Popping corn by cell phone radiation is clearly, and fortunately, not
possible. Besides, the antennas are pointed the wrong way for maximum
radiation into the kernels !
CNN broadcast a story about the video yesterday. It is available on the web at
http://tinyurl.com/5h8p3z
if anyone is
I believe that this sort of age specificity, even if cloaked in graduation
year, is illegal in the United States.
Not that it doesn't go on all the time, but it is illegal, and in my opinion,
wrong.
Some years ago there was a flap with IEEE Spectrum running ads that asked for
(for example) 2-8
List members:
Apologies for this limited scope message.
There is interest from several members in the Rochester, New York area in
forming a Rochester Chapter of the IEEE EMC Society.
I have also been contacted by a Kodak safety engineer who will be joining the
new IEEE Product Safety
The IEEE Product Safety Engineering Society has an interesting clause in their
By-Laws regarding the payment of dues:
8.1 Society annual assessment of fees
The annual Society fee shall be determined by action of the Board of
Directors. Failure of a Society member to pay the
Richard:
Generating a second harmonic is easier, using a push-push diode doubler. MCL
(Mini-Circuits Lab) should have some available at reasonable cost, but I
didn't check their catalog. You could also build one yourself if you have
the parts and facility. I know this doesn't get 10 GHz., but it
Chris:
You are dealing with hazardous area designations. I've dealt with these on
past products, and here is my best recollection:
Zone 2 probably refers to an area classification where flammable material
may be present abnormally (i.e., not normally present).
Class I, Div 2 refers to an
Charles:
When I was doing compliance for an employer, I always used my name, as
Director of Regulatory Compliance. That way, any FCC correspondence would come
to me instead of being lost on the desk of some executive who was clueless as
to what the correspondence meant.
Regards,
Jacob Z.
A curious point:
I noticed that the correspondence on this topic has all avoided using a name
for the # key. That's a good thing too, because it has different names in
various countries.
In the US, we tend to hear it called pound sign. That is clearly
ridiculous to the British, who bloody well
On the issue of broadcast field strengths, I can provide some input based on
a TV/FM field strength study I completed last December for a local
municipality.
The Town of Brighton and the City of Rochester New York are somewhat unique
in having the main broadcast tower cluster located on a hill
Jeffrey:
Not West Coast, but worth considering. This was retrieved from my files, I
haven't had contact with them for a few years though.
Comprehensive Language Center
4200 Wilson Blvd
Suite 950
Arlington, VA 22203-1800
(800) 634-5764
Richard Lytle - Dir. of Sales x 709
Regards,
Jacob Z.
Chris:
I hadn't been following the thread, so I apologize if this is duplicative.
A book that I picked up at the IEE headquarters in London a few years ago
cover a lot of ground in the safety and explosive atmospheres areas. It is:
Adams, J. Maxwell, Electrical Safety - a guide to the causes
John:
The way I have been pronouncing DOCOPOCOSS, it almost rhymes with HOCUS
POCUS, which I judge is more ironical than poetical (sic).
Regards,
Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618
Tel: 585 442 3909
Fax: 585 442 2182
j.schan...@ieee.org
- Original Message -
Bill is corrrect, of course, in pointing out this potential source of
confusion. Perhaps it explains why the UK has a hard time matching US
expenditures - they have to spend 1000 times more to match US billion for
billion.
Actually, I often hear Europeans use the term thousand million to mean
Back in March 2000, I wrote the following piece for The Rochester Engineer
magazine. I think it fits in nicely with the current Definition ? thread
contrasting English English with American English.
Regards,
Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618
Tel: 585 442 3909
Fax: 585
I would also like to recommend Pike Fischer for their FCC information on
CD-ROM. When there is a lot of money riding on a product - and there always is
- the few hundred dollars for a subscription should not be an issue - although
it usually is.
The GPO books are up to 18 months out of date.
Gregg:
Is your client in the UK? If so, what's he doing with a US answering
machine? Isn't it illegal to connect US equipment to the BT system?
I'm amazed that UK consumer law goes so far as to outlaw answering
machines losing messages. Geez. Are VCRs whose clocks lose time during a
brownout
Charles:
Maybe I'm missing something, but doesn't Part 15.101(b) which reads:
(b) Only those receivers that operate (tune) within the frequency range of
30-960 MHz and CB receivers are subject to the authorizations shown in
paragraph (a) of this section. However, receivers indicated as being
David:
The current edition is the 7th edition. It can be purchased from the IEEE at
www.ieee.org
The ISBN is ISBN 0-7381-2601-2 (if you want to order it from a bookseller)
or IEEE number SP1122-TBR.
It may be that larger university libraries may have it in their collection,
if you just want to
Jim:
I also could not find anything when I researched this a few years ago.
