Passive intermodulation products control and verification activities in a multicarrier L-band satellite system for mobile communications: The italsat F2/EMS experience

摘要: Abstract The Italsat F2 satellite has been launched in August 1996: addition to the domestic mission Ka-band it embarks L-band mobile payload (European Mobile System). Passive InterModulation (PIM) products generation is a very critical aspect for payloads working multicarrier environment, so EMS was designed cope with stringent PIM Products requirements, while spacecraft design, as derived from first flight unit, did not focus on aspects. basically caused by currents flowing components non linear voltage-current behaviour, and may occur at equipment, s/s system level. performance can be affected intermodulations generated two Tx carriers, that could fall Rx section; frequency plan, minimum order of these are 7th 9th. This paper describes activities carried out equipment up level eliminate much possible effects, results final test campaign. composed three main pans. pan deal technological aspects design production considered point view. second control strategy applied level, third part campaign presented.