Let's keep a perspective here.
Whether you wish to accept it or not, we are
all members of this list because we agree to the
terms of being a member of this list.
The administrators can be as dragonian or
libertarian as they wish. Thankfully they aren't
on both accounts.
I think they
Well, I must say that I agree with the spirit of what Chris is saying, if not
actually with his exact words!
I believe that a give and take is healthy; a difference of opinion should not
be anathema to this forum. However, we need to remain polite (not rude) and be
somewhat sensitive to the
David -- you are correct -- the mismatch in the system and antenna factors
still remain, regardless of the cable length
If the antenna (or whatever load) is not 50 ohms at some frequency, and the
source feeding the antenna (or whatever) is 50 ohms at that frequency, a
mis-match will exist.
Noop,
2.4GHz falls within EN 300 440 (1GHz-40GHz),
EN 300 220 covers frequencies from 25MHz-1GHz, and
EN 300 330 covers 9kHz to 25MHz.
Has anyone realized that some of the meaurement of EN
300 330 is extremely in-practical?
Leslie
--- Jacob Schanker schan...@frontiernet.net wrote:
Dear KC
Dear Colleagues,
Today is Friday, seems to me that all of us are very tired, and the last
couple of months stressed us more than we expected...
In my opinion, the ADMINISTRATORS of this VERY PROFESSIONAL GROUP deserves
100% OUR Respect.
The emc-pstc Discussion List is like a game: with
I do more listening than talking here...
AND
I agree with those who do NOT want you to leave!!
Daren A. Nerad
EMC Consultant / Engineer
at Hamilton Sundstrand
-Original Message-
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: Thursday, November 15, 2001 3:07 PM
To:
I don't understand that. You only get standing waves when a mismatched
transmission line is a significant fraction of a wavelength. If the
transfer of power from antenna to amplifier is in question, then you could
do what another list member suggested: calibrate antenna and amplifier
together
I have a question regarding Telecommunications Huts, NOT the equipment that
goes into them, but just the hut itself. I know that the standard for the
equipment is GR-63.
Telcordia has a standard, GR-43, Generic Requirements for Telecommunications
Huts, that I'm waiting for a copy of. Is
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.
Ken,
The added uncertainty is exactly as large as if you have a piece of cable
(assume too short to have relevant losses) inbetween.
David Pommerenke
-Original Message-
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: Friday, November 16, 2001 12:05 PM
To: Pommerenke, David;
Master of the Obvious, but it sounds to me like it is an attempt to make the
current waveform (to a limited degree) follow the the voltage waveform as
opposed to being a sharp spike replenishing a filter cap.
--
From: KC CHAN [PDD] kcc...@hkpc.org
To: emc-p...@majordomo.ieee.org
Subject:
Note I am replying to all. What is the measurement inaccuracy associated
with a mismatch if the transmission line is vanishingly short (relative to a
wavelength)?
--
From: Pommerenke, David davi...@ece.umr.edu
To: 'Ken Javor' ken.ja...@emccompliance.com, 'Ravinder Ajmani'
I second the sentiment, Woodgate is a valuable asset to this forum.
--
From: Chris Chileshe chris.chile...@ultronics.co.uk
To: 'John Woodgate' j...@jmwa.demon.co.uk, emc-p...@majordomo.ieee.org
emc-p...@majordomo.ieee.org
Subject: RE: My departure
Date: Fri, Nov 16, 2001, 5:04 AM
Careful...
We're playing with fire here. I don't think the list should be a place
for he said---she said...posturing contests...
I (for one) don't want a justification from the list admins.
I wonder why, and I perfectly understand Aprel's curiosity; but I don't
want to have it splattered
Thank God that PC is limited to the US. I'd hate to think that the rest of
the world was so narrow minded. Now, if we could just get rid of it!
Ghery Pettit
-Original Message-
From: john.merr...@modicon.com [mailto:john.merr...@modicon.com]
Sent: Friday, November 16, 2001 9:18 AM
To:
Rats, I was really hoping to stay out of this particular snit fit
but I believe that someone needs to stand up for the list administrators as
well. They have a very tough job from many different perspectives technical
and unfortunately sociological as well.
I haven't a clue what
Agree with you, Chris.
I hope John will return, I've learned a lot of good safety lessons from him.
Amund
Fra: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]Pa vegne av Chris Chileshe
Sendt: 16. november 2001 12:04
Til: 'John Woodgate';
John
I have appreciated your contributions to this board. Your absence only serves to
lower the quality of the technical discussions here. Those that are quick to
take offence must remember this is a international forum. PC is a US
phenomenon and is not the rule for the English speaking
In response to below
By definition it is impossible for a third harmonic to create more than two
peaks per half cycle and if the distortion is only third harmonic then the
peaks can never be separated by more than 45 deg. Even more confusion is
created from the ambiguity of the statement which
I concur fully with you say, John spends a lot of time answering questions
why can he not tell it how it is or at least how he sees it. We are after
all professional grown up's.
