Anand- Any chance the radiated cell phone signal was getting directly into the optical receiver detector and causing problems at that point? Was the receiver assembly sufficiently shielded that you are certain that the agressor RF was making it's way into the circuit via the pcb transmission lines as opposed to either direct radiation into the detector or perhaps pickup on some exposed detector assembly pin. (or ingress into cables leading to your test equipment?) Just wondering..... (was the the offending phone a 800 MHz cell unit or a 1.9 GHz pcs ??) -Ray Anderson Staff SI Engineer Sun Microsystems Inc. Anand Mohan Pappu wrote: >We were testing the Bit Error Rate of our optical receivers at ~2GHz and >every time the cell phone would ring, the Bit Error would just blow up. >This shows that Cell phone EM waves are interfereing with the traces. >(Since there is no other element which can interfere) And conversely, it >shows that traces do emit EM waves. > >Anand > > > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu