Author Topic: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)  (Read 450722 times)

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Offline davebb

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Hi Jim
If you find it is a Z04 Inverter, I can send you one, as I have
Some left after fixing mine
Dave 2E0DMB
 

Offline grumpydoc

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This is U26, not sure what it is:


My guess would be a single gate and given the "08" marking probably a single AND gate.
 

Offline PA0PBZ

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My guess would be a single gate and given the "08" marking probably a single AND gate.

Yes, that would be a good guess. I could of course take it from the pcb, power it up and measure what it does but it is too small for my old eyes  :(
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Offline grumpydoc

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Yes, that would be a good guess. I could of course take it from the pcb, power it up and measure what it does but it is too small for my old eyes  :(
With you on that one - I can barely do anything electronic without a stout magnifying glass :(
 
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Offline Macbeth

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FWIW mine is marked T08B (or T088) and has 3 dots all in line from bottom left.
 

Offline PA0PBZ

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FWIW mine is marked T08B (or T088) and has 3 dots all in line from bottom left.

Interesting, T08 SOT-753 is a  74HCT1G08GV, AND gate indeed.
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Offline GI1CET

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Dave, 2E0dmb

No its not, I just didn't play with the lighting when taking the photo ;-)

Jim, GI1CET
 

Offline GI1CET

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All

Thanks for that incredibly useful info  i will source some 74HCT1G08GV and get the iron hot, many thanks

will report results here but it may be delayed as I am back and forth to the Mainland non stop for the next few weeks so not much time to play ;-)

Jim, GI1CET
 

Offline pmcouto

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Hi,

My board is missing U9…

Looking at the picture here https://www.eevblog.com/forum/projects/a-look-at-my-symmetricom-gpsdo-(ocxo-furuno-receiver)/msg924815/#msg924815
the marking on that little 5 pin SMD IC seems to be 10CB, 10C8 or 1DCB.

Could you please take a look at your boards and let me know the correct SMD marking on this IC?
 

Offline PA0PBZ

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the marking on that little 5 pin SMD IC seems to be 10CB, 10C8 or 1DCB.

I sent that board back but I had another picture which I think shows 19CB. The one on the board I have here says AAAV.


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Offline Nuno_pt

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pmcouto, in the end of the day I will see my board what is there.
Nuno
CT2IRY
 

Offline Bryan

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Whereabouts on the board is U9 and I will check mine if it helps. Mine arrived complete and working.
-=Bryan=-
 

Offline kutte

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if you want some monitoring software running under windows, here it is:
http://www.romahn.info/symmetricom/Z38SY.ZIP
I've patched Ulrich Bangert's famous Z38XX to at least partially work with our Symmetricom UCCM-P.
For use first set the right "parameters" i.e. your com-port and hit ok.
Try the various functions under the "view" tab.
Kutte

 
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Offline Bryan

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Slick, will have to give it a try. Miss the Lady Heather program.
-=Bryan=-
 

Offline SHF

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if you want some monitoring software running under windows, here it is:
http://www.romahn.info/symmetricom/Z38SY.ZIP
I've patched Ulrich Bangert's famous Z38XX to at least partially work with our Symmetricom UCCM-P.
For use first set the right "parameters" i.e. your com-port and hit ok.
Try the various functions under the "view" tab.
Kutte
Hallo Kutte super Programm  :-+ :-+ :-+ :-+, vielen Dank hier für das posten !!!
Gruß Dieter
 

Offline Macbeth

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I sent that board back but I had another picture which I think shows 19CB. The one on the board I have here says AAAV.
Can confirm - 19CB on mine.
 

Offline Macbeth

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if you want some monitoring software running under windows, here it is:
http://www.romahn.info/symmetricom/Z38SY.ZIP
I've patched Ulrich Bangert's famous Z38XX to at least partially work with our Symmetricom UCCM-P.
For use first set the right "parameters" i.e. your com-port and hit ok.
Try the various functions under the "view" tab.
Kutte
This is great! I assume by patched you used a hex editor to fix some strings vs compiling unobtanium source code?

