. The Bell System technical journal . -REPELLER GRIDS CATHODE SPIKE CATHODE _CATHODEi HEATER BEAM-FORMINGELECTRODE _ TUNERBACK STRUT Fig. 64.—Section view of the 2K29 reflex oscillator shows the electron opticalsystem used in eliminating hysteresis. (Fig. 65) This tube has an internal cavity and isdesigned for the frequency range from 3400 to 3960 mc/s. 565 566 nELL SYSTEM TECHNICAL JOURNAL the design was that the spread in the transit angle for zero signal should besmall. This requirement is not as stringent as might be expected. Thecontribution to the electronic conductance by a current
. The Bell System technical journal . -REPELLER GRIDS CATHODE SPIKE CATHODE _CATHODEi HEATER BEAM-FORMINGELECTRODE _ TUNERBACK STRUT Fig. 64.—Section view of the 2K29 reflex oscillator shows the electron opticalsystem used in eliminating hysteresis. (Fig. 65) This tube has an internal cavity and isdesigned for the frequency range from 3400 to 3960 mc/s. 565 566 nELL SYSTEM TECHNICAL JOURNAL the design was that the spread in the transit angle for zero signal should besmall. This requirement is not as stringent as might be expected. Thecontribution to the electronic conductance by a current element whose APPROXIMATE ZERO EQUIPOTENTIAL. Fig. 65.—Repeller design for eliminating hysteresis in a reflex oscillator. The electronsmake only two transits through the gap. The repeller does not return them to the cathoderegion hut to the edge sup])orting one of the grids of the gap. Equipotcntials determinedfrom an electrolytic trough investigation are shown and the electron trajectories com-puted from these equipotcntials. transit angle deviates from the optimum by a small angle Ad varies as cos A^,so that even for spreads in angle as great as ± 30° the effect is not design illustrated in Fig. 64 was strikingly effective in reducinghysteresis. Fig. 66 shows repeller characteristics for the original designwhich was extrapolated from the 723A/I5 and for the design of Fig. 64, REFLEX OSCILLATORS 567 In addition to improving the electronic tuning characteristics the designwas found to be more stable against variations in load, as would be ex-pected from the discussion of Section VIII. The arrangement adopted provi
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
