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pierredv : rf-noise   23

FCC Fines Maker of Light Fixtures. Really. | CommLawBlog, Nov 2017
The FCC proposed a fine of $25,000 against a manufacturer of fluorescent lighting fixtures.
CommLawBlog  RF-noise  enforcement  Enforcement-Bureau 
december 2017 by pierredv
Noise generation and connected car testing - RCR Wireless News, Apr 2017
This increase in the RF noise level for vehicles can potentially have an impact on vehicle systems, according to Jeff Warra, business development engineer with test company Spirent Communications‘ automotive segment. Particularly as auto makers move to automotive Ethernet, with unshielded twisted pair wiring for control area network communications within the vehicle, the increase in speed and change to the physical interface can mean that systems are more vulnerable to external or internal noise being induced into vehicle systems. Warra said Spirent has developed a noise generator that is able to produce typical automotive noise – the internal combustion engine, the horn being sounded, windows rolling up and down, as well as intermittent sources such as driving under high-voltage power lines – to check automotive Ethernet implementations and the robustness of the overall vehicle system. The noise generator’s range is up to about 600 MHz, Warra said, and Spirent has a noise injector for use up to 212 MHz – not high-frequency noise or particularly high-power noise, but still a potential source of interference.
automobile  noise  RF-noise  RCRWireless 
april 2017 by pierredv
[26]  Liaison statement to Working Parties 1C, 3L, 5A, 5B, 5C, 6A, 7A and 7D - Assessment of the impact of unwanted radio frequency energy generated by non-radiocommunication equipment to radiocommunication services (Questions ITU-R 221-2/1 and ITU-R 236
“Many types of electrical and electronic equipment are seen to be involved, particularly those using switch mode power supplies and power conversion stages… particular problems associated with LED lighting and increasing noise levels … In addition there are continuing concerns and emerging reports of interference from high performance broadband/CATV distribution systems…”
ITU-R  WP7  noise  RF-noise 
april 2017 by pierredv
Police Baffled? Send For The Radio Amateurs! | Hackaday Aug 2016
"Eventually they approached the ARRL, the USA’s national amateur radio organisation, who sent along [Kermit Carlson, W9XA] to investigate. He fairly quickly identified the frequencies with the strongest interference and the likely spot from which it originated, and after some investigation it was traced to a recently replaced neon sign power supply."
Interference  RF-noise  public-safety  ARRL 
august 2016 by pierredv
summary of "Comments were filed by yesterday's deadline in ET docket 16-191 in response to a public notice released in June by the FCC's Office of Engineering and Technology. The public notice announced that the FCC's Technological Advisory Council plans to conduct a noise-floor technical inquiry."
WestLaw  FCC  noise-floor  RF-noise  TAC 
august 2016 by pierredv
AT&T: industrial lighting, FM stations causing interference with low-band wireless services | FierceWireless
"AT&T said that its wireless network is suffering from interference generated by a range of electronics operations, including large scale video displays, industrial lighting systems, LED lights and FM radio stations."
“Lighting systems, including CFL ballasts and LEDs, such as those used in sports scoreboards, billboards, and other large scale video displays, can wreak havoc with uplink signals to nearby cell sites operating in the Lower 700 MHz and 850 MHz Cellular services and will likely impact soon-to-be- auctioned 600 MHz spectrum,” AT&T said in a filing to the FCC
FierceWireless  AT&T  noise  RF-noise  lighting  FM  Verizon  FCC 
august 2016 by pierredv
Combatting AM (And SW) Interference | radiojayallen
"You can find many technical and semi-technical articles about RFI but the aim of this article is to distill all that information down to some very specific things you can actually do to improve your AM radio reception."
Interference  AM  noise  RF-noise 
june 2016 by pierredv
SBE Urges FCC to Improve Medium-Wave Noise Environment - Mar 2016
"The Society of Broadcast Engineers (SBE) has told the FCC that the regulatory agency needs to take another tack in its efforts to tackle AM revitalization. If the FCC takes the SBE’s advice, the result could be less noise in the MF and HF Amateur Radio bands. "
"As a start, the SBE suggested, the FCC might consider establishing limits on the amount of noise that Part 15 unintentional radiators, such as plasma televisions, can radiate directly. Only conducted emission limits now exist."
