RESEARCH AND DEVELOPMENT ON L-BAND CROSSED-FIELD AMPLIFIER CHAIN
Quarterly progress rept. no. 8, 1 Sep-31 Dec 1964
S F D LABS UNION NJ
Pagination or Media Count:
Life tests were continued on the Group C, SFD-209 Tubes. Tubes L48E and D37F have operated for 4932 hours and 2368 hours respectively. The life test program has now accumulated a total of 11,881 life test hours. Construction and RF testing of the group D design tubes was completed. Tube F63F was tested to 1500 watts average power with a 200 microsecond pulse. The performance of tubes F63F and G35F proved that the dependence of performance characteristics on anode-cathode spacing can be predicted. The operating efficiency of tube L7F indicates that, by increasing end hat diameter, the efficiency is raised above 50 at all frequencies in the operating band. Tube J4F indicated that matrix impregnated cathodes, processed in accordance with standard techniques, do not necessarily develop a high secondary emission ratio. The variations in impedance match from tube to tube can be traced to the design of the susceptive matching tabs and the output and input line assembly technique.
- Electrical and Electronic Equipment