<div dir="ltr">Thanks to the advice above, my problems are resolved. Thanks all!<div><br></div><div>-Doug-</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Nov 16, 2017 at 6:44 PM, Chuck Henderson <span dir="ltr"><<a href="mailto:rpt2@chuck.midlandsnetworking.com" target="_blank">rpt2@chuck.midlandsnetworking.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I only use this Garmin (<span style="font-size:12.8px">GPS18x LVC, 5m)</span> 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. <span class="HOEnZb"><font color="#888888"><div>Chuck</div></font></span><span class=""><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Nov 16, 2017 at 9:58 AM, Lee Woldanski <span dir="ltr"><<a href="mailto:ve7fet@tparc.org" target="_blank">ve7fet@tparc.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Have you looked at:<div dir="auto"><br></div><div dir="auto"><a href="http://wiki.allstarlink.org/wiki/RTCM_Client#GPS" target="_blank">http://wiki.allstarlink.org/wi<wbr>ki/RTCM_Client#GPS</a><br></div><div dir="auto"><br></div><div dir="auto">Specifically, does this Garmin use 5V or 3.3V logic?</div><div dir="auto"><br></div><div dir="auto">I believe the RTCM uses 5V logic only (the VOTER) will do either. </div><div dir="auto"><br></div><div dir="auto">If your Garmin is 3.3V, it may have issues.</div><div dir="auto"><br></div><div dir="auto">Also, make sure the baud rate is correct, and it is configured to send the required NMEA sentences.</div><span class="m_4894306172277927644gmail-HOEnZb"><font color="#888888"><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto">Lee</div></font></span></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="m_4894306172277927644gmail-h5">On Nov 16, 2017 12:40 AM, "Doug Kingston" <<a href="mailto:dpk@randomnotes.org" target="_blank">dpk@randomnotes.org</a>> wrote:<br type="attribution"></div></div><blockquote class="m_4894306172277927644gmail-m_7884722926764058021quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div class="m_4894306172277927644gmail-h5"><div dir="ltr">I can't get the RTCM to recognize the attached GPS unit.<div>Reference: <a href="http://static.garmincdn.com/pumac/GPS_18x_Tech_Specs.pdf" target="_blank">http://static.garmi<wbr>ncdn.com/pumac/GPS_18x_Tech_Sp<wbr>ecs.pdf</a></div><div><br></div><div>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?</div><div><br></div><div>RTCM diagnostics complain:</div><div><div>Running Diagnostics...</div><div><br></div><div>Warning!! VF Diode NOT calibrated!!!</div><div><br></div><div>Testing PTT/External CTCSS</div><div>Error - Failed to read PTT/CTCSS in asserted state</div><div>Testing GPS UART</div><div>Error - Failed to read data from GPS UART</div></div><div><br></div><div>Any hints? or ways to get more diagnostics?</div><font color="#888888"><div><br></div><div>-Doug-</div></font></div>
</div></div></blockquote></div></div><br></blockquote><div> </div></div><br></div></span></div>
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