Test Oscillator TS-47/APR - FCI - U.S.A. -  1945. - VHF and UHF oscillator used for receivers and radar sets calibration. Frequency from 40 to 500 MHz in two ranges: 40/115 MHz and 115/500 MHz. Connector output N type, which central contact can be extended and operate like rod antenna. RF output 3 mW in band 40 to 400 MHz and 1 mW from 400 to 500 MHz. Output pure or modulated with 1000 Hz 50% or with pulses 70 ms  of duration, with a repetition of 500 impulses by second. Power supply: battery 6,3 V-550 mA and  220 V-20 mA, or AC net: 20 to 115.230 V - 50 to 2600 Hz. Use 3 tubes: (2) 9002, (1) 6X5.