Many years ago I used a 3109XP for testing powered wheelchairs, needed 30 V/m down to 26 MHz. This antenna worked well up to 80/100 MHz or so, and does even better in a small chamber where the tips couple strongly to the walls (the antenna current increases and the impedances are such that the field strength at a 3 meter distance increased as well). This was successful with a 500 watt-rated IFI tube amp (which actually put out ~1.2 kW in the 20-80 MHz range).
>From 80-1000 MHz, Ghery's point is well taken. For Immunity you don't need a calibrated antenna, the calibration is based on the isotropic probe in the uniform plane. Best Regards, Mike -----Original Message----- From: Ken Javor [mailto:[email protected]] Sent: Friday, January 08, 2016 3:21 PM To: [email protected] Subject: Re: [PSES] Best antenna for IEC 61000-4-3 ETS/Lindgren shows two biconicals they claim will do 10 V/m with the headroom required for 80% AM with 100 Watts input: the 3109, and the 3109XP. Not plugging ETS/Lindgren, just giving examples. I think part of the problem with hybrid biconical-logperiodics is that the antenna is very deep, so that if the tip of the logperiodic is 3 meters from the uniform field area (UFA), then the low frequency portion is close to 5 meters away. One way to fix that is to turn the antenna around, but if you are going to that trouble, you might as well have two different antennas, both optimized for their respective frequency ranges. Ken Javor Phone: (256) 650-5261 > From: Doug Smith <[email protected]> > Reply-To: <[email protected]> > Date: Fri, 8 Jan 2016 15:06:51 -0800 > To: <[email protected]> > Subject: Re: [PSES] Best antenna for IEC 61000-4-3 > > How about having an Amateur Radio Operator design an antenna optimized > for the lower frequencies? Or design one, one's self. Then calibrate > it against a known antenna. Should not be difficult. > > Doug > University of Oxford > Department for Continuing Education > Oxford, Oxfordshire, United Kingdom > -------------------------------------------------- > Doug Smith > P.O. Box 60941 > Boulder City, NV 89006-0941 > TEL/FAX: 702-570-6108/570-6013 > Mobile: 408-858-4528 > Email: [email protected] > Web: http://www.dsmith.org > -------------------------------------------------- > > On Fri, 8 Jan 2016 14:44:07 -0800, "Ghery S. Pettit" > <[email protected]> wrote: > Talk to the antenna vendors. 20 V/m with 100 Watts is going to be tough. >> >> Ghery Pettit >> >> -----Original Message----- >> From: Kunde, Brian [mailto:[email protected]] Sent: Friday, >> January 08, 2016 12:33 PM >> To: [email protected] >> Subject: [PSES] Best antenna for IEC 61000-4-3 >> >> I'm looking for suggestions on the best antenna to use for Radiated >> Immunity test according to IEC 61000-4-3 between 80Mhz and 1Ghz. (we >> use a dual ridge horn above 1Ghz). >> >> Our goal is to find an antenna which is not too large, yet, will give >> us good gain at the low end so we can generate 18-20V/m with a 100 >> watt amplifier. >> >> I've looked at the hybrid antennas and they just don't seem to have >> enough gain at the low end. It appears that most labs that use this >> type of antenna requires a 200 watt amp. >> >> Looks like a Log Periodic has much better gain and should work but we >> don't want the radials to get too close to the floor. Plus, some of >> these are nearly 2 meters long. >> >> Any suggestions or recommendations? What antenna do you use and how >> much power do you required to achieve 10V/m with 80% AM modulation >> without clipping?? >> >> Thanks, >> >> The Other Brian >> >> >> ________________________________ >> >> LECO Corporation Notice: This communication may contain confidential >> information intended for the named recipient(s) only. If you received >> this by mistake, please destroy it and notify us of the error. Thank you. >> >> - >> ---------------------------------------------------------------- >> 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]> >> >> All emc-pstc postings are archived and searchable on the web at: >> http://www.ieee-pses.org/emc-pstc.html >> >> Attachments are not permitted but the IEEE PSES Online Communities >> site at http://product-compliance.oc.ieee.org/ can be used for >> graphics (in well-used formats), large files, etc. >> >> Website: http://www.ieee-pses.org/ >> Instructions: http://www.ieee-pses.org/list.html (including how to >> unsubscribe) 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]> >> >> - >> ---------------------------------------------------------------- >> 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]> >> >> All emc-pstc postings are archived and searchable on the web at: >> http://www.ieee-pses.org/emc-pstc.html >> >> Attachments are not permitted but the IEEE PSES Online Communities >> site at http://product-compliance.oc.ieee.org/ can be used for >> graphics (in well-used formats), large files, etc. >> >> Website: http://www.ieee-pses.org/ >> Instructions: http://www.ieee-pses.org/list.html (including how to >> unsubscribe) >> 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]> >> >> > > - > ---------------------------------------------------------------- > 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]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities > site at http://product-compliance.oc.ieee.org/ can be used for > graphics (in well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > 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]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
