Re: [time-nuts] From Burt - K6OQK...
Hello Burt, Yes - we also wish good health and much contentment in the New Year to you as well and to our fellow time-nuts! 73's and 88's as they apply!, John Audrey AJ6BC On Mon, Dec 30, 2013 at 10:28 PM, Burt I. Weiner b...@att.net wrote: Gang, Best wishes to all for good health and much contentment in the New Year. Burt Margaret Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ 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 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] From Burt - K6OQK...
Okay, as long as we're talking New Year's, What's the time-nuttiest way to mark the occasion? I have this stuck in my head:http://www.youtube.com/watch?v=aWM5bmzYRh0#t=1m40s -Nate B- John C. Westmoreland, P.E. wrote: Hello Burt, Yes - we also wish good health and much contentment in the New Year to you as well and to our fellow time-nuts! 73's and 88's as they apply!, John Audrey AJ6BC On Mon, Dec 30, 2013 at 10:28 PM, Burt I. Weiner b...@att.net wrote: Gang, Best wishes to all for good health and much contentment in the New Year. Burt Margaret Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net http://www.biwa.cc K6OQK ___ 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] Sysclock source for AD9912
Anders You can set the overall PLL divider to any even value between 4 and 66 as there is a fixed /2 prescaler preceding the programmable divider, so with a 20MHz reference (from a 10MHz source) set the overall divider to 50 to give 1GHz - not sure if you set N to 50 or 25 in the Eval. software, but it's easy to do. regards Grant Anders wrote :- Thanks for all replies so far! It looks like I will play around with the evaluation board some more, and see if I can get the on-chip PLL to behave better. The settings with 2x edge-detector and 60x PLL were the only ones I could find where the output frequency setting in the software corresponded to the actual output frequency - hence I tested only with 10MHz x120 = 1200 MHz sysclock. I have asked about this on the AD forum, but no replies yet. If that doesn't work the suggested ADF4351 (or similar) evaluation board looks like the most straightforward option. thanks, Anders ___ 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] REQ: Manuals and Schematics for the Austron 2010B
Hi John, This is an old analogue design, but have used and sold them in the past. A bit of a bugger to set up, but they work well. Good luck! Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of John C. Westmoreland, P.E. Sent: 31 December 2013 00:14 To: Discussion of precise time and frequency measurement Subject: [time-nuts] REQ: Manuals and Schematics for the Austron 2010B Hello time-nuts, Another request - does someone in the group have the manuals and schematics for the Austron 2010B - disciplined frequency standard? Thanks and Happy New Year! John Westmoreland ___ 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 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] sysclock source for AD9912 DDS?
Some more testing today. It turns out that AD's schematic for the evaluation board doesn't match with reality - and so I had not connected the PLL filter components at all previously! Now they are 'in the loop' and I get reasonable results without the 2x reference clock setting. With 2x activated there are still very strong spurs. I have updated my blog with pictures from today: http://www.anderswallin.net/2013/12/ad9912-dds-test/ Could the remaining -60 dBc spurs at +/- 50 kHz be due to my 10MHz clock source, an Agilent 33120A? Next I will try cooking up some Arduino code for controlling the DDS over 3-wire bit-banged SPI (hardware SPI port is already in use on my arduino). Anders On Mon, Dec 30, 2013 at 5:56 PM, Anders Wallin anders.e.e.wal...@gmail.comwrote: I've tested the AD9912 evaluation board: http://www.anderswallin.net/wp-content/uploads/2013/12/dds_test_2013-12-30.png I want to use it with a 10MHz external input clock, but it looks like the on-board PLL that generates a 1200MHz sample clock from my input isn't that great, since I get strong side-bands on the output that are only 18-20 dB down from the fundamental. So it looks like I need to supply a clean 800-1000MHz clock to the DDS to get a clean output. Any ideas/suggestions for generating this from a 10 MHz sine? Driving the DDS system clock from an expensive RF generator (e.g. HP 8648A) would be possible but I'd prefer a PLL from 10MHz if it's doable simply/cheaply. Anders ___ 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] Efratom SLCR-101 rubidium - what have I just bought?
