Re: a phantom signal source

["Jeff Volp" <JeffVolp@xxxxxxx>]

I did not monitor X10 line traffic while testing the Cellet cellphone
charger:

http://jeffvolp.home.att.net/x10_info/x10_Cellet_noise.htm

However, if you look at the 3rd photo down, you can see the ESM1 giving a
solid "X10 Good" indication when the charger was loaded with 20 ohms.  I was
testing how well the XTB-IIR AGC rejected the noise, and I did not see it
accept the signal as valid even though the ESM1 seemed to be happy with it.

Jeff

"Dave Houston" <nobody@xxxxxxxxxxxx> wrote in message
news:4757eb05.231349328@xxxxxxxxxxxxxxxx
>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.