[App_rpt-users] RTCM voter problem - SOLVED

[Chuck Henderson]

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.
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.
Chuck  WB9UUS


On Sun, Apr 10, 2016 at 4:36 AM, Chuck Henderson <
rpt2 at chuck.midlandsnetworking.com> wrote:

> The timing of one second comes from the GPS satellites and is accurate.
> Chuck
>
> On Sat, Apr 9, 2016 at 7:03 PM, Joe Leikhim <rhyolite at leikhim.com> wrote:
>
>> According to the original documentation for the first generation X1 is a
>> SER3418-ND 9.60MHz 18pf 30ppm.
>>
>> So 9.6 x (+/-) 30 = +/- 288 Hz.
>>
>> 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??
>>
>>
>>
>>
>> On 4/9/2016 2:16 PM, James Cizek wrote:
>>
>> Sure Willem,  in voter.c, the stock line is:
>>
>> if ((samplecnt >= 7999) && (samplecnt <= 8001))
>>
>> it needs to be changed to something like:
>>
>> if ((samplecnt >= 7999) && (samplecnt <= 8003 ))
>>
>> 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.
>>
>> 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.
>>
>> Thanks.
>>
>> James
>> KI0KN
>>
>> On Sat, Apr 9, 2016 at 9:05 AM, Willem Schreuder <willem at prinmath.com>
>> wrote:
>>
>>> On Sat, 9 Apr 2016, James Cizek wrote:
>>>
>>> Jim helped adjust the code to be more tolerant of the sampling error and
>>>> my whole system instantly worked.
>>>>
>>>
>>> Could you please share the code adjustment for future reference.
>>>
>>> ================================================================
>>> Dr. Willem A. Schreuder,  President,  Principia Mathematica
>>> Address:  445 Union Blvd, Suite 230,  Lakewood, CO  80228, USA
>>> Tel: (303) 716-3573   Fax: (303) 716-3575
>>> WWW: www.prinmath.com   Email: <Willem.Schreuder at prinmath.com>
>>> Willem.Schreuder at prinmath.com
>>>
>>
>>
>>
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>>
>> --
>> Joe Leikhim
>>
>>
>> Leikhim and Associates
>>
>> Communications Consultants
>>
>> Oviedo, Florida
>> JLeikhim at Leikhim.com
>> 407-982-0446
>> WWW.LEIKHIM.COM
>>
>>
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