[time-nuts] TruePosition GPS Receiver

Bob kb8tq kb8tq at n1k.org
Sat May 6 17:07:44 EDT 2017


Digging a bit more into this and that:

The board in this writeup:

http://www.qsl.net/wa2omy/A%20Packrat%20GPS%20Receiver%20Project.pdf <http://www.qsl.net/wa2omy/A%20Packrat%20GPS%20Receiver%20Project.pdf>

Has 2005 firmware in it (6 years before our boards). It was built at the end of 2006 (again about 
6 years earlier). The connectors on the board are nothing like the connectors on the 
boards I have. No idea when the earlier board was designed, the area that shows that data 
on the later board is blank on the earlier board. 

It is the same board as shown here in the PackRat stuff:

http://www.packratvhf.com/A%20Packrat%20GPS%20Receiver%20Project.pdf <http://www.packratvhf.com/A%20Packrat%20GPS%20Receiver%20Project.pdf>

Since the boards (and firmware) are very different, I would be careful about taking all
that is said in the previous write ups as valid. Pretty much everything needs to be checked. 
Both the FPGA and the MCU went through major changes between the two boards. The 
temperature sensor is very different on the newer design (if it’s even there on the old one ..).
They certainly share a common heritage. There are some major differences ( three coax
outputs vs 2 …missing connectors …..).


> On May 6, 2017, at 11:29 AM, Ben Hall <kd5byb at gmail.com> wrote:
> Hi Bob, Mark, and list,
> Thanks for the messages on these units - especially the differences between the PackRat instructions and these boards.  I should have one of the "bare board" units and one of the LMU300 TruePosition rack mount units here on Monday as long as nothing happens in transit.
> I've still had no luck contacting the authors of the PackRat presentation, even after finding a new address for the one that bounced.  I'm hopeful that they are just busy during the week and we may see a reply now that it is the weekend.
> Anyone had time to hook up a serial interface?  I'm curious if you issues something like a "help" command...will the unit tell you what its command set might be?  That would be nice.  I've had ZERO luck finding any information either on the TruePosition unit or the Furuno GPS used.
> thanks much and 73,
> ben, kd5byb
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