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

[Chuck Henderson]

For the Garmin GPS18x LVC, 5m  to the RTCM, the following works for me:
I have green on  6, yellow on 7, shield and 1-small black and large black
on 8, white on 14, red on 13, 1-small black n/c.
You need to do the diode calibration procedure and then set the levels.
Hope this helps.
Chuck

On Thu, Nov 16, 2017 at 2:39 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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