A Versatile Linear Gridded-Tube Cavity UHF Power Amplifier
Abstract
A linear UHF broad-band power amplifier, using a type X2135J focused- beam power triode with a double-tubed anode resonator, was designed, built and tested. The X2135J development model was similar to the type 8938 triode but was modified for higher thermal and electrical conductivity. The tube-cavity combination gave 1200 watts of CW output over a minimum instantaneous bandwidth of 11.17 MHz, with 11 to 12 db of gain. The plate efficiency was 54 percent; the amplifier was mechanically tuneable over a 225 to 400 MHz band. Pulse tests were made with more than 12.5 KW output, with 10 percent duty and 10 millisecond pulse width. Pulse power gain was 11.2 to 12.3 db at the 11.2 MHz bandwidth. Linearity (intermodulation distortion) measured by the two-tone method were degraded 10 db at 400 MHz compared to low frequency (2 MHz) results; further effort would be required to assign a cause and improve linearity at UHF frequencies.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1974
- Accession Number
- ADA004655
Entities
People
- R. F. Rinaudo
- R. I. Sutherland
- W. H. Sain