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A tribute to its inventor, Sven H. Dodington. |
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VINTAGE AVIONICS |
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The circuit around nearly every tube in the ARN-21 is covered by a patent. These patents give a good description of that part, and how the inventor intended its function. S.H.Dodington alone holds some 30 patents. You can see these patents on a patents server (use number search) |
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EARLY TACAN PATENTS |
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US2753507 Tuning motor control 1956 US2753525 3x 2C39A 1952 US2753553 Constant duty cycle 1956 US2781489 135Hz sample-hold 1955 US2790079 Multi channel xtal control 1956 US2791690 Ferris discriminator 1956 US2795775 Main ref detector 1955 US2798947 Level control LO 1954 US2810874 Servo (range & azimuth) 1955 US2815507 Distributed aux ref group 1955 US2833967 Relay control circuit 1955 US2877344 IF on 31.5 mc (not 63 !) 1955 US2890449 Tacan Basics 1953 US2906874 Triggered pulse generator 1956 US2912686 Range gate 1955 US2912688 Tacan test set 1957 US2912689 ID pulses 1350Hz 1957 US2916614 LO multipliers 1959 US2916737 Beacon ID 1350 Hz lock 1957 US2916738 15Hz and 135Hz circuits 1956 US2924821 Phase comparator 1955 US2924822 Azimuth receiver 1958 US2947987 Antenna decoupling 1955 US2981943 Range dependant Tx power 1953 US3051946 Faster Range search 1958 US3054103 Variable PRF (15/150Hz) 1957 US3076190 A/A addition to ARN21B 1960 US3098980 Klystron gauss modulator 1963 |