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A2B Electronics Multibox 6T International User Manual

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User manual Multibox6T International 

655603.03 rev A 

 Page 1 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

•  Receives 6 free to air digital services  
•  Converts 6 digital channels to high quality 

analogue and feeds them down existing 
analogue distribution systems 

•  Allows all existing TVs & VCRs to receive the 

chosen 6 Digital channels in analogue 

•  Compatible with standard digital STBs for Pay 

TV (UHF Loop through) 

•  Easy installation 
•  Low power consumption 

 

Multi

Box 

User Manual 
Multibox 6T  
International 

for Digital Television on 
all your TVs... 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 2 

1  Contents 

 

 

Contents ............................................................................................................................................. 2 

Unpacking the Multibox................................................................................................................... 2 

Introduction....................................................................................................................................... 3 

Information about digital terrestrial television.......................................................................... 3 

Mounting (where and how to mount the Multibox).................................................................... 3 

Connectors and buttons .................................................................................................................. 4 

Installation......................................................................................................................................... 4 

7.1 

Installation in a MATV network .............................................................................................. 4 

7.2 

Automatic installation and channel search ......................................................................... 5 

7.3 

TV channel search .................................................................................................................... 5 

Menu settings .................................................................................................................................... 6 

8.1 

Basic settings............................................................................................................................. 6 

8.1.1 

Information ....................................................................................................................... 6 

8.1.2 

Choosing channels (Channel 1 to 6).............................................................................. 6 

8.1.3 

Channel search.................................................................................................................. 7 

8.1.4 

National.............................................................................................................................. 7 

8.1.5 

National – subtitling ........................................................................................................ 7 

8.1.6 

National - language.......................................................................................................... 8 

8.1.7 

National – channel search target .................................................................................. 8 

8.1.8 

National – menu language............................................................................................... 8 

8.1.9 

National – presets............................................................................................................. 8 

8.2 

Advanced settings..................................................................................................................... 9 

8.2.1 

Aspect ratio (Picture format) ........................................................................................ 9 

8.2.2 

Output channels ............................................................................................................... 9 

8.2.3 

Quality................................................................................................................................ 9 

8.2.4 

 Auto mux search............................................................................................................ 11 

8.2.5 

Channel indicator........................................................................................................... 11 

8.2.6 

Audio output type .......................................................................................................... 11 

Software (firmware) update......................................................................................................... 11 

10 

Connecting a Set Top Box (STB)............................................................................................... 12 

10.1  Connecting a Set Top Box with the Multibox .................................................................... 12 

11 

Support and trouble-shooting................................................................................................... 13 

11.1  Trouble-shooting..................................................................................................................... 13 

12 

Technical specification.............................................................................................................. 14 

13 

Notes............................................................................................................................................. 15 

14 

Declaration of Conformity ........................................................................................................ 16 

 
 
The Multibox is supplied with the following accessories for quick and easy installation 
 

1. Multibox 6T International  
2. Power adaptor 
3. User Manual 
4. Quick Guide 
5. Drilling pattern 

 
 
 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 3 

2  Introduction 

 

 
Thank you for choosing the Multibox 6T International, a quality product developed and 

manufactured by A2B Electronics. 
 

The Multibox is a unique solution that allows you to watch digital television on all TV sets. 
The Multibox receives all terrestrial free to air programs, and retransmits 6 channels 

simultaneously to all TV sets and VCRs, that are connected to the analogue distribution 
system.  

 

This User Manual describes how to install and connect the Multibox quickly and easily. 
Installers may wish to refer to the Quick Guide for a brief description of how to get started.  
In the unlikely event that you experience any difficulties please refer to Chapter 11, Support 

and Trouble Shooting. 

 
 

3  Information about digital terrestrial television 

 

 
Today there are many digital terrestrial channels available that are broadcasted free to air. 

The Multibox is a unique solution that makes it possible to continue watching TV on all the 
TV sets even after Digital Switchover. The Multibox can receive all free digital terrestrial 
channels.  

 
The free to air channels are transmitted in muxes. A mux (multiplex) is a package of 
channels that are transmitted on the same frequency. Frequently a mux will contain both 

free to air and pay TV channels.  
 
The Multibox receives transmissions from 4 muxes, and retransmits 6 of the free to air 
channels in analogue form with Nicam/A2 stereo to all connected receivers (TV-sets, VCR’s 
etc.). In the Multibox there is also a loop through of all digital muxes , which makes it 

possible to connect a Set Top Box (STB) for Pay-TV after the Multibox. For more information 
please refer to 

www.a2b.se

  

 

 

  

4  Mounting (where and how to mount the Multibox) 

 

 
 
The Multibox should be mounted correctly to ensure 
excellent performance over a long period of time.  

