[time-nuts] BG7TBL GPS Disciplined Source

Bryan _ bpl521 at outlook.com
Mon Mar 14 17:25:45 EDT 2016


There is a interesting hobbyist level GPS frequency generator project on utube. Not time nuts level, but a neat project nonetheless. Uses the Neo-7M. Three parts.
https://youtu.be/zZ6tc_ROdfU

-=Bryan=-

> Date: Mon, 14 Mar 2016 16:11:16 -0400
> From: time at patoka.org
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] BG7TBL GPS Disciplined Source
> 
> 
> I would say its even more convenient to monitor binary format, since its 
> more compact and could be read as a structures
> 
> // u-blox UBX protocol essentials
> 
> typedef struct ubx_header {
>          unsigned char preamble1;
>          unsigned char preamble2;
>          unsigned char msg_class;
>          unsigned char msg_id;
>          unsigned short length;
> } my_ubx_header;
> 
> typedef struct ubx_nav_timegps {
>          unsigned long iTOW_ms;
>          signed long fTOW_ns;
>          signed short week;
>          signed char leapS;
>          unsigned char valid;
>          unsigned long tAcc;
> } my_ubx_nav_timegps;
> 
> typedef struct ubx_nav_timeutc {
>          unsigned long iTOW_ms;
>          unsigned long tAcc_ns;
>          signed long nano;
>          unsigned short year;
>          unsigned char month;
>          unsigned char day;
>          unsigned char hour;
>          unsigned char min;
>          unsigned char sec;
>          unsigned char valid;
> } my_ubx_nav_timeutc;
> 
> and so on...
> 
> 
> On 2016-03-14 15:38, Björn wrote:
> > <div>-------- Originalmeddelande --------</div><div>Från: Gedas
> > <w8bya at mchsi.com> </div><div>Datum:2016-03-14  19:52  (GMT+01:00)
> > </div><div>Till: Discussion of precise time and frequency measurement
> > <time-nuts at febo.com> </div><div>Rubrik: Re: [time-nuts] BG7TBL GPS
> > Disciplined Source </div><div>
> > </div>
> > 
> > Who would have guessed a Russian OCXO.  And, I guess the U-Blox is not
> > one of the better GPS units based on what Paul mentioned.  But I think
> > there is software out there that will let me at least monitor what my
> > unit is doing and how many birds it is receiving data from.
> > 
> > Ublox makes excellent receivers. The monitoring software is fine.
> > 
> >     https://www.u-blox.com/en/product/u-center-windows
> > 
> > But they dont talk (old) scpi.
> > 
> > --
> >      Björn
> > _______________________________________________
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> 
> -- 
> WBW,
> 
> V.P.
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