Abstract
the twin-channel Visual Direction Finder for the navigation of ships has been installed on a great number of vessels of different nations. Furthermore, the twin-channel principle is used for monitoring devices (especially for short waves) and for atmospherics direction finders. In order to be able to meet the requirements for the different types of equipment used for different purposes in a suitable and rational way, the Plath All-Frequency Visual Direction Finder has been developed. This direction finder consists of a main device being the same for all frequencies and incorporating the indicator unit, the intermediate-frequency amplifiers, the listening device, and the correction elements for checking and correcting the amplifiers. The direction finder further incorporates different interchangeable frequency boxes containing the special circuit elements for the single frequency ranges. By means of an additional interchangeable box for remote control, the interchanging of the boxes for changing the frequency range can be avoided.
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