For all, I would strongly recommend the following reference: *Transmission Line Transformers* By: Jerry Sevick, W2FMI ISBN: 0-87259-046-1 Amaxon like has it. Dave - WØLEV -- *Dave - WØLEV* *Just Let
Electronic 'mosquitoes' (RFI producers) make wonderful objects for target practice.... Dave - WØLEV -- *Dave - WØLEV* *Just Let Darwin Work* *Just Think* _____________________________________________
If I had to make a somewhat cynical comment, I'll bet the contract manufacturer eliminated the "simple line filter" to cut costs. After all, the line filter adds cost and does not contribute to the p
I've seen and witnessed it many.....many times with SMPSs from China over the last 15 years or so. It happens more than you might imagine. One year of testing as a consultant, I had to send 100% of t
Gary, you are fortunate! ALL of the CM's I've worked with take free reign on removing "useless" components and making substitutions where cost can be reduced. Their prime job is to take a design and
Doesn't look too good! TOP TRACES: I believe the impulsive increase in baseline most obvious in the top trace is due to normal sferics (lightning in the hemisphere). This is quite normal. BOTTOM TRAC
We had an interesting instance in Loveland, Colorado: Lots of interference typical of a grow operation. We went to the neighborhood with receiver and a small loop coupled to an AirSpy SDR. About 20-m
If you're a ham and care about HF, just say no to any and all SMPS's!!!! ! ! They are everywhere. And Part 15 was supposed to prevent this happening. Yea, sure,........ that's when FCC still cared! R
Yes, Ed, we've seen plenty on the Justice Channel! Even the neighborhood was right for a large grow operation. The interference has not come back to this day. Dave - WØLEV -- *Dave - WØLEV* *Just Let
Home appliances are specifically EXCLUDED from radiated and conducted emissions by FCC rules. Dave - WØLEV -- *Dave - WØLEV* *Just Let Darwin Work* *Just Think* ______________________________________
Here it is, specifically Part 15.103 (d) - I copied ALL of the exemption under this part and subpart: §15.103 Exempted devices. The following devices are subject only to the general conditions of ope
Totally agree, Paul. The appliance lobby must be at least as strong as the energy (petroindustries) lobbies. Our Maytag washer/dryer interfers with my radio astronomy efforts on 20.1 MHz, but at leas
I've run into a disgusting fact over my years as an EMC/RFI engineer: the lighting industry, in general, is unaware of FCC rules addressing radiated and conducted emissions from lighting. If we attem
In general, the average guy on the street believes FCC has all to do with radio and television, licensing intentional radiators (like us amateurs), and managing the RF spectrum (although, that last i
I looked up the installation manual for this LG model. All it cointains is a common mode choke. Nothing else. At least that's present. Dave - WØLEV -- *Dave - WØLEV* *Just Let Darwin Work* *Just Thin
The radiated and conducted limits are really pretty strong signals if received on an amateur transceiver. Worse, yet, the industrial limits are 10 dB greater than those for home and small office (Cla
We have the industrial line from Maytag, both washer and dryer. Both produce RFI. However, remember that the duty cycle is quite low if you don't have kids. We run them typically once a week and, yes
........ WITH LOVE, FROM CHINA ...... Dave - WØLEV PS: So far, I've/we have had good luck with Amazon, but we've always bought reputable brands - no Chinese brands or rebranded Chinese brands. -- *Da
One can not be 100% sure of rebranding. But if unreal claims are made, and/or descriptions have missing or misplaced articles of speach (the, a, those,....), or English write-ups that just don't soun
The Radio Jove receiver came with a 12 vdc wall wart from Jameco. I've had no problems with it and it is regulated. Try Jameco, as suggested. Dave - WØLEV -- *Dave - WØLEV* *Just Let Darwin Work* *Ju