1123-A

The General Radio 1123-A Digital Syncronometer was introduced in Catalog S (1965) and remained available until Catalog U (1970).

It is basically a digital clock with circuits that enable it to be synchronised with standard time signals, originally intended to be used in conjunction with an 1124 time signal receiver system.

The 1123-A has three digitally delayed outputs, with delays selectable by thumbwheel switches.

To check the frequency of a signal (e.g. a 1 MHz standard), that frequency it is divided down and used as an external reference to the 1123-A.

The first sync output is used to trigger an oscilloscope, which displays the Loran C (or WWV signal). The delay of the second pulse is adjusted with the 1123A controls to be coincident with a peak or a zero crossing of the reference signal, e.g. Loran-C.