1390 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1956 



output jack. The unit may be clamped in position after matching adjust- 

 ments are made by tightening the knurled thumb screw which pushes a 

 cylindrical slug containing an adjustable piston against the wafer unit. 

 The piston is a short septum which slides in shallow grooves in the top 

 and bottom of the ya-inch high waveguide, thus dividing the waveguide 

 into two guides which are beyond cut-off. This septum is made of two 

 pieces of thin beryllium copper bowed in opposite directions so that good 

 contact is made to the sides of the grooves in the top and bottom of the 

 waveguide. Since the piston with its connecting rod is very light in weight 

 and is held firmly in place by the spring action of the bowed septum, no 

 additional locking mechanism need be provided. Since the rectifier is 

 essentially broadband by design, the adjustment of the piston is not 

 critical and is readily made by hand. The piston rod is protected by a 

 cap which is snapped in place over the thumb screw when all tuning 

 adjustments are completed. 



B 



n 



L, 



3 



"0 or 



J 



SECTION B-B 



SECTION A -A 



Fig. 6 — Assembly drawing of millimeter-wave converter. 



