Es'hail 2

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Es'hail 2
Es'hail-2 Mission (32040174268).jpg
Launch of Falcon 9 flight 63 carrying Es'hail-2
Mission typeCommunications
OperatorEs'hailSat
Mission duration15 years (planned)
Spacecraft properties
BusDS2000
Launch mass5,300 kilograms (11,700 lb)
Start of mission
Launch date15 November 2018 (2018-11-15Z), 20:46 UTC
Orbital parameters
Reference systemGeocentric
RegimeGeostationary
Inclination0.033[1]
Epoch60[2]
 

Es'hail 2 is a Qatari satellite, launched aboard a SpaceX Falcon 9 rocket on November 15, 2018.[3][4] Es'hail 2 was built by Japan's Mitsubishi Electric company, and will operate at 26° East longitude along a geostationary orbit to provide direct-to-home television services in the Middle East and North Africa region.[5] The satellite will feature 24 Ku-band and 11 Ka-band transponders to provide direct broadcasting services for television, government and commercial content distribution[6]. In addition to commercial services, the payload of Es'hail 2 includes a linear transponder with a bandwidth of 250 kHz and 8MHz for the amateur radio satellite service, with uplink on 2.4 GHz (S band) and downlink on 10.45 GHz (X band). [7]

Amateur radio transponders[8][edit]

Transponder U/L FREQUENCY [MHz] D/L FREQUENCY [MHz] LO [MHz] BW [MHz]
Pol Begin Center End Pol Begin Center End
NB RHCP 2400,05 2400,175 2400,3 V 10489,55 10489,675 10489,8 8089,5 0,25
WB RHCP 2401,5 2405,5 2409,5 H 10491 10495 10499 8089,5 8

"NB" Transponder (narrow band)[edit]

Linear Transponder for low power narrow bandwidth voice, morse and digital communication

  • preferred modes: narrow band modes like SSB and CW, PSK
  • 250 kHz allocated bandwidth
  • non-inverting bent-pipe transponder
  • Assumes 50 simultaneous 2-way carriers to serve 100 Users
  • X-Band Downlink (SAT-TV dish):
    • 90 cm dishes in rainy areas at EOC like Brazil or Thailand
    • 60 cm around around coverage peak
    • 75 cm dishes at peak -2dB
  • Downlink Polarisation on X-Band is Vertical !
  • Uplink Polarisation on S-Band is RHCP
  • Uplink transmitter 5-10W PEP (22.5 dBi antenna gain, 75cm dish)

The narrowband transponder is intended for conventional analogue and narrowband digital signals.

No transmissions should be made beyond the nominal edges of the transponder passbands. In particular, no operation should take place below the lower beacon nor above the upper beacon.

No uplinks should result in downlink signals that are stronger than these beacons. In the event that such signals are detected, they will be marked by a “LEILA” siren. When they have been marked by “LEILA”, operators should immediately reduce their uplink power (ERP).

No FM transmissions should be made to Es’hail-2 as these would use excessive power and bandwidth.

Although there is no formal bandplan, the following details are provided for initial guidance.

Uplink [MHz] Downlink [MHz] available Bandwidth [kHz] Notes
10489,550 – 10489,555 do not transmit Lower Beacon, 400 Bit/s BPSK or CW
2400,055 – 2400,100 10489,555 – 10489,600 45 CW Only
2400,100 – 2400,120 10489,600 – 10489,620 20 narrowband digimodes (500 Hz max. BW)
2400,120 – 2400,140 10489,620 – 10489,640 20 digimodes (2700 Hz max. BW)
2400,140 – 2400,190 10489,640 – 10489,690 50 mixed modes (2700 Hz max. BW)
2400,190 – 2400,295 10489,640 – 10489,795 105 SSB only
10489,795 – 10489,800 do not transmit Upper Beacon, 400 Bit/s BPSK or CW

"WB" Transponder (wide band)[edit]

Linear Transponder for Digital Amateur Television (DATV) and other highspeed data transmissions. First DATV transponder in space.

  • 8 MHz bandwidth
  • one or two DVB-S2 carrier in HD quality or more channels with SD or lower quality
  • assumes S-Band Uplink peak EIRP of 53 dBW (100W PEP into 2.4m dish)
  • X-Band Downlink (SAT-TV dish):
    • 90 cm dishes in rainy areas at EOC like Brazil or Thailand
    • 60 cm around around coverage peak
    • 75 cm dishes at peak -2dB
  • Uplink Polarisation on S-Band is RHCP
  • Downlink Polarisation on X-Band is Horizontal
  • DVB-S2 “beacon” from Qatar is planned with Live WebCam and promotional videos for Ham radio activities, visualisation, etc.
  • RF Bandwidth = 1.33 x Symbol-Rate = 1.33 x 2.5 MSymbols/sec = 3.33 MHz signal

See also[edit]

References[edit]

  1. ^ https://www.karhukoti.com/webtracker?s=43700
  2. ^ https://www.karhukoti.com/webtracker?s=43700
  3. ^ "SpaceX on Twitter". Twitter. Retrieved 2018-10-17.
  4. ^ "SpaceX on Twitter". Twitter. Retrieved 2018-11-15.
  5. ^ Clark, Stephen. "SpaceX selected for launch of Qatari satellite – Spaceflight Now". Retrieved 2016-03-28.
  6. ^ "Es'hail-2 Communication Satellite". Retrieved 2019-01-06.
  7. ^ ""Es'hail-2 Geostationary Satellite Carrying Amateur Radio Payload Launched"". American Radio Relay League. 2018-11-15.
  8. ^ "Es'hail-2 / AMSAT Phase 4-A". Retrieved 2019-01-06.