However, I took a look at a GFI duplex outlet in my home. The words on the
Test and Reset buttons are rightside up only when the ground pin is at the
bottom. This is also how all outlets in my home are installed.
Cortland:
From here on the border of Canada, (meaning, how would I know?) I'm guessing
that interrupt is the US Southern pronunciation of interpret as in
in-ter-pit and was (mis)spelled accordingly. :)
Jack
Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618
Phone: 585 442 3909
Fax:
Andrew:
One could theorize that the better growth had nothing to do with RF, but
with the tower not competing with the surrounding trees for nutrients. Did
New Scientist make any cause and effect comments?
I wonder what the EMC-PSTC group thinks of this issue - should there be
concern for
Muriel:
I know of no such standards or recommendations. Unfortunately, if you could
think to ask the question, someone else is eventually going to think that
there should be such recommendations or regulations.
Considering that the forest, lakes, land are bombarded with 1 kW per square
meter of
Richard:
My quick answer to your question is no. You ought to end up with the rated
0.2 dB insertion loss, or pretty close to it.
I presume that the insertion loss was measured in a 50 ohm system (could
also be 75 ohm or whatever) as the difference in power at a matched load
with and without
Richard:
The old standby coax relay people, Dow-Key, are still around at
www.dowkey.com. They've got a wide variety of coax switches and relays.
Regards,
Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618
Phone: 585 442 3909
Fax: 585 442 2182
j.schan...@ieee.org
- Original
Michael:
Try http://strategis.ic.gc.ca/sc_mrksv/spectrum/engdoc/spect1.html
This is Industry Canada's Spectrum Management and Telecommunications web
page.
Regards,
Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618
Phone: 585 442 3909
Fax: 585 442 2182
j.schan...@ieee.org
-
Amund:
I looked into this a few years ago, and for the United States, the answer
was yes: country of origin is required to be marked on imported goods.
Actually, this was a function of the percentage of foreign material/labor
incorporated nto the product, but the short anwswer was yes.
I
Derek:
You obviously are facing a challenge (a.k.a. problem).
Sometimes you actually have to make things yourself, and this may be one of
those times.
For the inductors, I'd say you will have to go with air core. I've done air
core inductors up to the hundreds of microhenries (for LF antenna
Mike:
My experience tells me that an attenuator designed for the same
impedance as the transmission line, will **always** improve the
VSWR at the source, irrespective of how bad or good the load VSWR
is. (It is most helpful to think in terms of reflection
coefficients rather than VSWR directly,
Lou:
Maybe it's just me, but your typeface (font) is very hard to read. If this were
25 years ago, I'd suggest you change your ribbon. Who knows, maybe that's still
the problem.
Regards,
Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618
Phone: 585 442 3909
Fax: 585 442 2182
Ed:
There is a special place in Heck reserved for censors.
The problem for any company is that there is no way to know for
sure what the censor software will find undesireable. I saw that
with web filtering at a previous employer. In particulat, I
remember that it didn;t like to display an
Bob:
This is not from personal experience, but from a two page ad in
the IEEE Antennas Propagation magazine for Dec 2001 that I was
just reading:
DASY4 Dosimetric Assessment System
Schmid Partner Engineering AG (Switzerland)
www.semcad.com
www.speag.com
i...@speag.com
It looks impressive
Andrew:
Chili, which is a suburb of Rochester, New York, follows the same
requirements as the rest of the United States. Since you already
have UL, you will need FCC Part 15 A or B non-intentional
radiator certification.
If you happened to be referring to Chile, the country in South
America,
George is correct so far as normal fluorescent, and of course,
incandescent, lighting. These are not regulated for emissions in
the US. But the new energy-saving RF lighting devices (bulbs) are
regulated under FCC Part 18.
The limits appear to be quite generous. The regulations are found
in
Try http://astimage.daps.dla.mil/quicksearch/
Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618
Phone: 585 442 3909
Fax: 585 442 2182
j.schan...@ieee.org
- Original Message -
From: Brodie Pedersen brod...@nonin.com
To: emc-p...@majordomo.ieee.org
Sent: Thursday, January 03,
Leslie:
The document TM-650 Test Methods Manual is described on the IPC
website as Contains over 150 industry approved test techniques
and procedures for chemical, mechanical, electrical, and
environmental tests on all forms of printed boards and
connectors.
It can be ordered from the IPC
Moshe:
Bellcore is now called Telcordia. The Bellcore documents can be
ordered on the web, go to
http://telecom-info.telcordia.com/site-cgi/ido/index.html
for information and catalogs of available documents. I've ordered
them in the past, and if they would sell to me, they will sell to
anyone.
I agree with Chris.
Chris expressed my opinions better than I could have, and would
have, if he hadn't gotten there first.
