Title :
A highly temperature stabilized K-band (18-26.5 GHz) Gunn VCO for high capacity digital radio systems
Author :
Ondria, John ; Singleton, John
Author_Institution :
Marconi Electronic Devices Ltd., Lincoln, UK
Abstract :
Gunn oscillators have been designed for use in a quaternary phase shift key (QPSK) high capacity digital data link radio system, operating over the 17.7 to 19.7 GHz region, which exhibit a high degree of frequency stability with no detectable phase hit characteristics over a wide temperature range (-20°C to +70°C). The basic design incorporates a single Gunn diode, an electronic tuning varactor used with AFC to control the frequency and a second frequency modulation varactor. This latter varactor provides a service band facility and engineers order wire (EOW) information which is frequency modulated with low frequency signals on the transmit oscillators. A continuous mechanical tuning capability required for channel selection over a nominal 770 MHz bandwidth, is also included in this design
Keywords :
Gunn diodes; Gunn oscillators; data communication systems; digital communication systems; frequency stability; microwave links; phase shift keying; variable-frequency oscillators; -20 to 70 degC; 17.7 to 26.5 GHz; 770 MHz; AFC; Gunn diode; Gunn oscillators; K-band; QPSK; channel selection; continuous mechanical tuning; digital data link; electronic tuning varactor; engineers order wire information; frequency modulated; frequency modulation varactor; frequency stability; high capacity digital radio systems; low frequency signals; microwave links; quaternary phase shift key; service band; temperature stabilised; transmit oscillators;
Conference_Titel :
Microwave Components in Telecommunications, IEE Colloquium on
Conference_Location :
London
