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Eutelsat W4 Satellite Data Sheet (e. hemi. list)
Africa Payload (Russia Payload Below)
Satellite Characteristics Parameter Value(s) Notes
General:     
Satellite Manufacturer Alcatel Space Industries  
Launch Date 12/04/99  
Launch  Proton  
Projected Lifetime  >12 years   
Orbital Position  36º E ± 0.1 º  
Frequency Plan:    
Operational Transponders 12 31 channels, including all payloads.
Total Transponders  12 The W4 satellite has a total of 31 transponders. Nineteen channels are used by the Russian payload, which is independent of the African payload. The Russian payload is described in a Satellite Data Sheet below.
Frequency Accuracy ±1 x 10 -6 At satellite delivery.
Frequency Stability ±5 x 10 -7
±1 x 10 -6
±5 x 10 -6
Over any 24 hour period.
Over any month.
Over the min. operational lifetime.
Coverages:    
Nominal Transponder Power 57 W Wide Beam and Steerable Spot Beam Both coverages.
Polarisation  Single Linear All coverages.
Polarisation Discrimination 30 dB All coverages, receive and transmit. The exact value is dependent upon the location within the coverage zone.
Transponder Gain:     
Fixed Gain Mode: Precise operational gain adjustments are made according to the traffic configuration of the transponder.   
Gain Adjustment Range 15 dB  
Gain Step Size 1 dB  
IPFD for Saturation -(92 + X) to -(77 + X)  In dBWm-2. The value X is the G/T in dBK -1 in the direction of the location considered.
IBO Adjustment Range 0 - 10 dB  For a reduced Input Power Flux Density (IPFD) range of -(84 + X) to -(92 + X) dBWm -2 .
IBO Adjustment Step Size 1 dB  
Automatic Level Control Mode:    
Dynamic Range 15 dB  
IPFD for Saturation -(92 + X) to -(77 + X)  In dBWm-2. The value X is the G/T in dBK -1 in the direction of the location considered.
IBO Adjustment Range  0 -7 dB   
IBO Adjustment Step Size  1 dB   
Beacon:     
Number 1 Telemetry and ranging carrier.
Beacon Frequency 11 706.850 MHz Nominally active beacon frequency.
Selectable by ground command.
Frequency Stability  < ±50 kHz With respect to the nominal frequency.
Minimum EIRP  9 dBW Anywhere within the African coverage and within any geographical area served by the Steerable Spot Beam.
Polarisation  Horizontal  


Eutelsat W4 Satellite Data Sheet (e. hemi. list)
Russia Payload
Satellite Characteristics Parameter Value(s) Notes
General:     
Satellite Manufacturer Alcatel Space Industries  
Launch Date 12/04/99  
Launch  Proton  
Projected Lifetime  >12 years   
Orbital Position  36º E ± 0.1 º  
Frequency Plan:    
Operational Transponders 19 31 channels, including all payloads.
Total Transponders  19 The W4 satellite has a total of 31 transponders. Twelve channels are used by the African payload load, which is independent of the Russian payload.
Frequency Accuracy ±1 x 10 -6 At satellite delivery.
Frequency Stability ±5 x 10 -7
±1 x 10 -6
±5 x 10 -6
Over any 24 hour period.
Over any month.
Over the min. operational lifetime.
Coverages:    
Nominal Transponder Power 85 W  
Polarisation Dual Circular  
Polarisation Discrimination 27 dB Receive and transmit. The exact value is dependent upon the location within the coverage zone.
Transponder Gain:     
Fixed Gain Mode: Precise operational gain adjustments are made according to the traffic configuration of the transponder.   
Gain Adjustment Range 15 dB  
Gain Step Size 1 dB  
IPFD for Saturation -(92 + X) to -(77 + X)  In dBWm-2. The value X is the G/T in dBK -1 in the direction of the location considered.
IBO Adjustment Range 0 - 10 dB  For a reduced Input Power Flux Density (IPFD) range of -(84 + X) to -(92 + X) dBWm -2 .
IBO Adjustment Step Size 1 dB  
Automatic Level Control Mode:    
Dynamic Range 15 dB  
IPFD for Saturation -(92 + X) to -(77 + X)  In dBWm-2. The value X is the G/T in dBK -1 in the direction of the location considered.
IBO Adjustment Range  0 -7 dB   
IBO Adjustment Step Size  1 dB   
Beacon:     
Number 1 Telemetry and ranging carrier.
Beacon Frequency 11 706.850 MHz Nominally active beacon frequency.
Selectable by ground command.
Frequency Stability  < ±50 kHz With respect to the nominal frequency.
Minimum EIRP  9 dBW Anywhere within the African coverage and within any geographical area served by the Steerable Spot Beam.
Polarisation  Horizontal