Nope, it's a fact.
I had a satellite receiver that would kill the X10 signal.
There's a fix out there where you gut an X10 module and use it's filter circuitry to mute the filter circuit in the dish receiver.
I got brain ache thinking about a filter canceling a filter but it works.  :-)


-----Original Message-----
>From: "William \"Chops\" Westfield" <westfw@mac.com>
>Sent: Sep 19, 2009 3:28 AM
>To: "Microcontroller discussion list - Public." <piclist@mit.edu>
>Subject: Re: [EE] powerline ethernet?
>
<snip>
>
>Rumor has it that the RF filters found these days in most power  
>supplies interfere with the powerline protocols.  That makes a certain  
>amount of sense, but I'm not a very happy camper.  OTOH, both of the  
>test locations ran as fast or faster than the (old, 802.11b) wireless  
>network I have installed...
>




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