John's detailed responses have been very informative and
educational. He must devote a good deal of time to this group.
These efforts should be appreciated not deprecated.
Dear KC Chan:
For the RF standards, take a look at ETSI EN 300 330 on
Short-range devices (SRD). This is available from www.etsi.org.
Also look at ERC Recommendation 70-03 obtainable from www.ero.dk.
These should get you started.
Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618
Amund:
In answer to your question, I would cite the words of President
Ronald Reagan, quoting Chairman Gorbachev, quoting V.I. Lenin:
Doveryay, no proveryay. - Trust, but verify.
Regards,
Jack
Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618
Phone: 716 442 3909
Fax: 716 442 2182
Scott:
Very, very, likely..
Jack
- Original Message -
From: Scott Barrows sbarr...@curtis-straus.com
To: Jacob Schanker schan...@frontiernet.net; PSTC
emc-p...@majordomo.ieee.org
Sent: Thursday, October 25, 2001 5:10 PM
Subject: Re: NEC Question BUT REMEMBER OSHA
| Jacob,
| I would
Alex:
Good Show.
I am curious as to HOW the unfamiliar manufacturer's driver got
into your product. It seems this was a costly substitution in
terms of time and lab fees.
I wonder if you are a victim of the Purchasing as a Profit
Center Syndrome. This is the characteristic of too many
Rich:
You are implying, but not stating, that NEC has the force of law
regarding the domestic environment.
This differs with my understanding, or lack thereof. I have
always regarded the National Electric Code as a recommended set
of standards and practices which enabled localities to reference
Rochester, NY 14618
Phone: 716 442 3909
Fax: 716 442 2182
j.schan...@ieee.org
- Original Message -
From: Nikolassy, Anton anton.nikola...@fmglobal.com
To: 'Jacob Schanker' schan...@frontiernet.net;
wo...@sensormatic.com; emc-p...@majordomo.ieee.org;
mi...@ucentric.com
Sent: Thursday, October 25
Mike:
There is no Federal requirement for the manufacturer to have
equipment listed or NRTL approved. The requirements are set by
localities, as Richard Woods clearly points out.
I can understand that in some companies, the powers-that-be
have little patience with the time and expense of
Excuse a slightly peripheral question.
I always called it (an oily sort of brownish paper) Fish paper. I
assumed the name came from the use of fish oil to prepare it in
the 1800's. I see you are referring to it (is it the same thing?)
as fische paper. Is that what it is sold as? Was it invented
The mention of traceable calibration for a steel ball makes me wonder
(tongue partially in cheek) about verification of the gravitational constant
involved in the testing. Are adjustments to be made for local gravitational
anomalies, altitude above sea level at the place of measurement, and the
Richard:
Radio approval requirements still remain largely unharmonized. It really is
a country by country thing, but there are some guidelines that you can
follow to reduce the amount of work and grief. I speak from first hand
experience.
1) Have Marketing define which countries are your target
Bob:
You should be aware that there is a UK amateur radio band at 135.7 - 137.8
kHz. Please keep that in mind both from an interference and from an immunity
standpoint. You'll need to check the RA's website for technical limitations.
Another resource is the RSGB's website at www.rsgb.org.uk.
Chris:
Your comment about metallic coatings on display windows not being useful for
RF shielding made me sit straight up (from my usual scrolling the email
slouch).
You probably know that there are several vendors who market metallic coated
plastics for display windows and certainly imply, if
I followed the recent discussion threads on this topic, but it is not in my
main stream of interest. However, I just remembered an extensive report I
had seen on the subject.
The report is Investigation into possible effects resulting from dithered
clock oscillators on EMC measurements and
Dear Mr. Chan:
Part 95 ..is.. the FCC Part which covers radio control transmissions.
Subpart C is titles Radio Controlled (RC) Radio Services. Paragraph 95.207
specifies the frequencies which may be used. These are in the 26-27 MHz and
72-76 MHz ranges, and must only be specific frequencies. You
Paul:
STA stands for Special Temporary Authorization.
In my experience, it is a process for getting short-term (up to 6 month) FCC
authorization to operate a radio transmitter under either unusual
conditions, or conditions for which you don't have a currently valid
license.
For instance, I've
All:
This sounds like another UL. That's UL as in Urban Legend.
Just picture GTE telling someone that they should tell EVERYONE they know.
NOT going to happen.
Before we flood emc-pstc and the Internet with this urgent warning - think
about it first.
Regards,
Jack
Jacob Z. Schanker, P.E.
65
Robert:
To my best recollection, the essential difference is that Div. 2 is an
environment subject to occasional presence (leaks) of flammable/explosive
gases, while Div. 1 is where this stuff is always present or potentially
present. I suppose this is a simplification, but I think it expresses
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