Re: [time-nuts] How to create a super Rb standard

2017-01-18 Thread Javier Herrero
Hello, And about temperature, in this article http://www.dtic.mil/dtic/tr/fulltext/u2/a495520.pdf there is an interesting point, in the last page: Riley answer to the question "You mentioned larger cells. Where there any other things done go get these fantastic results? Regards, Javier

Re: [time-nuts] hm H Maser

2017-01-10 Thread Javier Herrero
man/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] Tait reference

2016-01-11 Thread Javier Herrero
Hello, Tait T800 is a series of mobile radio repeaters, so probably the T801 could be a unit intended for iso-frequency networks, in which there are several repeaters are distributed in a wide area operating all at the same frequencies with a very tight tolerance. BNCs and 13.8V power

Re: [time-nuts] Why would Keysight UK uncertainty measuring 1 MHz be as high as 7.6 Hz?

2015-08-29 Thread Javier Herrero
Hello, The calibration certificate does not indicate that the measurements were done with the frequency counters referenced to the 5071A at the time of calbiration (if so, it would be listed under the Calibration Equipment Used table). It says that the 53132A were calibrated against the

Re: [time-nuts] looking for SMT oscillator SC cut, with no oven

2015-08-26 Thread Javier Herrero
Hello, Jim, I suppose that one of the alternatives that you've explored are the ABLNO from Abracon http://www.abracon.com/Precisiontiming/ABLNO.pdf They say that they are 3rd overtone, but it seems more an AT-cut than a SC, and anyway is around 10dB poorer than your requirements. An I

[time-nuts] Leap Second in press

2015-06-30 Thread Javier Herrero
Hello, This is an article published in one of the main newspapers in Spain, about the timekeeper at ROA, the institution responsible of legal time in Spain. http://www.elmundo.es/ciencia/2015/06/30/559189c622601d6b4e8b4594.html It is in spanish, but has pictures :) Regards, Javier

Re: [time-nuts] STEL-1173/CM Source

2014-12-18 Thread Javier Herrero
Hello! On 18/12/2014 5:37, Magnus Danielson wrote: Ed, On 11/15/2014 04:38 PM, Ed Palmer wrote: Yes, I'm sure. I did check the cabling. :) If I was somehow measuring the Tbolt or 4065A against itself, there wouldn't be any frequency offset. The Oscilloquartz 3210 (which appears to be an

Re: [time-nuts] What sort of oscillator is this?

2014-09-28 Thread Javier Herrero
On 28/09/2014 17:44, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: BTW, you may note Keysight's uncertainty for measurement of the 10 MHz reference in September 2014 is 0.0010 Hz, whereas Agilent's was 0.00080 Hz in August 2013. They 5071A primary frequency standard. I assume the fact that the

Re: [time-nuts] Oscilloquartz 3210 Cesium Standard

2014-08-29 Thread Javier Herrero
: On 08/28/14 19:53, Javier Herrero wrote: Hello, Then it is a quite different beast to the EUDICS 3120, that they also call OSA-3120... I note now that yours is a 3210, not 3120 :) Regards, Javier The 3210 looks like a much earlier design, prior to the inclusion of microprocessor control. Date

Re: [time-nuts] Oscilloquartz 3210 Cesium Standard

2014-08-28 Thread Javier Herrero
, Chris wrote: On 08/28/14 05:03, Javier Herrero wrote: Hello, Here is the manual I've. I have also some other documentations, and some Oscilloquartz software for the OSA-5585, but I don't know if they are very useful. Regards, Javier Hi Javier, Thanks for that and for the other replies

Re: [time-nuts] Oscilloquartz 3210 Cesium Standard

2014-08-27 Thread Javier Herrero
Hello, I've some manuals from an OSA-5585, one of them for the EUDICS 3120. The thing that Symmetricom calls EUDICS-3120 really is a FTS-5045 module (Symmetricom in my case), that I think that it is the same that is inside the FTS-4060. It seems that one common problem with these, discuted

Re: [time-nuts] Symmetricom 1111C OCXO question

2014-07-26 Thread Javier Herrero
Hello, Supply voltage is 24V. I've no information of the control voltage range and slope. Regards, Javier On 26/07/2014 7:02, davidh wrote: Hi All, Can anyone advise the supply voltage and range of the control voltage for these gadgets? Cheers, david

Re: [time-nuts] temperature sensor

2014-07-21 Thread Javier Herrero
Hello, There are two types of NTC thermistors that are (very) frequently used in spacecrafts, the Measurement Specialties (traditionally YSI, Yellow Spring Instruments) 44907 and 44908, that are 10k @ 25ºC NTC: http://meas-spec.com/downloads/44908.pdf and

Re: [time-nuts] Weather/units question for European members

2014-05-24 Thread Javier Herrero
Hello, Wind speed usually in meters/sec (when used for scientific data) or km/h (used in the news, so the people can compare with car speed ;) ) Pressure in millibars. Meteorologist also usually refers to hectopascals, but it is more for representing something at a given altitude (for

Re: [time-nuts] STEL 1175 vice 1173

2014-05-14 Thread Javier Herrero
Hello, I think that not as a direct replacement of the 1173. The 1175 has 32-bit phase increment resolution and 10-bit DAC output. The 1173 has 48/12 bit. Regards, Javier On 14/05/2014 17:13, cdel...@juno.com wrote: Hi, I found two PLCC STEL 1175 in a rack mounted synthesizer I have.

