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HellasSAT Hellas-Sat 2 User Manual

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User's Manual

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Summary of Contents for HellasSAT Hellas-Sat 2

  • Page 1 User’s Manual ’ ’ September 2005...

  • Page 2: Document Structure

    User’s Manual INTRODUCTION The HELLAS SAT User’sl Manual gives a short description of the Hellas- Sat 2 satellite system and sets the procedures and calculations required for the user in order to access the satellite. It is offered to the service providers and potential users of the system with the aim to provide all necessary information for their systems planning and implementation of satellite services.

  • Page 3: General Characteristics

    M. East (S2) and S. Africa (S1). 1.3 FREQUENCY PLAN The frequencies and polarization arrangement of the Hellas-Sat 2 satellite transponders are shown in Figure 1. The fixed coverage antenna F1 receives signals in the band 13.75-14.00 GHz whilst the fixed coverage antenna F2 receives signals in the band 14.00-14.25 GHz.
  • Page 4 User’s Manual It is noted that, due to switching capabilities, channels 13-24(F1 antenna) or channels 37-48 (S2 antenna) may be downlinked in the band 12.50 to 12.75 GHz via the F1 antenna, selectable on a channel by channel basis. It is also possible to downlink S2 channels of the 14.25-14.50 GHz band via the F2 antenna in the 11.45-11.70 GHz band but in this case the F2 channels have to be downlinked via the S2 antenna in the 10.95-11.20 GHz band.
  • Page 5 User’s Manual Figure 1. Hellas SAT frequency Plan...
  • Page 6 User’s Manual COVERAGE MAPS Hellas–Sat 2 satellite provides four antennas for reception. The fixed coverage F1 and F2 antennas differ only in the shaping of the main reflectors. In practice they provide almost the same coverage over Europe, N.Africa and Middle East. Annex C provides the receive coverage areas in terms of G/T contours for F1, F2, S1 and S2.
  • Page 7 A 3 dB loss of power level is expected if linear polarization reception system is used by the station. This beacon is a two for one redundant unit and is used by the earth stations operators to track the Hellas-Sat 2 satellite.
  • Page 8 Above limitations do not apply in the case of a single carrier occupying the whole transponder bandwidth and therefore the TWTA can be driven almost to saturation. For a Hellas-Sat 2 TWTA, in different operational modes, the following total IBO/OBO values may be employed:...
  • Page 9 Transmission Plan. Any deviation from the approved transmission parameters requires special coordination and agreement by HELLAS SAT. Prior to accessing the Hellas-Sat 2 space segment capacity all transmit Earth Station operators have to submit to HELLAS SAT Operations Department Earth Stations approvals (Eutelsat, Intelsat, PanAmSat etc).
  • Page 10 User’s Manual ANNEX A HELLAS SAT NETWORK OPERATIONS CONTROL Satellite Access Procedures Purpose : This document defines the procedures all Earth Stations must follow in order to access Hellas Sat 2 Space Segment. Customer Access : In order to transmit to Hellas Sat 2 satellite, an authorization procedure should firstly take place.
  • Page 11 User’s Manual ANNEX B LINK BUDGET EXAMPLE Example: Link between Athens and London on beam F2 transponder 03, multicarrier operation. Transponder is set on FGM 09. Picture 2 shows a snapshot from Satmaster indicating the required fields needed from the satellite operator.

  • Page 12: Coverage Maps

    User’s Manual ANNEX C COVERAGE MAPS F1 Vertical Transmit 12,647 MHz EIRP Pattern 10.00 8.00 53.94 6.00 4.00 2.00 -8.00 -7.00 -6.00 -5.00 -4.00 -3.00 -2.00 -1.00 0.00 1.00 2.00 3.00 4.00 Theta*cos(phi) in Degrees F1 Horizontal Receive 13,768 MHz G/T Pattern 10.00 8.00 6.00...
  • Page 13 User’s Manual F2 Vertical Transmit 11,135 MHz EIRP Pattern 10.00 8.00 54.30 6.00 4.00 2.00 -8.00 -6.00 -4.00 -2.00 0.00 2.00 4.00 Theta*cos(phi) in Degrees F2 Horizontal Receive 14,021 MHz G/T Pattern 10.00 8.00 11.10 6.00 4.00 2.00 -8.00 -6.00 -4.00 -2.00 0.00...
  • Page 14 User’s Manual S1 Horizontal Transmit 12,729 MHz EIRP Pattern 0.00 -1.00 -2.00 52.16 -3.00 -4.00 -5.00 -6.00 -7.00 -8.00 -9.00 -8.00 -6.00 -4.00 -2.00 0.00 2.00 4.00 Theta*cos(phi) in Degrees S1 Vertical Receive 13,768 MHz G/T Pattern 0.00 -2.00 10° -4.00 5.94 -6.00...
  • Page 15 User’s Manual S2 Vertical Receive 14,476 MHz G/T Pattern 8.00 7.00 5.65 6.00 5.00 4.00 3.00 2.00 1.00 0.00 -1.00 -6.00 -4.00 -2.00 0.00 2.00 4.00 6.00 Theta*cos(phi) in Degrees...