On 26/12/13 21:01, Charles Steinmetz wrote: Several observations: The listing is titled and the item is described in the listing text as an EFRATOM LPRO-101 10Mhz Oscillator, but the item in the photos is an SLCR-101. The frequency standard arrived today. It is indeed an SLCR-101. Lamp voltage measured at 8.14V on my Agilent DMM; if I cared enough I could connect it to one of the recently-calibrated Solartrons but that's a good enough ballpark figure for me Lock is achieved (BITE goes low) after a few minutes, less if the Rb is already warm. My TCXO-referenced Racal 1991 reports a frequency of 9.9921 MHz after both have warmed up for a few minutes. With BITE high (no lock), the frequency varies up and down by almost 100Hz each way, then snaps back to the above figure when the Rb locks. I might hook it up to the spectrum analyser later and see how clean the output is, but on the scope it looks pretty clean. While the seller appears to be in the UK, the used stickers are the same (including handwriting) as those applied by an infamous Chinese supplier, who sells from a number of China-based ebay accounts. So the ultimate origin of the item on the surplus market is apparently that Chinese seller. Infamous Chinese supplier - who? My suspicion is that this unit was bought, used for a brief while (perhaps to calibrate a few instruments) and then left on a shelf. Thanks, -- Phil. li...@philpem.me.uk http://www.philpem.me.uk/ ___ 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] sysclock source for AD9912 DDS?
On 12/31/13 8:07 AM, Anders Wallin wrote: Could the remaining -60 dBc spurs at +/- 50 kHz be due to my 10MHz clock source, an Agilent 33120A? Yes the spurs could be from your source. that's a function generator/ARB and spectral purity isn't one of the big design criteria for that kind of device. The spec sheet says spurious non-harmonic signals are supposed to be down -65dBc + 6dB/octave above 1 MHz. http://cp.literature.agilent.com/litweb/pdf/5968-0125EN.pdf I don't know all the gory details of how the 33120 works inside (though I've got 3 or 4 of them in my lab at work), but in general, it has a DDS running at 40MHz that clocks samples out of a waveform table to a 12 bit DAC. The output from the DAC is run through some analog circuitry for doing AM and setting offsets and levels. http://cp.literature.agilent.com/litweb/pdf/33120-90017.pdf 50 kHz is somewhat suspicious.. do you have any switching power supplies at that rate around? It doesn't take much noise added to a sine wave running into a comparator to create spurs. I've had that problem with leakage of a 66MHz processor clock into a 50 MHz sampling clock. ___ 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] Efratom SLCR-101 rubidium - what have I just bought?
Just for reference, my LPRO-101 is dirty as dickens. I get solid harmonics out to 150MHz. I haven't looked at it on a scope yet. There's a good filter on line, I think it was made for the LPRO, if you want the link, I'll look it up. Dave - Original Message - From: Philip Pemberton To: Discussion of precise time and frequency measurement Sent: Tuesday, December 31, 2013 12:04 PM Subject: Re: [time-nuts] Efratom SLCR-101 rubidium - what have I just bought? On 26/12/13 21:01, Charles Steinmetz wrote: Several observations: The listing is titled and the item is described in the listing text as an EFRATOM LPRO-101 10Mhz Oscillator, but the item in the photos is an SLCR-101. The frequency standard arrived today. It is indeed an SLCR-101. Lamp voltage measured at 8.14V on my Agilent DMM; if I cared enough I could connect it to one of the recently-calibrated Solartrons but that's a good enough ballpark figure for me Lock is achieved (BITE goes low) after a few minutes, less if the Rb is already warm. My TCXO-referenced Racal 1991 reports a frequency of 9.9921 MHz after both have warmed up for a few minutes. With BITE high (no lock), the frequency varies up and down by almost 100Hz each way, then snaps back to the above figure when the Rb locks. I might hook it up to the spectrum analyser later and see how clean the output is, but on the scope it looks pretty clean. While the seller appears to be in the UK, the used stickers are the same (including handwriting) as those applied by an infamous Chinese supplier, who sells from a number of China-based ebay accounts. So the ultimate origin of the item on the surplus market is apparently that Chinese seller. Infamous Chinese supplier - who? My suspicion is that this unit was bought, used for a brief while (perhaps to calibrate a few instruments) and then left on a shelf. Thanks, -- Phil. li...@philpem.me.uk http://www.philpem.me.uk/ ___ 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1432 / Virus Database: 3658/6461 - Release Date: 12/30/13 ___ 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] HP 5065A serial number list
As promised here is a list of all the HP 5065A units I have come across. I believe there should be a 08xx prefix out there as the units first came out in the middle of 1968. I also think that the 2816A prefix is the last prefix used. Anyone have any others I can add to the list? Another tidbit, the latest optical unit warrenty date I have seen is 1993. Known HP5065A serial numbers 0916-00181 2816A01556 0928-2816A01554 0940-00203 2816A01565 0960A00285 2816A01566 0960A00312 2816A01567 0960A00313 2816A01591 0968A00312 2816A01596 1104A00376 2816A01617 1220A00422 2816A01618 1220A00426 2816A01636 1220A00444 2816A01640 1220A00448 2816A01645 1220A00463 2816A01652 1320A00492 2816A01658 1340A00519 2816A01666 1340A00521 2816A01674 1340A00528 2816A01677 1416A 2816A01688 1420A00613 2816A01693 1420A00651 2816A01697 1532A00725 1736A 1908A00853 1908A00910 2112A01035 2144A01088 2216A01121 2232A01149 2320A01200 2340A01200 2340A01235 2340A01290 2432A01332 2432A01338 2432A01380 2432A01400 2432A01430 2614A01514 2632A01463 2644A01471 2740A01547 ___ 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] HP 5065A serial number list
1420A00658 ___ 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] Efratom SLCR-101 rubidium - what have I just bought?