Re: [time-nuts] Very slow freq. counter / event counter

2014-04-20 Thread Javier Herrero
On 18.04.2014 19:17, Andrea Baldoni wrote: Hello. In the lab, I would like to have an event counter that can double as frequency/period counter, with maximum clock rate in the order of the tens of Hz or so, better with TIC function (aka chronometer). Resolution need not be better than 1/100s,

Re: [time-nuts] Acam TDC's

2014-04-07 Thread Javier Herrero
On 07.04.2014 18:51, Dan Kemppainen wrote: At which resolution do you wish to get 40Msps? Tell me the single-shot jitter figure. So far we had only several ksps of throughput in our TDC circuit, but the bottleneck lies within a computer interface. Anyway, it is not an easy task to get some

[time-nuts] Symmetricom 1111C OCXO question

2014-04-03 Thread Javier Herrero
Hello all, I've a C OCXO (inside a Symmetricom 5045A that is inside an Oscilloquartz OSA 5585) that refuses to start. It seems that one voltage regulator is not operating, with only 2V at its output while it should have (I think...) around 12V. I've partially analyzed the circuit, and it

Re: [time-nuts] Symmetricom 1111C OCXO question

2014-04-03 Thread Javier Herrero
, Javier Herrero jherr...@hvsistemas.es wrote: Hello all, I've a C OCXO (inside a Symmetricom 5045A that is inside an Oscilloquartz OSA 5585) that refuses to start. It seems that one voltage regulator is not operating, with only 2V at its output while it should have (I think...) around 12V

Re: [time-nuts] Symmetricom 1111C OCXO question

2014-04-03 Thread Javier Herrero
On 03.04.2014 18:25, Azelio Boriani wrote: Other idea than leaving the 6K8 resistor? Yes... I would prefer to know why the little thing has stopped working. The 6k8 resistor has also probed to be a marginal solution. The operational amplifier is a Burr-Brown one (don't have the p/n at hand

Re: [time-nuts] Trimble Thunderbolt 1pps

2014-01-27 Thread Javier Herrero
On 27.01.2014 15:08, Attila Kinali wrote: In practice, the receiver chip only has one power supply. It would take extra work to make the switching threshold below ground. That's not correct. Standard transceiver chips (like the MAX232 family) have an integrated charge pump to get a negative

Re: [time-nuts] Trimble Thunderbolt 1pps

2014-01-27 Thread Javier Herrero
On 27.01.2014 19:33, Robert Atkinson wrote: All the receiver chips I've looked at, ancient and modern, have only positive thresholds. Most have single supplies and clamp the input at 1 diode drop negative WRT common after an input current limiting resistor, see the MC1489 datasheet. Hello,

Re: [time-nuts] Generate 1 PPS signal on serial port

2013-08-06 Thread Javier Herrero
Hello, On 06.08.2013 17:25, Chris Albertson wrote: The current Linux kernel has a PPS GENERATOR. See pps_gen_parport Put WHY would you need this? The documentation for pps_gen_parport suggests only using it for crude synchronization of sevel computers but NTP would in every case work better

Re: [time-nuts] Have 10 MHz need 19.2 MHz

2013-06-07 Thread Javier Herrero
On 07.06.2013 19:23, Perry Sandeen wrote: List, Another hardware possibility. Double the 10 MHz to 20 MHz. With another circuit of 74HC390’s divide 10 MHz to 200 KHz. Then double it twice to 800 KHz with LM 1496 DBM’s. Apply the two frequencies to a LM 1496 DBM and use a LPF to get

Re: [time-nuts] have 10MHz need 19.5Mhz

2013-06-02 Thread Javier Herrero
-Wave-/400352450150?pt=LH_DefaultDomain_0hash=item5d36dd9666 Regards, Javier -- Javier Herrero Chief Technology Officer EMAIL: jherr...@hvsistemas.com HV Sistemas S.L. PHONE

Re: [time-nuts] (Datum) FTS-4040A cesium, and STEL-1173 NCO chip

2013-04-29 Thread Javier Herrero
Hello, These people seems to have them availabe at single quantities for $65... perhaps not in the right packaging: http://www.questcomp.com/questdetails.aspx?pn=STEL-1173%2FCLpnid=372732stock=Yes (I've never purchased from them... si I cannot encourage or discourage :) ) Regards, Javier

Re: [time-nuts] Releasing sources (was Re: Brooks Shera)

2013-03-31 Thread Javier Herrero
On 31.03.2013 17:32, Lizeth Norman wrote: All u guys that post code to push up your little ego and then don't help when it sucks need to see a shrink. Don't want emails, don't post. Keep your bad code in the folder were it belongs. Are you suppossing that anybody that releases any code must

Re: [time-nuts] How far can I push a crystal?

