Agilent 1963-03 free download

File name 1963-03.pdf

HEWLETT-PACKARD JOURNAL T E C H N I C A L I N F O R M A T I O N F R O M T H E - h p - L A B O R A T O R I E S UBLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA MAR. -APR., 1963 A New Microwave Modulator ANEW modulator has been designed which since internally-generated noise is small. Mod substantially simplifies the task of ampli ulation can be obtained from internal or exter tude-modulating microwaves in the range nal pulses or square waves or from external from 800 to 2400 megacycles. Basically, the sine waves. The internal circuits include delay new modulator is an electrically-variable at and width circuits which are adjustable down tenuator whose attenuation can be changed to 0.1 microsecond and which are jitter- free. The new modulator operates by absorbing Sff ALSO: the microwave energy applied to it, as opposed S e n s i n g m a g n e t i c f i e l d s , p . 7 The Smith Chart with negative Z, p. S to other solid-state modulators which reflect N e w P r e f i x e s , p . 8 it. The instrument thus minimizes the difficul ties associated with reflection. Reflections can, very rapidly. Its properties include fast rise and for example, pull the frequency of tightly- decay times of less than 20 nanoseconds, an on- coupled microwave oscillators and therefore off ratio of 80 db, and the fact that it is solid- cause frequency modulation. Large reflections state. It will handle up to one watt of micro can also permanently damage some sources wave power and can also be used at low level, suc