Re: [time-nuts] unknown GPSDO

Thanks so far. I will have a look at the docs. The machine is running well, particularly the OCXO is performing very good when free running (without GPS signal). It is stable and its ADEV looks good (2E-10 at 10s). Not so the overall ADEV (when GPS locked) (1E-5 at 10s). It seems to not having

Re: [time-nuts] Question about HP-53132A decimal display

I think he wants to point out, that he doesn't mean the menu option, where you swap the american decimal point with the european (German?) decimal comma... Am 5. Juli 2017 06:38:36 MESZ schrieb Tom Van Baak : >Mark, > >It should be in the hidden "Utility menu" which you

Re: [time-nuts] How good is the left end of your ADEV curve?

What can I do at home, to observe such processes? Or is it way beyond any imagination to participate in any such experiments? Volker Am 25.01.2017 um 06:15 schrieb Hal Murray: ... How long will it be before we need a gravity-nuts list? ___

Re: [time-nuts] Sad news Ulrich Bangert

I am shocked to hear that. Urich was a very helpful friend, I've learned a lot from him. I'm so sorry to hear that. Please allow me to say some words in Ulrichs (and my) native language. Die Nachricht vom Tode Urich's hat mich sehr getroffen. Ich habe ihn als einen hilfsbereiten und offenen

Re: [time-nuts] I can't get a nice waveform from my rubidium !

Hi Claude, Am 17.04.2014 07:32, schrieb Claude Fender: connect an output directly to the oscilloscope, the shape is nearly squared and when I use a probe, the shape is nearly sine ! When I send a 10 MHz signal from a generator, the waveform is a clean sine with or whithout the probe. I

Re: [time-nuts] ADEV from phase or frequency measurement

then indeed they could be an issue. Bob On Mar 9, 2014, at 6:17 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote: On 09/03/14 22:36, Volker Esper wrote: Am 09.03.2014 19:46, schrieb Magnus Danielson: On 04/03/14 01:05, Volker Esper wrote: Am 03.03.2014 23:04, schrieb Magnus

Re: [time-nuts] ADEV from phase or frequency measurement

Am 09.03.2014 19:46, schrieb Magnus Danielson: On 04/03/14 01:05, Volker Esper wrote: Am 03.03.2014 23:04, schrieb Magnus Danielson: Volker, On 03/03/14 00:50, Volker Esper wrote: Sorry for the time delay... TIC: SR620 with Z3805 as external reference; signal source Nortel/Trimble GPSTM

Re: [time-nuts] ADEV from phase or frequency measurement

Danielson mag...@rubidium.dyndns.org wrote: On 09/03/14 22:36, Volker Esper wrote: Am 09.03.2014 19:46, schrieb Magnus Danielson: On 04/03/14 01:05, Volker Esper wrote: Am 03.03.2014 23:04, schrieb Magnus Danielson: Volker, On 03/03/14 00:50, Volker Esper wrote: Sorry for the time delay

Re: [time-nuts] SR620 binary dump

...I'll try that, too. Tomorrow. Volker Am 09.03.2014 00:29, schrieb Tom Van Baak: Using XREL exposes an additional digit of resolution. Set XREL to 1E7 and then you get ascii readings like: 1.E-4 -6.E-5 2.E-4 -1.4E-4 .0E-6 -1.9E-4 I should clarify. Yes, it appears

[time-nuts] ADEV from phase or frequency measurement

Hello dear fellow time-nuts, I stumbled over a question that may sound stupid to you: Is the usual ADEV plot the result of a phase or a frequency measurement? I get totally different results when comparing a phase and a frequency measurement of the same source. Or am I doing something totally

Re: [time-nuts] ADEV from phase or frequency measurement

is an array of frequency samples. Note you can also convert phase data to frequency data (by differentiating) and use the y form. Or convert frequency data to phase data (by integrating) and use the x form. /tvb - Original Message - From: Volker Esper ail...@t-online.de To: Discussion

