[RFI] Alarm Systems and EMI/EMC

[Jim Brown]

On Sat, 09 May 2009 12:28:05 -0700, Michael Tope wrote:

>Anyone know any home security equipment dealers who are hams or who
>know anything about EMI/EMC?

No experience with these guys, but security systems are notorious 
for RFI susceptibility.  FWIW -- that 300 MHz range is commonly used 
for garage doors and remote control of A/V systems. I don't know of 
instances of RFI to the RF functions, but expect problems with  RFI 
to other circuitry. The usual fixes are twisted pair wiring, caps 
across wiring from dry contacts, and chokes to kill common mode.  

73,

Jim K9YC