2013-01-18 Thread Javier Herrero
On 18.01.2013 22:41, shali...@gmail.com wrote: 10.059 used to be a standard frequency for some 8051 microcontrollers. Should not be too hard to find. No, it was 11.0592 Regards, Javier ___ time-nuts mailing list -- time-nuts@febo.com To

[time-nuts] OT question about liquid cooling

2012-10-03 Thread Javier Herrero
Hello all, Please excuse me for the OT, but since this list is plenty of very knowledgeable colleagues, I'm tempted to ask... I need to cool several resistive loads, in the order of 5kW, and I plan to use a cold plate and a liquid-to-liquid heat exchanger like the Lytron LCS-20, but this

Re: [time-nuts] RFX GPSDO - Anybody played with one of these?

2012-10-01 Thread Javier Herrero
El 01/10/2012 11:22, Hal Murray escribió: t...@westwood-tech.com said: information appeared to be non-existent. IMHO for pretty much *everything* that is for sale, if you have to ask for the price it is a scam. Yes, when it says call for pricing, I usually drop interest. But I wouldn't say

Re: [time-nuts] RFX GPSDO - Anybody played with one of these?

2012-10-01 Thread Javier Herrero
I asked for a quotation to one spanish distributor about a year ago. It was quoted at 977 EUR for a single unit, for the newer Thunderbolt E. $465 seems not bad for that unit. Regards, Javier El 01/10/2012 18:53, Chris Albertson escribió: On Mon, Oct 1, 2012 at 9:27 AM, Don Latham

Re: [time-nuts] messy workbenches

2012-09-30 Thread Javier Herrero
El 29/09/2012 19:11, Joe Leikhim escribió: I would have to agree that a lot of engineer and tech types fall into these categories. If not, we would probably not have and GPS satellites, cellphones and supersonic planes.(where is my hoverboard?) Not sure. Asperger is a type of autism, and

Re: [time-nuts] Re; New Wrist watch

2012-09-10 Thread Javier Herrero
and velocity. Well, but since the $150 wrist watch class usually does not provide a microsecond hand, I suspect that this would pass inadverted :) Regards, Javier -- Javier Herrero Chief Technology Officer

Re: [time-nuts] oscillators

2012-08-31 Thread Javier Herrero
El 30/08/2012 20:53, saidj...@aol.com escribió: There are some drawbacks to this type of SC-cut MCXO I would think, and it could possibly be replaced by a much higher performance Symmetricom CSAC, probably at a lower cost and higher availability: * Q-tech MCXO is ITAR controlled, CSAC is not

Re: [time-nuts] So, how did you spend your leapsecond?

2012-07-01 Thread Javier Herrero
After watching Blade Runner (the director cut) reposition on a TV channel, that ended just one minute before 2am local time, I watched my nixie clock to, as I was expecting, held 02:00:00 (local time) by two seconds. Surely its GPS (an M12T) sent the right time to the uC, 23:59:60 UTC... but

Re: [time-nuts] Clockwise.

2012-06-26 Thread Javier Herrero
See below, after /tvb ;) El 26/06/2012 15:08, Azelio Boriani escribió: Yes, and the reference? On Tue, Jun 26, 2012 at 2:32 PM, Tom Van Baak (lab) t...@leapsecond.comwrote: With four points one can compute ADEV... /tvb (iPhone4) ___ time-nuts

Re: [time-nuts] Clockwise.

2012-06-26 Thread Javier Herrero
It can be a reference. I was not meaning a good one :) And surely it is not that bad as a clock. El 26/06/2012 15:32, Azelio Boriani escribió: OK, in my opinion the iPhone is not a reference but, well, if you say it is then OK. On Tue, Jun 26, 2012 at 3:20 PM, Javier Herrero jherr

Re: [time-nuts] Thunderbolt won't set a stored position?

2012-06-12 Thread Javier Herrero
El 12/06/2012 08:50, Chris Wilson escribió: It has also always shown a Leap Second Pending minor alarm, but I believe this is quite usual? Hello, it is usual now since there is a leap second scheduled for next 30-Jun. After that day, it will disaappear... until next one :) Regards,

Re: [time-nuts] Dimension 4 and GPS time disagree, why?

