B+K precision SEFRAM 7861 Manuale utente

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Subject : Using the TV meter for a satellite installation

NASE786X-04-04

SEFRAM 7861 –7862 –7861HD –7862HD field strength meters enable the configuration of a terrestrial or satellite TV reception

system. This application note is dedicated for people who use the field strength meter for the first time. This manual provides an

application to setup a TV satellite (DVB-S) reception system correctly with a universal LNB-equipped satellite dish.

1) Configuration

Operating the instrument step by step

-Plug the LNB cable into the appliance.

- Switch the field strength meter on by pressing the key and wait that the presentation screen appears (screen with the

product reference number and its serial number).

-Press the Parameter key : , the following window appears on the display.

BNC input

Meter front panel

Satellite dish

Antenna

Presentation

screen

Sensitive wheel

Up/down and left/right keys

Sensitive keys

On / off

Direct access

function keys

Alphanumerical

keypad

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Parameter windows Navigation

Sensitive keys

This window enables defining the field strength meter parameters to receive a satellite signal. In Europe, the most used satellites have

already pre-recorded places(locations). As an example, this application has to allow the ASTRA 19.2°E satellite reception.

- Highlight the « Place » line with the up and down keys.

- Put the field strength meter on the 3rd place, named « ASTRA NUM »,with the right and left keys or with the sensitive wheel.

ASTRA NUM place

- Check that the field strength meter is in the same setup as in the previous example. This place contains enough programs of the

ASTRA 19.2°E satellite for this application (digital channels, horizontal/vertical polarity, high/low band).

- The « Thresholds » allow defining the limits for the level measurement. Their setups have already been installed but it is possible to

modify them (reserved to advanced users).

2) Adjust the satellite antenna

Now, you have to adjust the dish on the ASTRA 19.2°E satellite.

- First, switch the remote supply on (LNB supply). Press the « DiSEqC » key, the following window appears, go to the « Remote

supply » line with the up and down keys and choose ON in the menu with the sensitive keys. The « VDC » warning light in the front

panel flashes when the remote supply is switched on.

The menu for sensitive keys changes according to the line which is highlit. It enables modifying the selected parameter.

Table with programs

contained in the

place

Satellite frequency

band

Pre-loaded place

(satellite)

Highlit line

Menu for

sensitive

keys

Sensitive

wheel

Direction keys

Sensitives

keys

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Remote supply

- Press twice the Spectrum key: to open the check sat mode.

- Choose the satellite to receive. Highlight the « Satellite » menu and press the direction keys or turn the sensitive wheel to choose

« ASTRA1 19.2°E ». The field strength meter has to synchronise on the 4 satellite transponders so that the satellite dish is correctly

adjusted.

Check sat window

- Adjust the satellite dish until you hear the locking melody. This melody is audible as soon as a first transponder is locked. At the end of

the melody, beeps ring out. The more they are closer, the more the reception quality is good. Perfect the adjustment of the satellite dish

to obtain the best quality.

If the appliance is not synchronised on any transponder, the smiley is red.

If the appliance is synchronised and if the reception quality is average (<50%), it is orange.

If the appliance is synchronised and if the reception quality is good (>50%), it is green.

If the current consumption of the LNB is null (although the remote supply is activated), the head is not supplied and no

reception is possible. In this case, it is possible that the LNB is defective. Also check the cables and adapters that connec t

the LNB to the field strength meter.

LNB supply current

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4 synchronised transponders

- Adjust the LNB counter-polarisation. This operation consists in adapting precisely the LNB angle in order to reach a maximum

reception quality for a polarity, without interference with the opposite polarity. Observe the quality bargraph. Adjust the head until you

obtain a maximum quality.

Microwave head (LNB)

Lightly turn the

microwave head

Reception level

(%)

Quality (%)

Quality bargraph

Transponder

frequency

Band/polarisation

Transponder rate

Transponder

standard

Level bargraph

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Once the satellite adjusted, it is possible to see its spectrum.

- Press the Spectrum key : . The abscissa axis represents the frequencies and the ordinate axis the reception levels (in dBµV).

The spectrum displayed depends on the selected band and polarity.

Band

Low : 10 650MHz - 11 700MHz

High : 11 700MHZ - 12 750MHz

Polarity

Horizontal

Vertical

Notes : - A transponder contains several.

- The transponder width changes : it can be 27MHz, 36MHz or 72MHz.

Spectrum analyser –High band –Vertical polarity

Inactive transponder

If a single transponder doesn’t synchronise (quality=0), it is possible that its frequency is not valid anymore (in satellite,

the used frequencies are regularly modified). Use the following sensitive keys to replace the non valid transponders by

active transponders.

The transponders of the different satellites are listed on websites that are regularly updated, like

http://en.kingofsat.net/. For the example with ASTRA 19.2°E : http://en.kingofsat.net/pos-19.2E.php.

