Interference with television and radio leads to distortion of the picture and sound, the appearance of unpleasant noise. There are many types of interference sources, and just as many ways to suppress them.
Instructions
Step 1
If interference occurs during the operation of a certain electrical appliance, but is of an intermittent nature, it is caused by poor contact in the plug, switch, and connection points of the lead wires. To fix the problem, take a regular radio, switch it to the medium wave band, and then tune to a frequency that is free of stations. Use it to search for the place of interference along the entire length of the cable from the place of its connection to the network to the device. Then disconnect the power cable, clean the contacts of the switch or plug, then turn on the device and check that the interference has disappeared. If it turns out that interference occurs due to the oxidized contacts of the outlet, before cleaning them, turn off the machine in the shield, then use a probe-indicator to make sure that the voltage has really disappeared.
Step 2
If the source of interference is a lamp (incandescent or energy-saving) that is not screwed into the socket well enough, turn it off, let it cool, then turn it back on. If necessary, clean the socket and lamp contacts with the luminaire de-energized. Remember that the energy saving lamp itself is capable of producing slight but sometimes noticeable interference. Just move the receiver more than half a meter away from it.
Step 3
Significantly more intense interference is created by pulse transformers of halogen lamps. Connect the transformer to the lamp with shorter conductors, positioning it closer to the lamp. But it is better to replace it with a regular, low-frequency one - these are also available for halogen lamps.
Step 4
In the event that interference penetrates the receiving device not through the antenna, but through the network, connect it to the network through a special extension cord with a built-in filter. Do the same to suppress the penetration of interference into the network from another device capable of creating them (in particular, a computer or TV).
Step 5
Shielding is an effective method of suppressing both the penetration of interference into the device and the emission of interference by itself. To do this, use metal covers connected to the common wire of the device. They are called screens. Do not expose such screen to high voltage.
Step 6
Cables can also be shielded. Use them whenever the receiving device is too sensitive. With their help, you can eliminate the noise in the form of AC hum in low-frequency audio devices.
Step 7
Interference in the form of a hum, sometimes accompanied by clicks and rhythmically disappearing, comes from mobile phones, the signals of which are detected by parasitic nonlinear elements of a radio receiving or amplifying device. Just move the phone farther, and such interference will disappear.
Step 8
Try connecting an external antenna to the receiver with a shielded cable (and a 75-ohm coaxial cable to the TV). Interference will disappear not only due to the distance of the antenna from its source, but also due to the change in the signal-to-noise ratio.