2012-06-12 Thread Javier Herrero
El 12/06/2012 13:09, David J Taylor escribió: I run Dimension 4 as a time standard on my POC's, mainly for using JT65 digital radio communications. It polls tick.usno.navy.mil for the time. I have noticed since getting my ThunderBolt set up that the GPS time is about 15 seconds in advance of my

Re: [time-nuts] Different or defective FE-5680A?

2012-06-09 Thread Javier Herrero
El 09/06/2012 09:35, Chris Albertson escribió: On Fri, Jun 8, 2012 at 11:22 PM, Ed Palmer ed_pal...@sasktel.net wrote: ... It is programmable over a wide frequency range (typically 100 Hz to 15-20 MHz), but you have to bring out the signal yourself,... Any idea WHY someone would design

Re: [time-nuts] Thunderbolt GPS rollover

2012-06-07 Thread Javier Herrero
/mailman/listinfo/time-nuts and follow the instructions there. -- Javier Herrero Chief Technology Officer EMAIL: jherr...@hvsistemas.com HV Sistemas S.L. PHONE: +34 949 336 806

Re: [time-nuts] GPS and Rubidium frequency standards and noise question (new...

2012-06-03 Thread Javier Herrero
Hello, El 03/06/2012 10:46, saidj...@aol.com escribió: The FEI-5680A Rubidium that we discussed here some time ago has a much worse phase noise plot of course, because the 10MHz is generated digitally through a DDS, not a 10MHz crystal oscillator.. There is a version that generates 10MHz

Re: [time-nuts] GPS and Rubidium frequency standards and noise question (new...

2012-06-03 Thread Javier Herrero
there. -- Javier Herrero Chief Technology Officer EMAIL: jherr...@hvsistemas.com HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http

Re: [time-nuts] Oh dear

2012-05-07 Thread Javier Herrero
El 07/05/2012 11:20, Attila Kinali escribió: But to bring this back to time nutty topics, have a look at http://www.colorfly.eu/product.html It's an MP3 player with high precision timing. It does not only use two TCXOs with 5ps Jitter.. No! It also employes a technique known as Jitter Kill for

Re: [time-nuts] parking lot location (was2 (Spoofing))

2012-04-20 Thread Javier Herrero
No, there are a lot more messages from him since at least 2008 and last one in the chinese scopes thread some days ago. The e-mail origin seems quite authentic from the headers, so I suspect he has sent it to the list in error :) Rgds, Javier El 21/04/2012 00:50, Bill Hawkins escribió:

Re: [time-nuts] Holy cesium clock, Batman!

2012-04-09 Thread Javier Herrero
El 09/04/2012 16:59, Tom Knox escribió: I have heard the definition of a Time Lord is someone who has more then one clock and still knows what time it is. Thomas Knox No, no, is someone who know what time it is without needing a clock :) Regards, Javier

Re: [time-nuts] Holy cesium clock, Batman!

2012-04-08 Thread Javier Herrero
El 08/04/2012 04:31, Magnus Danielson escribió: Oups, there is currently 7 caesium clocks in my lab (not all mine) and I'm not there to protect them all. Lost count of rubidium... Hum. 7 Cs clocks and lost count of Rb... and you're not there to protect them all... give me the address, I

Re: [time-nuts] FPGA GPSDO (Was: Re: NTP jitter with Linux)

2012-04-07 Thread Javier Herrero
El 07/04/2012 18:17, shali...@gmail.com escribió: When you install the Altera tools, it automatically installs NIOS and gcc. I assume there are no restrictions for private use, but you may have to send $ if you make a commercial product. That remains to be checked. With the Quartus Web, you

Re: [time-nuts] FPGA GPSDO (Was: Re: NTP jitter with Linux)

2012-04-07 Thread Javier Herrero
El 07/04/2012 16:02, Jim Lux escribió: On 4/7/12 4:47 AM, Javier Herrero wrote: I'm very familiar with the LEON and RTEMS, having managed a software development project with it for the last 3 or 4 years at work. http://www.gaisler.com/ for LEON http://www.rtems.org/ for RTEMS I will have

Re: [time-nuts] FPGA GPSDO (Was: Re: NTP jitter with Linux)

2012-04-07 Thread Javier Herrero
El 08/04/2012 00:21, Jim Lux escribió: On 4/7/12 10:08 AM, Javier Herrero wrote: El 07/04/2012 16:02, Jim Lux escribió: RTEMS might be just what you need. Kernel, basic OS calls for scheduling, queues, etc. It's nice when you decide you want threading to not have to graft it into a big

Re: [time-nuts] FPGA GPSDO (Was: Re: NTP jitter with Linux)

