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🛡Home Security => Problems and Troubleshooting => Topic started by: Al542 on December 01, 2018, 03:53:47 PM

Title: Type of modulation
Post by: Al542 on December 01, 2018, 03:53:47 PM

I have a scanner that can tune to 310mhz and can be set to any type of modulation. I'm trying to listen in to see what interferes with my alarm once in a while. Does anyone know what mode of modulation that X-10 is using. As in AM, FM, FSK or other.
Thanks
Al

Title: Re: Type of modulation
Post by: dhouston on December 01, 2018, 05:04:53 PM

OOK - On-Off-Keying which is a subset of ASK - Amplitude-Shift-Keying.
There's very few systems using 310MHz so I doubt you are seeing interference from non-X10 sources. A Palmpad lost under couch cushions is a frequent culprit.
 There's a brief description here...
https://www.laser.com/dhouston/rf.html (https://www.laser.com/dhouston/rf.html)