Hem SAQ Forum SAQ Technical Discussions Wiring diagram of the “synchronous detector” at the receiving station for SAQ?

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  • #9228 Reply
    Juergen Urbig
    Participant

    Hallo everybody,
    In “The Book of Radio”, Charles William Taussig, 1922, pages 312-327
    I found the following technical description of the receiving equipment for SAQ used in Riverhead, Long Island:

    “The incoming oscillations are received in circuits corresponding to their respective wave lengths and then, by a complex system of “traps,” are purified of all unwanted signals, including most of the static disturbances. They are then passed through three stages of radio-frequency amplification, then rectified by means of a special two-element vacuum tube which is part of what is called a “synchronous detector”, and finally through two stages of audio-frequency amplification”

    Now my question:
    Does anybody know the wiring diagram of the “synchronous detector”? You can send either a file or a link to ma my email address
    dl4jwu@darc.de.

    Many thanks in advance
    Juergen (DL4JWU)

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    • #12434 Reply
      Jens Romeikat
      Guest

      Hello,
      Another source of this highly interesting publication can be found here,
      the text is machine-readable and can thus be translated into the respective language.
      https://archive.org/details/tekniska-meddelanden-fran-kungliga-telegrafstyrelsen-vol-4/page/16/mode/2up?view=theater

      by Jens

    • #12392 Reply
      Karl-Arne Markström
      Guest

      The schematic diagram of the whole VLF receiver was published in “Tekniska Meddelanden från Kungl.Telegrafstyrelsen” (“Engineering Bulletin of the Royal Board of Telecommunications”) in 1924, and is reproduced here:

      https://ham.se/threads/dags-att-koppla-upp-laaangvagsgrejerna.28342/page-2#post-133651

    • #9659 Reply
      Jens Romeikat
      Guest

      Hello,
      It’s a bit of speculation, but since it’s built as an RCA system, it should be essentially the same as
      the Riverhead receiving system.
      At this Forum I have put together what I found.
      https://www.wumpus-gollum-forum.de/forum/thread.php?board=29&thread=245&page=1

      The most important original sources so far are:
      h t t p s://www.crosscountrywireless.net/The%20Wave%20Antenna.pdf
      “The Wave Antenna A New Type of Highly Directive Antenna”
      (Diagrams of “wave-antenna” / principle circuit of HF-Stages)
      h t t p s://ur.booksc.me/book/32038623/02831e
      “The Electrical Plant of Transocean Radio Telegraphy”
      BY E. F. W. ALEXANDERSON, A. E. REOCH and C. H. TAYLOR

      Even more speculation is the detector, 2 interesting patents from Dr. Alexanderson
      (just “in time”):
      US1535082A ELECTRON DISCHARGE DEVICE
      CA208846A SIGNALLING SYSTEM
      (“Espacenet-Patent-search”)
      In this case a kind of “electronic tone wheel” would have been developed for the receiver.
      In any case, one suspects a kind of heterodyne or non-synchronous detector, since a superimposed tone must be generated
      that is audible in the headphone.

      Jens

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