The problem is not halogen bulbs, but the switching power supplies now used instead of low voltage transformers. Lamp dimmers too are prolific interference sources. As for energy-saving screw-in fluo
The magnetic loop matter comes up every few years. FWIW, I get useful E-field loop "shielding" by simply shorting the local E-field with grounded wire next to one. Make it a tube and you have the shi
Lucklily, the November Monitoring Times Digital Digest column is titled "What's That Sound?" and includes just what we need. Check out the link they provide to Leif Dehio, who has "...recorded and cl
Power supplies face no FCC Part 15 radiated RF tests below 30 MHz. There IS a conducted emissions test. QUOTE Section 15.107 Conducted limits. (a) Except for Class A digital devices, for equipment th
I see from the UL site they are made by PILOT INTERNATIONAL LTD E185630 ROOM 1708-09, 17/FL TOWER A, REGENT CENTRE 63 WO YI HOP RD KWAI CHUNG, NT HONG KONG and they have a valid UL listing (http://ti
I spent some (don't look now, boss) using the high-speed system at work looking on the FCC Web site for form 740's (required to import RF-producing items) indicating verification was performed. I did
An acute observation, and thanks, too for diving into the UL site. "Factory assembled", eh? The thot plickens! Cortland KA5S (long,somewhat OT) a <http://www.hrelampparts.com/files/Cat/HRE/Ballast_Tr
Well. as already noted, for small items you may not get a label. It is possible to have Part 15 information an instruction sheet, for example. I will add also that for Verification, there wil be no F
Probably the nature of the beast. ADSL uses spectrum up to 1.1 MHz and ADSL2 up to 2.2 MHz. At maximum reach there is only about a few uV difference between bits in the digital signal ,and this makes
Don, k4kyv, asks VR-500 or Icom IC-R series? sniffing purposes. VR-500 would be a better deal capability, and tunes in 5 kHz Pretty well, actually. I have used several different ones to sniff interfe
Good evening, Billy. More information is almost always better than less. Does the interference start when you connect the audio between a computer and the radio set? If so, it may be curable by addin
Hi Frank, The wireless part'll be clear, but if the base units you get are susceptible to RF on telephone and power lines, you may still have problems. If it were I (grin), I'd first clean up problem
Hello, Eduardo. A filter on your transmitter will help if your transmitter is sending RF on television frequencies. It will not help if the TV set is responding to your frequency when it is not tuned
I found an RF-proof 'phone at the Marshall (MI) hamfest; it's an old Bell 500 type. The idea is if a neighbor complains I'm "interfering" with his telephone I can say "My phone doesn't hear anything!
Recently I spent time at work looking for a PS to use inside an EMI chamber. None of the ones on hand (nclude some older Sorensons) were RF-quiet. Just because a PS is "linear" does not make it clean
Lin, That falls under Part 15. 15.209 says 200 microvolts per meter at 3 meters, so it's pretty loud. A Part 15 user is responsible for stopping interference to a licensed one, of course. That's no h
Hi again, Dale, Nice to see you in Cedar Rapids. No, these really are low power, so should not be a problem for weak signal work. I understand there is at least one ATV repeater whose audio has probl
Hi Dave! Comments interspersed below. HTML to preserve formatting. Comment: Yes, IIRC, that's a European ISM frequency. Also in that range are Euro PCM radios, which show up here when tourists bring
Sometimes it helps to remember that "ground" is just a low impedance at all the frequencies we want to divert current -- and a sink that has no bad effects when we do. Glen Dash used to recommend a h
Terry, just a thought but if you are using a "cable box", are the TV's connected to it set on Channel 2? Cortland, KA5S other words, not the antenna _______________________________________________ RF