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

[Wayne]

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

[Dan Kemppainen]

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] Looking for a reference oscillator called XRef-VS made by VK3HZ for TS-2000

[Bo Hansen]

Hi Wayne

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


Availability: 

Bo, OZ2M

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[time-nuts] Loran-C Simulation

[gandalfg8--- via time-nuts]

Thanks to Robert and Edesio I now have all the Parallax tools, which I must 
admit I thought were also lost.


Fortunately there's no immediate panic with Anthorn still running for now so 
I'll still take a look at a possible
Arduino alternative, but will also keep hunting for a live SX-B28:-)


Nigel, GM8PZR

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Re: [time-nuts] PLL/GPSDO/etc learning resources for mere mortals

[Bryan _]

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 seems broken so for example for Stanford’s you have to find 
again on their homepage.

On pages 16-17 you find help commands and description of serial information. By 
the way Mark Sims excellent LH can read this and use the time, DAC and 
temperature data that are spit out every second 
http://www.eevblog.com/forum/metrology/lady-heather-v6-beta-for-windows-exe/?all
  . This together with the GPS module of choice serial output data should make 
this very useful. I am sorry I haven’t used this as I am very weak of chemo and 
haven’t done anything to my GPSDO for a long time.

Page 18 shows setup to read for example DAC data into Timelab.

On page 19 you find some ADEV results of two of my prototype GPSDO’s. One with 
a TCXO DOT050V and one with a OCXO 131(that by purpose uses a bad DAC 
resolution of 1.2E-11 but still gets ADEV’s in the 5E-12 range.

Last two pages show data with the controller used as a time interval counter. 
By measuring the TIC with a PICDIV PD26 it is possible to enter a few 
linearization parameters in EEPROM and get ADEV’s in the 8E-10 range at 1sec.

Even if I don’t recommend reading specific about my GPSDO on time nuts I really 
recommend to search and read the time nuts archive. It is a lot of useful 
information and a special thank to Bob kb8tq who contributes with so much 

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

[Wayne]

Greetings,

 

The XRef-VS is no longer in production but I'm hoping someone has one they
don't need and would like to sell.

This is an external osc for the Kenwood TS-2000.

 

Tnx,

Wayne / WA7NE

 

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