Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1955-02

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                                                   HEWLETT-PACKARD


                                         JOURNAL
                                         TECHNICAL INFORMATION FROM THE -hp- LABORATORIES                                                        Vol. 6 No. 6

ISHED BY THE HEWLETT-PACKARD COMPANY, 275 PAGE MILL ROAD, PALO ALTO, CALIFORNIA                                                           FEBRUARY, 1955




                                        A New 10 MC to 12 KMC
                                       Coaxial Crystal Detector Mount
   ANEW general-purpose coaxial crystal de                               from the mount is provided at a negative polarity.
          tector mount has been developed to operate                        Either of the physically- identical 1N26A or
   over the entire range from 10 megacycles to 12.5                      1N76 silicon crystals can be used in the mount,
   kilomegacycles. Since this range is essentially                      but it is supplied with a type 1N76 and this type
                          the complete range practical                  is available for replacement purposes. To assist
     SEE ALSO:            for coaxial systems, this one                 in obtaining the wide frequency range that the
     "New Decade
      Counters," p. 2     mount can be used for all or                  mount has, the crystals are modified by removing
    "New Matching
      Transformers," p. 4 dinary coaxial-system detec                   part of the outer shell. Crystals on which this
                          tor applications. A feature of                modification has been made are available for
   the mount is that it has been designed to have                       replacement purposes, although the modifica
   reduced sensitivity to variations in crystal char                    tion can also be made by the user.
   acteristics.                                                            Crystal detector mounts of this type are gen
       The new mount has a rated sensitivity of ap                      erally used in one of two applications: as de
   proximately 0.1 volt per milliwatt and a maxi                        modulators for pulse-modulated power where
   mum input power rating of 1 milliwatt. Its                           it is desired to view the pulse shape on an oscil
   frequency characteristic is such that its output is                  loscope, or as simple detectors of r-f power. In
   constant within approximately 4 db over the                          simple detector applications, the power can be
   rated frequency range for a constant applied                         either modulated or c-w. With modulated power
   power. Its VSWR does not exceed 3:1. Output                          the mount can be combined with a suitable a-c
                                                                        indicator such as a standing-wave indicator or
                                                                        high-gain voltmeter. With c-w power the mount
                                                                        can be used with a d-c microammeter.
                                                                           As is customary with detector mounts, no
                                                                        video load resistor is included in the mount,
                                                                        since the value of the load resistance usually
                                                                        must be chosen to suit the application. When
                                                                        using detector mounts for viewing pulses on an
                                                                        oscilloscope, the load resistance should be se
                                                                        lected commensurate with the required pulse
                                                                        rise time and oscilloscope sensitivity. The mount
                                                                        has an output capacity of approximately 30 mi-
                                                                        cromicrofarads. Typically, therefore, rise times
                                                                        in the order of 0.1 microsecond can be obtained
                                                                        with load resistances of a few hundred ohms in
   Fig. 1. New -hp- Model 420 A Crystal Detector Mount operates
                    orer 10 me to 12 kmc range.                         the usual set-up. If the applied r-f level is ap-

   P R I N T E D   I N   U . S . A .                                                          C O P Y R I G H T   1 9 5 5   H E W L E T T - P A C K A R D   C O .



                                                  

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