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

[Doug Kingston]

Did you need to do the calibration before the GPS would show functioning?
I have not tackled the RF side yet.

-Doug-

On Thu, Nov 16, 2017 at 2:42 AM, Chuck Henderson <
rpt2 at chuck.midlandsnetworking.com> wrote:

> 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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