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Hellschreiber 36

Hellschreiber 36 with the printer T. empf. 12; manufactured by 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.

Siemens Hellschreiber 36 / 41

Technical data

Power supply

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.
Siemens Hell: Handlocher

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

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.

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.
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.
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.
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 & Halske, Berlin and distributed for the civilian market.

Use

In the high power wireless station 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.

Technical documentation

Further information

en/hellschreiber_36.txt · Zuletzt geändert: 2024/01/14 19:27 von mb