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

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  • #9228 Svara
    Juergen Urbig
    Deltagare

    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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    • #9659 Svara
      Jens Romeikat
      Gäst

      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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