FCC Technician Exam Question Of The Day (T7B06)

Q) What should you do first if someone tells you that your station's transmissions are interfering with their radio or TV reception?

A) Make sure that your station is functioning properly and that it does not cause interference to your own television

NJ2X Notes:
It is important to rule out a malfunctioning station first.  If your station is not functioning properly, you definitely want to know and resolve the issue immediately.  Often the problem is not with the station but the poor quality of filtering and shielding in consumer grade electronics.

The common-mode filter or choke can be very effective when it comes to RFI.  The common-mode filter or choke suppresses common-mode RF energy travelling on wires and coaxial cables connected to the TV.