Ken, Here is a link to 47 CFR 73 which governs the licensing of AM radio stations. In section 73.211 there is referenced a 100 kW ERP for Class C stations. Power levels are determined by location (some areas cannot exceed 50 kW and antenna height). There are a number of sections on antenna requirements. Looks like you will need to recalculate your antenna gain for non-isotropic.
Section 73.51 addresses how to calculate the power. http://www.access.gpo.gov/nara/cfr/waisidx_04/47cfr73_04.html Michael Peters From: [email protected] [mailto:[email protected]] On Behalf Of Ken Javor Sent: Thursday, November 10, 2005 3:38 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 **************************************************************** The information transmitted in this message is confidential and may be privileged. Any review, retransmission, dissemination, or other use of this information by persons or entities other than the intended recipient is prohibited. If you are not the intended recipient, please notify Analogic Corporation immediately - by replying to this message or by sending an email to [email protected] - and destroy all copies of this information, including any attachments, without reading or disclosing them. Thank you. - 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
