Title :
Spectral analysis and performance of a 20 kW CW uplink transmitter
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
Abstract :
In the 1994 Power Modulator Symposium, a treatment was given on the power supply performance of a 20 KW CW uplink transmitter for NASA´s Deep Space Network (DSN). This paper examines and reports on the phase noise and other spectral characteristics of the high-power RF uplink signal. Allan variance performance figures are presented and discussed and overall RF performance is examined against the existing requirements in terms of phase noise, Allan variance and stability. Also noted are the effects of AC versus DC filament modulation of the high power uplink Klystron amplifier. Tests have shown that DC cathode filament heating can eliminate the dominant 60 Hertz spurs that are evident in almost all phase noise tests. Practical implementations of phase noise tests are provided to document and facilitate future analysis
Keywords :
phase noise; pulse generators; pulsed power technology; radio transmitters; space communication links; spectral analysis; telecommunication power supplies; 20 kW; 60 Hz; Allan variance; CW uplink transmitter; DC cathode filament heating; Deep Space Network; Klystron amplifier; NASA; high-power RF uplink signal; performance; phase noise; pulsed power supplies; spectral analysis; spectral characteristics; High power amplifiers; Klystrons; Phase noise; Power supplies; RF signals; Radio frequency; Spectral analysis; Stability; Testing; Transmitters;
Conference_Titel :
Power Modulator Symposium, 1996., Twenty-Second International
Conference_Location :
Boca Raton, FL
Print_ISBN :
0-7803-3076-5
DOI :
10.1109/MODSYM.1996.564462
