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01-02/2015

TELE-audiovision.com/15/01/

spaun

30

TELE-audiovision International — The World‘s Leading Digital TV Industry Publication

— 01-02/2015

TELE-audiovision.com

TEST REPORT

LTE Filters

SPAUN SLTE 30, SLTE 60 and SLTE 90

Effectively stops interferences from

LTE/4G mobile signals

Easily Remove LTE Interference

As the 4G mobile commu-

nication is becoming more

and more common today

all over the world, LTE data

transmission may some-

times interfere with normal

digital terrestrial TV recep-

tion. LTE channels are locat-

ed in the frequency spec-

trum just above terrestrial

TV channels. You may en-

counter such interference in

the form of a loss of sound,

blocky or pixelated images

or loss of some channels.

These symptoms might be

experienced occasionally or

all of the time.

Of course, there might be

more causes of such symp-

toms, for example: mis-

aligned antenna or unrelia-

ble coax cable connections.

However, if your antenna is

aimed correctly, cable in-

stallation also looks OK, and

the problem exists first of

all for higher frequency TV

channels (higher channel

number), LTE transmissions

should be suspected.

Fortunately, there is a

very simple solution that

everybody can use: passive

low pass filter inserted in a

cable connection between

an aerial and a DVB-T or

DVB-T2 receiver. We have

described one such filter:

SPAUN SMF 790 LTE stop

band filter in the 04-05/2012

issue of TELE-satellite.

Since then, SPAUN have ex-

panded their product line by

adding three other models:

SLTE 30, SLTE 60 and SLTE

90, and we decided to have

a closer look at them.

As always with SPAUN

products, they are perfectly

finished off, have very clear

markings and every product

has a leaflet with techni-

cal advices and short form

product specification. The

products differ in connector

types: F or IEC and female-

female or female-male con-

figuration. So, depending on

your installation you may

want to chose this or that

model. They also differ in

frequency response.

Let’s first look at the

SLTE 30: this filter does not

have a very sharp roll-off,

in other words, its signal

attenuation increases with

frequency at a moderate

rate. However, it can reach

more than 60 dB attenua-

tion. It has a classical low

pass filter characteristics.

The filter has a female F

connector on one end and

male F connector on the

other. So, it is possible to

install it directly on your