en:etk
Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
— | en:etk [2019/11/27 16:10] (aktuell) – angelegt - Externe Bearbeitung 127.0.0.1 | ||
---|---|---|---|
Zeile 1: | Zeile 1: | ||
+ | ====== ETK ====== | ||
+ | **Single tone combination teleprinter** (" | ||
+ | After World War II, Dr. E. Gretener developed the paper tape teleprinter " | ||
+ | |||
+ | The ETK was initially used on wired teletype connections, | ||
+ | |||
+ | The communications system was enhanced with the [[Telekrypto 53]] cipher machine for real-time encryption. | ||
+ | It turned out, that quite often, due to propagation disturbance or interference on the radio transmission frequency, reception was interrupted and even one single bit or character caused the ciphering machines at the transmitter and receiver site went out of synchronisation - the rest of the radio message could not be decoded correctly and the teleprinter printed messages in " | ||
+ | |||
+ | It was only the successor, the [[KFF58]] (" | ||
+ | |||
+ | {{: | ||
+ | ===== Specifications ===== | ||
+ | * [[Principle]]: | ||
+ | * [[Modes]]: 14 element code | ||
+ | |||
+ | ==== Power Supply ==== | ||
+ | * [[Mains]]: 110; 125; 145; 220; 250 V AC mains | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | * 440 x 420 x 325 mm, 27.5 kg | ||
+ | |||
+ | ==== Accessories ==== | ||
+ | * The multipole connector cable and power cord are stored in the cover. | ||
+ | |||
+ | ===== Stations Material ===== | ||
+ | In research of a replacement for the mechanically complex teletypewriter " | ||
+ | |||
+ | Unlike the [[Schreibtelegraph 34|Teletypewriter]], | ||
+ | |||
+ | In the **Single tone combination teleprinter ETK**, the electronics with the line amplifier are housed in the transport case, the actual teleprinter with the keyboard and the paper tape printing mechanism is pulled out of the case for operation. | ||
+ | |||
+ | For each character, a sequency consisting of a start pulse (20 msec.), fourteen pulses (0 or 1, i.e. active current or no current) and a stop pulse (30 msec.), is transmitted each time a character key is pressed on the keyboard. For each character, the control shaft does a 360° turn. The " | ||
+ | |||
+ | {{: | ||
+ | The collector distributor, | ||
+ | |||
+ | In **transmit mode**, the start pulse is triggered by pressing any key, the start magnet is de-energized, | ||
+ | {{: | ||
+ | |||
+ | In **receive mode**, the incoming start pulse triggers the turning of the control shaft. In the following phase of the fourteen segment steps, the type revolver is rotated around it's axis and the characters are printed.\\ | ||
+ | {{: | ||
+ | |||
+ | In the presence of signal current, the printing of the corresponding segment is suppressed; during the de-energized state during the period of the corresponding character step, the segment is printed on the paper tape by the printing unit, i.e. the printing elements during the current gaps of an impulse program are printed. The paper feed is done during the start-stop step.\\ | ||
+ | {{: | ||
+ | |||
+ | To **operate the teleprinter**, | ||
+ | |||
+ | Inside the teleprinter, | ||
+ | {{: | ||
+ | |||
+ | To feed the paper, the lid must be opened and the paper tape inserted according to the instructions. It is important that the felt roll in the printing unit is soaked with the recommended amount of ink. | ||
+ | {{: | ||
+ | |||
+ | On wired lines, the ETK teleprinter runs in **single tone mode**, i.e. during one impulse program, the " | ||
+ | After experiments with wireless operation with the ETK 47/50 it turned that, especially during the " | ||
+ | |||
+ | So for wireless operation, dual-tone mode has been implemented in the [[ETK-R]], in this set " | ||
+ | So continuously a sound frequency is transmitted, | ||
+ | |||
+ | As a speciality of the set, in the [[ETK-R]], the first harmonics (2400 Hz ± 110 Hz instead of 1200 Hz ± 55 Hz) are filtered, which improves decoding during fading ("Funk Fading" | ||
+ | |||
+ | The [[ETK-R]] teleprinter can also be set from dual-tone to the more troublesome single-tone mode operating on 1500 Hz, if the set is communicating with an ETK-47/50 (for example in wired operation). | ||
+ | |||
+ | To generate the punched paper type, the teletypewriter [[stg-68|Siemens T. typ. 68]] can be used, so that at the same time, the text can also be printed in plain text. | ||
+ | |||
+ | ===== Technical Principle ===== | ||
+ | |||
+ | ==== Component Layout ==== | ||
+ | |||
+ | ==== Development ==== | ||
+ | To replace the [[Schreibtelegraph 34]], the olt teletypwriter came in a total of eight crates in addition to a petro generator, during the the last years of World War, Dr. Ing. E. Gretener developed the " | ||
+ | |||
+ | Unlike standard teletypewriters, | ||
+ | |||
+ | A first badge of 50 single-tone combination teleprinters **ETK Model 47** for wired use was delivered in 1947, after improvements to the keyboard, the more reliable model 50 was created. | ||
+ | |||
+ | Since the lack of synchronisation caused problems, when wireless operation was used, an improved variant of the ETK was ordered by the "War Department" | ||
+ | |||
+ | ==== Mission ==== | ||
+ | |||
+ | {{gallery>: | ||
+ | |||
+ | ===== Technical Documents ===== | ||
+ | * {{ : | ||
+ | * {{ : | ||
+ | * {{ : | ||
+ | |||
+ | ==== Additional Information ==== | ||
+ | * Das Fernmeldematerial der Schweizerischen Armee, Band 14, Die Endgeräte vom Morseschreiber bis zum Laptop, Merker Verlag, Luzern | ||
+ | * [[http:// | ||
+ | * [[https:// | ||
+ | * [[https:// |
en/etk.txt · Zuletzt geändert: 2019/11/27 16:10 von 127.0.0.1