The discussion when >Why do the modules FCC grants have this restrictions?
# Probably because co-located transmitters can, and very often do, generate # intermodulation products at out-of-band frequencies, such as F1 # + F2 and F1 - F2, also 3rd order products such as 2F1 - F2. And there is sometimes a restriction on the antenna (gain/efficiency) on some low power devices (LPD) which may be negated if the device can cross couple onto another antenna system (even if the other antenna system is not designed for the LPD frequency) and radiate more effectively that had been intended - thus potentially causing interference etc. Regards Tim 6239 desk A1N21 P Please consider the environment before printing this email. From: [email protected] [mailto:[email protected]] On Behalf Of John Woodgate Sent: Tuesday, January 08, 2008 10:18 AM To: [email protected] Subject: Re: FCC co-location *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. In message <31851be7463bd94abee59e88cbd456f5cf6...@esealmw109.eemea.ericsson.se>, dated Tue, 8 Jan 2008, Anders Svensson B <[email protected]> writes: >Why do the modules FCC grants have this restrictions? Probably because co-located transmitters can, and very often do, generate intermodulation products at out-of-band frequencies, such as F1 + F2 and F1 - F2, also 3rd order products such as 2F1 - F2. You need to check your product for this effect. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk For very important information, please turn over. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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/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 SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England & Wales. Company no. 02426132 ******************************************************************** This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. ******************************************************************** - 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/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
