Re: [time-nuts] time-nuts Digest, Vol 170, Issue 25

[paul swed]

That’s correct ax key

On Wed, Sep 12, 2018 at 12:53 PM Dan Kemppainen 
wrote:

> Bob,
>
> I think what you want is the SX-Key editor, which includes the compiler
> and programmer and help files.
>
> https://www.parallax.com/downloads/sx-key-editor-software
>
> In fact, just earlier today I programmed SX processor on a board...
>
> Dan
>
>
> On 9/12/2018 12:00 PM, time-nuts-requ...@lists.febo.com wrote:
> > Message: 3
> > Date: Tue, 11 Sep 2018 22:40:08 +0200
> > From: "Robert LaJeunesse"
> > To:time-nuts@lists.febo.com
> > Subject: Re: [time-nuts] Loran-C Simulation
> > Message-ID:
> >
>  
>  >
> >
> > Content-Type: text/plain; charset=UTF-8
> >
> > FWIW there exists an online reference for SX BASIC athttp://
> www.piclist.com/techref/parallax/sxb/sxb/___index.html  which may prove
> helpful in understanding the SX-B code.
> >
> > Unfortunately I can not find the SX-B BASIC compiler online anymore.
> http://www.parallax.com/sx/sxb.asp  is 404.
> >
> > Bob L.
>
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Re: [time-nuts] Loran-C Simulation

[paul swed]

I am on a business trip so that’s why not response
Airplane doesn’t make typing easy
I always try my darndest to keep it simple
The code will translate to radii our easily
As you see it’s bit sequences
Dumb simple stupid
Only a year or so ago I did my first arguing it was the Webb d poker very
good online help
It’s far shorter then you think
Arduino I see apples help

On Tue, Sep 11, 2018 at 6:08 PM Edesio Costa e Silva <
time-n...@tardis.net.br> wrote:

> Hello!
>
> I think you can get it from the Wayback Machine:
> <
> https://web.archive.org/web/20070207143220/http://www.parallax.com/sx/sxb.asp>.
> This
> is just one snapshot, there are other ones.
>
> Edésio
>
> On Tue, Sep 11, 2018 at 10:40:08PM +0200, Robert LaJeunesse wrote:
> > FWIW there exists an online reference for SX BASIC at
> http://www.piclist.com/techref/parallax/sxb/sxb/___index.html which may
> prove helpful in understanding the SX-B code.
> >
> > Unfortunately I can not find the SX-B BASIC compiler online anymore.
> http://www.parallax.com/sx/sxb.asp is 404.
> >
> > Bob L.
> >
> > > Sent: Tuesday, September 11, 2018 at 3:38 PM
> > > From: "gandalfg8--- via time-nuts" 
> > > To: time-nuts@lists.febo.com
> > > Cc: gandal...@aol.com
> > > Subject: [time-nuts] Loran-C Simulation
> > >
> > ...
> > > Having said that, I did take a look at your Basic code and must admit
> is does look pretty straightforward, even to me,
> > ...
> > >
> > > Nigel, GM8PZR
> >
> > ___
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Re: [time-nuts] PLL/GPSDO/etc learning resources for mere mortals

[Lars Walenius]

Hello Bryan,

As you indicate the new timing modules from uBlox like the 8-series and the 
Venus 838 could be better choices. I prefer the uBlox. I only recommended the 
NEO7M as it were cheap, available and is easy to use and at the same time gives 
good performance that I have measured. For simple position receivers with 1PPS 
I guess the ones from Adafruit is worth looking for even if not state of art 
for a GPSDO.

I am also curious about the Furano GT87 and hope that somebody will test it and 
give ADEV and MDEV's.

The nice thing with Lars GPSDO is that almost every GPS module with a 1PPS out 
can be used if the amplitude is 3.3-5V and the 1PPS is accurate on the positive 
going flank. The pulse width can be down to 10uS and probably even shorter. A 
square wave also works.

As you have a Jupiter-T I would definitely use that first. I started with even 
older and more jittery GPS modules and without timing mode and it worked. Of 
course a modern timing receiver will give better frequency accuracy and ADEV's 
but the loop should settle in the same time.

Lars

Från: Bryan _
Skickat: den 12 september 2018 09:39
Till: Discussion of precise time and frequency 
measurement
Ämne: Re: [time-nuts] PLL/GPSDO/etc learning resources for mere mortals

Hello:

Is there any other recommendations for a GPS receiver module, I note you 
recommend the Neo7M, but wondering if there are others that can be considered. 
Is there some better suited to supplying a frequency reference. There is also 
the 8M/T model(s) and the Venus, but not sure as to what 
advantages/disadvantages they have. I was going to start with a old Jupiter-T 
TU60-D120 module that I have as it has a 1pps output.


6.1.1 Pin J1-6: 1PPS output This signal is a positive going pulse with the 
leading edge being the point of measurement for synchronisation with the GPS 
satellite transmissions. The pulse width is approximately 26 ms.

