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Elcro Family
The Elcro series of crypto equipment is now manufactured by a German company called SIT Gesellschaft für Systeme der Informationstechnik GmbH, a division of "Rhode & Schwarz SIT GmbH". One of their current products is the Elcrodat 6-2 encryption device together with a host of other security appliances.

Some product lines from the family are:

 

 

C. ELCROTEL

Elecrotel - Telegraphy encryption equipment for use on TTY circuits. Runs up to 1200 baud.

Both the Elcrotel 5 and Elcrovox 1-4D machines looked very similar Each device consists of two carrying cases, set on top of each other. The bottom one contains the power supply and interface unit while the top one has the cryptographic unit. These devices are keyed by turning the CH/KL (Chiffrieren/Klartext or Cipher/Clear) switch to KL and then inserting a red plastic key into a slot in the device. This key contained a strip of 5-level keytape about 10 cms long. When the CH/KL switch was returned to the CH position, the devices on the circuit, (there could be more than two), quietly went ahead and synchronized. When there was no real traffic to send, the machine continuously generated "dummy" traffic in order to maintain synchronization and to also confuse any "undesired" listeners.

On RTTY or RVOX circuits, the device had to be manually synchronized by means of a pushbutton, much in the same way as the KW-7.