 
Please note that it is important to mount the Multibox 
vertically for correct airflow. Attach the Multibox to a 
suitable surface either by using the holes on the back 
side or the ones on the left or the right side. We 
recommend that you use the attached drilling pattern 
for drilling, and use 2 screws (length depending on Surface) 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 4 

 

Mount the Multibox so that it is as easy as possible to connect the cables. If the Multibox is 
installed in the attic, mount it close to the aerial. Also, make sure you have a 230V AC power 
outlet. For more information about how to install the Multibox please refer to Chapter 6 

Installation.  

 

5  Connectors and buttons 

 

 
 
Connectors and buttons 

 

1.  Aerial in 
2.  TV out 
3.  DC-power (12 V) 

4.  RS-232 Serial port for updates

1)

 and 

     communication between units  
5.  LED operation indicator 
6.  Arrow up for menu navigation 

7.  Arrow down for menu navigation 
8.  OK button for showing menus and  

for menu choice 

 
 

1) See 

www.a2b.se

 for information about new software.

  

 

 

6  Installation 

 

6.1  Installation in a MATV network 

 
The Multibox should be connected as close as 
possible after the aerial and after an antenna 
amplifier where necessary (if for example there is a 
very long cable from the aerial or the aerial signal is 
weak). The output signal of the Multibox should be 
connected into the existing network and if necessary 
to an amplifier. 
(The output level from the Multibox is typ. 80 dBuV) 

 

Note! Do not use any other power adaptor than the 
original with the Multibox.  

 

TV 

TV 

TV 

TV 

Multibox 

Splitt

er 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 5 

 

6.2  Automatic installation and channel search 

 

The Multibox will automatically start a channel search when it is connected to a TV aerial 
and the power adaptor is connected. In some countries the Multibox will search for specified 
TV channels and put them out on the preset frequencies as shown below. If The Multibox is 

installed in a country where no presets exists, you must manually stop the channel search 

when the channel search process is completed, otherwise it will start a new channel search 
after 15 seconds. After the channel search has finished you have to choose which 6 channels 
you want, by manually selecting them from the Channel list ( see Chapter 8.1.2 ) 

 

 
Program Channel  Frequency 
Channel 1  E21 

471,25 MHz 

Channel 2  E29 

535,25 MHz 

Channel 3  E56 

751,25 MHz 

Channel 4  E59 

775,25 MHz 

Channel 5  E63 

807,25 MHz 

Channel 6  E67 

839,25 MHz 

 

To be able to see the channel search, connect a portable TV or a measurement instrument 
with analogue display tuned to channel E21 ( Channel 1 at the Multibox ). 
 

The channel search takes about 60 seconds. When the channel search is complete, and there 
are signals from the programs, the LED on the Multibox switches from red to green or you 
have to stop the channel search by pressing the OK button. 
 

6.3  TV channel search 

 

Once the channel search on the Multibox is complete you will 
need to do a channel search on the connected TVs and VCRs. Many 
TV sets have an automatic channel search facility - for more 

information please refer to the TV and VCR User Manuals.   
NOTE!  It may be necessary to choose new output frequencies for 
channels 1 to 6 to ensure that there will be no interference with 
local transmitters.  
 
The output Channels transmitted by the Multibox are highlighted by a text box with 
“Multibox 1” to ”Multibox 6” in the upper right corner of the screens of all connected TV 
sets. This text box will disappear automatically after 8 hours. You can also remove the text 
box manually via the menu system of the Multibox; see Chapter 8 Menu settings, for more 
information.  
 
If you need help to install the Multibox, please visit our web site for more information:  

www.a2b.se

 

 

LED 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 6 

 

 

7  Menu settings 

 

 
 
The Multibox has a menu system for changing  

settings and functionality. The menus are shown on the TV 

screen at “Multibox 1” channel (default channel E36). Press 
the OK button on the Multibox (see Chapter 6 Connectors 

and buttons) to display the menus. The picture to the right 
shows the main menu. Use the arrow up and arrow down 

buttons on the Multibox to navigate the menus. Exit the 
menu by moving the indicator to “Return” and then press 

the OK button on the Multibox. 
 
 

7.1  Basic settings 

 
In the basic settings you will find information about the Multibox or choose which channels 

that should be retransmitted by the Multibox or start a new channel search.  

