A Chinese cargo ship repeatedly intruded into Taiwan’s contiguous and sovereign waters for three months before allegedly ...
Called Es’hail-2 / AMSAT Phase 4-A / Qatar-OSCAR 100, it lies in the geostationary orbit at 25.9° East and has a transponder with ... the radio signal is created at a lower frequency (in ...
Passive Integrated Transponder (PIT) tags help scientists ... To activate the tag, a low-frequency radio signal is emitted by a scanning device that generates a close-range electromagnetic field.
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