Re: [time-nuts] comparing two clocks

Jim, If I get you right, you want to compare the 10MHz outputs (not the 1PPS). As Jim and Bob told us so far, the thing is to provide, that input A _always_ starts before input B (or the other way around). Connect the signals to an oscilloscope, and check, how much the phase differs - if the

Re: [time-nuts] GPS W/10KHz

Perry, you don't need 10kHz to build a GPS disciplined oscillator. GPSDOs are build with control loop response times in the range of some hours, so the loop will be absolutely happy with a 1PPS input. To keep the frequency stable at short times, you need a very stable quartz oscillator instead,

Re: [time-nuts] GPS W/10KHz

Thanks, Chris, I didn't gather that from his posting. It'd be up to Perrier to illuminate that point. Volker Am 08.02.2014 18:33, schrieb Chris Albertson: On Sat, Feb 8, 2014 at 3:44 AM, Volker Esper ail...@t-online.de wrote: you don't need 10kHz to build a GPS disciplined oscillator. GPSDOs

Re: [time-nuts] housing multiple GPS timing receivers in the same box.

http://www.ebay.de/itm/HP-58516A-GPS-1-4-signal-Distribution-Amplifier-Splitter-N-type-/300997787447?pt=US_Ham_Radio_Receivershash=item4614ddbf37 Am 04.02.2014 14:08, schrieb mike cook: Hi, Till now I have been putting receivers in individual boxes. So to limit the growing number of

Re: [time-nuts] Replacement fan in SR620

Magnus, Yes, and the EBM-Papst 624 matches it well. The Papst seems to have much lower noise from the datasheet. There's yet another problem: the mechanical construction conducts the fan noise to the case, so the noise is kind of amplified by the case. I felt somewhat disappointed after

Re: [time-nuts] Replacement fan in SR620

Magnus, I took an EBMPabst 624. Pabst has a good reputation. The original fan is a Delta Electronics DFB0624 H, Dimensions are 60mm x 60mm x 25mm, DC24V 0.11A Volker Am 01.02.2014 18:56, schrieb Magnus Danielson: Fellow time-nuts, I heard the fan in one of my SR620s and it didn't really was

Re: [time-nuts] EFC divider resistors

The ratio tempco is the point! It's hard to design a divider yourself, since temperature differences between the two divider resistors is the problem. Resistor networks with very low ratio tempcos are fairly expensive. I don't know your budget and how far you want to go. If you want to try it

Re: [time-nuts] EFC divider resistors

. Volker Am 31.01.2014 20:25, schrieb Volker Esper: The ratio tempco is the point! It's hard to design a divider yourself, since temperature differences between the two divider resistors is the problem. Resistor networks with very low ratio tempcos are fairly expensive. I don't know your budget

Re: [time-nuts] EFC divider resistors

Sorry, missing picture... Am 31.01.2014 20:47, schrieb Volker Esper: Here's how to place the divider resistors. The picture is from 1992, I didn't use SMDs then. But the results are promising at a very low price. Isolierband = insulation tape wärmeleit. Kern = thermoconducting core

Re: [time-nuts] EFC divider resistors

. From: Volker Esper ail...@t-online.de To: Robert LaJeunesse lajeune...@mail.com; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, January 31, 2014 1:51 PM Subject: Re: [time-nuts] EFC divider resistors Sorry, missing picture... Am 31.01.2014 20:47

Re: [time-nuts] Nortel GPSDO osc age alarm

. The DAC at limit is not a real good sign …. Bob On Jan 23, 2014, at 6:43 PM, Volker Esper ail...@t-online.de wrote: Hi! I bought a Trimble/Nortel GPSDO http://www.ebay.de/itm/300933951405?ssPageName=STRK:MEWNX:IT_trksid=p3984.m1497.l2648 and Lady Heather's now tells me that everything

Re: [time-nuts] Nortel GPSDO osc age alarm

Thanks so much, Nigel, for this very interesting mail. Yes, the voltages are exactly as my ones. And yes, I've removed the oscillator, already. I then removed the thermal isolation from the osc, as well as the label, in slight hope for a hidden tuning screw. Of course, there isn't any. I, too,