 
 
 
 

7.1.1  Information 

 
The information box displays the hardware version and the 
software version of the Multibox. It also displays the serial 
number of the Multibox.  
 
 
 
 

7.1.2  Choosing channels (Channel 1 to 6) 

 
This menu is used for selecting which digital television 
channels are transmitted by the Multibox on Channel 1 to 
Channel 6.   

•  Move the indicator (using the arrow buttons on the 

Multibox) to the Channel you want to change.   

•  Press the OK button on the Multibox to show all the 

received digital television channels.  

•  Select the digital television channel and press the OK 

button again. 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 7 

 

7.1.3  Channel search  

 

The first time the Multibox is installed it will do an automatic channel search to tune in the 
preset channels (see chapter 7.3). In some countries this is not done automatically so you 
have to manually stop the search process and choose your 6 channels from the channel list 

( see chapter 8.1.2 ). This menu can also be used for starting a new channel search, if for 

example, the Multibox is moved to a new location. 
 
Connect the TV aerial before starting the channel search. 

To follow the channel search process tune a TV channel to 

channel E21 (471,25 MHz). During the channel search all 
the signals that come from the aerial are shown at the 

bottom of the screen by individual channels (frequencies) 
and signal strength. When the Multibox identifies them as 

free digital muxes the bar turns to green (see Chapter 4 for 
more information about muxes). The muxes with free to air 

channels have green, yellow or red indicators, depending 
on the signal quality, and the muxes with only Pay TV channels have pink bars. Please refer 

to Chapter 8.2 Advanced Installation, for more information about signal quality and how to 

adjust the TV aerial. 
 
All the free channels that are received and identified are displayed in the background. 

 

7.1.4  National 

 
This menu is used to change the national settings. You can 
choose the preferences for subtitling, audio language, 
channel search, menu language and presets. 
 
 
 

7.1.5  National – subtitling 

 
Use this menu to set the preferences for subtitling. It is 
possible to set the type of subtitling, choose the subtitle 
language and select between DVB-T or teletext subtitling, 
and set the teletext character set. This menu can also be 
used to switch subtitling on or off. 
 
 

7.1.5.1  Type 

 

Use this menu to choose between normal subtitling or 
special subtitling for the hearing impaired. This offers 
enlarged subtitles and colour coded text. Alternatively all 
the subtitling can be switched off. The Multibox is preset to 
“None”. 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 8 

 

 

7.1.5.2  Priority 

 

Subtitling can be transmitted in different formats; via 

“teletext subtitling or “DVB subtitling”. The format is 
automatically selected by the Multibox. Sometimes both 
formats are transmitted and the Multibox then 

automatically chooses the format according to the priority 

set here. If you experience any issues with subtitling use 
this option to change the format. 

 
 

7.1.6  National - language 

 
This menu is used to set the preference for audio language, 

where a TV program is broadcasted in more than one 
language. 

 
 

 

7.1.7  National – channel search target 

 
In this example, the Multibox is preset to perform a United 

Kingdom channel search.  
 
 
 
 
 

7.1.8  National – menu language 

 
This menu is used to set the preference for the language 
used in all the menus in the Multibox. 
 
 
 
 
 

7.1.9  National – presets 

 

Use this menu to automatically select subtitling, audio 
language and menu language by language preference. 
 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 9 

 

7.2  Advanced settings  

 
In the advanced settings menu you will find settings for 

Aspect ratio, Output channels, Quality, Auto MUX search, 
Channel indicator and Ouput audio type.  

 

 
 
 

7.2.1  Aspect ratio (Picture format) 

 

The picture format can be set to 4:3 or 16:9 (Widescreen). 
If the main TV is 4:3, choose 4:3 to watch 4:3 programs in 

full screen and widescreen programmes (16:9) in the 
letterbox format where the full width of the picture is 

shown and the top and bottom of the picture are black.  
Choose 16:9 if the main TV is widescreen to watch 16:9 

programmes in full screen. 
 

 

7.2.2  Output channels  

 
Use this menu to choose the output channels for the 
Multibox. It is possible to choose all channels between 470 

to 862 MHz (E21 to E69). NOTE! It is not possible to choose 
adjacent channels. 
 
 
 

7.2.3  Quality 

 
This menu is used to test the signal quality and the aerial 
reception quality. It may be necessary to adjust or upgrade 
the TV aerial to ensure good picture and sound on all 
channels. For more information see Chapter 8.2.3.1 
Reception. 
 
