Category:Variometers and variocouplers
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A variometer is an adjustable air core RF inductor consisting of two coils of wire one inside the other, connected in series, with one coil pivoted so it can turn with respect to the other. When the axis of the two coils is parallel with the magnetic fields in the same direction, they add and the inductance of the device is maximum. When the movable coil is rotated so the magnetic field axes are not parallel, the inductance is reduced. When the movable coil is rotated 180° so the magnetic fields are in opposite directions, they cancel each other, so the inductance is small or zero.
A variocoupler is similarly constructed with two coils of wire, but the coils are not connected to each other but to separate circuits. So the device functions as an air core RF transformer with variable coupling.
Media in category "Variometers and variocouplers"
The following 10 files are in this category, out of 10 total.
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Ampco vario-coupler.jpg 419 × 347; 22 KB
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Antenna variometer 1945.jpg 332 × 305; 27 KB
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Basketball variometer 1922.jpg 1,130 × 723; 151 KB
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Honeycomb coil regenerative receiver.jpg 972 × 652; 197 KB
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Honeycomb coil vario-coupler.jpg 785 × 516; 51 KB
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Kugelvariometer.jpg 1,820 × 2,166; 549 KB
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Pancake vario-coupler 1922.jpg 809 × 617; 69 KB
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Variometer antenna loading coil for spark transmitter 1920.jpg 520 × 605; 89 KB
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Variometer.jpg 360 × 476; 20 KB
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Waloseum Nordsee-Urlaub Ostern 2011.jpg 600 × 800; 81 KB
