Accession Number : AD0467179


Title :   NEGATIVE-GRID TUBES FOR PHASED ARRAYS.


Descriptive Note : Quarterly progress rept. no. 7, 1 Jan-31 Mar 65,


Corporate Author : GENERAL ELECTRIC CO SCHENECTADY NY


Personal Author(s) : Beggs, J E ; Lavoo, N T


Report Date : 31 Mar 1965


Pagination or Media Count : 30


Abstract : Efforts were continued on a program to produce a triode or tetrode capable of providing a cw output of 1000 watts at 50 per cent efficiency at 1300 Mcs. Sixteen L-64 triodes were built, fourteen of which were available for emission studies and measurement of r-f performance. The transconductance values ranged from a minimum of 0.22 mho to 0.7 mho at a plate current of 2 amperes. Fifteen L-65D diodes were made for emission studies and life testing. Up to two hours of stable operation was obtained at a cathode current density of 10 A/cm squared, and up to 1000 hours duration at 1.5 A/cm squared. A gain of 14 db has been obtained from an L-64 triode operating grid pulsed at a power output of 5.7 KW in a 10% bandwidth circuit at 1.3 Gc. The pulse width was 500 micro seconds, the duty cycle was .07, and the plate efficiency was 33.7%. At small-signal levels a number of L-64's have given a gain-bandwidth product in excess of 15 Gc under long pulse conditions. One tube has been operated at 16 db gain with 20% bandwidth. Wider bandwidths appear feasible. (Author)


Descriptors :   *TRIODES , *TETRODES , RADIOFREQUENCY POWER , GAIN , RADIOFREQUENCY PULSES , BANDWIDTH , MOLYBDENUM , HAFNIUM , CAVITY RESONATORS


Distribution Statement : APPROVED FOR PUBLIC RELEASE