Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1953-05

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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   - d p -   L A B O R A T O R I E S
                                                                                                                                                           VOL. 4 No. 9-10



JLISHED BY THE HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA MAY-JUNE, 1953




                                           The -hp- TV Monitor

      MANY television engineers who have                                              Three panel meters on the equipment
              been associated with f-m broadcast                                   monitor the frequencies of the visual and
      stations have worked with the -hp- Model                                     aural carriers, and the percent modulation
      335B f-m frequency monitor and modulation                                    on the aural carrier with 100% modulation
      meter.1 That the 335B was a successful de                                    equal to 25 kc deviation. All indications are
      sign is indicated by the fact that it was used                               presented simultaneously. The monitor can
      in more f-m stations than all other monitors                                 be used with any one of the TV channels in
      combined. Among station personnel the                                        either the VHP or UHF bands. The circuit
      monitor has been popular because it oper                                     arrangement also accommodates stations
      ated accurately for extended periods with                                    that may have offset carriers. Full provision
      out adjustment.                                                              is made for the use of a remote over-modu
         The same design approach used in the                                      lation lamp as well as remote indicating
      335B has been used in the new -bp- Model                                     meters. All operating adjustments can be
      335E aural and visual monitor for television                                 made on the front panel of the monitor.
      stations. The 335E uses the pulse-counter                                       Although the 335E is primarily intended
      type frequency meter that proved popular                                     to indicate the percentage modulation of the
      in the 335B because of its simplicity and sta                                aural carrier and to monitor the frequencies
      bility. Like the f-m monitor, the TV monitor                                 of both carriers, it is also valuable as an aid
      is small in size, being only 12

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