Hi Ron I don't know if the FCC will accept measurements taken is an anechoic chamber but.....
If you want to make some meaningful measurements in a chamber you have to make sure it is truly anechoic, you do not want any reflected waves. You should have the chamber validated to show that the chamber normalised site transmission loss is within +/-4dB of free space. As a consequence of the chamber being anechoic, you do not vary the height of the receiving antenna as there is no reflected wave from the ground. The antenna height will correspond to the centre of your calibrated "test volume". You have to remember that the measurements will be 6dB lower than those taken at an OATS because of the missing ground reflection, you should adjust your limits accordingly. The standard EN50147-2:1997 "Anechoic chambers. Alternative site suitability with respect to site attenuation" explains everything in detail. Regards Chris Colgan EMC & Safety TAG McLaren Audio Ltd mailto:[email protected] > -----Original Message----- > From: [email protected] [SMTP:[email protected]] > Sent: 23 November 1999 18:30 > To: [email protected] > Subject: FCC part 15 class B, testing > > > I would like to know if I can take compliance data for FCC part 15 class B > in an anechoic chamber if I can't > vary the receive antenna from 1 to 4 metres?? (The chamber is not tall > enough) Or do I need an OATS or GTEM? > I would also like to do FCC parts 22 and 24 on AMPS and PCS phones. Any > information would be appreciated. > > > > > > Ron Chernus, Associate Test Engineer, DVT > Denso International > Carlsbad, California, USA > > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). > ===================================================== Authorised on 11/24/99 at 09:49:33; code 37f48bf3FC50C35A. The contents of this E-mail are confidential and for the exclusive use of the intended recipient. If you receive this E-mail in error, please delete it from your system immediately and notify us either by E-mail, telephone or fax. You should not copy, forward or otherwise disclose the content of the E-mail. TAG McLaren Audio Ltd, The Summit, 11 Latham Road Huntingdon, Cambs, PE18 6ZU Telephone : 01480 415600 (+44 1480 415600) Facsimile : 01480 52159 (+44 1480 52159) --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
