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 <[email protected]> Sent: Monday, May 02, 2022 4:46 PM To: [email protected] 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 <[email protected]<mailto:[email protected]>> 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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