Re: [time-nuts] Nortel GPSDO osc age alarm

Ignacio, thanks for your message. Answeres within the text: And one word of caution: if you observe the cable that goes from the main board to the small interface board, you will see that one of the connectors is reversed so be careful if you make a custom one for your cabinet, do it in the

Re: [time-nuts] Nortel GPSDO osc age alarm

. Could you verify this on your unit when you change the OCXO and get it running? Best regards, Ignacio EB4APL On 24/01/2014 16:23, Volker Esper wrote: ...thanks, Bob, it seems to be the oscillator, that is at it's limit, it cannot tune to 10 MHz at full EFC voltage, see new thread (started

Re: [time-nuts] Nortel GPSDO osc age alarm

Oukaay - I should've known... Thanks, Jim! Am 24.01.2014 21:12, schrieb Jim Lux: On 1/24/14 11:57 AM, Volker Esper wrote: Nice! I didn't know that. But what a number, 300... Why such a digital-hostile factor? Why not 256 or 512? Volker Am 24.01.2014 20:51, schrieb tmil...@skylinenet.net

[time-nuts] Nortel GPSDO osc age alarm

Hi! I bought a Trimble/Nortel GPSDO http://www.ebay.de/itm/300933951405?ssPageName=STRK:MEWNX:IT_trksid=p3984.m1497.l2648 and Lady Heather's now tells me that everything is alright - except - DAC 6.04V - OSC BAD - osc age alarm The rectangle 10MHz output signal (J5) shows a signal at about

Re: [time-nuts] 32.768Khz Crystal/Resonator suggestions.

Hi Dan, I beg your pardon for being so curious, but where do you have to put electronics in a thousand G's at 100Hz? Thank you Volker Am 01.11.2013 17:30, schrieb Dan Kemppainen: Hi all, I've got a project upcoming that will require a frequency of 32.768 Khz in a harsh environment

Re: [time-nuts] exponential+linear fit

very cool Am 07.10.2013 09:46, schrieb Ulrich Bangert: Jim, most if not all fitting strategies make use of an assumption concerning the underlying model. For those who are not sure what the underlying model is this one http://creativemachines.cornell.edu/eureqa is the hottest tool that

Re: [time-nuts] 82357B GPIB USB from China

I bought one about a year ago but couldn't get it running under Win XP. There were a dozen well-meant advices on the forums that told me to read the firmware and flash the beast with a better one. However, I couldn't keep my nerve, so I purchased a Prologix adapter - which worked instantly.

Re: [time-nuts] My GPSDO project: OCXO Thermal Oscillation?

Hi Bob, treat your GPSDO like a closed loop control system. If you could optimize the process itself, e.g. make it's behaviour linear or eliminate environmental inluences, you should. Then you have to know the characteristics of your process (the transfer coefficients of the controlled

Re: [time-nuts] Rb video

The number on the front panel shows 53 on the current picture... That gives hope to those who still think about it... :-) Volker Am 08.08.2013 16:05, schrieb Dr. David Kirkby: On 8 August 2013 14:49, mc235960mc235...@gmail.com wrote: None left from that batch. Hope you got yours.

Re: [time-nuts] How dangerous if Rb lamp broken?

Thanks, Robert, for this detailed information. Volker Am 10.07.2013 21:01, schrieb Robert Atkinson: Hi Hui, This is a little off-topic for time nuts, but here goes. the Becquerel is a measurement of radioactivity, 1Bq being one decay per second. Bg/gm is specific activity so if you have 1g of

Re: [time-nuts] How dangerous if Rb lamp broken?

Hi, Toxicity is not the problem. Radioactivity was my biggest concern, when I ordered my first Rb-clock.The manufacturer told me, there's no radioactivity, that you have to fear. When the package came I used a Geiger tube to calm myself down - there was no measurable activity at all. If

Re: [time-nuts] How dangerous if Rb lamp broken?

