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====== Hellschreiber 36 ======
**Hellschreiber 36** with the printer **T. empf. 12**; manufactured by [[Siemens|Siemens & Halske, Berlin]].

The [[Hellschreiber]] or the teleprinting method according to R. Hell was developed by Rudolf Hell in 1929, and the Hell-Schreiber systems sold by [[Siemens]] found great interest in the public, especially in press and commercial radio users.

The text messages in the form of a punched tape are converted by the Hell transmitter into a grid of 7 x 7 pixels and this signal is fed to the transmitter as a pulse sequence. In the receiver, the received pulses are amplified and fed to the printer, which uses a writing spindle to print the message on paper tape.

{{:images:endgeraete-siemens-hell-schreiber-36-41.jpg?direct&600|Siemens Hellschreiber 36 / 41}}
===== Technical data =====
  * [[Principle]]: Teleprinter
  * [[Operation modes]]: [[Hell]] (quasi-facsimile system according to Dr Rudolf Hell)

==== Power supply ====
  * [[Mains operation]]: 220 V AC mains 

==== Dimensions ====

==== Accessories ====

===== System material =====
A complete Hell teleprinting system consists of a "hand punch", with which the punched paper tapes containing the message are created.\\ 
{{:images:endgeraete-siemens-hell-handlocher-bw.jpg?direct&400|Siemens Hell: Handlocher}}

The tape reader reads the punched tape and generates the Hell signal.

{{:images:endgeraete-siemens-hell-geber-bw.jpg?direct&400|Siemens Hell generator}}

To the signal is an audio-frequency of 900 Hz from the tube buzzer **T. Sum. 3a** (AF generator) superimposed, the Hell signal is fed to the transmitter; the transmitter is keyed at the grid of the keying valve. 

{{:images:endgeraete-siemens-hell-rohrsummer-t-sum-3a.jpg?direct&400|Siemens Hell: Tube buzzer T. Sum. 3a}}


**On the receiver side**, the audio frequency signal must be amplified  (in the AF amplifier **T. Verst. 16a**) and is fed to the Hell printer.\\ 
{{:images:endgeraete-siemens-hell-verstaerker-t-verst-16a.jpg?direct&400|Siemens Hell: Amplifier T. Verst. 16a}}

In the Hell printer **T. Empf. 12**, a double writing screw is pulled by electromagnets to print the characters on the slowly moving paper tape.\\ 
{{:images:endgeraete-siemens-hell-schreiber-t-empf-12.jpg?direct&400|Siemens Hell Printer}}

If the speed is poorly synchronised, the two printouts of the message run at an angle, but the message itself remains legible. The synchronisation can be adjusted with the speed control until the two print strips run exactly parallel indicating optimum synchronisation.\\ 
{{:images:endgeraete-siemens-hell-streifen.jpg?direct&400|Siemens Hell: Streifen}}

===== Technical principle =====
Character transmission in a quasi-facsimile using a 7 x 7 pixel matrix.

==== Tube layout ====
  * in the **tube buzzer T. Sum. 3a**: one [[RGN1064]] or [[RGN1054]], one [[RE134]], one fuse 500 mA
  * in the **amplifier T. Verst. 16a**: one [[RGN1064]] or [[RGN1054]], one [[RE604]], one RE904 (resp. in amplifier 16d with current control RE924, one fuse 500 mA

==== Development ====
The sets developed by engineer Rudolph Hell were manufactured by [[Siemens|Siemens & Halske, Berlin]] and distributed for the civilian market.

==== Use ====
In the high power wireless station [[SE-302|G1.5K]], the stations with serial numbers 1 - 14 were equipped with the **Hell printer 36**, 12 of which were procured. The system came in two crates and an additional crate for the tape punch.

{{gallery>:images?endgeraete-siemens-hell-schreiber-t-empf-12*.jpg&0&80x80&lightbox&showtitle&titlesort}}
===== Technical documentation =====
  * [[https://hamfu.ch/_upload/Siemens-Siemens-Hell-Schreiber_Tempf14-1946-web.pdf|Siemens Hell Schreiber T.empf.14, Siemens & Halske]]
==== Further information ====
  * [[http://armyradio.ch/radio-d/siemens-hell-schreiber.htm|Siemens Hell Schreiber 36 / 41 at www.armyradio.ch]]
  * [[https://www.hamfu.ch/de/geraete/geraet.php?id=128|Siemens Hell Schreiber on the Hamfu website]]
  * [[https://www.nonstopsystems.com/radio/hellschreiber-presse-hell.htm|Siemens Hell Schreiber T.12b and T14]] on the website of Frank Dörenberg