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MB

marco bartoli

Sat, Sep 17, 2022 12:53 PM

Even if I receives the six satellites correctly, apart from the week roll over issue, I never have the LOCKED led on the front panel.
So seems PLL circuit doesn't work at all.
If I try to set new value from the terminal I got ok message as response, but on the display ( DAC REF 2050 OSC CAL OK) .. I did not find any DAC, and this is the reason why the reference voltage on the rubidium didn't change
Since some ic are not in place, just the socket, I am start wondering if this are optional or not.

Attached a picture of my 8812 main board, where some ic seems.to miss.

U12, U25, U45, U46.

Can some good soul, send me a picture or tell me which ic should be in place ??

Thank You indeed

Even if I receives the six satellites correctly, apart from the week roll over issue, I never have the LOCKED led on the front panel. So seems PLL circuit doesn't work at all. If I try to set new value from the terminal I got ok message as response, but on the display ( DAC REF 2050 OSC CAL OK) .. I did not find any DAC, and this is the reason why the reference voltage on the rubidium didn't change Since some ic are not in place, just the socket, I am start wondering if this are optional or not. Attached a picture of my 8812 main board, where some ic seems.to miss. U12, U25, U45, U46. Can some good soul, send me a picture or tell me which ic should be in place ?? Thank You indeed

PS

paul swed

Sun, Sep 18, 2022 2:33 AM

Marco I strongly speculate that the 40 pin chip and the two below it may be
an optional gpib going to the header. It just sort of typically looks like
that layout. Total guess.
Regards
Paul
WB8TSL

On Sat, Sep 17, 2022 at 5:22 PM marco bartoli via time-nuts <
time-nuts@lists.febo.com> wrote:

Even if I receives the six satellites correctly, apart from the week roll
over issue, I never have the LOCKED led on the front panel.
So seems PLL circuit doesn't work at all.
If I try to set new value from the terminal I got ok message as response,
but on the display ( DAC REF 2050 OSC CAL OK) .. I did not find any DAC,
and this is the reason why the reference voltage on the rubidium didn't
change
Since some ic are not in place, just the socket, I am start wondering if
this are optional or not.

Attached a picture of my 8812 main board, where some ic seems.to miss.

U12, U25, U45, U46.

Can some good soul, send me a picture or tell me which ic should be in
place ??

Thank You indeed

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

Marco I strongly speculate that the 40 pin chip and the two below it may be an optional gpib going to the header. It just sort of typically looks like that layout. Total guess. Regards Paul WB8TSL On Sat, Sep 17, 2022 at 5:22 PM marco bartoli via time-nuts < time-nuts@lists.febo.com> wrote: > Even if I receives the six satellites correctly, apart from the week roll > over issue, I never have the LOCKED led on the front panel. > So seems PLL circuit doesn't work at all. > If I try to set new value from the terminal I got ok message as response, > but on the display ( DAC REF 2050 OSC CAL OK) .. I did not find any DAC, > and this is the reason why the reference voltage on the rubidium didn't > change > Since some ic are not in place, just the socket, I am start wondering if > this are optional or not. > > Attached a picture of my 8812 main board, where some ic seems.to miss. > > U12, U25, U45, U46. > > > Can some good soul, send me a picture or tell me which ic should be in > place ?? > > Thank You indeed > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

MB

marco bartoli

Sun, Sep 18, 2022 6:09 AM

Thank You Paul, I guess too that is for GPIB.
Having the type of chip could be easy to add this interface too. Just if You need.

The one I got seems have a special firmware, having the HQ (only) code out.. this is what I need for my test.

Cheers

Ottenere Outlook per Androidhttps://aka.ms/AAb9ysg

From: paul swed paulswedb@gmail.com
Sent: Sunday, September 18, 2022 4:33:24 AM
To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com
Cc: marco bartoli marcobartoli64@outlook.com
Subject: Re: [time-nuts] TRAK Systems 8812

Marco I strongly speculate that the 40 pin chip and the two below it may be an optional gpib going to the header. It just sort of typically looks like that layout. Total guess.
Regards
Paul
WB8TSL

On Sat, Sep 17, 2022 at 5:22 PM marco bartoli via time-nuts <time-nuts@lists.febo.com mailto:time-nuts@lists.febo.com> wrote:
Even if I receives the six satellites correctly, apart from the week roll over issue, I never have the LOCKED led on the front panel.
So seems PLL circuit doesn't work at all.
If I try to set new value from the terminal I got ok message as response, but on the display ( DAC REF 2050 OSC CAL OK) .. I did not find any DAC, and this is the reason why the reference voltage on the rubidium didn't change
Since some ic are not in place, just the socket, I am start wondering if this are optional or not.

Attached a picture of my 8812 main board, where some ic seems.tohttp://seems.to miss.

U12, U25, U45, U46.

Can some good soul, send me a picture or tell me which ic should be in place ??

Thank You indeed

time-nuts mailing list -- time-nuts@lists.febo.com mailto:time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com mailto:time-nuts-leave@lists.febo.com

Thank You Paul, I guess too that is for GPIB. Having the type of chip could be easy to add this interface too. Just if You need. The one I got seems have a special firmware, having the HQ (only) code out.. this is what I need for my test. Cheers Ottenere Outlook per Android<https://aka.ms/AAb9ysg> ________________________________ From: paul swed <paulswedb@gmail.com> Sent: Sunday, September 18, 2022 4:33:24 AM To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> Cc: marco bartoli <marcobartoli64@outlook.com> Subject: Re: [time-nuts] TRAK Systems 8812 Marco I strongly speculate that the 40 pin chip and the two below it may be an optional gpib going to the header. It just sort of typically looks like that layout. Total guess. Regards Paul WB8TSL On Sat, Sep 17, 2022 at 5:22 PM marco bartoli via time-nuts <time-nuts@lists.febo.com<mailto:time-nuts@lists.febo.com>> wrote: Even if I receives the six satellites correctly, apart from the week roll over issue, I never have the LOCKED led on the front panel. So seems PLL circuit doesn't work at all. If I try to set new value from the terminal I got ok message as response, but on the display ( DAC REF 2050 OSC CAL OK) .. I did not find any DAC, and this is the reason why the reference voltage on the rubidium didn't change Since some ic are not in place, just the socket, I am start wondering if this are optional or not. Attached a picture of my 8812 main board, where some ic seems.to<http://seems.to> miss. U12, U25, U45, U46. Can some good soul, send me a picture or tell me which ic should be in place ?? Thank You indeed _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com<mailto:time-nuts@lists.febo.com> To unsubscribe send an email to time-nuts-leave@lists.febo.com<mailto:time-nuts-leave@lists.febo.com>