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Picture defects and countermeasures
The most common types of television interference are
as following:
SNOWY PICTURE
Snowy picture is usually caused due to weak signal.
Adjust antenna or install an antenna amplifier.
DOUBLE IMAGES OR “GHOSTS”
Double images are usually caused by reflections from
tall buildings. Adjust the direction of the antenna or
raise it.
RADIO WAVE INTERFERENCE
Wave pattern are moving on the screen, which are
usually caused by nearby radio transmitter or shot-
wave receiving equipment.
HIGH TEMPERATURE ELECTROTHERMAL INTER-
FERENCE
Diagonal, or herring-bone, patterns appear on the
screen or part of picture is missing. This is probably
caused by high temperature electrothermal equipment
in the nearby hospital.