[time-nuts] Re: Need help to DATUM Power Supply MPS (Type MFS Modular Frequency Systems)

[paul swed]

Helmut.
Welcome to time-nuts.
Your pictures are very helpful.
May I suggest the easiest possible answer?
Simply supply 24 volts to the back connector. Guessing 4 amps.
If the system works you just have the AC supply to figure out.
Figuring out the AC supply seems reasonable as it appears from the pictures
to be several linear regulators. May be wrong but a guess. Maybe never fix
the AC and just use 24V.
You may have further challenges such as actually operating the receiver. I
have an austron GPSDO 2000 circa 1994 and honestly its great but a pain to
operate.
Modern GPSDOs are pretty much turn on lock and use. Very nice and spoiled.
Good luck
Paul
WB8TSL

On Thu, Jun 9, 2022 at 2:42 PM jung.schorndorf--- via time-nuts <
time-nuts at lists.febo.com> wrote:

> Dear hobby frequency and time device enthusiasts,
>
> I'm a German amateur radio listener, a retired electrical engineer and I'm
> an electronics hobbyist with a penchant for
> precise measurement technology. My modest systems are older and have
> defects
> again and again.
>
> During my long unsuccessful search for a technical detail on my defective
> power supply unit for the GPS frequency standard
> from DATUM (Type MFS Modular Frequency Systems), I visited your homepage
> and
> registered on "time-nuts" mailing list.
> .
> May I ask if you have a frequency system like this with better documents
> than I do?
> The problem is the defective mains transformer in the Power Supply MPS
> module. I'm looking for the data (voltage & current)
> to find the right one from my transformer collection.
> I can only measure a few coil resistances on the transformer, the primary
> coil doesn't work at all.
> Also, maybe someone has the circuit of the electronics board.
> Our German subsidiary DATUM-Symmetricom-Microchip no longer since 20 years
> has any documents.
>
> I also have 2 more DATUM GPS frequency standards (System 2000), the GPS/ED
> 167 from Meinberg/R&S and 2 DCF77
> frequency standards from Plisch (POG 110) and Hirschmann (NFA-NFE 800).
> Attached are photos of my defective power supply.
>
> I am happy about every answer.
> Best regards
>
> Helmut Jung
> GERMANY
>
>
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