Signalling Unit (FSG)

[M1ECY]

One of the items required for Telex operation, that normally is not needed for RTTY is known as a signalling unit (in the UK) or an FSG in Germany.

These are very rare in the UK, I have only ever seen a handful of them, and all but 1 are in a museum.

So, for the UK teleprinters a problem exists - what to do when you cannot find one of these units?

Fred has written FSG - O - FSG firmware for the TW 39 cards - will this also work for the Double Current cards?

Is there a way that the interface card could provide switching of a relay to control the power to the machine?

Or, a more ambitious project, using the attached document, is there a way that the signalling unit could be simplified and made using modern components?

[M1ECY]

Some pictures of the signalling units commonly found in use with the Creed 444. For the cases where the machine has a dial integral to the Teleprinter, the control unit electronics are hidden in the stand!

Enjoy

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[M1ECY]

Perhaps a Schematic would be useful for the above unit