[time-nuts] TruePosition GPS Receiver

Bob kb8tq kb8tq at n1k.org
Tue May 9 20:17:48 EDT 2017


Often these guys use a “re-branded” driver for this or that. They then stop updating / supporting the driver. 
Theirs uses the same files as the “real” driver, but it is hopelessly out of date. You have seen the sort of issues
this can cause ….


> On May 9, 2017, at 7:02 PM, Ben Hall <kd5byb at gmail.com> wrote:
> Good evening Paul and list,
> So I've been working on the LMU300 tonight.
> On 5/6/2017 8:13 PM, ziggy9+time-nuts at pumpkinbrook.com wrote:
>> A couple of observations on the LMU300:
>> - the console port is the AEP port, a 6 pin RJ-11 - and you need a 6 pin connector
>> - the USB port is non-functional
> I decided to verify that the USB was non-functional...just in case your unit had an issue.  Wow I wish I had not!  Win7 started to install a driver, failed to install, then got BSOD.  Reboot...and immediate BSOD. After about an hour of troubleshooting I determined that somehow, and I don't know how this could happen, it corrupted the driver of my Prolific USB-to-Serial converter...as I determined that BSOD only happened when it was plugged in.  Had to flush out the driver and reload...and now all is well again.
> My LMU300's GPS never gets past the boot screen...but somehow...the GPS light goes green?  That GPS light must not really be looking at the GPS...or its more akin to a "GPS board seems present" versus "GPS is working, seeing satellites, etc..."
>>     - pin 5 or the third pin in the row closest to U19 is the 12v input (measured). the other 4 are all ground.
> Mine is 12VDC as well - right on the money too.  I thought 15 VDC was odd - the unit has 12VDC fans...why not have one 12 VDC supply and run both the fans and GPS unit from it?
>> - the 15 pin header:
>>     - pins 7 and 8 are 3.3v ttl level, and contain the same data as J2 pin 2
> Does this mean that pins 7 and 8 are a TTL serial RX/TX pair that function the same as J2...but without going thru the Sipex TTL-to-RS232 converter?  That would be a score for those of us who want to use these things with Arduinos.
> If I get up the courage after my BSOD fun...I may have to try it.
> Time to find that disposable laptop I've got somewhere around here... The LMU300 can BSOD that thing all it wants!  ;)
> thanks much,
> ben
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