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2. Goniometer - Wikipedia

   en.wikipedia.org/wiki/Goniometer

   A goniometer is an instrument that either measures an angle or allows an object to be rotated to a precise angular position. The term goniometry derives from two Greek words, γωνία ( gōnía ) ' angle ' and μέτρον ( métron ) ' measure '. [ 1 ]

3. Bellini–Tosi direction finder - Wikipedia

   en.wikipedia.org/wiki/Bellini–Tosi_direction...

   This Royal Navy model is typical of B–T goniometers. The two sets of field coils and the rotating sense coil are visible.. A Bellini–Tosi direction finder (B–T or BTDF) is a type of radio direction finder (RDF), which determines the direction to, or bearing of, a radio transmitter.

4. Direction finding - Wikipedia

   en.wikipedia.org/wiki/Direction_finding

   This Royal Navy model is typical of B–T goniometers. The two sets of "field coils" and the rotating "sense coil" are visible. A key improvement in the RDF concept was introduced by Ettore Bellini and Alessandro Tosi in 1909 (U.S. Patent 943,960). Their system used two such antennas, typically triangular loops, arranged at right angles.

5. Positioning goniometer - Wikipedia

   en.wikipedia.org/wiki/Positioning_goniometer

   A positioning goniometer or goniometric stage is a device used to rotate an object precisely (within a small angular range) about a fixed axis in space. Its appearance is similar to that of a linear stage .

6. High-frequency direction finding - Wikipedia

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

   All of these devices took time to operate. Normally the radio operator would first use conventional radio tuners to find the signal in question, either using the DF antenna(s) or on a separate non-directional antenna. Once tuned, the operator rotated the antennas or goniometer looking for peaks or nulls in the signal. Although the rough ...

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