The AR approach of multiple frequencies at the same time from a single antenna seems simpler.
-- Ken Javor (256) 650-5261 From: Patrick <conwa...@gmail.com> Reply-To: Patrick <conwa...@gmail.com> Date: Friday, May 6, 2022 at 11:01 AM To: <EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] Dual antenna during RE test ? Hi Bill and everyone- I am grateful for the insights. I have two goals- first is two antennas for radiated emissions. Second goal is dual antenna for radiated susceptibility(i.e. immunity ). The insights on emissions are a great start. Has anyone attempted dual antennas for susceptibility/immunity? -Patrick. On Thu, May 5, 2022 at 10:52 PM Bill Owsley <000000f5a03f18eb-dmarc-requ...@listserv.ieee.org> wrote: No clue as to what your thinking is about using multiple antennas in testing. We used 4 masts, high band and low band at 3 m and 10 m.. NSA came out fine. Been doing it for about 3 or more decades. If ya gots the money, spend it on more hardware. One radiated run in about 30 minutes cover high and low band at 3m and 10m. All interesting freq noted for followup. ps. Even tho' all document the azimuth and altitude, no one uses it later. Useless info to fill out. Every test setup is different, even using the same equipment. On Monday, May 2, 2022, 06:10:34 PM EDT, David Schaefer <000012867effceb4-dmarc-requ...@listserv.ieee.org> wrote: Prescans you could do vertical and horizontal at the same time, but the problem with final data is you need to maximize. The worst turntable angle for V and H is probably different, so you can’t maximize the antenna height at the same time. There is also the issue of NSA – was NSA data taken with the 2nd antenna and mast in the chamber? And with them both moving how will that affect results? I heard the Keysight team in California was planning on taking some data to investigate, but that was pre-covid so it probably got put on the back burner. David Schaefer Technical Manager Element Materials Technology 9349 W Broadway Ave Brooklyn Park , MN 55445 , United States O +1 612 638 5136 ext. 10461 david.schae...@element.com www.element.com From: Paasche, Dieter [mailto:dieter.paas...@christiedigital.com] Sent: Monday, May 2, 2022 3:59 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Dual antenna during RE test ? CAUTION:This email originated from outside of Element Materials Technology. DO NOT click links or open attachments unless you recognize the sender and know the content is safe. Please contact IT Service Desk if you are in any doubt about this email. Hi, I have seen that too at HP in Sacramento, CA. One antenna was in Vertical polarization and the other in Vertical. In my personal opinion, it is Ok for pre-scan, but I think it is complicated for the final scan. I think you still have to test each frequency and polarization one by one. Sincerely, Dieter Paasche This e-mail message (including attachments, if any) is confidential. Any unauthorized use, distribution or disclosure is prohibited. If you have received this e-mail message in error, please notify the sender by reply e-mail or telephone and delete it and any attachments from your computer system and records. From: Manny Barron <mbar...@ieee.org> Sent: Monday, May 02, 2022 4:46 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Dual antenna during RE test ? CAUTION:This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Back around 1998 when I worked for Tandem Computers (purchased by Compaq in 1998, then purchased by HP in 2001), I visited the HP EMC Lab in Washington state (I went to see their 10m chamber since we were thinking of getting a 2nd 10m chamber, which we did). Well they used two antennas connected to two separate receivers for their RE tests. Can't remember if it was horizontal and vertical OR if it was two frequency ranges (30-300MHz and 300-1000MHz), but it was definitely two antennas and two receivers. At that time they were also experimenting with 4 antennas but I think still 2 receivers, but don't know if that was actually implemented. They wrote their own custom test software to handle the multiple antenna / receiver combinations. The guy who ran that HP EMC test lab was Bob Dockey who later went to Philips Medical, if you can find him maybe he can elaborate on their RE test system of the time. A year later we (now Compaq) purchased a new 10m chamber (now we had two), so I was thinking about the two antenna RE test method as well. But then in 2002 (now HP), HP shut down two full EMC labs with three 10m chambers (all within 1 mi area in Cupertino, CA), and laid off almost all EMC personnel, something about too many labs and equipment after the corporate merger. They ended up taking equipment to be tested to their Roseville, CA EMC test lab, about 100 miles north. So I never got a chance to research and implement the 2 antenna RE test system. Had all the equipment, but it was too late. Manny Barron On Mon, May 2, 2022 at 11:00 AM Patrick <conwa...@gmail.com> wrote: Hi All - I'm wondering if there is any academic or practical literature on the use of two antennas during an emissions test. For example, research or experiments on the use of two DRH's above 1.0 GHz, side-by-side, one vertical, the other horizontal. Have any researchers looked at this? Are there any experimental studies? Thank you. -Patrick - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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