[BC] Secondary & Tertiary Tone

[Gary Glaenzer]

From: "Harold Hallikainen" <harold at hallikainen.com>
>
> For cart machines, primary (stop) tone was 1kHz. Secondary (EOM) tone was
> 150Hz. Tertiary (often used to advance slides on TV) was 8kHz. Logging was
> generally FSK at 3.5kHz.

Harold;

The older 'logging' system as used in the Gates SC-48 automation used 8 k tone

Of course, this was a VERY CRUDE set-up consisting of a 5-digit number, encoded as bursts
of 8k corresponding to each digit, and drove a decoder consisting of a telephone type
stepper driving a modified Victor adding machine with solenoids in place of number keys

All was well until the steppers (5 in the encoder and one in the decoder) got some wear on
them............

Somewhere. I have a slide picture, if I can find it I'll send it to you for inclusion on
your 'page of horrors'

Gary