2012-04-07 Thread Javier Herrero
for a 5000 EUR management fee... Best regards, Javier -- Javier Herrero Chief Technology Officer EMAIL: jherr...@hvsistemas.com HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones

Re: [time-nuts] NTP jitter with Linux

2012-04-05 Thread Javier Herrero
El 05/04/2012 12:20, Azelio Boriani escribió: On a side note, speaking of deterministic systems, why has no one built a GPSDO with an FPGA yet? Or an NTP server? :) Oh, I've done that (an NTP server, not GPSO) in a Cyclone III FPGA. But well... it has a Nios-II CPU and runs Linux, so I

Re: [time-nuts] NTP jitter with Linux

2012-04-04 Thread Javier Herrero
El 05/04/2012 00:58, gary escribió: That is the AMD speed step, but doesn't intel do the same thing? I suppose so. In any case, under Linux you can force off the speed step (i.e. force the CPU to a fixed clock). I did that some time ago in a Dell server with a dual quad-core Opteron with

Re: [time-nuts] Pulsar Source?

2012-03-30 Thread Javier Herrero
El 30/03/2012 05:02, Jim Lux escribió: and orientation. Sort of like a super star tracker all in one! (You can see why NASA is interested..) And ESA. Last year they published an invitation to tender called Deep Space Navigation with Pulsars, with the following description excerpt: The

Re: [time-nuts] Opera coordinator has resigned

2012-03-30 Thread Javier Herrero
El 30/03/2012 16:55, Javier Serrano escribió: On Fri, Mar 30, 2012 at 3:07 PM, iov...@inwind.itiov...@inwind.it wrote: http://inagist.com/all/185697069783195648/ Personally I'm sorry about such an end of the story. There was a meeting in Gran Sasso on Wednesday. You can see some of the

Re: [time-nuts] Opera coordinator has resigned

2012-03-30 Thread Javier Herrero
I suppose that when it was photographed, nobody noticed it. After noticed that it was no correctly plugged-in, the past pictures were reviewed and found that in fact it was not fully plugged in :) El 31/03/2012 01:04, iov...@inwind.it escribió: May anybody out there explain why the connector

Re: [time-nuts] Distribution amp - Use a video amp unit ?

2012-03-26 Thread Javier Herrero
, is something I haven't seen before, but technically 1N914BWT != 1n914. That is, in the strict sense, the 1n914 has to be a diode in that glass package. On 3/25/2012 5:48 PM, Javier Herrero wrote: El 26/03/2012 02:35, gary escribió: I forgot to mention that those old jedec part numbers specify

Re: [time-nuts] LEA-6T Group buy

2012-03-26 Thread Javier Herrero
El 26/03/2012 22:30, Azelio Boriani escribió: 120CHF + the custom duties. Even if in the EU. Switzerland is not part of EU :) Although it is part of Schengen Area. Regards, Javier ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe,

Re: [time-nuts] Distribution amp - Use a video amp unit ?

2012-03-25 Thread Javier Herrero
El 26/03/2012 02:35, gary escribió: I forgot to mention that those old jedec part numbers specify a package and electrical limit under one part number. That is, you can't find say a 1n914 in SMD, but you can find direct equivalents with other numbers. You will find supply houses listing SMD

Re: [time-nuts] Experience with THS788 from TI?

2012-03-21 Thread Javier Herrero
13ps resolution at 200Msps sampling rate and real 15.8Msps output data throughput? not too many around :) Regards, Javier El 21/03/2012 15:44, David escribió: I am surprised it is not more accurate and precise. Even old discrete designs can get down to 10ps or better. I wonder what

Re: [time-nuts] Neutrinos not faster than light

2012-03-16 Thread Javier Herrero
I think that this is the article: http://arxiv.org/pdf/1110.3763.pdf It is not strange that the results are available now. These experiments are run during months, and generates a large quantity of data. Best regards, Javier El 16/03/2012 21:19, Azelio Boriani escribió: OK, that is, are

Re: [time-nuts] Neutrinos not faster than light

2012-03-16 Thread Javier Herrero
The paper is this one, dated yesterday: http://arxiv.org/ftp/arxiv/papers/1203/1203.3433.pdf Regards, Javier El 16/03/2012 21:50, Javier Herrero escribió: I think that this is the article: http://arxiv.org/pdf/1110.3763.pdf It is not strange that the results are available now

Re: [time-nuts] Neutrinos not faster than light

2012-03-16 Thread Javier Herrero
/2012 21:50, Javier Herrero escribió: I think that this is the article: http://arxiv.org/pdf/1110.3763.pdf It is not strange that the results are available now. These experiments are run during months, and generates a large quantity of data. Best regards, Javier El 16/03/2012 21:19, Azelio

