Didn¹t see any responses to this query, so just one possible qualification. The EMCO Model 3105 was only spec¹d to 12.4 GHz. Don¹t know how high in frequency you need to go. A casual inspection of the 3105 vs. the immediate follow-on 3115 revealed no observable differences, although some subtle machining in the coax-to-waveguide transition might have happened. If you need to go above 12.4 GHz, suggest using a directional coupler to measure reverse power loss above 12.4 GHz to ensure antenna is still a good match at those frequencies. If the match is still good but the pattern falls apart, you don¹t really care about that in a reverb chamber, because as you say the antenna is just to get power into the room; its gain/pattern doesn¹t matter. Much better to save your 3117 for RE work or RS work in a non-reverb environment.
Ken Javor Phone: (256) 650-5261 From: "Schaefer, David" <dschae...@tuvam.com> Reply-To: "Schaefer, David" <dschae...@tuvam.com> Date: Wed, 14 Mar 2018 03:35:19 +0000 To: <EMC-PSTC@LISTSERV.IEEE.ORG> Conversation: Antenna choice for susceptibility in a reverb chamber Subject: [PSES] Antenna choice for susceptibility in a reverb chamber Any reverb susceptibility experts able to provide guidance on antenna selection? We've got a choice of shiny new ETS 3117s, or older antennas similar to the 3105. I'd prefer to use the 3117s for radiated emissions in a FAR, not tie them up here. Does antenna choice really matter in reverb? As long as it isn't lossy, all the energy should be getting into the room. My only thought would be you have to ensure the radiating antenna doesn't have voltage breakdown issues when trying to hit Category G or L. Thanks, David - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> 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) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com> - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> 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 <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
