[time-nuts] Used ESE ES-911/GPS/NTP Master Time Clock

[Frederick Bray]

I picked up one of these and swapped out the GPS receiver, installing a 
Jackson Labs M12M replacement and temporarily using an external 6 volt 
SLA for backup.  The new receiver works fine, its on-board display shows 
that it sees a bunch of satellites and goes into hold.  However, I can't 
get a readable display on the ES-911 or the GPS lock LED to come on on 
the unit.

Has anyone else tried this or had display problems?

Thanks.

KE6CD

On 10/13/2019 3:07 PM, Gregory Beat via time-nuts wrote:
> Time Nuts —
>
> The ESE ES-911/GPS/NTP unit was specifically designed to meet the National Emergency Number Association (NENA) Standard NENA-04-002 for a Public Safety Answering Point (PSAP) Master Clock.  It traditionally provides “Time Synchronizing” all components of a PSAP.
> ==
> Used (surplus) ES-911/GPS/NTP units have appeared on eBay from an east coast reseller.  These units were likely surplussed, due to 1024 week rollover issues (GPS).
> NTP and PSAP usage (911 centers) require an accurate date.
>
> Two nice photos (on auction page) show inside of the rack cabinet.
> Some Highlights:
>
> * This ES-911/GPS/NTP model was replaced by ES-911E (new features, components) by the “ES-911E” production model.  Newer model has disciplined 10 MHz option (K-option).
>
> * Rack mount enclosure.  Plenty of Room for a DIY addition.
> * Units are powered by 6 Volts AC (coaxial connector, rear panel).
> * 12-channel GPS receiver (ESE normally used Motorola M12(+) receivers).
> Contact Art Sepin at Synergy for 1024 rollover or multi-GNSS receiver replacement.
> https://synergy-gps.com/products/gps/timing-boards-modules/
>
> * 10Base-T port (10 Mbps) for Network Time Protocol (NTP) usage.
> ESE formally use WizNet for that plug-in PCB (current vendor ?).
> ES-911 can serve as local time server (NTP) for home network (TCP/IP).
>
> * 6 Volt battery (under aluminum bracket in eBay photos),
> Digi-Key P128-ND, Panasonic LC-R061R3P
> Assume the battery is dead and replace with fresh one, $12.84 USD
>
> * Unit has 1 PPS as well as time-code outputs for remote time displays (useful).
>
> ESE ES-911 Product Sheet (copy not downloadable, from ESE web site)
> http://a2dcorp.us/pdf/ese/ES-911%2520GPS%2520NTP.pdf
>
> After you have purchased ES-911/GPS/NTP, Contact ESE Support (with product SN).
> ESE can provide (via email) the PDF of Product Manual with Schematic diagram and Parts List.  BONUS: Parts are listed for the Options (ESE uses common PCB).
>
> Firmware is password protected (ESE intellectual property) and Flashed/EEPROM in the often Intel MCS-51 (8051) processor.
> ==
> Greg, w9gb
> Chicago
>
> Sent from iPad Air
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