Re: [time-nuts] quartz crystal configuration in small cases

2012-03-13 Thread Javier Herrero
Hello, AT cut crystals can be manufactured both as a round disk or as a strip resonator, so probably they are AT. For example, these are: http://cfm.citizen.co.jp/english/product/pdf/HC-49_U-S.pdf and http://cfm.citizen.co.jp/english/product/pdf/CSA-310_309.pdf Regards, Javier El

Re: [time-nuts] FE-5680A firmware dump

2012-02-17 Thread Javier Herrero
Don forget the PSD813 :) It provides 128KB Flash and 8KB RAM... so it can be a bit more complicated Regards, Javier El 17/02/2012 11:09, Azelio Boriani escribió: In my opinion you don't need the power of an IDA-class disassembler to process an 8051-like code. The MCS51 family processors have

Re: [time-nuts] OCXO phase noise

2012-02-13 Thread Javier Herrero
Hi, Magnus, El 13/02/2012 09:06, Magnus Danielson escribió: On 02/13/2012 08:28 AM, Javier Herrero wrote: Hello all, I'm planning to use in an application this oscillator http://www.abracon.com/Precisiontiming/AOCJY.pdf in the 40MHz version. The phase noise data in the data sheet

Re: [time-nuts] OCXO phase noise

2012-02-13 Thread Javier Herrero
Thanks for your answers, Magnus and John. For now, I will take the 12dB value as a starting point until further confirmation. Regards, Javier El 13/02/2012 10:32, Magnus Danielson escribió: On 02/13/2012 10:16 AM, John Miles wrote: That is exactly my thinking, but I was looking for a second

Re: [time-nuts] OCXO phase noise

2012-02-13 Thread Javier Herrero
with the 10MHz unit, roughly a 20dB increase at 10Hz, a more or less 12dB increase at 100Hz, 6dB at 1000Hz, and around 3dB from that point. Regards, Javier El 13/02/2012 16:45, Javier Herrero escribió: Thanks for your answers, Magnus and John. For now, I will take the 12dB value as a starting

[time-nuts] OCXO phase noise

2012-02-12 Thread Javier Herrero
Hello all, I'm planning to use in an application this oscillator http://www.abracon.com/Precisiontiming/AOCJY.pdf in the 40MHz version. The phase noise data in the data sheet is for the 10MHz version. Is it possible to extrapolate these numbers to what I could expect in the 40MHz version?

Re: [time-nuts] Low-Cost Rubidium Performance

2012-02-09 Thread Javier Herrero
Hello, El 09/02/2012 21:06, Magnus Danielson escribió: I was just thinking about that. For these more modern 5680A, just the Q of the resonance and the loop filter / loop bandwidth would not allow for so much high frequency side-bands of the DDS to pass through. The loop filter at least

Re: [time-nuts] Low-Cost Rubidium Performance

2012-02-09 Thread Javier Herrero
El 09/02/2012 22:28, Magnus Danielson escribió: Consider that it is de-modulated and then low-pass filtered. Also, it is the alternating rate and not 1400 Hz difference in DDS setting which is the key parameter here. The 1400 Hz gives a hint of the Q-value however, which seems to be lower on

Re: [time-nuts] Low-Cost Rubidium Performance

2012-02-09 Thread Javier Herrero
El 10/02/2012 00:13, Javier Herrero escribió: El 09/02/2012 22:28, Magnus Danielson escribió: Consider that it is de-modulated and then low-pass filtered. Also, it is the alternating rate and not 1400 Hz difference in DDS setting which is the key parameter here. The 1400 Hz gives a hint

Re: [time-nuts] FE-5680A's suitability for use as a 10 MHz reference for microwave transverters

2012-02-08 Thread Javier Herrero
El 09/02/2012 01:40, Bob Camp escribió: Hi Here is a little more on how much of a problem you have. If you would like the spurs to be down 70 dbc at 10 GHz. They go up by 20 log N. in this case N is 1000. That gets you 60 db. Spurs at 10 MHz would have to be down at -130 dbc to make it at 10

Re: [time-nuts] Rubidium Performance

2012-02-05 Thread Javier Herrero
El 05/02/2012 22:27, John Miles escribió: John Thank you for your effort. It would be nice if you could confirm the 4 to 5 Hz dither that seems to be the loop time constant and long term aging that will influence the GPS/Rb control loop time constant setting. I did see 1 E-12 per month

Re: [time-nuts] Rubidium Performance: DDS noise effect on 10 MHz

2012-02-04 Thread Javier Herrero
Hello, John, Your phase noise plot seems quite similar to that sent by Said some time ago (4 Jan), that looks like a lot of spurs quite evenly separated. It is likely from the price and p/n that your unit is one of the newer ones with 60MHz xtal and the DDS inside the loop - and I would think

