Wiring diagram of the “synchronous detector” at the receiving station for SAQ?

Detta ämne har 3 svar, 1 deltagare, och uppdaterades senast för 2 veckor, 4 dagar sedan av Jens Romeikat.

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25 oktober, 2021 kl. 16:25 #9228 Svara

Juergen Urbig
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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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- 5 december, 2024 kl. 00:36 #12434 Svara
  
  Jens Romeikat
  Gäst
  
  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
- 2 december, 2024 kl. 10:44 #12392 Svara
  
  Karl-Arne Markström
  Gäst
  
  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
- 21 september, 2022 kl. 16:34 #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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Wiring diagram of the “synchronous detector” at the receiving station for SAQ?

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