> I had hoped the frequencies listed on the controls might trigger some association in someone who's knowledgable about time-codes. 250 Hz
> doesn't seem to be a legal IRIG time-code frequency, although 1 kHz is. I'd try feeding it with various frequencies as others have suggested and see what happens. It's unlikely to have been used with other time codes such as SMPTE. I have an earlier unit made by Datachron, now defunct, which looks superficially similar but uses DTL logic. Mine is definitely an IRIG decoder and the funny filter frequencies may have been meant for manually shuttling tapes at non standard speeds. After a lot of messing around (a story in itself) I have resurrected mine and use it as a nixie clock, fed with IRIG B generated by a modern micro from the output of a GPS receiver. There's more logic in the $9 AVR chip than the whole IRIG decoder which would have cost thousands when it was new! And while I'm on the subject, anyone got any DTL JK flip flops to spare to keep the old box going? I've had to replace quite a few chips which probably died when the device was fed with higher than specified mains voltage in its early life. The +5V supply was unregulated :-( Morris VK3DOC Melbourne, Australia _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.