[RFI] 40 meter RFI
Gary at doctorgary.net
Wed Dec 5 01:50:26 EST 2007
I have relocated to a qth where there is a deaf person with a TTY. In
order to allow them to know when a telephone call is coming in for
them on their TTY or when someone is ringing the doorbell a device
was made to signal in various rooms by flashing a light.
There is a transmitter and plug in receivers which are no longer
available I understand.
The transmitter is called a Powerflash interface Pro and the
transmitter is PSC01 X10
The receivers are Radio Shack Plug n Power appliance modules. They
plug into any wall socket and the device to be triggered plugs into
them. An older design, they have 2 wire plugs, not a three conductor
When the transmitter is excited the signal is passed through the
house wiring and the receiver triggers the light.
Full output with my amp on 80 will trigger the lights as will 300
watts on 7.010 MHz and at 7.3 MHz it takes 400 watts to trigger the
lights & No other bands are affected. All the lights trigger at the
same time throughout the house which makes me suspect it is the
transmitter which is stimulated as opposed to the receivers but this
is of course just a guess.
I tried wrapping the wires with ferrites with no change. Since the
devices plug into the wall socket, I wound an extension cord around a
ferrite rod and used this in-between the socket & transmitter with no
change in effect. I used this choke in-between the socket & receiver
with no benefit.
Any idea what else I could try, the devices use the wiring to
communicate with themselves.
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