The Multibox has an inbuilt spectrum analyser to help 
optimise the aerial installation. For more information see 
Chapter 8.2.3.2 Antenna Quality.

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 10 

 

7.2.3.1  Reception 

 
Use this menu to measure the reception quality of each 
channel. There are two Reception sub menus, “Reception” 

for Channel 1, 2 and 3 and “Reception 2” for Channel 4, 5 

and 6. If these are not optimal the picture and sound 
quality may deteriorate in poor reception conditions and it 
may be necessary to adjust the aerial. The information 

refers to the 4 installed muxes for the 6 channels. 

 
The sub menu shows the channels numbers and frequencies 
of the installed muxes. Good reception quality requires a 

strong incoming signal. For more information on the 

optimal signal strength see Chapter 8.2.3.2 Antenna Signal. 
It may be necessary to adjust the aerial for optimal signal 
strength. The signal quality C/N (Carrier to Noise) value is 

a measurement of the relationship between the aerial 

signal and disturbance in the channel. This should be higher 
than 20 dB for a 64 QAM signal or 16 dB for a 16 QAM signal. 

The BER (Bit Error Rate) measures the ratio of the number 
of faulty bits received to the total number of bits received. The BER should be as low as 

possible and less than 2.00E-4 (2*10

-4

) to ensure good quality picture and sound.  

 
If all the parameters for the incoming signal are good but there are still problems with the 
picture or sound quality it is likely that there is a problem with the cable that connects the 
TV sets and VCRs to the Multibox. 
 
 

7.2.3.2  Antenna quality 

 
The Multibox has an inbuilt spectrum analyser. This shows 
the level of the incoming signals on the UHF band (channels 
21-69, 470-862 MHz). The picture to the right shows the 
signal level of the incoming channels. The chosen muxes for 
the installed channels are green. The recommended level 
for the incoming channels is between 45 dBμV and 75 dBμV 
(between the 2 red horizontal lines). 
 
Check that the green columns are between the 2 red 
horizontal lines. If not it may be necessary to adjust or 
upgrade the TV aerial or to attenuate the incoming signal. 
 
The red columns indicate the chosen output channels for the Multibox. If there are muxes in 
the red columns you should change the output channel to another frequency (see chapter 
8.2.2 Output channels). 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 11 

 

7.2.4   Auto mux search 

 

The Auto mux search is preset to On. The Multibox will 
automatically search for a tuned in channel if that channel  

 

is moved to another frequency. 

 

7.2.5  Channel indicator  

 

The Channel indicator can be switched between on and off. 
When the channel indicator is on, a text box with ”Multibox 

1” to “Multibox 6” will be shown in the upper right corner 
of the picture. After installation the channel indicator is 

automatically switched on for 8 hours to make it easier to 
do a channel search on the TV. During normal operation, 

the channel indicator is off.  

 

7.2.6  Audio output type 

 

In this menu you can choose between different audio types 
such as Nicam B/G, Nicam I, A2 B/G, A2 D/K or A2* D/K. 

Place the marker at wanted audio type ( Nicam, A2 or A2* ) 
and press the OK button, then select the wanted audio 
system by moving the cursor and press the OK button. 

 

 
NOTE!
 It will take a few seconds for the settings to take 
effect, so please wait until the menu returns to the 
previous menu before you continue with other settings.  

 
 

8  Software (firmware) update 

 
 
Check first if you have the latest firmware ( see Chapter 8.1.1, Information ). The latest 
firmware version can be found at 

www.a2b.se

 , from where you can download it.  

 
Once you have downloaded the new firmware to your PC you have to disconnect the “link 
cable” from the upper serial connector on the Multibox. Then connect the PC to the upper 
serial connector on the  Multibox using a null modem cable. Make sure that the Multibox  
is switched on.  
 
Click on the new firmware icon on your PC and you will be asked if you want to continue. 
Click on OK and the download will begin to the main board.  
 
After this is finished connect the “link cable” again between the main board and the sub 
board. Now the main board will download the new firmware to the sub board and if you are 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 12 

connected to a TV or instrument tuned in to the output frequency for “Channel 1” you 

can follow the process on that screen. 
When the upgrade is complete the Multibox will automatically go back into normal 
operational mode. 

 

9       Connecting a Set Top Box (STB) 

 

 

9.1  Connecting a Set Top Box with the Multibox 

 

 
The Multibox has a loop-through facility that makes it possible to connect a digital Set Top 
Box (STB) to the Multibox to watch digital terrestrial Pay TV channels. In most cases you will 

need a STB with a card reader and a Smart Card.  

