Empathy List Archives

JS

jung.schorndorf@t-online.de

Thu, Jun 9, 2022 2:26 PM

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

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

PS

paul swed

Thu, Jun 9, 2022 6:57 PM

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@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

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

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

WB

Wilko Bulte

Thu, Jun 9, 2022 9:29 PM

Quoting jung.schorndorf--- via time-nuts, who wrote on Thu, Jun 09, 2022 at 04:26:08PM +0200 ..

hello Helmut,

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 have been looking for the same information in every corner of the Internet
but never found any schematics unfortunately..

But I happen to have the same PSU, a bit older even, as it is labeled
Efratom. A working one fortunately!

So, worst case I can open it and measure the voltages that the transformer
produces. It is not a lot of fun to open it (I had to, it had a loose screw
rattling inside or something like that) but it is doable.

If I remember correctly it produces 18V (AC? not sure) for the oven heater,
the rest of the MFS runs on 22.5V DC. There might also be 5V DC involved for
the MGPS (GPSDO module).

MfG,

Wilko

Quoting jung.schorndorf--- via time-nuts, who wrote on Thu, Jun 09, 2022 at 04:26:08PM +0200 .. hello Helmut, > 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 have been looking for the same information in every corner of the Internet but never found any schematics unfortunately.. But I happen to have the same PSU, a bit older even, as it is labeled Efratom. A working one fortunately! So, worst case I can open it and measure the voltages that the transformer produces. It is not a lot of fun to open it (I had to, it had a loose screw rattling inside or something like that) but it is doable. If I remember correctly it produces 18V (AC? not sure) for the oven heater, the rest of the MFS runs on 22.5V DC. There might also be 5V DC involved for the MGPS (GPSDO module). MfG, Wilko

GL

Glenn Little WB4UIV

Fri, Jun 10, 2022 1:09 AM

Here is what I have.
There is enough information to determine transformer requirements.

Glenn

On 6/9/2022 10:26 AM, jung.schorndorf--- via time-nuts 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

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

--

Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@arrl.net AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

Here is what I have. There is enough information to determine transformer requirements. Glenn On 6/9/2022 10:26 AM, jung.schorndorf--- via time-nuts 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 > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@arrl.net AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license"

time-nuts@lists.febo.com

Need help to DATUM Power Supply MPS (Type MFS Modular Frequency Systems)

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