Altech UEC DT 3900 - Manual (Page 25)

25
TROUBLESHOOTING
To help you diagnose what your problem is, it might be useful to know the
position of the digital transmitters, as well as the UHF channels used.
Important: DIGITAL TV SIGNALS ARE NOT AS
FORGIVING AS ANALOGUE SIGNAL. It tends to break into
blocks when a weak signal is present. It also presents no video
or audio during poor signal.
The table below provides guidelines with what possible problem can occur.
If it is a signal issue from your antenna you may have to call your local TV
installer.
Symptom Possible causes Solution(s) to try
You receive the analogue
channels perfectly, but not any
digital one. You live in a flat. Your collective antenna
system is not adapted to
terrestrial digital system. Contact your owner or managing
agent.
You receive the analogue
channels perfectly, but not any
digital one. Your geographical zone is
not covered by terrestrial
digital system yet. There is no solution immediately.
You will have to wait for your
zone to be covered.
You receive some digital
channels correctly, but some
others are badly transmitted, or
not transmitted at all.
Regarding the channels you
receive, the reception level is
not very high. The analogue
image is not perfect. You are too far from the
transmitter. You may call an antenna installer
to improve your signal or if you
think you are in a black spot you
may have to consider satellite TV
You receive all the digital
channels, but the reception is
disrupted sometimes (when
another electrical appliance
switches on, for instance). There are interferences 1 – Change the TV cable going
from the TV plug to your
terminal and try a shielded one.
2 – Switch the accessories
(dividers, derivative devices)
with shielded products.
3 – Change the cable between the
antenna and the plug.
Your reception is correct most
of the time, but gets disrupted
when it is raining, or sometimes
apparently at random. Your signal is weak and
on the threshold ( cliff
effect ) Get a more powerful antenna.