During WW II, WLW in Cincinnati broadcast at 500 KW in order to reach the interior farmland of the US using ten parallel 50 KW transmitters. Lots of annecdotes about singing fences, pickup in tooth fillings, etc. It returned to 50 Kw after the war.
Bob Ken Javor wrote: >All, > >I need to know what the legal rf transmit power limit is for broadcasters in >the 530 to 1710 kHz AM broadcast band in the USA. I believe the number is >50 kW, but I have several questions: > >1) Is 50 kW correct? > >2) Whether the correct answer to (1) is 50 kW or another number, does that >number represent effective radiated power? That is, does the number include >antenna gain or is it just the transmitter power available at the antenna >input terminal? > >3) If the number is just transmit power, is 4 dBi a reasonable maximum gain >for a real-world AM broadcast antenna? > >4) Whether the power figure is ERP or just power available to the antenna, >does it represent average or unmodulated power, or is it the envelope of >peak modulation? > >Thank you in advance, > >Ken Javor > >- >---------------------------------------------------------------- >This message is from the IEEE Product Safety Engineering Society >emc-pstc discussion list. Website: http://www.ieee-pses.org/ > >To post a message to the list, send your e-mail to [email protected] > >Instructions: http://listserv.ieee.org/listserv/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] > >All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc > > > > - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
