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Yet sometimes the problem you have may not be that simple.
For example, images of two channels appear on the screen at the same time, uneven bands of spots or "mesh fabric" pattern come into sight which you find disturbing.
"Don't worry. All you have to do is to report the case to us and we will follow it up as soon as possible," said Mr Tam with a smile, "It's always our pleasure to help the public to solve problems."
Upon receipt of complaints of that nature, the unit will request the complainant to fill in a form on television reception interference in order to obtain more information on the case before carrying out on-site investigation.
The form will be sent to complainants either by fax or by mail.
"We usually will send the mobile monitoring team to investigate within three days after receiving the form," Mr Tam added.
"In case like that, only on-site investigation can locate the source of interference, specially with the help of the portable spectrum analyser."
With regard to the spectrum analyser, staff of the unit have a mixed bag of feelings with this 30-pound equipment.
"The analyser is really great and useful as it can locate the source of interference which cannot be detected by equipment in our radio monitoring station," Mr Tam said.
"However, it weighs a ton. We will be out of breath after taking it through several storeys of a building which does not have any lift!" a staff of the unit said.
"On-site investigation is no easy task. Difficulty mounts when the rooftop has hundreds of aerials standing to greet you.
"No doubt, investigation will be much easier if the building has stalled communal aerial."
It usually takes the mobile monitoring team a half day to complete the investigation of a complaint.