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signal parasite
commun.	clutter
comp.	noise signal; drop-in (signal); disturb signal; interference signal; jamming signal
earth.sc., mech.eng.	spurious signal
el.	interfering signal; parasitic signal; interferer
nucl.phys., радиоакт.	ghost signal
signaux parasites
acoust.	clutter
commun.	background clutter
UN	Ground clutter

signal parasite: 13 phrases in 3 subjects

Communications	10
Electronics	2
Transport	1