Alan E Hutley
Editor EMC Compliance journal
- Original Message -
From: Chris Chileshe
C'mon Woody, be a good Brit, put up a stiff upper lip and get back in the
game. If you can dish it out, you gotta be able to take it. If you
received a private message from one of the administrators, then I'm speaking
in total ignorance. If the representations are of the public variety
which
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
I echo Kate's opinion, I think the group deserves to understand what
happened so that these things don't happen in the future.
Regards
Kevin
Kevin Keegan
KES Associates
- Original Message -
From: k.macl...@aprel.com
To: chris.chile...@ultronics.co.uk; j...@jmwa.demon.co.uk;
Although I agree with sentiments expressed so far, I would not be as distressed
with John Woodgates departure if he was quickly replaced by someone of equal
luminosity such as JANET WOODHOG ;-)
All kidding aside...I think John should stay
(If it matters to the moderators...I am a
John,
I was alarmed and saddened to read your posting this morning. I, for one, feel
that the loss of your
valued input and comments will be sorely missed. I also feel that considering
your past
contributions to the group, although pointed at times, this action is not
warranted.
To the
Thirded (but only for the US :)).
Scott
James, Chris wrote:
Seconded!!
Chris James
__
Chris James
Engineering Services Manager
Dolby Laboratories, Inc. (UK)
www.dolby.com
-Original Message-
From: Chris Chileshe
Is Minks the plural for 'Mink' or is it always Mink in both singular and
plural?
Have I been misinformed?
Regards
- Chris
_
This message has been checked for all known viruses by Star Internet
delivered through the
Greetings,
I believe David is correct here, the effect of the mismatch between
antenna and preamp is still there and so all the available energy from
the antenna will not be transferred to the preamp. However, the effects
of the length of cable will be gone as with zero length there can be no
John,
Your departure will be loss to this forum, and I hope measures have been
taken to offer you the possibility of reconsidering.
Thank you for you help in the past, both on and off this forum.
Enci
---
This message is from the IEEE EMC Society
Another fine engineer shot down, in flames, by (yet another) 'PC' byte
jockey...
Has this become Yet Another Newsgroup/Listserv that hammers the nail that
stands up, and praises mediocrity?
My Opinion Only; Nothing to do with my employer's policies.
Brian
-Original Message-
From: John
I thought he was referring to this part of your
statement...
you will have multiple reflections on the cable between the antenna
and
the pre-amp.
This reflections will influence your measurement and cannot be
corrected
for by the antenna
factor.
thus removing the cable, removes the
John,
I have enjoyed your contributions to this forum and have learned a few
things from you as well. People who find your direct responses to
occasionally be offensive have a serious self-image problem and need to
lighten up. The purpose of this forum is provide an avenue for the open
Seconded!!
Chris James
__
Chris James
Engineering Services Manager
Dolby Laboratories, Inc. (UK)
www.dolby.com
-Original Message-
From: Chris Chileshe [mailto:chris.chile...@ultronics.co.uk]
Sent: 16 November
If the product fits the definition of a Short Range Device, the following
ETSI standards apply:
EN 300 440-1
EN 300 440-2
EN 301 489-1
EN 301 489-? check which one of the series applies to your product
You can download the standard from the ETSI web site for free.
Richard Woods
Sensormatic
Any possibility of reconsidering your decision John?
I think it would be a real shame to lose John's presence on the list.
While it would obviously be possible for us to contact him directly
( and I for one have done so in the past), I have always found it
educational to read John's responses
John
We often come across large systems or machines where we ask the
manufacturer for certification details for the components, they sometimes
are unable to get much information from their suppliers, a common example
is for transformers where it is unlikely that they have been tested, except
as
Group,
If a piece of telecoms equipment has the facility to use for example a
headset that is not supplied with the product, for emc purposes it is
necessary to perform conducted and radiated Immunity with a head set,
however I have sampled 5 different headsets on the market (there are many
more
John, you must do what you must do but I for one will be sorry to see you
leave.
Bob Heller
3M Product Safety, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
===
For Class C harmonics testing(active input power = 25 W), one requirement is
as follows
the third harmonic current, ...; moreover, the waveform of the input current
shall be such that it begins to flow before or at 60 deg., has its last peak
(if there are several peaks per half period)
Dear All
My client is looking for the standards of a 2.4GHz wireless headphone
system(not a SS product) for EU country. Would like to know what is the
appropriate EMC and RF standards under EMC directive and RTTE directive.
Thank You
KC Chan - PDD
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