A variometer is a pair of coils arranged in such a way that the axis of one can be rotated relative to the axis of the other. The coils are usually wired in series, and rotating one of the coils alters the mutual inductance.

Variometer Radio A new version of a classic design. BY LARRY LISLE original variometer, it is the outer coil that moves over the inner coils. As L2 is moved over 11, their mutual induc- tance is increased to the maximum. But when L2 is moved over L3, their inductances cancel out because L3 is connected backwards (with respect

Variometers measure the rate of change of altitude by detecting the change in air pressure (static pressure) as altitude changes. Common types of variometers include those based on a diaphragm, a vane (horn), a taut band, or are electric based.

So, what is a variometer and why would we need it? In almost all cases, a vertical antenna for 630m is going to be far shorter than the optimum length of 1/4 wavelength, also expressed as 90 degrees of length. Such a short antenna appears to be capacitive and requires an inductance in series to resonate the antenna.

A variometer is an electronic component consisting of two inductors (coils) connected in series, and physically arranged such that the coupling between the inductors can be varied. This causes the inductance of the total device to be variable over a considerable range.

The variometer is the variable inductor of the ATU. Using the Ball variometer allows to simplify the ATU design. RF relays switch on the coils of the variometer and it makes needed inductance. All of this allows simplify mechanical design of the ATU. Figure 1 shows schematic of the ATU. Picture 1 shows the Ball Variometer used in the ATU. It ...

2001年9月8日 · Variometer Design. A variometer consists usually of two coaxial coils, connected in series, where the coils relative position can be varied in some way. If L 1 and L 2 are the self-inductances of the first and second coil and L m is the mutual inductance between the two, the total inductance can be written as L tot =L 1 +L 2 ±2L m. The mutual ...

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Variometers can be used to tune antenna loading coils, coupler devices, or as a matching device.