[time-nuts] Re: TRAK Systems 8812

[marco bartoli]

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

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________________________________
From: paul swed <paulswedb at gmail.com>
Sent: Sunday, September 18, 2022 4:33:24 AM
To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
Cc: marco bartoli <marcobartoli64 at 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 at lists.febo.com<mailto:time-nuts at 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

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