RF-noise  ARRL  SBE  FCC  AM-band 
march 2016 by pierredv
The Future of AM Radio | Communiqué Feb 2016
via Dale "AM radio has been in decline for years, with many AM stations going out of business each year. Now there are only 4,684 left as of the end of 2015. That stands in contrast to the 6,701 commercial FM stations that are thriving, a number that does not include an additional 4,095 educational FM stations and 1,433 low power stations. All this is still analog, remember. So some big questions come to mind: Why is AM dying, and what can be done to save it?" " The AM band is very noisy, with interference from power lines, auto ignition, fluorescent lights, motors, CLFs, and any electronic equipment with switch-mode power supplies, which includes almost every product today. "
AM  spectrum  RF-noise  noise 
march 2016 by pierredv
Big Name Car Owners Want Their AM Radio Back - interference technology Feb 2016
"BMWBlog, Motherboard, TeslaForum, and others are reporting severe customer blowback regarding the decision by BMW and Tesla to remove or disable the AM radio function in the BMW i3 and Tesla Model X vehicles. The Tesla Model S is also affected. The reason is that EMI noise from drive motors and associated electronics is creating sufficient interference in reception that it renders the AM broadcast band useless."
AM  interference  automobile  Tesla  BMW  RF-noise 
february 2016 by pierredv
Electronic Noise Is Drowning Out the Internet of Things - IEEE Spectrum Sep 2015
"Our increasingly connected world needs better protection against RF noise pollution"
RF-noise  noise-floor  IEEE-Spectrum 
september 2015 by pierredv
Energy-efficient Electric Car: No AM Radio Due to Possible EMI - July 2015
The BMW i3 Electric Car was the most energy-efficient car sold in the U.S. this year, according to Green Car Reports. However, consumers noticed the car does not offer AM Radio. “AM is not offered due to negative performance influences of the electromagnetic interference of the electric drivetrain. Electric motors cause interference on AM which is why BMW decided to remove this option. While it could be offered, BMW’s performance standards are very high and we don’t offer a product that meets less than those high standards,” Rebecca K. Kiehne, a BMW spokesperson, said.
AM  interference  RF-noise 
july 2015 by pierredv
Home Depot's marketing of RF lighting devices rankles amateur radio group - FierceWirelessTech
"The American Radio Relay League (ARRL), the national association for amateur radio, filed a formal complaint with the FCC, alleging that the Home Depot chain has been illegally marketing certain RF-ballast lighting devices to consumers in violation of FCC Part 18 rules."
HomeDepot  ARRL  interference  RF-noise  RF-ballast  lighting  fluorescents  AM 
july 2015 by pierredv
Ofcom | Notice of proposals to make The Wireless Telegraphy (Control of Interference from Apparatus) Regulations 2015 - Jan 2015
sounds like Ofcom is giving itself more flexibility to deal with noise floor issues, particularly once equipment has started operating (see sections 4.4 ff. in the pdf)
Ofcom  interference  RF-noise  noise-floor 
january 2015 by pierredv
Saving the AM Band – Why RF Noise Abatement Is So Important - Lawrence Behr, LBA Group
The electric power grid has expanded, bringing its own noise contributions from corona, arcing, and other modes. . . . The severity of interference is variable. . . . In one power line field investigation by LBA’s Chris Horne, the signal of a 50,000 watt radio station was found to be unusable only four miles from the transmitter on a car radio. . . It is the opinion of many radio engineers, including those at LBA Group that the increase in power transmission and distribution line construction by utility companies and lack of focused attention to transmission line noise has elevated the AM band issues in many geographic areas. Further, that noise from PCs and devices that use microprocessors or microcontrollers must be addressed from an FCC Rules Part 15 and Part 18 incidental interference certification and auditing strategy. . . . Compact fluorescent lights and some LEDs are a growing problem which requires strong and uniform radiated emission standards.
AM  interference  RF-noise  noise-floor  electrical-powerline-interfence  DRM  fluorescents  LBA 
december 2014 by pierredv
Lost in migration - YouTube - Nature video
Seems to be AM signals "Electromagnetic noise is emitted everywhere humans use devices. For decades, people have wondered whether this noise is affecting birds' ability to sense the Earth's magnetic field. Migrating birds use their magnetic-sensing compass to help them fly in the right direction. "Now, researchers at the University of Oldenburg in Germany have shown that radio waves affect European robins. Only when the robins are put inside huts that screen out the man-made electromagnetic noise can they position themselves in the right direction. "
video  birds  migration  RF-noise  NatureJournal 
may 2014 by pierredv
TVTechnology: What You Need to Know About Adjacent Channel Interference - June 2012
"This test result is the first of many planned. f ATSC signals may prove to be practical. If so, we can realize 100 percent spectrum efficiency as ATSC signals can occupy contiguous channels if all transmitters are co-sited."
Charlie-Rhodes  noise-floor  RF-noise  TVTechnology  ACI  DTV  interference  TV  noise 
july 2013 by pierredv

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