[RFI] DSC Alarm Panel 75 meters/False Alarms

[Jpaleng at cs.com]

The usual problem is RF pickup on the long sensor lines. Several of our 
customers have had success by putting split beads on these lines right at the 
electronics box. Our largest is 1/2" hole but you can split the cable into two or 
more so they will fit into the bead. Bead impedance is low on 75 but apparently 
the RF impedance of the electronic circuit is also low so they work. Easy to 
try. -- Jack, K6NY, Palomar Engineers