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

[Doug Kingston]

Thanks to the advice above, my problems are resolved.  Thanks all!

-Doug-


On Thu, Nov 16, 2017 at 6:44 PM, Chuck Henderson <
rpt2 at chuck.midlandsnetworking.com> wrote:

> I only use this Garmin (GPS18x LVC, 5m) and have no problem with the
> RTCM.  I got most of them many years ago but the last one I bought in 2016
> and it worked fine also. I just hook them up and they work.  I have not
> looked at the pulse with a scope.  I recall there is a JP4 that can be
> changed in the RTCM.  In one position, (1-2), it has thresholds of less
> than  0.8v and greater than 2.0V and is +-25v tolerant and in the other
> default position (2-3) it should be standard TTL input and 0 to 5 volt
> tolerant.
> Chuck
>
> On Thu, Nov 16, 2017 at 9:58 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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