[AMRadio] QRM fron Neighbor's Security System

james.liles james.liles at comcast.net
Thu Jan 21 22:10:00 EST 2010

Hi Jim:
May have been a coincidence that the same home started radiating a sweep that behaves like spread spectrum 7.1mc to 8.5mc at the same time that the security/control system was installed.  I hate to knock on a neighbors door and ask to walk around with a probe looking for illegal or inappropriate sources of radio interference.  Don't know exactly how to do that but I will, and I'll verify the source, manufacture, and model of the rogue equipment.  Then I'll send a note to the FCC and copy this reflector with the response.  If they are willing to engage the problem, I'll apologize for inferring that they are driven by money alone and maybe enjoy the 40 meter band again.  Kindest regards Jim K9AXN        
  ----- Original Message ----- 
  To: james.liles at comcast.net 
  Cc: AMradio 
  Sent: Thursday, January 21, 2010 6:51 PM
  Subject: QRM fron Neighbor's Security System


  You reported the following.  "I have recorded a problem like this with an 8566B in peak mode.  There is a 
  continuous sweep from about 7.1mc to 8.5mc at a two to five second rate. 
  Traced it to a neighbor who just installed the X10 security and home control 
  system.  It's using the spread spectrum protocol and under 100mw but at 300 
  feet, makes 40 meters unusable.  Appears that the FCC has lost control to 

  If I had a problem like that, I would discuss it with Ed Hare, W1RFI, the ARRL Laboratory Manager.  Ed is quite active in fighting RFI, especially that involved with BPL systems.  I am pretty sure that you do not have to just accept whatever QRM is generated by your neighbor's unlicensed security system.  Ed would advise you on your rights and on how to proceed.  You can reach him at w1rfi at arrl.org .  

  Jim Hanlon, W8KGI

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