Phil wrote: While the seller appears to be in the UK, the used stickers are the same (including handwriting) as those applied by an infamous Chinese supplier, who sells from a number of China-based ebay accounts. So the ultimate origin of the item on the surplus market is apparently that Chinese seller. Infamous Chinese supplier - who? Look at the ebay ads for timing-related stuff (rubidiums and OCXOs in particular) and you will find a half-dozen or so Chinese ebay sellers who specialize in surplus telcom equipment and whose items have identical handwritten Used stickers to the ones on the unit in the listing photos (presumably, the one you have now). I believe these various ebay user IDs all belong to the same entity. Others think it may be different sellers that all buy from the same wholesale supplier, but having done business with a few of them I'm pretty sure the ebay IDs all belong to one guy (based on return address and packaging). My suspicion is that this unit was bought, used for a brief while (perhaps to calibrate a few instruments) and then left on a shelf. It was almost certainly originally bought by a large telcom operator and installed at a cell phone transmitter site, where it spent 10-15 years. When it was decommissioned, it was sold to a surplus dealer and ended up on ebay. Your seller bought it on ebay from the Chinese dealer, used it for a while (or not), and has now sold it to you. Best regards, Charles ___ 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] REQ: Manuals and Schematics for the Austron 2010B
Hi John, I have original Austron manuals, including 2010 and 2110. And working units, spare parts, etc. Contact me off-list. /tvb www.LeapSecond.com - Original Message - From: John C. Westmoreland, P.E. j...@westmorelandengineering.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Monday, December 30, 2013 4:14 PM Subject: [time-nuts] REQ: Manuals and Schematics for the Austron 2010B Hello time-nuts, Another request - does someone in the group have the manuals and schematics for the Austron 2010B - disciplined frequency standard? Thanks and Happy New Year! John Westmoreland ___ 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] From Burt - K6OQK...
Okay, as long as we're talking New Year's, What's the time-nuttiest way to mark the occasion? No leap second this year. Boring. /tvb ___ 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] HP 5065A serial number list
Hi Corby, Thanks much for your effort to accumulate all this history, as well as improving on the original design. /tvb - Original Message - From: cdel...@juno.com To: time-nuts@febo.com Sent: Tuesday, December 31, 2013 10:57 AM Subject: [time-nuts] HP 5065A serial number list As promised here is a list of all the HP 5065A units I have come across. ... ___ 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] REQ: Manuals and Schematics for the Austron 2110
Hei Harald, On 30/12/13 09:12, Harald Hauglin wrote: Hello, I have a manual for the 2110 at work, including several fold-out schematics as I recall. I will have time to scan it in a couple of days. Christmas greetings from Norway! - Harald P.S. I have been a long time lurker on the time-nuts list, but I believe this is my first useful contribution :-) ... and a good post it is, offering help. It is always good if we can get things scanned and put on some suitable webpage, such as Didiers. Cheers, Magnus -Opprinnelig melding- Fra: John C. Westmoreland, P.E. [mailto:j...@westmorelandengineering.com] Sendt: 29. desember 2013 04:01 Til: Discussion of precise time and frequency measurement Emne: [time-nuts] REQ: Manuals and Schematics for the Austron 2110 Hello All, Does someone in the group have the manuals and schematics for the Austron 2110 - microprocessor controlled disciplined frequency standard? A lot of the Austron manuals are on the 'net - but I cannot find the one for the 2110 (yet). Thanks In Advance! John W. ___ 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 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 Best way to Mark the New Year...
