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

[Frederick Bray]

Finally received my replacement batteries and a suitable wall-wart.

After installing the batteries and initialization as per the instructions posted to the list, it started working correctly with the original receiver.

Thanks to all who helped.

F.W.Bray

> On Nov 26, 2019, at 2:04 PM, Frederick Bray <fwbray at mminternet.com> wrote:
> 
> 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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