Braille recorder 46

Hell printer St. aps. 31 a; manufactured by Siemens & Halske, Berlin.

The experience with the „Hell“ operation mode was sobering, especially with the G1.5K shortwave station of the early series with the the Lorenz receiver; the use of the E41 single conversion superhet receiver improved the situation but also was a great challenge for station personnel.

At the decision of Maj Métraux, the army's singal chief, from February 1946 on, the use of Hell transmissions over shortwaves was abandoned and only hand-keyed telegraphy was used; the Hell equipment was withdrawn from the corps material.

However, the Hellschreiber proved itself useful on long-wave connections and especially in the wired network, so that a number of sets of the latest generation were procured again in 1946 to be used in the wired network of the Air Force and Anti-aircraft troops.

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

Operation

The components of the Hell teleprinter 46 with the combined transmitter and recorder St. abs. 31a are all housed in a wooden crate.

In this variant of the Hell printer system, the punched tape reader and tape printer are combined in one set.\

Lid removed, over the years the zinc plague has attacked the set.

In a wooden power distribution box, there is the main switch of the system, various sockets can be used to supply the various components.\

The tube buzzer St. sum. 1a produces an audio-frequency alternating current of 900 Hz, to which the Hell signal is superimposed and fed to the transmitter. The keying of the transmitter is done at the grid of the keying tube.\

The signal is converted into an audible signal in the receiver by means of a BFO, this audio signal is amplified in the Hell amplifier and fed to the 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 good synchronisation.