. The Bell System technical journal . Fig. 89.—The 2K50—a reflex oscillatjr with thermal tuning and a wave guide outputor operation in the 1 centimeter range. GUN CATHODE ENLARGED DETAILS Fig. 90.—Internal features of the 2K50. REFLEX OSCILLATORS 599 than the guide. This is desirable in a radar receiver for circuit reasons,which require that the cathode of the oscillator be at ground potential. The iris size is a compromise chosen to provide sufficient sink marginthroughout the band. An iris coupling inherently varies with frequencyand provides a weaker coupling at lower frequencies. Hence, si
. The Bell System technical journal . Fig. 89.—The 2K50—a reflex oscillatjr with thermal tuning and a wave guide outputor operation in the 1 centimeter range. GUN CATHODE ENLARGED DETAILS Fig. 90.—Internal features of the 2K50. REFLEX OSCILLATORS 599 than the guide. This is desirable in a radar receiver for circuit reasons,which require that the cathode of the oscillator be at ground potential. The iris size is a compromise chosen to provide sufficient sink marginthroughout the band. An iris coupling inherently varies with frequencyand provides a weaker coupling at lower frequencies. Hence, since a suffi- \^ ^S)^ LO ^ lo .<?/ f= 24,464 MEGACYCLES PER SECOND Fig. 91.—A performance diagram for the 2K50 at the high frequency band limit. Thisdiagram shows loci of constant power as a function of the admittances presented at theplane of the tube window. Admittances are normalized in terms of the characteristicadmittance of the wave guide. cient sink margin must be provided at the wavelength where the couplingis a maximum, this means that an of sink margin exists at the lowfrequency end of the band. This is illustrated by the impeda
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