Re: [time-nuts] FE5680 DDS plot

2012-02-02 Thread Javier Herrero
Great plot :) I've a dump of the SPI transfers during a night taken with the logic analyzer... but have found no time yet to process the dump to extract the transfers. Of course it is easier to take it from the serial port data :) The adjustment looks quite closely related to the

Re: [time-nuts] FE5680 DDS plot

2012-02-02 Thread Javier Herrero
I forgot... have you had the opportunity to check if the difference between the two DDS programming words is the same in all cases? All my readings leds to 1400.00x Hz, I've not looked at it but probably the difference in DDS counts is constant. Regards, Javier El 02/02/2012 10:13, Javier

Re: [time-nuts] New Rubidium Frequency Standard Group

2012-02-02 Thread Javier Herrero
Me too. I think that this is a transient that will surely decay... and that also is leading to several constructive sub-threads that are not directly related with the FE-5680A but nevertheless very interesting and very time-nut related. I'm not interested to subscribe another list that

Re: [time-nuts] FE-.5680A trimming resolution

2012-01-31 Thread Javier Herrero
El 31/01/2012 20:43, Attila Kinali escribió: My current progress is that the uC i wanted to use does not do what i want. Can anyone recommend a uC with 32bit timers and IEEE 1588 support? You can have a look on these

Re: [time-nuts] FE-.5680A trimming resolution

2012-01-31 Thread Javier Herrero
El 31/01/2012 21:47, Attila Kinali escribió: This was exactly the device i intended to use. But it doesnt really have 32bit timers. They cascade two 16bit timers to get 32bit, but then all kind of restrictions apply which make the timers unusable. And when using 16bit timers, i'll get an

Re: [time-nuts] GHz output from fe5680a

2012-01-30 Thread Javier Herrero
El 31/01/2012 02:52, Magnus Danielson escribió: On 31/01/12 02:20, Bob Camp wrote: Hi Simple answer is don't bother. More complex answer - of course you can. You will get a forest of spikes (every 5, MHz or so ). Also, since the 5,3 MHz is modulated, 1,4 kHz apart is the two signals, and

[time-nuts] FE-.5680A trimming resolution

2012-01-29 Thread Javier Herrero
Hello, As it has been discussed in the past days, the architecture of the newer FE-5680A that has been recently purchased by a lot of us does not led to a trimming resolution through the serial port of 1.7854e-7Hz, but rather leds to think that the trimming resolution is in fact 6.80789e-6Hz

Re: [time-nuts] FE-.5680A trimming resolution

2012-01-29 Thread Javier Herrero
El 29/01/2012 13:57, Magnus Danielson escribió: Hi Javier, On 01/29/2012 12:45 PM, Javier Herrero wrote: Hello, As it has been discussed in the past days, the architecture of the newer FE-5680A that has been recently purchased by a lot of us does not led to a trimming resolution through

Re: [time-nuts] FE-.5680A trimming resolution

2012-01-29 Thread Javier Herrero
El 29/01/2012 14:45, Bob Camp escribió: Hi Very interesting. It sounds like dithering would be needed to get down to parts in 10^-14. If we do that from an external device (PC / PIC / FPGA / whatever) it would be useful to know the delay between the serial command and the DDS update. The

Re: [time-nuts] FE-.5680A trimming resolution

2012-01-29 Thread Javier Herrero
, Javier El 29/01/2012 19:37, Scott Newell escribió: At 05:45 AM 1/29/2012, Javier Herrero wrote: For example, the following data has been gathered: Serial offset 00 00 00 00 DDS A word: 44 02 62 F6 = 1141007094 = 5 313 228.32219 Hz DDS B word: 43 FD CC 8E = 1140706446 = 5 311 828.32085 Hz Can you

Re: [time-nuts] FE-.5680A trimming resolution

2012-01-29 Thread Javier Herrero
: At 05:45 AM 1/29/2012, Javier Herrero wrote: For example, the following data has been gathered: Serial offset 00 00 00 00 DDS A word: 44 02 62 F6 = 1141007094 = 5 313 228.32219 Hz DDS B word: 43 FD CC 8E = 1140706446 = 5 311 828.32085 Hz Can you do a test at +/- fullscale offset as well

Re: [time-nuts] FE-.5680A trimming resolution

2012-01-29 Thread Javier Herrero
El 30/01/2012 03:19, Chris Albertson escribió: On Sun, Jan 29, 2012 at 10:19 AM, Javier Herrerojherr...@hvsistemas.es wrote: El 29/01/2012 14:45, Bob Camp escribió: My next intention is to replace the OCXO in one of my Thunderbolts with a Rb and use a small microcontroller to get the

Re: [time-nuts] FE-5680A FAQ update: question about frequency synthesizer architecture

