Satellite Communications/SFD-IBO-OBO

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Question
Hello,

Assuming that our satellite network is operating properly what exactly takes place when we start increasing the TX power of a beam. Does the satellite transponder variable attenuator increase to make the transponder less sensitive? why? what happens to IBO, OBO, and eventually satellite EIRP to the user transceiver?

Answer
Hi Ali,
Satellite Uplink Earth Stations are supposed to follow certain ground rules in terms of Uplinking Power Total EIRP uplink etc. Once you arrive at a certain numbers through the Link Budget estimates, no one is allowed above the Margin levels at their will. All other parameters you referred are in the purview of Satellite Operator and gives IBO and OBO limits for safety of Transponder Hardware working limits. Nothing happens to IBO and OBO because they are NOT variable but specified.
If the proper operational parameters are NOT adhered by the User they will be penalised. Technically the design involves the limits of Satellite Transponders when in Orbit.
Cheers/GTRao

Satellite Communications

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TIRUMALA RAO G

Expertise

Satellite Communications Applications, Link Calculations, Teleports, Earth Stations,VSAT, Tracking, Mobile Communications, Next Generation Networks.

Experience

40 Years. Indian Space Research Organisation, PANAMSAT, Satellite Based VSAT Networks, IP Networks.

Organizations
ISRO, PANAMSAT, Engineering Institution for Higher Education (GVP College of Engineering), Consultancy.

Education/Credentials
Graduate in Electronics and Communication Engineering with Distinction. Guiding scholars for their Doctoral thesis in related areas in Academics.

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