There are two very common ferrites in 'EMI' beads, one optimized for 100 MHz or so, and the other for around 300 MHz. The sellers may not know (or even care) which mixture they're selling, so testing
I hope these cautions are NOT seen as "dragging a newcomer across the coals." I certainly didn't have that in mind! Cortoand KA5S for lack _______________________________________________ RFI mailing
http://www.fcc.gov/eb/Orders/2005/FCC-04-297A1.html excerpt: 1. In this Memorandum Opinion and Order (``Order''), we deny a petition for reconsideration filed by A-O Broadcasting Corporation (``A-O''
Reading the document in the URL I see the station claims it is unable to pay due to being 1) a startup, 2) off the air, 3) has no revenue and )4 has only one stockholder. The commission was skeptical
Bud, I believe it. A cellular telephone has enough power to upset a number of devices if placed next to them or on them. Want to try with a defibrillator? No? I don't blame you -- grin! Modulation ty
Back around 1992 or so I saw what looked like a rocket or mortar shell fireball in Burleson, TX. It turned out to be a pole transformer shorting out and all the oil igniting at once. Someone had left
Van, These are good tools for sniffing. I prefer one that picks up little through the case and more via the antenna, as this makes for more accurate probing around, and even DF'ing. Cortland KA5S num
Some 20 years ago I had occassion to track down widespread interference caused by medium-voltage power-line-related arcing. I found HF DF of limited use due to RF conducted along powerlines and other
The FT -etc. numbers are from Amidon. Fair Rite uses the first two numbers for product line and the next two for core material. I have found four inch OD 31 material toroids on sale at flea markets.
Stephanie WX3K asked products so the customer sees this ? to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference receive
The Part 15 labelling on Amateur transceivers is required because receivers covering 30-960 MHz must comply with provisions of Part 15 adn no other label is provided. The notice does not apply to the
It's their warranty; manufacturers can and do -- Porsche is one, if I recall correctly -- forbid use of ANY after market electronics. However, US manufacturers have in the past not been quite so rest
Automotive electronics are not required to conform to the emissions limits of Part 15: [SNIP] Section 15.103 Exempted devices. The following devices are subject only to the general conditions of oper
Sean, You are on the right track and in the right place. Check out http://www.arrl.org/tis/info/HTML/catvi/catvi-leakage.html Note this from that page (excerpt): "Contact the local cable system, and
Kelly, you might ask if they've recently replaced their daughter's light with with a dimmer type, or added a wireless remote switch. These are sometimes affected by RF. Cortland KA5S ________________
Kirb, I don't know the specifically Canadian regulations and had to look them up. Industry Canada has some tips. See http://strategis.ic.gc.ca/epic/internet/insmt-gst.nsf/en/sf05473e.html Unfortunate
Frank, it's not universal. I sure don't have it HERE. Grab a handheld with HF and track it down. Probably a switching power supply, possibly one that runs your building's master antenna, outdoor ligh
Dunno why I didn't think of Ethernet. I am glad now that I turned down DSL service! If your entire apartment complex is wired for DSL, you are surrounded by these Ethernet sources. If you are lucky,
Yes, it is ticklish. However, the interference *acts* like one source at the antenna terminals. If the sense antenna or pickup (current transformer on the AC? Outlet cover screw?) sums interference s