Philex SLxB - Manual (Page 4)

If you are still experiencing reception
problems after the installation of your
SLxB Aerial Amplifier, please refer below.
Analogue Terrestrial TV
Snowy Picture
A faint, grainy or snowy picture is generally caused
by a weak signal. Normally the TV transmitter will
be a long way away. A possible improvement could
be made by reducing the aerial downlead losses,
installing a high gain aerial and by adding a low
noise masthead amplifier or signal booster. In a
small number of cases, a snowy picture can also be
caused by a TV signal that is too strong.
‘Herringbone’ Pattern
‘Herringboning’ is generally caused by too strong a
TV signal or by a local high power transmitter such
as CB, amateur or taxi radio. Your TV sound may be
affected as well as the picture. Using an attenuator
will reduce the gain of an aerial signal and improve
the overall picture.
Digital Terrestrial Television
Unlike analogue TV signals that can still be
viewed under weak signal strength conditions,
with digital terrestrial signals blocking/freezing
and/or loss of digital picture and sound can be
caused by insufficient digital signal and carrier to
noise ratio.
Similarly blocking and even a completely blank
screen with no sound can result if the input
signal to the set top box is too high. The digital
cliff refers to the rapid change from the picture
and sound being perfect, to disappearing
altogether.
When interconnecting equipment and to get the
best carrier to noise, place the digital terrestrial
television set top box as the first item in the
signal path followed by any video or satellite
receiver.
Fitting a high gain wideband roof aerial may also
improve the reception and signal quality.
Digital signals are generally immune to ghosting
or multipath reflections. They remain perfectly
receivable under conditions where an analogue
signal would suffer ghosting.
For specific help with DTT reception problems,
log onto www.dtg.org.uk.
Digital Satellite Television
With digital reception, a weak signal or
incorrectly aligned dish will cause the picture
and sound to block or disappear. Check both the
alignment of the dish and skew angle of the LNB.
Intermittent Connections
Make sure all RF cable to connector joints are
tight (both inner and outer) including all flyleads
and outlet plate connections.
Troubleshooting
© Philex Electronic Ltd. 2004
If problems persist, please contact
Philex Customer Careline: 08457 573 479
(Local rate – UK only)
Technical Support: http://technical.philex.com