Thanks Glen, I had tried to send it off to a repair house, but they weren't able to repair it so I am looking for options. The label is pretty clear and I have looked at other power supplies with the same specs but they have different pinouts and it is extra trouble to repin the motherboard power connector to the new PS. The other issue is trying to match up passive cooling with the 125 watt output rating. Obviously, Symmetricom chose a PS that met their needs, just wish it was a bit more common. The S200 and S250 use a different PS with different voltages and lower wattage rating. Thanks for your help. Todd Smith

Hi Todd in case you have a defect power supply  plus the original specification  --   input voltage, output  voltages and currents -- I could help you by restoring it. Alex alex@pscons.com On 1/14/2023 2:03 PM, Glen Hoag via time-nuts wrote: > > Sent from my iPhone > >> On Jan 14, 2023, at 15:33, Todd Smith via time-nuts <time-nuts@lists.febo.com> wrote: >> >> I am looking for replacement power supplies for a S300. They use a Powdec >> HDT125-43 power supply that is hard to find. Powdec is out of business and >> this power supply is a triple output unit +5v, +15v, -15v. >> >> Anyone have a dead or decommissioned unit or spare power supplies that they >> would be willing to part with for a nominal sum? >> >> Thanks for a great list! I learn something new most days. >> >> Todd Smith > I’m not aware of any replacements, but oftentimes replacing all the electrolytic capacitors with modern 105C units will bring a SMPS back to life. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com >

On Sat, 14 Jan 2023 16:03:44 -0600, you wrote: >I’m not aware of any replacements, but oftentimes replacing all the electrolytic capacitors with modern 105C units will bring a SMPS back to life. >_______________________________________________ An ESR meter is your friend! -- Gary Woods O- K2AHC

I posted some pix of the insides of an Orolia (/Spectrocom) GSG-series GNSS simulator last week -- it uses an off-the-shelf power supply, with L+N on a connector, GND on a ring-terminal wire, and then the various regulated outputs on another connector. The internal power supply is mounted on ~10mm standoffs above the PCB. I noticed last night that there are several (maybe a total of three?) different hole patterns in the PCB beneath the power supply (that is using one of them). So, it looks like they had the foresight to design for a couple of different power supplies, and just had to do some trivial cabling between the instrument and the power supply to make it all work. --Andrew On Sat, Jan 14, 2023 at 4:35 PM Todd Smith via time-nuts < time-nuts@lists.febo.com> wrote: > Thanks Glen, > > I had tried to send it off to a repair house, but they weren't able to > repair it so I am looking for options. The label is pretty clear and I > have looked at other power supplies with the same specs but they have > different pinouts and it is extra trouble to repin the motherboard power > connector to the new PS. The other issue is trying to match up passive > cooling with the 125 watt output rating. > > Obviously, Symmetricom chose a PS that met their needs, just wish it was a > bit more common. The S200 and S250 use a different PS with different > voltages and lower wattage rating. > > Thanks for your help. > Todd Smith > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com >

Thanks Andrew, It looks like that case is standard among the earlier Symmetricom Syncservers but that the power supply varied to the motherboard and options like Rb or OCXO oscillator. There doesn't seem to be multiple mounting options and +/-15V is a little bit unusual. It is a PowDec HDT125-43-C-RA Input: 100-240VAC, 50-60Hz, 2A Output: +5V, 10A +15V, 4A -15V, 1A 125 watts max Todd Thanks On Sun, Jan 15, 2023 at 3:26 PM Andrew Kalman <aekalman@gmail.com> wrote: > I posted some pix of the insides of an Orolia (/Spectrocom) GSG-series > GNSS simulator last week -- it uses an off-the-shelf power supply, with L+N > on a connector, GND on a ring-terminal wire, and then the various regulated > outputs on another connector. > > The internal power supply is mounted on ~10mm standoffs above the PCB. I > noticed last night that there are several (maybe a total of three?) > different hole patterns in the PCB beneath the power supply (that is using > one of them). So, it looks like they had the foresight to design for a > couple of different power supplies, and just had to do some trivial > cabling between the instrument and the power supply to make it all work. > > --Andrew > > > > On Sat, Jan 14, 2023 at 4:35 PM Todd Smith via time-nuts < > time-nuts@lists.febo.com> wrote: > >> Thanks Glen, >> >> I had tried to send it off to a repair house, but they weren't able to >> repair it so I am looking for options. The label is pretty clear and I >> have looked at other power supplies with the same specs but they have >> different pinouts and it is extra trouble to repin the motherboard power >> connector to the new PS. The other issue is trying to match up passive >> cooling with the 125 watt output rating. >> >> Obviously, Symmetricom chose a PS that met their needs, just wish it was a >> bit more common. The S200 and S250 use a different PS with different >> voltages and lower wattage rating. >> >> Thanks for your help. >> Todd Smith >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe send an email to time-nuts-leave@lists.febo.com >> >

FWIW, the PSU inside the GSG-5/6 units I have is an ASTEC 45W unit, open-frame, that supplies 5V/5A, 15V/2.5A & -15V/0.7A. Spectracom/Pendulum/Orolia put a nice "cage" around it when they install it into these units. It's the same as this one on eBay right now: https://www.ebay.com/itm/234706193170 --Andrew -------------------------------- Andrew E. Kalman, Ph.D. On Sun, Jan 15, 2023 at 12:25 PM Andrew Kalman <aekalman@gmail.com> wrote: > I posted some pix of the insides of an Orolia (/Spectrocom) GSG-series > GNSS simulator last week -- it uses an off-the-shelf power supply, with L+N > on a connector, GND on a ring-terminal wire, and then the various regulated > outputs on another connector. > > The internal power supply is mounted on ~10mm standoffs above the PCB. I > noticed last night that there are several (maybe a total of three?) > different hole patterns in the PCB beneath the power supply (that is using > one of them). So, it looks like they had the foresight to design for a > couple of different power supplies, and just had to do some trivial > cabling between the instrument and the power supply to make it all work. > > --Andrew > > > > On Sat, Jan 14, 2023 at 4:35 PM Todd Smith via time-nuts < > time-nuts@lists.febo.com> wrote: > >> Thanks Glen, >> >> I had tried to send it off to a repair house, but they weren't able to >> repair it so I am looking for options. The label is pretty clear and I >> have looked at other power supplies with the same specs but they have >> different pinouts and it is extra trouble to repin the motherboard power >> connector to the new PS. The other issue is trying to match up passive >> cooling with the 125 watt output rating. >> >> Obviously, Symmetricom chose a PS that met their needs, just wish it was a >> bit more common. The S200 and S250 use a different PS with different >> voltages and lower wattage rating. >> >> Thanks for your help. >> Todd Smith >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe send an email to time-nuts-leave@lists.febo.com >> >