Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1963-03

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                                                            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,                                                    such as traveling-wave-tube amplifiers.




                  Fig. 1. New -hp- Model 8714A Modulator gives wide                                                    Fig. 2. Spectrogram taken of 2 usec RF
                  versatility in modulating waves in the 0.8

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