Ken, I believe 50 kW is the limit and it is unmodulated carrier power. 4 dBi is 1 dB down from a lossless 90 degree vertical. Many stations have directional antennas.
Dave Cuthbert Micron Technology From: [email protected] [mailto:[email protected]] On Behalf Of Ken Javor Sent: Thursday, November 10, 2005 1:38 PM To: [email protected] Subject: Limit on AM Broadcast power, USA 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
