Re: [time-nuts] LMU300 Connectors
w1...@outlook.com said: > I would have expected a sticker somewhere, but nothing found. I'll hit it > with 28vdc and see if any "Magic Smoke" issues forth. The kind of DC-DC converter I'm talking about is often called a brick. That's a standard size, roughly 2x2x1/2 inches. The older ones were a block of epoxy. Similar units were available in half brick and quarter brick sizes. If you can see inside or get the cover off, you may find one. If so, it may have enough info printed on the package to answer your question and/or a manufacturer and part number so you can look it up on the web. There is a picture of the power board from a Z380A about 1/3 of the way down this page: http://www.realhamradio.com/GPS_Frequency_Standard.htm The 2 big rectangles are DC-DC converters. The one on the left doesn't have any useful info, but the Datel module has a part number that you could probably look up. (The Z3801A does have a sticker on the back. It's visible in the picture above the power board, but the resolution isn't good enough unless you know what you are looking for.) -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] LMU300 Connectors
The standard config for telecom equipment that runs on +24V or -48V is that they have an isolated input DC-DC converter in them. The input voltage goes through a full bridge rectifier that makes them insensitive to input voltage polarity. On the ones that I have played with they worked fine at 24V to.. 48V... YMMV... ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] LMU300 Connectors
The power supply is auto sensing and spec'd at +24V or -48V, which implies the polarity would be the same in either case, but the auto sensing doesn't seem to imply sensing right across that range. 24 V range is 22 to 28 V at 6A, -48V range is -40.5 to -57V at 3A, I don't recall checking what might happen at say 35 V, for example, I'd probably called it quits long before getting into that sort of detail:-) Anyone looking to play with these might want to check the archives for the post from Paul (K9MR) on 6th May 2017. Nigel, GM8PZR The outside of the box specs current need at 24vdc and 48vdc. Does the Power Supply recognize the voltage level or do I need to dig into it further ? Thanks, Dick, W1KSZ ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] LMU300 Connectors
Don't worry, the sticker says : 24V 6A or 48V 3A. It means it's a switched mode power supply. -Original Message- From: time-nuts On Behalf Of Richard Solomon Sent: Friday, 15 March 2019 17:11 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] LMU300 Connectors I would have expected a sticker somewhere, but nothing found. I'll hit it with 28vdc and see if any "Magic Smoke" issues forth. 73, Dick, W1KSZ Sent from Outlook<http://aka.ms/weboutlook> From: time-nuts on behalf of Hal Murray Sent: Thursday, March 14, 2019 10:12 PM To: Discussion of precise time and frequency measurement Cc: hmur...@megapathdsl.net Subject: Re: [time-nuts] LMU300 Connectors > The outside of the box specs current need at 24vdc and 48vdc. Does the > Power Supply recognize the voltage level or do I need to dig into it further ? There is a large collection of DC-DC converters available. A 2:1 range on the input voltage is common, but they usually are centered on 24V or 48V rather than spanning 24-48V. I'd expect a sticker next to the power input connector telling you which voltage it expects. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] LMU300 Connectors
I would have expected a sticker somewhere, but nothing found. I'll hit it with 28vdc and see if any "Magic Smoke" issues forth. 73, Dick, W1KSZ Sent from Outlook<http://aka.ms/weboutlook> From: time-nuts on behalf of Hal Murray Sent: Thursday, March 14, 2019 10:12 PM To: Discussion of precise time and frequency measurement Cc: hmur...@megapathdsl.net Subject: Re: [time-nuts] LMU300 Connectors > The outside of the box specs current need at 24vdc and 48vdc. Does the Power > Supply recognize the voltage level or do I need to dig into it further ? There is a large collection of DC-DC converters available. A 2:1 range on the input voltage is common, but they usually are centered on 24V or 48V rather than spanning 24-48V. I'd expect a sticker next to the power input connector telling you which voltage it expects. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] LMU300 Connectors
> The outside of the box specs current need at 24vdc and 48vdc. Does the Power > Supply recognize the voltage level or do I need to dig into it further ? There is a large collection of DC-DC converters available. A 2:1 range on the input voltage is common, but they usually are centered on 24V or 48V rather than spanning 24-48V. I'd expect a sticker next to the power input connector telling you which voltage it expects. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] LMU300 Connectors
The outside of the box specs current need at 24vdc and 48vdc. Does the Power Supply recognize the voltage level or do I need to dig into it further ? Thanks, Dick, W1KSZ Sent from Outlook<http://aka.ms/weboutlook> From: time-nuts on behalf of gandalfg8--- via time-nuts Sent: Thursday, March 14, 2019 2:25 PM To: time-nuts@lists.febo.com Cc: gandal...@aol.com Subject: [time-nuts] LMU300 Connectors Ah, thanks for the update, sounds like I need to take a closer look:-) Nigel, GM8PZR Thank you for your kind explanation.I was just intrigued by those connectors that I didn't know. It's also possible to rescue 6 VCOs from micro circuits and perhaps others components hidden behind their shield. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] LMU300 Connectors
Ah, thanks for the update, sounds like I need to take a closer look:-) Nigel, GM8PZR Thank you for your kind explanation.I was just intrigued by those connectors that I didn't know. It's also possible to rescue 6 VCOs from micro circuits and perhaps others components hidden behind their shield. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] LMU300 Connectors
Thank you for your kind explanation. I was just intrigued by those connectors that I didn't know. It's also possible to rescue 6 VCOs from micro circuits and perhaps others components hidden behind their shield. -Original Message- From: time-nuts On Behalf Of gandalfg8--- via time-nuts Sent: Thursday, 14 March 2019 17:18 To: time-nuts@lists.febo.com Cc: gandal...@aol.com Subject: [time-nuts] LMU300 Connectors They're QMA connectors, a Google search will find them, but not sure if that will help very much. Your mileage may vary but I quickly decided that whilst buying the complete unit was an excellent way to purchase the GPSDO in new condition, at the price they were selling for then anyway, there was very little I could do with the complete unit. Aside from the GPSDO the only really useful parts seem to be the fans, some of the leads, and perhaps the PSU module and/or the case:-) Nigel, GM8PZR Hi Everyone, Could someone help me identify connectors used on LMU300 from TruePosition? A picture can be found on http://www.on4jln.be/connector.jpg Thanks for your help. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] LMU300 Connectors
They're QMA connectors, a Google search will find them, but not sure if that will help very much. Your mileage may vary but I quickly decided that whilst buying the complete unit was an excellent way to purchase the GPSDO in new condition, at the price they were selling for then anyway, there was very little I could do with the complete unit. Aside from the GPSDO the only really useful parts seem to be the fans, some of the leads, and perhaps the PSU module and/or the case:-) Nigel, GM8PZR Hi Everyone, Could someone help me identify connectors used on LMU300 from TruePosition? A picture can be found on http://www.on4jln.be/connector.jpg Thanks for your help. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] LMU300 connectors
Hi Everyone, Could someone help me identify connectors used on LMU300 from TruePosition? A picture can be found on http://www.on4jln.be/connector.jpg Thanks for your help. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
