[time-nuts] Lucent REF0-REF1 GPSDO status?
Hi list, I've been lurking around for several years off and on, followed some of the much discussed LUCENT/SYMMETRICOM Z3810AS, KS24361 L101/L102, HP-KIO OEM GPSDO. As you know they have been on fleabay for more than half a year are now, currently down to USD125 plus SH. Not bad for new out of the box units, even if they are two decades old. It gives some want-one-itch I followed the first hundred or so posts here on the list on these units but got lost on the overall status. So I have some questions, apologize in advance if these questions have already been covered: 1 Is there a simple fix to get REF1 work standalone? 2 There where 50nS or so trim glitches/jumps reported initially, did they disappear after some operating time? 3 Did someone find a reasonably straight-forward way to get 10MHz out of REF1? For me, replies with three Yes's/No's are enough, although more info is appreciated. Thanks ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Solatrtron 7151 DMM
Hi guys, it turns out I achieve the best results with an E1938A driven by a Fury board, compared to my PRS-10 Rb. I have not tried a Fury GPSDO with a standard DOCXO yet, but suspect similar results - that test to follow next week. The standard deviation over 15 hours is about 2.3ns, the range less than +/-8ns. Please see the attached plot. The E1938A has only been turned on less than 2 days after a very long power-off period (4+ months), but it is already very stable. Next step is to see which of the two is better, after that how much STS improvement can be gained by removing the GPS disciplining. bye, Said In a message dated 11/25/2009 17:20:40 Pacific Standard Time, rich...@karlquist.com writes: We demonstrated thermal gains of over 1 million in the E1938A single oven oscillator. You don't need a double oven. Rick Karlquist N6RK -- next part -- A non-text attachment was scrubbed... Name: E1938A_PRS10.gif Type: image/gif Size: 22684 bytes Desc: not available URL: http://www.febo.com/pipermail/time-nuts/attachments/20091128/118c72fa/attachment.gif -- ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts End of time-nuts Digest, Vol 64, Issue 95 * -- Jan Fredriksson http://www.41hz.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] time-nuts Digest, Vol 64, Issue 96
The smell does depart over time - you should have use more isopropyl alcohol and been more patient :-) A pity to loose one of those they are pretty rare. I actually gave it to a friend who's nose is less touchy. So it's in good use. And I have limited space and too much stuff. You can often find these at Ebay UK for around $20-30 The Solartron equipment I had has been very stable. I had a datalogger sent for calibration, ten years after the initial calibration and it had deviated by no more than 1 unit on the last digit, in several ranges, zero change. Jan -- Jan Fredriksson http://www.41hz.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Solartron
A pity to loose one of those they are pretty rare. I actually gave it to a friend who's nose is less touchy. So it's in good use. And I have limited space and too much stuff. You can often find these at Ebay UK for around $20-30 The Solartron equipment I had has been very stable. I had a datalogger sent for calibration, ten years after the initial calibration and it had deviated by no more than 1 unit on the last digit, in several ranges, zero change. Jan -- Jan Fredriksson http://www.41hz.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NI GPIB cards
There are also some USB versions of the NI GPIB. These are driver compatible with the NI drivers for the other cards, you do not need any extra drivers or software changes. The USB-GPIB from NI are available in at least three versions so far. On Ebay, they seem to be selling at between $250 and $400. The first vesion was USB(1) and had moderate data transfer rates while the latest are USB2 and GPIB high speed. One advantage with all, is that you do not need the bulky GPIB cable, only a USB cable between the PC and the first instrument. The actual electronics are hidden in the GPIB connector and the whole thing powers from the USB bus. A drawback with USB is that trigging/synking multiple hardware by GPIB via USB is probably less accurate than GPIB via the ISA or PCI bus. There are less common GPIB, like for the PXI and VIX busses, GPIB=RS232, GPIB=Ethernet. Lately thee are also GPIB fo PCI-Express. I have used many NI GPIG models over the last 15 years and never had any problems except that the PCI version could in some cases do an instant reboot of our Win2000 and XP boxes, if the GPIB software was badly configured. Jan F ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] The Original Time Nut
Hi, Can anyone point to some good reading on John Harrison, who in the 18th century devoted his life to making the best timekeepers ever built and who also constructed and built the first usable marine chronometer. Jan F ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] FE-5680A Rubidium Pinout again
Sorry the FE-5680A 1PPS is of course on pin 6, not pin 3. Still, about 1uS long only. Pin status 3 did not change on mine. Low all the time. Jan F ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] FE-5680A Rubidium Pinout again
Hi, The 1PPS output signal on pin 3 is very short, about one microsecond long. On my unit around 800nS only. -- Message: 3 Date: Mon, 18 Feb 2008 18:37:42 +0800 From: bbobb mokai [EMAIL PROTECTED] Subject: [time-nuts] FE-5680A Rubidium Pinout again To: time-nuts@febo.com Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1 hi nnovotney ,i got the fe 5680a too.the pinout of this unit is what i really want.my 5680a without the coax output too .when i used the 15v to pin 1.but there is no anythings output on the pin3. i am waitting for your reply.thanks all the same followwing i show my rubidiums.just check the url for view -- -- Jan Fredriksson http://www.41hz.com Support site for our customers: http://www.support.41hz.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] FE-5680A Rubidium Pinout again
Hi time-nuts, It's an amazing list you have here! I had no idea! A new world to me. I am new here and this is my first posting. I recently got one of the Ebay FE-5680A units, originating from a Motorola telecom board, without a coax out. I do not even have the Motorola board so there is little to start with. I fund some postings on the FE unit, most from 2005, here on in the time-nuts list. Did any of you make any progress with this unit and the pinout and communicating with it? I'd prefer not to fry the thing right from the start. I have opened the lid and found that my unit has a RS232 chip, Sipex SP233ACT. There is also a small internal 5 pin connector on the PCB, connected to the RS323 chip Rx/Tx and +5V. I can trace the front panel 9-pin connector pin 1 / power in to the onboard VR and pin 2 is ground. The unit has and a AD9830A DDS for frequency synthesis. In the product sheet for the FE-5680A it's mentioned that the unit can be factory programmed to wanted frequency. A good guess is that it's via this PCB port as RS232 is not available on the front panel connector as far as I can find. There are also two pushbuttons on one PCB. I have seen mentioned in the datasheet that it's for trimming the frequency. Well, any input would be highly appreciated. I have searched the net for all docs I could find but nothing very useful so far. I will be happy to share my findings if someone is interested. Neo-Timer Jan ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
