Author Topic: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)  (Read 174230 times)

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Offline NivagSwerdna

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #950 on: December 06, 2017, 04:18:06 AM »
I'm getting less optimistic... I powered the board from 6V but without the 12V boost converter in place and although I get flashing lights I am just getting garbage out of the serial pins... I thought this was 57600 8-N-1 but it seems to be not quite right... just gibberish.  I guess I will have to supply 12V and hope the behaviour changes.
 

Offline cdev

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #951 on: December 06, 2017, 10:11:35 AM »
Maybe try a slower speed.. my GPSDO's default is 9600 baud.
"What the large print giveth, the small print taketh away."
 

Offline NivagSwerdna

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #952 on: December 06, 2017, 11:18:23 AM »
Maybe try a slower speed.. my GPSDO's default is 9600 baud.
I tried all the baud rates I could imagine.  This is very strange.  I know there is a binary output mode... *(irig?) maybe it has switched.
 

Offline cdev

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #953 on: December 06, 2017, 11:24:37 AM »
Do you have a logic analyzer you can throw on it? Also, take a look at that huge header, there are multiple UARTS on some of those huge headers. There is a web site in the Ukraine which has traces of the header on the UCCM GPSDOs. You may have spare UARTS, or like ublox, different kinds of output might be redirect-able to different outputs, i.e. reconfigurable. That is quite likely.

Look at what Ublox does to get an idea of how they do it.
"What the large print giveth, the small print taketh away."
 

Offline NivagSwerdna

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #954 on: December 06, 2017, 10:51:02 PM »
Do you have a logic analyzer you can throw on it?
I have a scope which I should attach at some point.  The GPS is outputting sensible data and the on-board LEDs seem to be doing something.  I'm wondering if the CPU clock is derived from the OCXO... if so applying 12v will fix it.  This will have to wait... life is getting in the way.
 

Offline cdev

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #955 on: December 07, 2017, 03:04:09 AM »
Could you paste in a sample of what the GPSDO is outputting along withe the parameters its being captured at? Maybe its something we can figure out?
"What the large print giveth, the small print taketh away."
 


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