Transponder

setting

Colour

Level : Red

Frequency : Blue

Band/Polarity

High band=Hi

Low band=Lo

Vertical polarity=V

Horizontal polarity=H

Carrier : this

transponder

broadcasts TV

programs

Cursor that

indicates the

position

Transponder menu

access

Saved

transponder

- 6 -

- As programs have already been saved in the ASTRA NUM place, it is possible to put the cursor directly on the corresponding carriers.

To do it, press the sensitive key «Setup», then change the transponder with the direction keys or the sensitive wheel. Here, the blue

cursor is put on the carrier that broadcasts « CNN INT. ».

- To identify the satellite from the spectrum :

Press the « Autoset » key : .Then, a MPEG2 NIT table search is operating on the transponder that is currently selected. The

automatic recognition of the satellite is made in many steps :

- digital transponder search around the cursor position ;

- digital decoder locking ;

- MPEG NIT table reception waiting ;

- display : satellite name, orbital position, Network name and Network ID.

These instructions can take a few minutes. Once this process is finished, the following window appears in the middle of the spectrum:

Satellite identification

Some broadcasters don’t give information ( or badly) to the MPEG2 NIT table. The informations displayed at the acquisition end can be

erroneous. The following error messages can also appear.

- Impossibility locking on the transponder :

- Satellite identification failed : no NIT or wrong information, unlocking :

3) Measurements

- Press the « Measurements » key :

A new window appears on the display «Signal level». The first measures displayed correspond to the program previously selected on

the spectrum (here CNN INT). By selecting the « Setup # » line, then turning the sensitive wheel, it is possible to recall the other saved

programs( in the ASTRA NUM place) to operate the measurements.

Signal level window

- If necessary, check the transponder characteristics (frequency, band, polarity, standard, symbol rate ) on the website

http://en.kingofsat.net/satellites.php.

Example : transponder broadcasting CNN INT.

Astra 1M (19.2E) - 11778.00 V - Txp: 68 - Beam: Astra 1M

DVB-S (QPSK) - 27500 3/4 - NID:1 - TID:1068

Signal level

measure

Signal/noise ratio

measure

Transponder

characteristics

Transponder

frequency

Polarity

Symbol rate

Transponder

standard

Mini-spectrum

that represents

the transponder

Orbital position

Satellite name

Network name

Network ID

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- Analyse the measures :

Signal level

- V: represents the received signal level - VLNB : LNB supply voltage

(13V =vertical polarisation and 18 V = horizontal polarisation)

- C/N : means carrier/noise ratio - ILNB : LNB supply current

Thanks to different colours, a threshold system enables seeing the signal quality easily. On the display digital values and bargraphs

appear.

The thresholds are set up according to reference values. For an digital signal, the transponder measures have to correspond to the next

data.

For a digital signal, the V and C/N measures don’t guarantee the signal quality by themselves. It is imperative to measure the error

rates (BER/MER) to fully characterise the reception quality.

Error rates

To operate the error rate measurements :

Press for the second time the « Measurements » key:

A new window appears on the display : « DVB-S : BER/MER ».

DVB-S : BER/MER window

- Analyse the measures :

The BER (Bit Error Ratio) et MER (Modulation Error Ratio) measures are very important to qualify a DVB-S digital signal.

- CBER : error rate before the Viterbi correction ;

- VBER : error rate after the Viterbi correction ;

- UNC : lost packet number after the Reed Salomon decoder ;

- MER : modulation error rate ( generally equivalent to the C/N measure).

The bargraphs appears in colour according to the measures error :

Signal level at the antenna plug

47dBμV < V< 77dBμV

Signal / noise ratio

DVB-S standard : C/N > 11dB

Transponder

characteristics

Error ratio

measure

VBER > à 2E-4

(QEF : quasi error free)

Without lost packets

Lost packets (UNC)

Correct error rate

Minimum

threshold

Maximum

threshold

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For an installation of quality, follow the next reference values. Check that the measurements operated on the transponder correspond to

them.

Error ratios

Measure

BER

(

)

DVB-S

VBER <

2E-4

4) TV display

Caution : if you rely only on the picture, without taking the measures into account, you won’t have a correct system adjustment.

Press the key to display the transponder that corresponds to current measures.

If, in TV mode, the screen remains black but the NIT appears in the top right-hand corner of the screen, it means that the transponder

is well synchronised. Nevertheless, a subscription is necessary to see this not free TV program. The term « Conditional access »

indicates that the program can’t appear.

NIT –Conditional access

A transponder contains many TV programs. To access to a channel that is broadcasting in clear on the transponder, press the sensitive

key« Serv ». This button enables selecting the TV program to see. Choose a TV program with the direction keys and validate it with the

green validation key in the sensitive menu.

TV program choice TV window

Different application notes can be downloaded on our website ; they allow understanding more in details some functions of the field

strength meters (http://www.sefram.com/wwwFR/F_download.asp).

Product link : http://www.sefram.com/wwwFR/F_quick_search.asp?st=7861

The sign « < » before an error ratio value shows that there has not been any error (for example « <1E-8 » indicates an

error rate less than 1E-8).

Transponder change

(among those that are

saved in the place)

Program change

(in the current

transponder)

Transponder

NIT

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