a phantom signal source

[nobody@xxxxxxxxxxxx (Dave Houston)]

A while back there was a thread here about the possibility of noisy switch
mode power supplies (SMPS) spontaneously generating valid X-10 PLC codes.
Bruce Robin sent a noisy SMPS (in a charger) that was blocking X-10 activity
to Jeff Volp who ran some tests. AFAIK those tests failed to show any
spontaneously generated X-10 codes.

There was a recent thread on Smarthome's Insteon forum that, in part,
discussed phantom PLC codes being logged that went away when a CFL (with an
apparently noisy SMPS) was removed from the mix. Further investigation found
that the source of the apparently spontaneous codes was actually an ACT
CR134 coupler/repeater. When it was replaced with a plug-in passive coupler,
the phantom codes disappeared. Another factor was that the phantom codes
only appeared after a valid Status Request was transmitted.


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