(1) In cellphone terminology, a jammer is a device that
blocks transmissions by creating interference. The jammer emits signals in the
same frequency range that cell phones uses, and within the range of a jammer a
cellphone user may lose their signal.
(2) In satellite terminology it is a
mobile ultrahigh-frequency (UHF) high-power noise source that
can be used to jam satellite antennas or receivers.
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