I had just started writing something similar in C#.NET too...

Unfortunately the main PPS TI & EFC window doesn't update, and the Time Stability and "Nixie" Clock are greyed out too :( Looking at the debug log the EFC values are being queried and coming back with sensible values ok. Is there an obvious reason why these don't work other than the great difficulty in reverse engineering the original?
 

Offline Macbeth

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You can also adjust the RS232 header to a different baud rate by using one of the two and select your baud rate.

SYSTem:COMMunication:SERial1:BAUD 9600|19200|38400|57600
or
SYSTem:COMMunication:SERial2:BAUD 9600|19200|38400|57600

I think it's the second one.

It is the SER2 that is the RS232 header.

Quote
Just a note your settings won't stick after a reboot, although I think the following may store the setting, just never tried it

SYSTem:COMMunication:SERial1:PRESet
SYSTem:COMMunication:SERial2:PRESet

Nope. These restore to factory default 57600,8,N,1

How do I know this? Because for some reason I get lots of line noise at 57600 baud (reminds me of my 1200 baud dial up modem days!). I use SYST:COMM:SER2:BAUD 19200 and all is ok but of course I have to reconnect after issuing that command.

This is possibly a fault of my cheap-ass CH340 USB/RS232 adapter.
 

Offline kutte

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This is great! I assume by patched you used a hex editor to fix some strings vs compiling unobtanium source code?

I had just started writing something similar in C#.NET too...

Unfortunately the main PPS TI & EFC window doesn't update, and the Time Stability and "Nixie" Clock are greyed out too :( Looking at the debug log the EFC values are being queried and coming back with sensible values ok. Is there an obvious reason why these don't work other than the great difficulty in reverse engineering the original?

hi Macbeth,
I've made similar patches for my Lucent KS-24361 GPSDO and that worked in all aspects you are missing now. But the Symmetricom UCCM's command set differs in too many aspects from the original Z38xx command sets, so I could not put to work more than what is available. And yes, you are right, the sources of Ulrich's Z38xx are unobtainium. If anyone wants more functionality he (she) is free to do more reverse engineering and should tell us about any success.
Kutte
 

Offline kutte

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Stability and "Nixie" Clock are greyed out too :( Looking at the debug log the EFC values are being queried and coming back with sensible values ok. Is there an obvious reason why these don't work other than the great difficulty in reverse engineering the original?

I am missing that information too. The reason seems to be, that the Symmetricom does not deliver the appropriate timing data and additionally always appends an unwanted "Command Complete" string to any command given.

I did also not succeed to put time/date date into the Symmetricom to speed up satellite aquisition.
GPS:INITial:DATE 2016,1,29   // does not work (legal syntax but no effect)
GPS:INITial:TIME 23:59:01   // does not work (legal syntax but no effect)
GPS:INITial:POSition N,+52,+etc,E,+13,+etc // works ok
Kutte

 

Offline deepskyridge

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I am thinking of picking up one of these, do you guys have any documentation ?

I don't want to read all 20 pages of this thread.

Thanks
Gary
 

Offline ghulands

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I am thinking of picking up one of these, do you guys have any documentation ?

I don't want to read all 20 pages of this thread.

Thanks
Gary

Click the All next to the page numbers, then it's only a single page!  :-DD
 

Offline Macbeth

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I am thinking of picking up one of these, do you guys have any documentation ?

I don't want to read all 20 pages of this thread.

Thanks
Gary

Maybe, unlike all of us, you can find the official manuals and datasheets? - I believe Penguin published a compendium but I haven't found much more than a book cover teaser myself...



I've rifled through dusty old bookshops high and low, but to no avail... I did find "Fly Fishing by J.R. Hartley" though  :-+
« Last Edit: May 10, 2016, 09:18:41 pm by Macbeth »
 

Offline NivagSwerdna

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I found everything I needed, including links to various bits of documentation in the thread.
 

Offline Nuno_pt

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+1 for that.

But it requires time to read. 

Nuno
CT2IRY
 


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