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Re: X10 Carrier Frequency
"tracey.gardner" wrote:
>
> Can someone please tell me roughly what frequency X10 uses
> for sending it's signals down the mains.
>
> ISTR 126kHz being mentioned?
X10 modulates the 50Hz mains carrier at every zero crossing*. The mains
carrier is modulated with burts of 120kHz. 48 or more cycles of 120kHz
is regarded as a 1 bit, fewer than 48 cycles of 120kHz is regarded as a
0 bit. The modulation window is between 250 usecs and 900 usecs of the
powerline zero crossing.
[* some controllers actually modulate twice more with successive delays,
in order to coincide with the zero crossing of all 3 phases in a 3 phase
system].
HTH.
ant
--
ant@xxxxxxx /\/\ www.ant.org
ant@xxxxxxx (`') www.homewireless.com
()
Megawatt Winged Avenger
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