. The Bell System technical journal . the gapbetween magnetron and load coaxials by folded low impedance coaxialsections incorporated into the bodies of the conductors. In the outer con-ductor a half wavelength section folded once is employed. In the sectionshown at (a), the joint is made at the current node in the choke section bythe outer of two cylinders which project from the load end of the coupler 278 SYSTEM TECHNICAL JOURNAL into the magnetron lead. In the partial section shown at (b), this outercylinder is not used and the joint occurs at the end of the section where thereis a cu
. The Bell System technical journal . the gapbetween magnetron and load coaxials by folded low impedance coaxialsections incorporated into the bodies of the conductors. In the outer con-ductor a half wavelength section folded once is employed. In the sectionshown at (a), the joint is made at the current node in the choke section bythe outer of two cylinders which project from the load end of the coupler 278 SYSTEM TECHNICAL JOURNAL into the magnetron lead. In the partial section shown at (b), this outercylinder is not used and the joint occurs at the end of the section where thereis a current antinode. In this method there exists the greater possibilityof sparking should the coupling not be clamped tightly. A folded quarterwavelength section is built into the inner conductor. If the wavelength isshort enough, as in the 5J26 and the 720A-E (see Figs. 58 and 63), thissection need not be folded, the inner post on the magnetron center conductorcan be eliminated and replaced by a solid center conductor on the load Fig. 47—A schematic diagram of the type of coaxial output circuit used in a number ofmagnetrons of wavelength 10 cm. or greater. Of particular interest are the means of con-tact-free or choke coupling employed in the inner and outer conductors, consisting of afolded concentric line section which presents zero impedance at the gap in the conductor,(a) and (b) represent two variationsof the choke in the outer conductor as explained inthe text. The more recent designs of magnetrons for wavelengths greater than 10 some form of this coupling. The impedance required at the output coupling to load the 728A-J mag-netrons for sufficient power output necessitated a rather high standing wavein the output line. This standing wave was provided by a transformer builtinto the radar system to which the magnetron was attached. This causedno trouble since the output power was below the point where RF voltagebreakdown in air in the line or coupling would oc
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