2012-01-28 Thread Javier Herrero
El 28/01/2012 00:17, claudio.gira...@virgilio.it escribió: Hello John, thanks for maintaining the 5680A FAQ; regarding its frequency resolution, have you checked the DDS FSELECT pin (and maybe also PSEL0/1) to see if they are doing some kind of dithering of the DDS frequency ? I've just checked

Re: [time-nuts] FE-5680A FAQ update: question about frequency synthesizer architecture

2012-01-28 Thread Javier Herrero
at FSELECT. I will try to play a bit more this evening :) Best regards, Javier -- Javier Herrero Chief Technology Officer EMAIL: jherr...@hvsistemas.com HV Sistemas S.L. PHONE

Re: [time-nuts] FE-5680A FAQ update: question about frequency synthesizer architecture

2012-01-28 Thread Javier Herrero
a bit more this evening :) Best regards, Javier -- Javier Herrero Chief Technology Officer EMAIL: jherr...@hvsistemas.com HV Sistemas S.L. PHONE: +34 949 336 806 Los

Re: [time-nuts] FE-5680A FAQ update: question about frequency synthesizer architecture

2012-01-28 Thread Javier Herrero
Only to note that I measured at the wrong place... the reference frequency to the DDS is 20MHz, not 10MHz as I stated :) Regards, Javier, EA1CRB El 28/01/2012 15:21, Javier Herrero escribió: El 27/01/2012 19:27, beale escribió: I added a bit to the electronics section of the FE-5680A FAQ

Re: [time-nuts] FE-5680A FAQ update: question about frequency synthesizer architecture

2012-01-28 Thread Javier Herrero
Javier Herrero wrote: Sat Jan 28 18:38:53 UTC 2012 It can be... but the resolution of the center frequency of two DDS frequencies would be limited to half DDS LSB... so not enough. I will try to monitor FSELECT and also to extract some SPI data if I found some free time today or tomorrow

Re: [time-nuts] FE-5680A FAQ update: question about frequency synthesizer architecture

2012-01-28 Thread Javier Herrero
-5680A. I'm starting to suspect that the claimed resolution of 1.7854^-7Hz is only for a serial protocol compatibility reason, and that really the effective tuning step for these Rbs is in fact around 6.81^-6Hz. Regards, Javier, EA1CRB El 28/01/2012 20:44, Javier Herrero escribió: I've

Re: [time-nuts] Thunderbolt GPS TimeKeeper

2012-01-23 Thread Javier Herrero
El 23/01/2012 19:29, Chris Albertson escribió: So back to time. If the goal is keeping good time then it is best not to use Microsoft Windows. There are good technical reasons having to do with the way MS Win. keeps and adjusts time. The bottom line is that you will never be able to do

Re: [time-nuts] finding time astronomically.

2012-01-23 Thread Javier Herrero
El 23/01/2012 21:43, Jim Lux escribió: One is where you lay the iphone on the table in a fixed position. One could use the internal accelerometers to determine level, but I don't think you could tell orientation, unless, perhaps, you can see circumpolar stars? That is, by watching the

[time-nuts] Help on processing some data

2012-01-18 Thread Javier Herrero
Hello, I've several data sets of frequency measurements taken at 500us intervals, and would like to extract phase noise data from them. In order to do a consistency check with my processing, could I request some help from any of you that have available Stable32 or other similar tool to

Re: [time-nuts] Lady Heather for a noob

2012-01-13 Thread Javier Herrero
El 13/01/2012 04:57, brent evers escribió: Hijacked thread. Yes - this would be great to see done on a linux machine. I don't know that much about LH, but something done cross platform (PyQt or such - could make binaries for win, linux, and mac) in a server/client config would be great. I

Re: [time-nuts] FE-5680A arrived

2012-01-12 Thread Javier Herrero
Hello, What kind of power supply are you using for it? If a switching one, perhaps this is the origin. Regards, Javier, EA1CRB El 12/01/2012 11:39, Chuck Forsberg WA7KGX N2469R escribió: I received my Ebay Tek 2712 spectrum analyzer Monday and I have been throwing software to read its data

Re: [time-nuts] US New Year countdown - accurate?

2012-01-02 Thread Javier Herrero
El 02/01/2012 23:33, Magnus Danielson escribió: The small TV set in the kitchen might be CRT while the big one in the living room is LCD (or any similar flat screen), and for the later double-buffering (or more) is employed as standard. These new screens are slow and create tons of artefact

Re: [time-nuts] US New Year countdown - accurate?

2012-01-02 Thread Javier Herrero
El 03/01/2012 00:48, Javier Herrero escribió: Around 7 yr ago, I gave a friend a GPS driven nixie clock, and he had fun taken a picture in which you can see that the second changes simultaneously in the TVE teletext clock and the nixie clock (both in screen and at the clock the second

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