[App_rpt-users] Trouble with RTCM and Garmin GPS (18x LVC)

[Doug Kingston]

Thanks for the pointer to the GPS writeup.  I had missed this.  Will review
and see where I get.

On Thu, Nov 16, 2017 at 7:58 AM, Lee Woldanski <ve7fet at tparc.org> wrote:

> Have you looked at:
>
> http://wiki.allstarlink.org/wiki/RTCM_Client#GPS
>
> Specifically, does this Garmin use 5V or 3.3V logic?
>
> I believe the RTCM uses 5V logic only (the VOTER) will do either.
>
> If your Garmin is 3.3V, it may have issues.
>
> Also, make sure the baud rate is correct, and it is configured to send the
> required NMEA sentences.
>
>
> Lee
>
> On Nov 16, 2017 12:40 AM, "Doug Kingston" <dpk at randomnotes.org> wrote:
>
> I can't get the RTCM to recognize the attached GPS unit.
> Reference: http://static.garmincdn.com/pumac/GPS_18x_Tech_Specs.pdf
>
> I have determined that pin6 on the DB15 of the RTCM is transmit data to
> the GPS (using an oscilloscope) and that's hooked to the RxData line of the
> Garmin (green).  Will the Garmin respond if it does not have lock?
>
> RTCM diagnostics complain:
> Running Diagnostics...
>
> Warning!! VF Diode NOT calibrated!!!
>
> Testing PTT/External CTCSS
> Error - Failed to read PTT/CTCSS in asserted state
> Testing GPS UART
> Error - Failed to read data from GPS UART
>
> Any hints? or ways to get more diagnostics?
>
> -Doug-
>
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