XPost: comp.sci.electronics, rec.electronics, sci.electronics   
   XPost: sci.electronics.misc   
   From: bobbylarter@gmail.com   
      
   Peter Hucker wrote:   
   > We have a wireless network at work which appears to have gone downhill since   
   the workmen installed PIRs for the burglar alarm.  One of them in particular   
   appears to cause dropped packets the closer a laptop is to it.  Is this   
   possible??  It's not a    
   wireless PIR as far as I know, as I can see some leftover cable he was using   
   which is a multicore (about 10 cores) type similar to phone systems, so I   
   assume this is for the signal aswell as power.  The person in that office   
   swears blind that there were    
   absolutely no problems until the PIR was installed above her desk, and now   
   when I check, about 60% of the packets are being dropped.  Moving her laptop   
   to the opposite side of the room it drops only 5% of packets.  PIRs used to   
   just pick up infrared of    
   your bodyheat, but I think now they are also motion sensors?  Perhaps this   
   means they are sending out a signal and bouncing it off you?  Perhaps this   
   could interfere with wireless networking?   
      
   The IR sensor might be one of the dual sensor (expensive!) type that   
   also include a microwave T/R motion sensing circuit. That would be very   
   likely to interfere with wireless networking systems. The security   
   company should be able to tell you for sure.   
      
      
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