Regards

-=Bryan=-


From: time-nuts  on behalf of Lars Walenius 

Sent: September 7, 2018 12:25 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] PLL/GPSDO/etc learning resources for mere mortals

I heard Jim mentioned my GPSDO. I would not go to the time nuts archive as that 
describes a far from ready software design. The hardware is almost identical. 
Last year I published a new design on EEVBlog:

https://www.eevblog.com/forum/projects/lars-diy-gpsdo-with-arduino-and-1ns-resolution-tic/?all

This is a, as I think, a much more robust design and much more tested. By just 
setting the”gain” it will make a stable 1Hz digital PLL. As the DAC can be set 
and you have a counter with 1ns resolution you don’t need any extra instruments 
to do this. The nice thing is that the controller is very flexible and can 
handle all kinds of 10MHz oscillators as XO, TCXO, OXCO and rubidium. The 
useful control range of the oscillators is 0.001-6ppm. As only a 1PPS with 
3.3-5V amplitude is needed a wide variation of GPS modules can be used. The 
time constant can be set from 4 to 32000 seconds and stored in EEPROM.

In the 21 pages of instruction I describe the design and also give performance 
data as both a GPSDO and a time interval counter. As Jim says my GPSDO gives 
useful information how you can do your own GPSDO. On the first pages I have 
some discussion of the GPS modules like NEO7M that can be used and also about 
different oscillators. Note I think the oscillators are the first you should 
think of as they set the most important specs for the GPSDO. See also the user 
manual for Stanford FS740 that contains a lot of information about a modern 
GPSDO. Here the link to Stanford FS740 seems to be broken in my instruction. 
Today this worked: https://www.thinksrs.com/downloads/pdfs/manuals/FS740m.pdf  
See for example pages 25-35 for a good description of the GPSDO part. In the 
end of the manual you also find complete schematics!

On pages 8-9 in my instruction you find a very short description of my software 
and it is a standard PI-loop with a low pass filter before just as in the 
FS740. Paul-Henning has a very simple introduction to the PI-loop that I like 
http://phk.freebsd.dk/time/20141018.html  . I would also recommend learning 
from the GPSDO simulator by Tom Van Baak 
http://www.leapsecond.com/pages/gpsdo-sim/   it also uses a PI-loop + low pass 
filter and his code tells you a lot.

>From Tom’s GPSDO simulator you can also learn how the time resolution and the 
>DAC resolution work with real time data. Magnus Danielsson in March 2014 
>published the result of some his simulations with different time and DAC 
>resolutions on time nuts. My takeaway was that a time resolution below 5-10ns 
>was ok and DAC resolutions in the ballpark of the oscillator ADEV was fine, 
>but have a look on his data.

On page 15 in my instruction you find a list of basic links that I have found 
useful. Some links 

Re: [time-nuts] time-nuts Digest, Vol 170, Issue 26

[Dave B via time-nuts]

Hi.

He does answer emails, I just had a similar exchange with him.

If your oscillator runs on a multiple of 25kHz, and cant wander close to
the next multiple, it'll probably work OK, but look at his web-page
before asking.

http://oz5n.dk/   Look at the PDF version, much easier on the eyes.

Regards.

Dave B.  (G0WBX)


On 13/09/18 17:00, time-nuts-requ...@lists.febo.com wrote:
> Subject: Re: [time-nuts] Looking for a reference oscillator called
>   XRef-VS made by VK3HZ for TS-2000
> Message-ID: <001301d44af2$5d71b0e0$185512a0$@splawn.ws>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi Bo,
> The AutoPLL does look promising.  I think I'll have a discussion with Steen
> about my application and perhaps order the unit for testing.
> Thank you for your input.  Much appreciated.
> 73
> Wayne, WA7NE

-- 
Created on and sent from a Unix like PC running and using free and open source 
software.
::

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Re: [time-nuts] Looking for a reference oscillator called XRef-VS made by VK3HZ for TS-2000

[Dave ZL3FJ]

There's a device- also originating in VK land-  in prototype testing phase
at present  that is similar to the x-Ref and reputed to be much cheaper. No
idea when it will be available.
73
 Dave, ZL3FJ


-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Wayne
Sent: Thursday, September 13, 2018 11:43
To: timen...@rudius.net; 'Discussion of precise time and frequency
measurement'
Subject: Re: [time-nuts] Looking for a reference oscillator called XRef-VS
made by VK3HZ for TS-2000

Hi Bo,
The AutoPLL does look promising.  I think I'll have a discussion with Steen
about my application and perhaps order the unit for testing.
Thank you for your input.  Much appreciated.
73
Wayne, WA7NE

-Original Message-
From: time-nuts  On Behalf Of Bo Hansen
Sent: Wednesday, September 12, 2018 1:43 AM
To: time-nuts@lists.febo.com
Subject: Re: [time-nuts] Looking for a reference oscillator called XRef-VS
made by VK3HZ for TS-2000

Hi Wayne

I am not 100% sure but can you use the this AutoPLL:


Availability: 

Bo, OZ2M

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