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SIG CATEGORY INDEX For synopsis see page No. Radio Transmission Security TF 11-1976 (28 min—1955) 341 Defense Against Radio Jamming TF 11-1995 (24 min—1956) 341 The Effects of the Ionosphere on Radio Wave Propagation TF 11-1632 (30 min—1950—Film Reference) 337 Tuned Circuits TF 11-1831 (28 min—1954) 340 Radio Technician Training Series—Capacitance MF 11-1087 (31 min—1944—Film Reference—From Navy Film 212 MN 1540-A). Radio Technician Training Series—Parts I and II: Induc- tance MF 11-1088 (34 min—1944—Film Reference—From Navy Film 212 MN1540-B). Circuit Testing with Meters and Multimeters—Theory TF 11-1666 (35 min—1952—Film Reference) 338 Circuit Testing with Meters and Multimeters—Practical Application TF 11-1667 (33 min—1952—Film Reference) 338 Circuit Testing—Signal Generators TF 11-1668 (26 min—1952—Film Reference) 338 Basic Principles of Frequency Modulation TF 11-2069 (31 min—1944—Film Reference) 341 Microwave Oscillators TF 11-1567 (18 min—1949—Film Reference) 337 Radio Sets AN/GRC-3, -4, -5, -6, -7, and -8 TF 11-1793 (15 min—1952—Film Reference) 339 Calibration Procedure, Set NR-2, RT 70 TF 11-2298 (9 min—1956) 342 Tuning Transmitters—Part I: Setting Frequency TF 11-1342 (16 min—1944—Film Reference) 336 Tuning Transmitters—Part II: Amplifier and Antenna Tun- ing TF 11-2091 (20 min—1945—Film Reference) 342 Erection of the AS-19/TRC-1 Antenna System TF 11-1823 (14 min—1953—Film Reference) 339 Radio Sets AN/PRC-8, 9, and 10 TF 11-2180 (26 min—1955) 342 Calibrating and Tuning Radio Set AN/PRC-10 TF 11-2181 (9 min—1955) 342 Frequency Meter SCR-211 TF 11-1188 (18min—1943—Film Reference) 335 AN/TRC—The Radio Relay Systems of Communications TF 11-1779 (42 min—1952—Film Reference) 339 The Single Sideband Multichannel Radio System TF 11-1900 (39 min—1954—Film Reference) 341 Communications in the Infantry Regiment TF 11-1488 (26 min—1948—Film Reference) 337 Communications in the Infantry Division TF 11-1487 (39 min—1948—Film Reference) 337 23Q AGO 10118B t I