Question: Mark, my TV is
plugged into an electrical receptacle that shares a common wall with a bedroom.
When the TV is on, the radio in the bedroom cannot be heard due to static. Do
you have any idea what may be causing the static and what I can do to stop or
filter out the static?
Answer: More than likely your
TV is emitting electromagnetic interference (EMI) or Radio Frequency
Interference (RFI) over the electrical circuit inside your home’s wiring or over
the airwaves.
Though designed not to, TV's can
still sometimes produce these types of line noise or spurious EMI/RFI signals.
For example, if the TV’s power supply is a switching type power supply, it could
be producing EMI/RFI signals that are spewing over the power line that feeds
your TV and radio, or over the airwaves.
To resolve this problem I would first
do a little troubleshooting. First, try plugging in another radio into the same
outlet to see if the problem is replicated on a different radio. If it is
replicated then the problem is most likely associated with the TV producing
unwanted EMI/RFI signals over the electrical wiring or airwaves. If the problem
is not replicated, then it may be that a filtering circuit inside your other
radio is either non-existent or has become non-working.
To reduce the interference affects on
your radio, first try moving your radio further away from the TV so that the
EMI/RFI signals emanating from the TV are reduced.
If that does not help, try moving
your radio to another outlet that is on another circuit breaker. This should
help isolate any noise coming over the wires to your radio.
Also, you can buy an EMI/RFI noise
filter that plugs into your outlet that is feeding your radio. You can then plug
your radio into the EMI/RFI noise filter. In many cases these types of filters
can resolve the problems that you are seeing, as they suppress any EMI/RFI line
noise that would otherwise feed into your radio or appliance.
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