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2. Loading coil - Wikipedia

   en.wikipedia.org/wiki/Loading_coil

   When so loaded the antenna presents a pure resistance to the transmission line, preventing energy from being reflected. The loading coil is often placed at the base of the antenna, between it and the transmission line (base loading), but for more efficient radiation, it is sometimes inserted near the midpoint of the antenna element (center ...

3. High-frequency Active Auroral Research Program - Wikipedia

   en.wikipedia.org/wiki/High-frequency_Active...

   HAARP began operating in 1999 as a 6 × 8 (= 48) antenna array at 0.96 MW, expanding in 2007 to a 12 × 15 (=180) array of 180 antennas with 360 radio transmitters at 9.6 MW. It covers 14 ha near Gakona, about 250 km northeast of Anchorage. Its beam direction is anywhere within 30° of zenith. [16] [17] HAARP antenna array

4. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   The category of simple antennas consists of dipoles, monopoles, and loop antennas. Nearly all can be made with a single segment of wire (ignoring the break made in the wire for the feedline connection). [citation needed] Dipoles and monopoles called linear antennas (or straight wire antennas) since their radiating parts lie along a single ...

5. Waves (Juno) - Wikipedia

   en.wikipedia.org/wiki/Waves_(Juno)

   The Waves instrument is designed to help understand the interaction between Jupiter's atmosphere, its magnetic field, its magnetosphere, and to understand Jupiter's auroras. [4] It is designed to detect radio frequencies from 50 Hz up to 40,000,000 Hz (40 MHz), [ 5 ] and magnetic fields from 50 Hz to 20,000 Hz (20 kHz). [ 6 ]

6. Near-field magnetic induction communication - Wikipedia

   en.wikipedia.org/wiki/Near-field_magnetic...

   A near-field magnetic induction (NFMI) communication system is a short range wireless physical layer that communicates by coupling a tight, low-power, non-propagating magnetic field between devices. The concept is for a transmitter coil in one device to modulate a magnetic field which is measured by means of a receiver coil in another device.

7. Automatic direction finder - Wikipedia

   en.wikipedia.org/wiki/Radio_Magnetic_Indicator

   A radio magnetic indicator (RMI) is an alternate ADF display providing more information than a standard ADF. While the ADF shows relative angle of the transmitter with respect to the aircraft, an RMI display incorporates a compass card, actuated by the aircraft's compass system, and permits the operator to read the magnetic bearing to or from ...