminated? 73, W9IP Mike: I hav
Dear Michael, Thank you for your clear and specific reply to my question. I will investigate whether residual RFI continues when microinverters are shut down. Best regards, Michael, W9IP From: Michae
Dear friends, I have noticed something that puzzles me. When I turn ON a pair of AC fans, my VHF noise floor *drops.* Background: My EME station is remotely operated. Everything is mounted at the ant
Dear friends, A couple of members have replied off-list, both suggesting that the AC wiring or perhaps an imperfect ground connection might cause the odd noise behavior. The latter is a definite poss
Dear friends, Several people have mentioned on this reflector that SolarEdge was working on improvements to their equipment that would reduce RFI emissions. Does anyone have specific models or other
Kurt - You may be correct but we'll never know unless someone inside SolarEdge speaks out. Don't overlook the economic aspect. A solution to RFI might exist but it's more costly than SolarEdge wants
Dear friends, My remote 2m EME system is comprised of a number of modules (SDR, transverter, SSPA, plus antenna and ventilation control modules, etc.), all of which are linked to each other via a Net
Dear Jim - Thank you for your comments and suggestions. I neglected to mention in my original post that I had also replaced the Netgear switch's plastic AC power entry connector with a shielded and f