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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

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