Thank you very much - much obliged. Ken Javor Ph. (256) 650-5261 Mobile: (256) 348-1611 Mobile email: [email protected]
> On Jun 30, 2026, at 1:50 PM, Larry K. Stillings > <[email protected]> wrote: > > Ken, > > Yes that is correct 10 Meter Horizontal factor is used for both polarities > and both distances (3 & 10 meters) because its “free-space” according to the > standard(s).😉 > > Larry K. Stillings > Compliance Worldwide, Inc. > Test Locally, Sell Globally and Launch Your Products Around the World! > FCC - Wireless - Telecom - CE Marking - International Approvals - Product > Safety > 357 Main Street > Sandown, NH 03873 > (603) 887 3903 Fax 887 6445 > complianceworldwide.com <https://complianceworldwide.com/> > Follow us on social media > <image001.png> linkedin.com/company/compliance-worldwide-inc > <x-msg://5/linkedin.com/company/compliance-worldwide-inc> <image002.png> > x.com/complianceww <x-msg://5/twitter.com/complianceww> > Privileged/Confidential Information may be contained in this message. If you > are not the addressee indicated in this message (or responsible for delivery > of the message to such person), you may not copy or deliver this message to > anyone. In such case, you should destroy this message and kindly notify the > sender by reply email. Please advise immediately if you or your employer do > not consent to Internet email for messages of this kind. Opinions, > conclusions and other information in this message that do not relate to the > official business of my firm shall be understood as neither given nor > endorsed by it. > > From: Ken Javor <[email protected] > <mailto:[email protected]>> > Sent: Tuesday, June 30, 2026 2:48 PM > To: [email protected] <mailto:[email protected]> > Subject: Re: [PSES] ANSI C63.4 / CIS{R 16-X query > > So, playing this back, am I correct that for EMI testing, as opposed to site > validation, only a single antenna factor (height- and polarization > independent) is used, and the antenna factor used is determined horizontally? > > Thank you, > > Ken Javor > Ph. (256) 650-5261 > Mobile: (256) 348-1611 > Mobile email: [email protected] <mailto:[email protected]> > > > > > > On Jun 30, 2026, at 1:36 PM, Larry K. Stillings > <[email protected] <mailto:[email protected]>> wrote: > > Ken, > > A while back the ANSI C63.5 standard went to a 10 Meter separation distance > with a 2 Meter transmit height in the Horizontal Polarity (quasi-free space) > even though they are calibrated over a very large ground plane (there is a > minimum size and flatness requirement in the standard(s). > > The Transmit antenna is at the 2-meter fixed height and the receive antenna > is swept from 4 to 1 meter. > > Those factors are used at 3- or 10-meter distance in both polarities > (horizontal and vertical). > > Most of the labs are using bilog (combination biconical and log periodic > antennas from 30 to 1000 MHz at this point). Although some labs are using > dual mast configurations with a bicon and log periodic antenna at 10 meters > in claims that speeds up the testing however only in the oversized 10m > chambers where site calibration allows that to be achieved. > > Personally, in the past I still have had our measurement antennas calibrated > at 3 and 10 meters as the factors are different due to mutual coupling. > > Note, I am talking about antennas used for measurement not for the > calibration of OATS or chambers. Calibration antennas (Bicons and Logs) get > done at both 3 and 10 meters in both the horizontal and vertical polarities > and mutual coupling factors are used for the bicons as part of the validation > process of the sites. > > > Larry K. Stillings > Compliance Worldwide, Inc. > Test Locally, Sell Globally and Launch Your Products Around the World! > FCC - Wireless - Telecom - CE Marking - International Approvals - Product > Safety > 357 Main Street > Sandown, NH 03873 > (603) 887 3903 Fax 887 6445 > complianceworldwide.com <https://complianceworldwide.com/> > Follow us on social media > <image001.png> linkedin.com/company/compliance-worldwide-inc > <x-msg://4/linkedin.com/company/compliance-worldwide-inc> <image002.png> > x.com/complianceww <x-msg://4/twitter.com/complianceww> > Privileged/Confidential Information may be contained in this message. If you > are not the addressee indicated in this message (or responsible for delivery > of the message to such person), you may not copy or deliver this message to > anyone. In such case, you should destroy this message and kindly notify the > sender by reply email. Please advise immediately if you or your employer do > not consent to Internet email for messages of this kind. Opinions, > conclusions and other information in this message that do not relate to the > official business of my firm shall be understood as neither given nor > endorsed by it. > > From: Ken Javor <[email protected] > <mailto:[email protected]>> > Sent: Tuesday, June 30, 2026 2:25 PM > To: [email protected] <mailto:[email protected]> > Subject: [PSES] ANSI C63.4 / CIS{R 16-X query > > To those of you who perform radiated emission qualifications to subject > standards on either open area test sites, semi- or fully anechoic chambers: > > By way of background, my direct experience and any future activity with RE > measurements is vehicle-specific EMI requirements, such as MIL-STD-461, > RTCA/DO-160, and CISPR 25, which are all made at one-meter separation. I > don’t have a current version of subject standards, and am not interested in > acquiring them ($$$). > > With respect to subject standards, what antenna factors are used today? At > one time, there were distance-specific antenna factors, such as 3, 10 or 30 > meter antenna factors. Is it just far field antenna factors today? > > Similarly, are separate polarization-specific (vertical and horizontal) > antenna factors used, or is just a single antenna factor, no matter how > determined in CISPR 16-1-6, or ANSI C63.5? > > Finally, how is the height-dependent nature of antenna factors treated? On a > 1 - 4 meter height sweep, the antenna factor for wire-type antennas is not > constant. My reading of CISPR 16-1-6 says it is a far-field factor, with > height dependence covered under the uncertainty assigned to the measurement. > > Is that the case, or is the height of the antenna somehow recorded and a > height-specific antenna factor applied? The latter doesn’t make sense to me, > but it is my understanding of what one engineer told me. > > Thanks in advance, > > Ken Javor > Ph. (256) 650-5261 > Mobile: (256) 348-1611 > Mobile email: [email protected] <mailto:[email protected]> > > > > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > [email protected] <mailto:[email protected]> > All emc-pstc postings are archived and searchable on the web at: > https://www.mail-archive.com/[email protected]/ > <https://www.mail-archive.com/[email protected]/%20> > Website: https://ewh.ieee.org/soc/pses/ > Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to > unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> > List rules: > https://pses.ieee.org/wp-content/uploads/2024/12/EM-PSTC-List-Rules.pdf > > For help, send mail to the list administrators: > Mike Sherman at: [email protected] <mailto:[email protected]> > Rick Linford at: [email protected] <mailto:[email protected]> > For policy questions, send mail to: > Jim Bacher at: [email protected] <mailto:[email protected]> > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > [email protected] <mailto:[email protected]> > All emc-pstc postings are archived and searchable on the web at: > https://www.mail-archive.com/[email protected]/ > > Website: https://ewh.ieee.org/soc/pses/ <https://ewh.ieee.org/soc/pses/> > Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to > unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> > List rules: > https://pses.ieee.org/wp-content/uploads/2024/12/EM-PSTC-List-Rules.pdf > > For help, send mail to the list administrators: > Mike Sherman at: [email protected] <mailto:[email protected]> > Rick Linford at: [email protected] <mailto:[email protected]> > For policy questions, send mail to: > Jim Bacher at: [email protected] <mailto:[email protected]> > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > [email protected] <mailto:[email protected]> > All emc-pstc postings are archived and searchable on the web at: > https://www.mail-archive.com/[email protected]/ > <https://www.mail-archive.com/[email protected]/%20> > Website: https://ewh.ieee.org/soc/pses/ > Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to > unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> > List rules: > https://pses.ieee.org/wp-content/uploads/2024/12/EM-PSTC-List-Rules.pdf > > For help, send mail to the list administrators: > Mike Sherman at: [email protected] <mailto:[email protected]> > Rick Linford at: [email protected] <mailto:[email protected]> > For policy questions, send mail to: > Jim Bacher at: [email protected] <mailto:[email protected]> > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > [email protected] <mailto:[email protected]>All emc-pstc > postings are archived and searchable on the web at: > https://www.mail-archive.com/[email protected]/ > > Website: https://ewh.ieee.org/soc/pses/ <https://ewh.ieee.org/soc/pses/> > Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to > unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> > List rules: > https://pses.ieee.org/wp-content/uploads/2024/12/EM-PSTC-List-Rules.pdf > > For help, send mail to the list administrators: > Mike Sherman at: [email protected] <mailto:[email protected]> > Rick Linford at: [email protected] <mailto:[email protected]> > For policy questions, send mail to: > Jim Bacher at: [email protected] <mailto:[email protected]> > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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