Goniometer for checking radio direction finder - simulates north-south, east-west and auxiliary induced antenna voltages using phase-shifters and attenuators

摘要

The goniometer provides voltages simulating those normally induced in the antenna system of the direction finder by radiation received at a given angle. It has a variable frequency transmitter (2) coupled to a power distributor (4) with three outputs. Two of these are each coupled via a phase-shifter (5, 6) and a variable attenuation element (7, 8) to respective goniometer terminals (II, III). The remaining output is coupled to the first goniometer terminal (I) via a variable phase dependant element (9). Pref. the signal path to each goniometer terminal (I, II, III) also includes a fixed attenuation element (10, 11, 12) for impedance matching.