. The Bell System technical journal . Fig. 43—Four tunable magnetron oscillators. They are: (1) the 4J42 magnetron (40kw., 660 to 730 mc/s); (2) the 4J51 magnetron (275 kvv., 900 to 970 mc/s); (3) the 5J26magnetron (600 kw., 1220 to 1350 mc/s); and the 2J51 magnetron (5^ kw., 8^00 to 9600mc/s). in which work has been done. It illustrates both the coaxial and wave-guide types of output circuits, the use or not of attached magnets, and thetwo types of input leads and cathode supports. In Fig. 43 is shown thegroup of tunable magnetrons developed as replacements for fre-quency models with w
. The Bell System technical journal . Fig. 43—Four tunable magnetron oscillators. They are: (1) the 4J42 magnetron (40kw., 660 to 730 mc/s); (2) the 4J51 magnetron (275 kvv., 900 to 970 mc/s); (3) the 5J26magnetron (600 kw., 1220 to 1350 mc/s); and the 2J51 magnetron (5^ kw., 8^00 to 9600mc/s). in which work has been done. It illustrates both the coaxial and wave-guide types of output circuits, the use or not of attached magnets, and thetwo types of input leads and cathode supports. In Fig. 43 is shown thegroup of tunable magnetrons developed as replacements for fre-quency models with which they are electrically and mechanically inter- 268 BELL SYSTEM TECHNICAL JOURNAL. a -C i MAGNETRON AS GENERATOR OF CENTIMETER WAVES 269 changeable. Finally, in Fig. 44 are shown two magnetron oscillators, the720A and 725A, mounted in their magnets. By comparison with Fig. 42,the space and weight saved by packaging may be seen. A fair comparisonis that between the 725A and magnet of Fig. 44 and the 4J52, number 2in Fig. 42. Both are cm. models, the latter, moreover, being capableof generating higher power. The designer of a magnetron oscillator is faced with a variety of the magnetron is to be used in a specific application he has at his disposaldata concerning the amount of power available to drive the magnetron,the nature of the pulsing if such is to be used, the frequency of operation,mechanical features having to do with form and weight, and an idea of whatthe user hopes or expects to obtain in the way of output power, frequencystabiUty, and operating efficiency. It is the problem of magnetron designto arrange the resonator system, output circuit, c
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