We usually go to bed around 10 PM or so. We get up around 8 in the morning and hope it's all done. Then we watch the Rose Parade about 10 times. You never know, you may miss something the first 8 or 9 times through. :. Burt, K6OQK Okay, as long as we're talking New Year's, What's the time-nuttiest way to mark the occasion? No leap second this year. Boring. /tvb Pardon the spelling as this was sent from my Verizon Wireless 4G LTE Smartphone ___ 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] sysclock source for AD9912 DDS?
Hej Anders, On 31/12/13 08:31, Anders Wallin wrote: Thanks for all replies so far! It looks like I will play around with the evaluation board some more, and see if I can get the on-chip PLL to behave better. The settings with 2x edge-detector and 60x PLL were the only ones I could find where the output frequency setting in the software corresponded to the actual output frequency - hence I tested only with 10MHz x120 = 1200 MHz sysclock. I have asked about this on the AD forum, but no replies yet. If that doesn't work the suggested ADF4351 (or similar) evaluation board looks like the most straightforward option. Looking at the datasheet, it looks like you are pushing it a bit hard from the reference clock side of things. Using double-edge trigger is a good way to upset things, as rising and falling edge, as detected, may cause re-occuring stress in either direction, so it's not ideal. Sniffing the loop at pin 31 would give you a hint if it is pumping every 50 ns or so. I would consider of using a 100 MHz OCXO as an intermediate step. Lock it to your 10 MHz in a high-bandwidth PI loop and then feed it to the AD9912 board. What is your tool of choice for checking the phase-noise? Cheers, Magnus ___ 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] The Best way to Mark the New Year...
On 31-Dec-13 18:01, Burt Weiner wrote: We usually go to bed around 10 PM or so. We get up around 8 in the morning and hope it's all done. Then we watch the Rose Parade about 10 times. You never know, you may miss something the first 8 or 9 times through. :. Burt, K6OQK Okay, as long as we're talking New Year's, What's the time-nuttiest way to mark the occasion? No leap second this year. Boring. /tvb snippage For us, watching the rampant lunacy on New Year's At The Needle (referring to the Seattle landmark), and chuckling at how much latency there is between the local TV station's countdown and our clocks. Oh, and a small 'midnight picnic' with fruit, cheese, garlic bread and Martinelli's fizzy cider. Keep the peace(es). -- --- Bruce Lane, ARS KC7GR http://www.bluefeathertech.com kyrrin (at) bluefeathertech dot com Quando Omni Flunkus Moritati (Red Green) ___ 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] sysclock source for AD9912 DDS?
On 12/30/2013 9:37 AM, Gerhard Hoffmann wrote: Driving the DDS system clock from an expensive RF generator (e.g. HP 8648A) would be possible but I'd prefer a PLL from 10MHz if it's doable simply/cheaply. Although expensive from a hobbyist viewpoint, the HP8648A is far from HP/Agilent's best, and even the best (8662A) is still not adequate to use as a clock in most cases. No general purpose sig gen is. (disclaimer: I work for Agilent). Rick Karlquist N6RK ___ 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] sysclock source for AD9912 DDS?
Actually the Rohde SMA100A with opt B22 is pretty darn good, and Rick is being a bit humble, the Agilent E8663D is also very good. I hope all member have a happy and prosperous new year. Thomas Knox Date: Tue, 31 Dec 2013 20:01:38 -0800 From: rich...@karlquist.com To: g...@hoffmann-hochfrequenz.de; time-nuts@febo.com Subject: Re: [time-nuts] sysclock source for AD9912 DDS? On 12/30/2013 9:37 AM, Gerhard Hoffmann wrote: Driving the DDS system clock from an expensive RF generator (e.g. HP 8648A) would be possible but I'd prefer a PLL from 10MHz if it's doable simply/cheaply. Although expensive from a hobbyist viewpoint, the HP8648A is far from HP/Agilent's best, and even the best (8662A) is still not adequate to use as a clock in most cases. No general purpose sig gen is. (disclaimer: I work for Agilent). Rick Karlquist N6RK ___ 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 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.
