. The Bell System technical journal . the Bell Telephone Laboratories. channel which by itself would provide insufficient motion. The crossmember welded to the center of the bow and the vertical struts transmit themotion of the bow to the diaphragm which supports one of the cavity action is illustrated in Fig. 78 which shows a series of X-ray views of anoperating tube. Thus, the first view shows the conditions for no powerapplied to the tube, the second, for the tube operating but with the tunergrid biased to cut-ofT. The following views show the behavior with progres-sive increases
. The Bell System technical journal . the Bell Telephone Laboratories. channel which by itself would provide insufficient motion. The crossmember welded to the center of the bow and the vertical struts transmit themotion of the bow to the diaphragm which supports one of the cavity action is illustrated in Fig. 78 which shows a series of X-ray views of anoperating tube. Thus, the first view shows the conditions for no powerapplied to the tube, the second, for the tube operating but with the tunergrid biased to cut-ofT. The following views show the behavior with progres-sive increases in the power into the tuner channel. The ramifications in the design of a thermal tuner are many and the possi-ble configurations of the mechanism will depend greatly on the individualrequirements of the application. It is possible, however, to lay down somebasic principles. These are concerned with positiveness of action and speedof tuning. With regard to the first, it may seem anomalous to speak of 580 BELL SYSTEM TECHNICAL JOURNAL. TUNER YOKECONNECTOR WIRE FOCUSING WIRESTUNER GRIDTUNER CATHODE CAVITY GRIDSCOUPLING LOOP CATHODE HEATER ■COAXIAL OUTPUTLEAD Fig. 76.—Internal features of the 2K45: section through the output lead andnormal to the tuner cathode and strut. REFLEX OSCILLATORS 581 TUNER BOWTUNER CHANNEL- REPELLERDIAPHRAGM CONNECTOR FLEXIBLE DIAPHRAGM RESONATOR HEAT BLEEDER- FOCUSING ANODE BEAM -FORMINGELECTRODE
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
