<div dir="ltr">oh, wow! I just went into my source and see that apparently long ago I had made a similar change to my RTCM code that I had forgot about, but there it is. I must have run into this issue previously. hmmm. <div>By the way, I also added smart ID code to the RTCM for when it is offline so I don't have to hear it ID every 10 minutes or on top of people when it is offline. I see I didn't make it run time adjustable so maybe I should do that and then share it.</div><div>Chuck WB9UUS</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Apr 10, 2016 at 4:36 AM, 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">The timing of one second comes from the GPS satellites and is accurate. <span class="HOEnZb"><font color="#888888"><div>Chuck</div></font></span></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Apr 9, 2016 at 7:03 PM, Joe Leikhim <span dir="ltr"><<a href="mailto:rhyolite@leikhim.com" target="_blank">rhyolite@leikhim.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
According to the original documentation for the first generation X1
is a SER3418-ND 9.60MHz 18pf 30ppm. <br>
<br>
So 9.6 x (+/-) 30 = +/- 288 Hz.<br>
<br>
My question is If the same processor is doing the A/D conversion AND
checking the number of samples/second why would there be a
discrepancy regardless of the timing offset? Or is the error at the
receiving end??<div><div><br>
<br>
<br>
<br>
<div>On 4/9/2016 2:16 PM, James Cizek wrote:<br>
</div>
</div></div><blockquote type="cite"><div><div>
<div dir="ltr">Sure Willem, in voter.c, the stock line is:
<div><br>
</div>
<div>if ((samplecnt >= 7999) && (samplecnt <=
8001))<br>
</div>
<div><br>
</div>
<div>it needs to be changed to something like:</div>
<div><br>
</div>
<div>if ((samplecnt >= 7999) && (samplecnt <= 8003
))<br>
</div>
<div><br>
</div>
<div>That was just enough to make my first RTCM work. I've had
a chance now to check a few more of my RTCMs on the bench this
morning and the crystal frequencies are kind of all over. The
next one I had on the bench was 5.2Khz fast. The above code
was still not enough to fix it (as would be expected) so it
looks like the quality control on whatever manufacturer that
crystal is, isn't very good (or a low tolerance crystal is
being used). I am going to pursue crystal replacement to get
a highly accurate, stable, on-frequency crystal in there as my
first choice. Changing the firmware 5 different times doesn't
seem like the right answer.</div>
<div><br>
</div>
<div>Jim put that sanity check in there for a reason. Working
around it *may* allow the device to work, but to me, it seems
getting the hardware operating the way it was supposed to
originally is the better answer. I will follow up with
Micro-node and let you all know how it goes.</div>
<div><br>
</div>
<div>Thanks.</div>
<div><br>
</div>
<div>James</div>
<div>KI0KN</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Sat, Apr 9, 2016 at 9:05 AM, Willem
Schreuder <span dir="ltr"><<a href="mailto:willem@prinmath.com" target="_blank">willem@prinmath.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span>On Sat, 9 Apr 2016, James Cizek wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Jim helped adjust the code to be more tolerant of the
sampling error and my whole system instantly worked.<br>
</blockquote>
<br>
</span>
Could you please share the code adjustment for future
reference.<br>
<br>
================================================================<br>
Dr. Willem A. Schreuder, President, Principia Mathematica<br>
Address: 445 Union Blvd, Suite 230, Lakewood, CO 80228,
USA<br>
Tel: <a href="tel:%28303%29%20716-3573" value="+13037163573" target="_blank">(303) 716-3573</a> Fax: <a href="tel:%28303%29%20716-3575" value="+13037163575" target="_blank">(303) 716-3575</a><br>
WWW: <a href="http://www.prinmath.com" rel="noreferrer" target="_blank">www.prinmath.com</a> Email: <a href="mailto:Willem.Schreuder@prinmath.com" target="_blank"></a><a href="mailto:Willem.Schreuder@prinmath.com" target="_blank">Willem.Schreuder@prinmath.com</a><br>
</blockquote>
</div>
<br>
</div>
<br>
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