John,
What is the effect on 'uncertainty' calculation if a different set of antennas
is used for NSA?
.
Honeywell
David W. Sterner
Quality Assurance Engineering
Security & Custom Electronics
165 Eileen Way
P.O. Box 9035
Syosset, NY 11791
Phone: (516) 921-6704 x6970
Fax # (516) 364-6953
[email protected]
<http://www.honeywell.com <http://www.honeywell.com/> >
From: [email protected] [mailto:[email protected]]On Behalf Of Mowbray, John H
Sent: Wednesday, October 11, 2006 9:45 AM
To: Grace Lin; [email protected]
Subject: RE: Antennas for Volumetric Site Attenuation Measurement
Grace
My experience is that VCCI will accept the use of a bilog hybrid when it is
the recieving antenna for you normal measurements, but you need to use
biconical, log-periodic, or their diplole antennas for transmitting during the
validation measurements.
John Mowbray, P. Eng.
Senior EMC Engineer
NCR Canada, Ltd.
580 Weber St. N.
Waterloo, Ontario
N2J 4G5
519 884 1710 X5371
[email protected]
_____
From: [email protected] [mailto:[email protected]] On Behalf Of Grace Lin
Sent: October 11, 2006 9:19 AM
To: [email protected]
Subject: Antennas for Volumetric Site Attenuation Measurement
Dear Members,
Does anyone have a successful experience in volumetric site attenuation (per
ANSI C63.4, etc.) by using a pair of bilog hybrid antennas (30MHz to 2 or 3
GHz)?
A VIP from VCCI told me that I would be challenged by using a pair of bilog
hybrid antennas to perform volumetric site attenuation. For daily radiated
emission measurement, bilog antenna are popular, especially using automation
software for initial scan. For a manufacturer, it is hard to justify a pair
of biconical (30MHz-300MHz) and log periodic (300MHz-1GHz) antennas just for
site attenuation measurement, used once every three years (per FCC and
Industry Canada).
I did some research. There is a paper to address the measurement uncertainty
of the bilog antennas, titled: "Understanding the measurement uncertainties of
the bicon/log hybrid antenna" ( <http:
/www.ets-lindgren.com/manuals/Chen_Bilog.pdf>
http://www.ets-lindgren.com/manuals/Chen_Bilog.pdf) written by Zhong Chen of
ETS-Lindgren. I spoke to the author. He told me when using bilog antennas,
if the results do not meet 4 dB requirement, it might not mean the site was
not good as the measurement uncertainty might cause the incorrect results.
I am suggested to try to use a pair of bilog hybrid antennas to perform
volumetric site attenuation after a chamber manufacturer completing its
measurement and compare the results. The problem is: I am not sure if I can
convince my manager to rent a bilog antenna to try it. I only plan to
purchase one bilog antenna if it cannot be used for site attenuation
measurement. I figure out it may be a good idea to ask for your experience.
I appreciate your input.
Best regards,
Grace Lin
Crestron Electronics, Inc.
6 Volvo Drive
Rockleigh, NJ 07647
<http://www.crestron.com/> www.crestron.com
- ---------------------------------------------------------------- This
message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. Website: http://www.ieee-pses.org/
To post a message to the list, send your e-mail to [email protected]
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas [email protected] Mike Cantwell [email protected]
For policy questions, send mail to:
Jim Bacher: [email protected] David Heald: [email protected]
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
- ---------------------------------------------------------------- This
message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. Website: http://www.ieee-pses.org/
To post a message to the list, send your e-mail to [email protected]
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas [email protected] Mike Cantwell [email protected]
For policy questions, send mail to:
Jim Bacher: [email protected] David Heald: [email protected]
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email
______________________________________________________________________
- ---------------------------------------------------------------- This
message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. Website: http://www.ieee-pses.org/
To post a message to the list, send your e-mail to [email protected]
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas [email protected] Mike Cantwell [email protected]
For policy questions, send mail to:
Jim Bacher: [email protected] David Heald: [email protected]
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
