NDLI: Very low-noise traveling-wave tube

Content Provider	IEEE Xplore Digital Library
Author	Kinaman, E.W. Magid, M.
Copyright Year	1956
Description	Author affiliation: Radio Corporation of America, Harrison, New Jersey (Kinaman, E.W.)
Abstract	This paper describes recent improvements in design and techniques which have lowered the noise figure of a developmental traveling-wave amplifier from 9 db to 6 db. Some selected tubes have had noise figures as low as 4.7 db. The improved tube is now commercially available as the RCA-6861 low-noise traveling wave tube. A general explanation of beam noise is presented and the presently employed noise-reducing schemes and theories are discussed in relation to the 6861. The specific factors contributing to the very low noise figures are evaluated, including low helix loss, low QC with high circuit impedance, maximum beam diameter with minimum intercepted current, a flexible low-noise gun, and, most important, a smooth and highly emissive dense oxide cathode operating at about 600°C. Application considerations are also discussed, including phase sensitivity, life, saturation effects (modulation and harmonic generation), allowable voltage variations, and typical noise figure, gain, and match over the 2700-to-3500 Mc frequency range of the tube.
Starting Page	19
Ending Page	19
File Size	64594
Page Count	1
File Format	PDF
DOI	10.1109/IEDM.1956.186982
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1956-10-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Noise figure Circuit noise Pulse amplifiers Low-noise amplifiers Flexible printed circuits Impedance Cathodes Phase modulation Frequency conversion Voltage
Content Type	Text
Resource Type	Article

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