ROTFLMAO... But be careful, there are some cheap designs that use the chokes to 'decouple' the DC bus from mains/rectifier. Some units could go crazy an self destruct under some load conditions.
Brian > -----Original Message----- > From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Derek > Walton > Sent: Tuesday, December 08, 2009 6:59 AM > To: Brent DeWitt > Cc: Ken Wyatt; EMC-PSTC@LISTSERV.IEEE.ORG > Subject: Re: [PSES] Reference RF Source - Recommendations/reviews? > > I second Brents comments. > > If you want to have something cheap and cheerful, just use > an off shore > sourced power supply. You most likely won't even have to > take the filter > out... > > There is a reason good site sources cost so much. I have > researched them > a lot as well as designed a few for our proficiency program. > Of all the > sources, my preference is for the spherical radiators. I > feel these are > less affected by their surroundings and more consistent than > a box with > a rod sticking out. > > It's no good getting an awesome source and then not taking the stand > into account.... > > It all depends on your goal. > > Cheers, > > Derek Walton > L F Research > EMC Lab Services > > Brent DeWitt wrote: > > For low frequencies the overpriced EMCO conducted site > source simply > > used an off the shelf switching power supply with the > filter caps and > > chokes removed and a couple of different load resistors. > With all the > > scrap PC supplies around, you can't beat the price. Stability is > > nothing to write home about of course. > > > > Regards, > > > > Brent DeWitt > > Framingham, MA > > > > > > -----Original Message----- > > From: Ken Wyatt > > Sent: Dec 7, 2009 7:43 PM > > To: EMC-PSTC@LISTSERV.IEEE.ORG > > Subject: Re: [PSES] Reference RF Source - > Recommendations/reviews? > > > > Hi Neven, > > > > I'm unaware of commercial site sources that can get > down to kHz, > > however, I should think that would be easy to build > yourself. Just > > use poor EMC techniques (fast edge speeds, etc.)! > > > > I've also reviewed a couple of commercial harmonic > comb generators > > by AET - one of which was just a couple days ago. Both > are posted > > to my Web site. I also developed a home brew comb > generator that > > covers up to 2 GHz, the details of which I divulge during my > > seminars. :-) > > > > When I worked for Hewlett-Packard and later Agilent > Technologies, > > we commonly checked site-site correlation annually. The site > > source was a custom affair using a high-precision > > optically-controlled signal generator - all > battery-operated. The > > thing weighed a ton, but it was educational to see the results. > > > > Regards, Ken > > ---------------------------------------------- > > Wyatt Technical Services, LLC > > 56 Aspen Dr. > > Woodland Park, CO 80863 > > For help, send mail to the list administrators: > > Scott Douglas <emcp...@socal.rr.com <mailto:emcp...@socal.rr.com>> > Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org>> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org>> > David Heald <dhe...@gmail.com <mailto: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 <mailto:emc-p...@ieee.org>> > > All emc-pstc postings are archived and searchable on the web at > http://www.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to > that URL. > > Website: http://www.ieee-pses.org/ > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <emcp...@socal.rr.com <mailto:emcp...@socal.rr.com>> > Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org>> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org>> > David Heald <dhe...@gmail.com <mailto: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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@socal.rr.com> 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
