. The Bell System technical journal . Fig. 22—Western Electric 1B29 spark gap tube. 1B31 The 1B31 fixed gap was also an aluminum cathode gap, with a gap spacingof 300 mils and 24 inches of 75% hydrogen and 25% argon. An exteriorand a cross-sectional view are shown in Figure 23. This gap was developedfor an airborne radar. This modulator was required to furnish a peak powerof 230 kilowatts to a 2J53 magnetron. The modulator was also toI)rovide a range of pulse durations and repetition rates extending from at 1600 pulses per second to microseconds at 200 pulsesper
. The Bell System technical journal . Fig. 22—Western Electric 1B29 spark gap tube. 1B31 The 1B31 fixed gap was also an aluminum cathode gap, with a gap spacingof 300 mils and 24 inches of 75% hydrogen and 25% argon. An exteriorand a cross-sectional view are shown in Figure 23. This gap was developedfor an airborne radar. This modulator was required to furnish a peak powerof 230 kilowatts to a 2J53 magnetron. The modulator was also toI)rovide a range of pulse durations and repetition rates extending from at 1600 pulses per second to microseconds at 200 pulsesper second. In order to meet these requirements, two 1B31 tubes were used with apeak switch voltage of 8 kilovolts and a peak current of 75 amperes. Byusing a 300 mil spacing, a life greater than 500 hours was obtained at 200pulses per second, 5 microseconds and 75 amperes. The other operatingconditions were less severe from the life standpoint. The wide spacing used meant a considerable increase in the size of the cath- 598 BELL SYSTE
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