[time-nuts] Re: Symmetricom XLi

[William Breidenthal]

My XLi has an X72 rubidium reference but the pinout should be the
same, it looks like a common interface board is used regardless of the
oscillator type. The J13 pinout, with Pin 1 being on the lower right and
Pin 10 being upper left, is:

Pins 1,2 are +12V
Pins 3,4 are GND
Pins 5,6 are -12V
Pins 7,8 are used to indicate which oscillator is installed
Pin 9 is the DAC output to the reference
Pin 10 is the lock detection input, driven from the reference (at least for
Rb)

Pin 7 shorted to ground with Pin 8 open indicates an OCXO
Pin 7 open with Pin 8 shorted to ground indicates a High Stability OCXO
Pins 7 and 8 shorted to ground indicate a Rubidium oscillator

William


> Date: Fri, 2 Jun 2023 23:10:15 +0200
> From: comsec22 <comsec22 at gmail.com>
> Subject: [time-nuts] Symmetricom XLi
> To: Discussion of precise time and frequency measurement
>         <time-nuts at lists.febo.com>
> Message-ID:
>         <CANbURZ_fU7DC-iq4tkhLXQbLitL3QwZw8ZPtgQYnNZsu7tMz=
> A at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> I am looking for a way to add the OCXO inside the receiver.
> There is a coax P2 on the daughter board for the 10 Mhz in plus J13 (5 +5
> pin).
> I guess P13 is feeding + 5 V, +12 V and - 12 V.
> A VCO signal to control the OCXO should be there too..
>
> Has anyone the same unit, at least to get a picture ? Unfortunately no
> drawings on the web.
>
> Cheers
>
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