GPS Timing Kit for Amateurs/Experimenters/Students/Scholars
Originally introduced in 2002, the Motorola M12+ GPS timing board remains one of the most accurate fixed position timing receivers available today. The M12+ Oncore can also be used for positioning and navigation applications. Synergy Systems, LLC incorporated the M12+ into a product called SynPaQ/E. Synergy Systems has made available to TAPR the following items which essentially make up a SynPaQ/E version XTS. These are currently available as a kit from TAPR. (kit items not sold separately) The condition of these parts would be considered used, but in good condition.
M12+ and the Motherboard
The first item is the motherboard that contains the various power and interface circuitry and the attached M12+ as shown in the image to the right. The motherboard operates from 9 to 32 VDC and provides conversion from 3 V logic levels to RS-232 levels.
Also in the picture is the interface cable. The DE-9M connector shown is not standard RS-232 wiring. The non-standard DE-9M connector wiring was originally established by Motorola to minimize connectors and associated wiring for one of its automotive products by providing signal and power connections in the same connector. One could modify this cable or build an adapter cable as shown below to separate the power from the signal leads.
The Motherboard slides into the housing's internal grooves. The front and rear panels are not included and must be fabricated by the user. A drawing for the front and rear panels is available here.
- M12+ Oncore GPS receiver already mounted on the mother board.
- Mother Board which provides power and signal interface to the M12+
- Interface Cable
- Housing without end plates
- Antenna Cable
- GPS Antenna - Motorola GCNAC1232A
DocumentationUser's Manual is here.
DIY Adapter Cable Suggestion
Rather than modify the included short interface cable, one can build an adapter cable like that shown in the image to the right using a DE-9F connector at the right end of the drawing and a DE-9M on the left end. You end up with a Y cable where one branch with the DE-9M is the PC connection and the other is the power connection with a connector of your choice. The + power wire for 9 to 30 VDC would be connected to pin 8 of the DE-9F and the GND wire would be connected to pin 7 of the DE-9F and go to a separate connector or power source. If operation from a regulated +5VDC is desired, then the + power wire would connect to pin 6 of the DE-9F connector and the GND wire would still go to pin 7 of the DE-9F. DO NOT use both power pins. Use either a 9-30 VDC power source or a regulated +5 VDC power source, not both. With this adapter cable, a standard RS-232 cable can be used for connection to a PC.
SupportSupport will be provided via the TACGPS Discussion List.
The price for the GPS Experimenter Kit is:
$ 30 USD
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Shipping and Handling
Shipping and Handling within the US will be by USPS Priority Mail.
International shipping costs are calculated as closely as possible. If the actual cost exceeds the estimate by more than $10.00, TAPR will contact you to get approval for the additional funds. TAPR uses insured Priority Mail International, unless the purchaser requires something else.