HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comments
View Comments: Newest First|Oldest First|Threaded View
<<  <  Page 3/3
Ratsky
User Rank
Platinum
Re: RF disturbances more scary then an nuisance?
Ratsky   11/23/2011 2:55:52 PM
NO RATINGS
I'd like to add some to the discussion on the biological effects of RF.  1.  Way back in the early '70s I worked at Motorola Comm division; next door to my lab was one run by Dr. Quiriano Balzano.  His expertise was (still is, I suppose) exactly that: biological effects of RF radiation.  At the time, he was doing extensive research in a very direct way (very un-PC now!).  He used lab rabbits, exposed to well-controlled RF fields over a wide range of frequencies VHF upwards) for long periods of time.  He found that the most sensitive indication of damage were the rabbits' eyes; they would develop cataracts after a sufficiently long exposure to a sufficiently high field strength.  He then measured the near-field strengths and spectra of the many types of hand-held equipment that Motorola manufactured and sold, and conducted a years-long study using several times the highest levels he measured.  NONE of the test rabbits ever suffered any ill effects; the resulting paper was published, reviewed, etc. and was generally accepted as valid.  No subsequent study has ever been conducted to that same level of detail and thorough ness!

2. There is a very large study group that has been voluntarily exposing themselves to RF field strengrths MUCH MUCH higher for MUCH MUCH longer than, for example cell phones (especially current technologies, which use very low transmitting power even in marginal areas).  I refer to the 1 million+ or so radio amateurs (I am a Life Member of both the ARRL and the IEEE) around the world.  While I am not aware of any organized scientific study of this group, from my personal observation I imagine hams are on average among the HEALTHIEST and longest-lived populations!  I am quite surprised no one has ever thought about doing that study; I suspect that far too many of the possible researchers have axes to grind that might be blunted by its results!

 

Rob Spiegel
User Rank
Blogger
Re: RFI on the Rise
Rob Spiegel   11/23/2011 2:47:56 PM
NO RATINGS
I would imagine there would be some negative impact from all of the RFI. But there doesn't seem to be. Can that just increase year-by-year without it having any impact of humans or devices?

Ann R. Thryft
User Rank
Blogger
Re: RFI on the Rise
Ann R. Thryft   11/23/2011 11:52:19 AM
NO RATINGS
The amount of RFI has definitely increased because there are so many more sources, both in terms of different kinds of wireless transmission technologies on various bands, such as WiFi and 4G networks, and in terms of point sources (millions of cell towers, millions of Blackberries and WiFi-equipped laptops) for each of these transmission technologies. Other, perhaps less obvious sources, include clock radios and halogen lamps.

Alexander Wolfe
User Rank
Blogger
RFI on the Rise
Alexander Wolfe   11/23/2011 7:59:43 AM
NO RATINGS
I would love to see a Sherlock or Monkeys which talks about something that took place in the 21st century. But I digress. My point here is that one can't help but notice that RFI has actually increased in recent years. My beloved Blackberry is among the biggest culprits. Who among us hasn't been on a conference call where asychronous (actually, often persistent) buzzing is disrupting the discussion. "Can everyone check if their Blackberry is near the phone?" is a common question on these calls. I don't know how designers can easily stanch this interference. It's not like you can put a choke on the antenna without killing the signal. Still, it's a serious problem.

Beth Stackpole
User Rank
Blogger
RF disturbances more scary then an nuisance?
Beth Stackpole   11/23/2011 6:42:32 AM
NO RATINGS
Good detective work, which unfortunately required a major effort on your part in terms of having to pick up and move. Forget about the inconvenience, the issue you raise about the effect of the RF disturbances on humans is really far more alarming. Glad you were able to clear out of dodge.

<<  <  Page 3/3


Partner Zone
Latest Analysis
2016 engineering grads can expect to earn an average salary of $65,000 right out of the gate. Petroleum engineers' wallets are much fatter, though -- they are expected to earn about $20K more.
3D printing is now adding value to manufacturers at all steps along the business value chain. Come find out how at a talk by John Jaddou at next month's Embedded Systems Conference in Minneapolis.
From IoT and M2M to flexible robotics and consumer HMI, the advances in smart manufacturing are being deployed on the packaging floor.
These new 3D-printing technologies and printers include some that are truly boundary-breaking: a sophisticated new sub-$10,000, 10-plus materials bioprinter, the first industrial-strength silicone 3D-printing service, and a clever twist on 3D printing and thermoforming for making high-quality realistic models.
Ear-based heart-rate monitoring gained momentum recently, as sensor maker Valencell Inc. announced it has licensed its biometric earpiece technology to Samsung Electronics Co. Ltd for use in so-called “hearable devices.”
More:Blogs|News
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Aug 8 - 12, Getting Hands On with Arduino Mechatronics
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7 | 8 | 9 | 10


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Technology Marketplace

Copyright © 2016 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service