[time-nuts] Re: Trak 8812 Station Clock

[Gregory Beat]

Ron -

An earlier thread about the TRAK Systems 8810 (time-nuts archive: 2008-2011).
VK3XYZ received the 8812 Manual, from the company, at that time.
https://www.mail-archive.com/search?l=time-nuts@febo.com&q=subject:%22%5Btime-nuts%5D+TRAK+8810%22&o=newest&f=1

Internal Photos of the TRAK 8812 GPS Station Clock (Trak Microwave, Tampa, FL)
You can confirm size of GPS receiver and # positions on header interface.
http://www.leapsecond.com/museum/trak8812/

Based on the Trak 8820 manual, the layout/parts are similar (early 1990s).
The Trak GPS receiver appears to have used the Magnavox MX4200 Navigation 6-channel Receiver, with a 20-pin interconnect header to the “main board”.  

Many of the OEM from that period (Rockwell, Magnavox, Motorola, etc.) were acquired by other companies OR left the GPS receiver market.  In this case, 
Magnavox was acquired by Leica’s Geosystems group (now part of Hexagon)
https://leica-geosystems.com/en-us/products/gnss-systems/receivers

Some “new tech” replacement receivers for Trimble (HEOL Design, France) 
https://www.heoldesign.com/-Trimble-GPS-replacement-boards-

NAELCOM (France) for the Trimble Lassen series and form factors
http://naelcom.com/165-boards-enclosures
For European readers, Recab in the UK is a Naelcom partner.
https://www.recabuk.com/partners/

and Motorola Oncore / M12 (Synergy Systems LLC, San Diego).
https://synergy-gps.com/
—
The rollover issue could likely be addressed by Lady Heather software (for PC monitoring).  A replacement GPS receiver (interface compatible) would be required for multi-channel GNSS and possibly firmware changes to main board for full functionality.

Good luck with your project.

greg, w9gb
chicago
===
Date: Wed, 16 Jun 2021 12:59:20 -0400
From: Roland Ude <buzz at baylorhill.com>
Subject: [time-nuts] Trak 8812 Station Clock
To: time-nuts at lists.febo.com

I just acquired two each 8812 Station Clocks.
I am looking for operating manuals, command structure, and supporting information. I've powered up the first unit - achieved lock but has roll over issues. 
All help and support information is greatly appreciated.
— Buzz W8BUZ, buzz at baylorhill.com or 937-605-4951.