Side konspekt 2020 / eksami kordamisküsimused
– -110dBm IM signal caused by two +43dBm tones
Or relative to only one of the test tones (dBc)
– The same specified as -153dBc IM level. – Units of dBc are relative to
the largest of the incident carriers
Kuidas vähendada?
Passive components at least -155dBc at 2x 20W (43dBm)
For terminations use cable absorbers
Use 7/16 type connectors
Connectors tightened with correct torque, no more no less
Low PIM jumper cables with soldered connectors
Use all connectors and tools from the same manufacture
No mechanical stress on RF parts
All RF interconnections cleaned as specified by the manufacturer
66.Mis põhjustab passiivset ristmodulatsiooni (PIM – Passive
Intermodulation)
Põjustajad:
Poor mechanical junction in the RF path;
RF components with materials which exhibit some level of hysteresis
(eg. Stainless steel)
Contaminated surfaces or contacts within the RF path. (metallic particle,
annaabi.ee 