 
 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 13 

 

10 Support and trouble-shooting 

 

 

If you need more help with installation, please contact your local distributor. You can also 

find more information on our web site: 

 www.a2b.se

 

 

10.1 

Trouble-shooting 

 

 
 
 

Error 

Analysis 

Probably cause 

Action 

No sound or picture

 

Indicator LED red

 

No or poor signal 
from the aerial

 

Adjust or replace the 
aerial for a better 
signal 

 

No sound or picture

 

 

Indicator LED green

 

 

Channel search not 
done on TV set 

 

Do a channel search 
on the TV set 

 

The TV picture shows 
a menu

 

 

Menu not switched off 

 

 

Select Multibox 1 on 
the TV. Go to 
”Return” with the 
arrow buttons, then 
press the [OK] button 
on the Multibox 

 

Flickering sound

 

 

Is the picture OK?

 

 

Low signal level from 
the aerial

 

 

Adjust or replace the 
aerial for a better 
signal 

 

 

Flickering sound and 
blockings in the 
picture

 

 

 

Low signal level from 
the aerial

 

 

Adjust or replace the 
aerial for a better 
signal 

 

 

Flickering sound and 
blockings in the 
picture

 

 

Is the Multibox lying 
down?

 

 

Overheating due to 
faulty mounting

 

 

Mount the Multibox  
vertically according to 
the instructions

 

 

No stereo sound

 

 

Does the TV set have 
stereo? 

 

 

No Nicam/A2 stereo 
decoder in the TV

 

 

Consider purchasing 
a TV with Nicam/A2 
stereo sound

 

 

Flickering sound 
and/or blockings in 
the picture

 

 

Are you using an 
aerial signal 
amplifier? 

 

The input level to the 
Multibox is too high 

 

Remove the aerial 
signal amplifier 

 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 14 

 

11 Technical specification 

 

 

 

6 x DVB-T TERRESTRIAL RECEIVER 
 
Frequency range  470-862 MHz 

Connector 

Type IEC female, 75 ohm 

Input level range  36 – 80 dBμV  
Bandwidth 8 

MHz 

 
 

MPEG DECODER - VIDEO 
Standards PAL 

Aspect ratio 

Letterbox, Pan/Scan,  

Teletext 

Insertion in VBI 

Subtitling  

Teletext or DVB subtitling 

 

 
 

MODULATOR 

6 modulators 
Modulation standard 

PAL B/G, D/K, I 

Audio  

FM-mono, 

NICAM 

stereo, A2 stereo, A2* stereo 

Output channels 

 

UHF (E21- E69)  

  

Pre-selected: 

 

 

Channel 1  E21 

471,25 MHz 

Channel 2  E29 

535,25 MHz 

Channel 3  E56 

751,25 MHz 

Channel 4  E59 

775,25 MHz 

Channel 5  E63 

807,25 MHz 

Channel 6  E67 

839,25 MHz 

 
Output level 

 

typ. 80 dBuV, fixed 

Loop-through of  

digital signals 

 

UHF 470-860 MHz, - 5dB 

 

 

RF output connector 

Type IEC, 75 ohm 

 
OTHERS 
Power supply  

 

12 VDC (9-16 V) Use only the AC/DC adaptor delivered with the 
Multibox 

Power consumption  

Typ. 27 W 

Size 

 

180x190x65 mm  (excl. connectors)  

Weight 

 

Approx. 1,5 kg  

Operating temperature  -20 to +45°C 
 
 
We reserve the right to technical changes without prior notice. 
 

 


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User manual Multibox6T International 

655603.03 rev A 

 Page 15 

12      Notes 

 
 
 
 
 
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User manual Multibox6T International 

655603.03 rev A 

 Page 16 

 

13     Declaration of Conformity 

 

 

 

Declaration of Conformity 

EC Directives 

 
 

The Multibox6T International complies to the relevant parts of the directives and standards 
below.  
 

Directives 
 

•  Electro magnetic compatibility directive (EMC) 89/336/EC 

•  Low voltage directive (LVD) 2006/95/EC 
•  CE-marking directive 93/68/EC 
 
 

Standards 
 
EMC:   Emission - EN61000-6-3:2001 
 Immunity 

EN61000-6-1:2001 

 

     Safety :  EN 60 950-1:2001 

 
The complete Declaration of Conformity can be found at www.a2b.se 
 

 
 

 
 
 
 
 
 
 
 
 
 
 

 

 
 
 
 

 

Further information on 

www.a2b.se