The ferrite loaded mast cable is obviously there for common mode rejection. As
such, the CM can only be sourced form unbalanced baluns at the antenna, or
from the imbalanced complex impedance variance caused from the mutual
inductance of the antenae over the ground plane.
An antenna expert such as
For those curious about the health effects of laser light (or damage
caused by) or who want a pretty good explanation of laser classes and
other issues might try the Laser Institute of America web site. Their
address is:
http://www.laserinstitute.org/ for the home page and
Greetings Compliance Professionals!
The Orange County Chapter of the IEEE EMC Society is holding it's bi-monthly
meeting in Costa Mesa on Thursday, December 10th. A description of the
Technical presentation and the Speakers is given below.
The meeting will be held at Emulex Corporation,
IEEE EMC SOCIETY
ROCKY MOUNTAIN CHAPTER
DECEMBER MEETING
TUESDAY DECEMBER 8, 1998
VENDOR NIGHT
1999 CHAPTER OFFICIERS ELECTION
WHERE:
Raintree Plaza Hotel
1900 Ken Pratt Blvd.
Longmont, Colorado 80501
Phone: 303-776-2000
Silverthorn Room
1850 Industrial Circle
Longmont,
How about the converse, are there reasons not to put the ferrites on? Using
this example and assuming I had a balanced bicon so didn't need the
ferrites. If I put on a log periodic would I have to put ferrites on for
that?
If there is no drawback to the ferrites, then it seems that it would be
Richard,
Re the ferrites during NSA measurements (and others): I was under the
impression that the ferrites prevented the shield of the vertically hanging
cable from becoming an additional (and unwanted) reflector element.In
making some NSA measurements I found adding ferrites to the hanging
hmellb...@aol.com wrote:
The ferrite loaded mast cable is obviously there for common mode rejection. As
such, the CM can only be sourced form unbalanced baluns at the antenna, or
from the imbalanced complex impedance variance caused from the mutual
inductance of the antenae over the ground
Jean-Marie,
This is the information that I have (current as of April this year, it
may be different now!)
The agency in Slovakia responsible for EMC is EVTU. EMC is mandatory,
the applicable standard is EN55022. Apparently additional testing is
required even if the equipment is already CE marked,
Jean-Marie,
After sending the first reply I had another check. In the latest copy of
Approval magazine there is an article about Eastern European Telecoms
Approvals. The author is a Mark Boughen from KTL. He may or may not be
able to help you. His email address is mboug...@ktl.com Might be worth a
Derek
As a father of one little girl (hope she won't be the only), I must say
I don't like things like this to be taken nonchalant. I leave that role
to the people that don't care. If we, who chose to work for safety,
don't care, who will? I just don't like to see lasers as toys in
children's
Here is what I got...
Phone: 978-486-0888
Fax 978-486-8828
Email: lbn10...@world.std.com
WEB: //world.std.com/~csweb/conformity.html
Good Luck
-Original Message-
From: randall.flind...@emulex.com [SMTP:randall.flind...@emulex.com]
Sent: Thursday, November 12, 1998 4:12 PM
To:
Randy:
Lorie Nichols can be contacted at (978) 486-0888.
Also, you can try m...@conformity.com
http://www.conformity.com
Regards,
John R. Kretsch, P.E.
Compliance Engineering Supervisor
ADC Broadband Communications
john_kret...@adc.com
-Original Message-
From:
Try
http://www.conformity.com
--
From:
randall.flind...@emulex.com[SMTP:randall.flind...@emulex.com] on behalf of
Flinders, Randall[SMTP:randall.flind...@emulex.com]
Reply To: Flinders, Randall
Sent: Thursday, November 12, 1998 4:11 PM
To: 'emc-pstc'
Subject:
Imbalance may not be entirely due to an antenna. For example, a site I used
in Fountain Valley, California, had a lot of FM broadcast intermod while
using a 200-1000 MHz LP. Ferrites on the feed line fixed that; the antenna
did not reject common-mode 100 MHz energy on the coax shield, which was
When attaching the Ferrites, do they need only be attached to the Vertical
portion of the cable? Assuming the common mode currents force the cable to
become an active element in the system, then it would stand to reason that
the portion of the cable running across the Mast mounting bar
The ferrites remove the cable from the fields to some degree. No matter
how perfect the baluns are the cable still represents a conductor out in
the middle fo the fields you're working with.
- Robert -
On Thu, 12 Nov 1998, WOODS, RICHARD wrote:
Hans,
I would say this assumption is basically correct. The most sensitive
area of the cable is that adjacent and parallel to the antenna. In the
case of a bicon this is about the top 1m or so. Ferrite on the top
horizontal section would only be of benefit if the antenna is not
perfect, so a couple
Related to the issue of reflections on an OATS is contaminants. I have
heard from a few sites that have all weather test capabilities, that they
need to periodically pressure clean their shelters -- 6 dB was suggested as
a variation due to contaminants. If the effects of contaminants apply to
Ever hear of the Stealth Bomber? Same idea.
Daniel W. Mitchell
Product Safety
EOS Corp.
--
From: Robert Bonsen[SMTP:rbon...@orionscientific.com]
Sent: Friday, November 13, 1998 8:03 AM
To: emc-p...@majordomo.ieee.org
Subject:Re: ANSI C63.4-- OATS construction issues
I
It also helps to run the antenna feed horozontally for about 2.0 - 2.5
meters before dropping it vertically to the ground plane.
-- Forwarded by Robert E. Heller/US-Corporate/3M/US on
11/13/98 03:24 PM ---
I am looking for a 6-slot C VXI mainframe with all associated optional
shielding and metalwork, if applicable, required to meet Class B emissions
limits. It will be used to help certify a customer's VXI product to EN
55022 Class B. Most VXI mainframes claim compliance only with 55011 Class
Jeff,
Items 2 and 4 are probably correct. It is a very specialized subject
that most compliance people do not deal with. You have a list of 10
questions that are quite general like are water fittings inherently
unsafe?. These probably require detailed answers that take some
research. Most
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