The US had limits on other unintentional radiators since at least the 50s: low power AM transmitters, TV and radio receiver oscillators, garage door openers
For a long time (I think since the 30s) there was a generic limit of 15 uV/m at a distance of lamda/2pi, most of the low power AM TXs I built or bought as a kid were well within this limit but would still work with the home receivers. On Oct 17, 2012, at 11:11 AM, Pettit, Ghery wrote: > No limits in the US until the home computer came along and caused massive > hate and discontent. Prior to that it was primarily the Germans (VDE > 0871/6.78) that worried about this matter. > > Ghery S. Pettit > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of John Woodgate > Sent: Wednesday, October 17, 2012 10:59 AM > To: [email protected] > Subject: Re: [PSES] OATS vs FAR Radiated Emissions Limits > > In message > <63e38a5b081437478c77651f3d56c64f2517f...@orsmsx102.amr.corp.intel.com>, > dated Wed, 17 Oct 2012, "Pettit, Ghery" <[email protected]> writes: > >> And, why did we have the limits? Because early home computers were >> LOUD and interfered with everything. The limits we have today fixed >> the problem. > > With respect, I think these things were set up in the 1930s, not 1980s. > -- > OOO - Own Opinions Only. See www.jmwa.demon.co.uk > The longer it takes to make a point, the more obtuse it proves to be. > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK > > - > ---------------------------------------------------------------- > 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://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 <[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://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 <[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://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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
