Discussion:
ESE ES-185A Master Clock plus displays
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Gregory Beat via time-nuts
2018-08-09 02:19:46 UTC
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For the time-nut that can never have enough digital displays (Mark Sims?),
this used ES-185A Master Clock appeared on eBay, auction number: 232878690675
with additional display units.

ESE ES-185A manual
http://www.drivehq.com/file/df.aspx/shareID3748302/fileID591944211

The ES-185A Master Clock appears to use a Motorola GPS receiver.
Options include ES-AB1A (power divider) and Raven LA-12F (in-line amp).
https://www.navtechgps.com/assets/1/7/LA-12-1575-100_AndALLChild_DS1.PDF
Multiple rear panel outputs, time code formats, 10 MHz, and BCD.

ES-185A manual includes the schematics, board layouts and parts list.
Maxim (former Dallas) DS87C520 is main processor (MCS-51 family).
https://datasheets.maximintegrated.com/en/ds/DS83C520-DS87C520.pdf
ESE uses 8051 (MCS-51) firmware for majority of their products (time code displays, etc.)

Greg, w9gb
chicago





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