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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
Antenna
BNC input
Satellite dish
Meter front panel
Presentation
screen
Sensitive keys
On / off
Direct access
function keys
Alphanumerical
Up/down and left/right keys
keypad
Sensitive wheel
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.
- 1 -
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Summary of Contents for BK Precision SEFRAM 7861
- Page 1 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.
- Page 2 Parameter windows Navigation Highlit line Sensitive Direction keys Menu for wheel sensitive keys Sensitive keys Sensitives keys The menu for sensitive keys changes according to the line which is highlit. It enables modifying the selected parameter. 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).
- Page 3 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.
- Page 4 4 synchronised transponders Reception level Quality (%) Level bargraph Quality bargraph Transponder frequency Band/polarisation Transponder rate Transponder standard - 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.
- Page 5 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. transponders different satellites...
- Page 6 - As programs have already been saved in the ASTRA NUM place, it is possible to put the cursor directly on the corresponding c arriers. 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 «...
- Page 7 - Analyse the measures : Signal level : represents the received signal level - VLNB : LNB supply voltage (13V =vertical polarisation and 18 V = horizontal polarisation) : 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.
- Page 8 For an installation of quality, follow the next reference values. Check that the measurements operated on the transponder correspond to them. Error ratios Measure DVB-S VBER < > 2E-4 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).
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