Up-front disclaimer: I have zero knowledge of the cited IEEE standard. That being said, the title excludes antennas, and it would seem that a discussion of antenna critical dimensions would be outside its scope in any case.
The critical dimensions of a horn are those affecting its gain and match to a transmission line. The gain is set by the open aperture dimensions, and the match is set by the flare angle and also (if applicable) the functioning of a waveguide-to-coax adapter. The latter can be checked measuring vswr into the horn from the transmission line, and that is easy to check measuring return loss mid-band using a directional coupler. Ken Javor Phone: (256) 650-5261 From: itl-emc user group <[email protected]> Reply-To: itl-emc user group <[email protected]> Date: Mon, 8 Aug 2016 04:30:04 +0000 To: <[email protected]> Conversation: Standard Gain Horn Antenna Calibration Subject: [PSES] Standard Gain Horn Antenna Calibration Hello All According to ANSI 63.4: 2014 Clause 4.7.3 ³Standard gain horns need not be periodically recalibrated, unless damage or deterioration is suspected or known to have occurred. If a standard gain horn is not periodically recalibrated, its critical dimensions (see IEEE Std 1309-2005) shall be verified and documented on an annual basis.² Can anyone point me in the direction of the clause in IEEE Std 1309-2005 which mentions critical dimensions? Thanks in advance. Regards, David Shidlowsky | Technical Reviewer Address 1 Bat-Sheva St. LOD 7120101 Israel Tel 972-8-9186113 Fax 972-8-9153101 Mail [email protected]/[email protected] Web www.itl.co.il <http://www.itl.co.il/> - ---------------------------------------------------------------- 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) <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 <[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]>