Am 09.07.2013 14:16, schrieb Attila Kinali: If radioactivity is a concern, you should stop eating bananas and do not go down to your cellar. And for gods sake, stop flying! ;-) ...yes, and don't use mobiles and so on. Radioactivity is a concern, because I don't have any serious experience

Re: [time-nuts] How dangerous if Rb lamp broken?

Am 09.07.2013 13:49, schrieb Robert Atkinson: Why are so many people radiophobic? In my opinion, the answere isn't hard to find. Those people don't have any experience with it and don't know, which information is correct. Radiation can be dangerous, there's no doubt about it, is it? The

Re: [time-nuts] Question about effect of sample interval on ADEV

Bob, Sorry, I'm not sure, if I've understood the issue - what exactly did you wrong? Thank you Volker Am 08.07.2013 14:48, schrieb Robert Darby: John, After a night's sleep and a rereading of your post I finally realized what I was doing wrong. I did not understand the the role of

Re: [time-nuts] New to list and GPSDO questions

...but remember, you don't need 10kHz to get the control loop working. Since you need a time constant of some hours, the PPS output will do. Even more important is to use a good OCXO. By the way: welcome to the list :-) Volker Am 13.06.2013 12:20, schrieb cfo: On Wed, 12 Jun 2013

Re: [time-nuts] Ground loops in measurements?

Moin Attila, yes ground loops can cause serious measurement problems. And solving those could fill a hole book. Here's what I do in practical: 1.) avoid the loop 2.) if you can't, try harder to avoid it - depending on the problem: break up the dc loop by using capacitors (most often you only

Re: [time-nuts] Cesium wrist-watch-lite

...if I understand what the article says, the watch won't be the demo board. So it has to be the price for thhe sheet cube itself. Am 02.05.2013 01:31, schrieb Bob Camp: Hi Rummor has it that the single piece price in the US is $1475 for just the CSAC. Weather that's with or without the

Re: [time-nuts] Cesium wrist-watch-lite

Cool. Is the Symmetricom CSAC SA.45s available to mere mortals? Which price could we expect? Volker Am 01.05.2013 14:57, schrieb Poul-Henning Kamp: Looks a fair bit more comfortable than the one Tom's brother showed.

Re: [time-nuts] Z38XX

How do I recognize a wear out? Does the receiver send an error message every time I try to change the NVRAM or do I have to ask it? Volker Am 24.04.2013 00:08, schrieb Mark C. Stephens: Thanks Ulrich, Much Appreciated, prefer to use your software. Thanks Again, mark -Original

Re: [time-nuts] Z38XX

thanks Am 24.04.2013 13:22, schrieb Bob Camp: Hi At least on the 53131, the first sign of wear out was an error message. I believe it was a self test message (checksum error). I could easily be wrong about that. We blew them out within 9 months of when they were first introduced. That was

Re: [time-nuts] Z3805A OCXO p/n 3505A09422?

Yes, indeed, I've got one with a 10811 and one with a symmetricom 5 MHz oscillator with doubler. Volker Am 19.04.2013 01:15, schrieb Charles P. Steinmetz: Check the output on a spectrum analyzer for 5 MHz content. I've seen several internet-sourced Z3805As that were explicitly claimed to

Re: [time-nuts] LTC6957 Low Phase Noise Buffer/Driver

Am 17.04.2013 15:23, schrieb David: ... I have been looking into low jitter triggers for sampling systems recently and will probably end up using a discrete differential amplifier driving ECL logic. Why discrete? ___ time-nuts mailing list --

Re: [time-nuts] Low-pass Filter for 5 and 10 MHz

...but what about the phase jitter of the filter itself? While absolute phase shift may not (or may?) be an issue I guess that passive filters do have a phase jitter, too, due to mechanical vibration, tempco, and what else. Particularly at frequencies where the filter response has sharp

Re: [time-nuts] Connectors

Yes, I use those compression types, too, for example http://www.reichelt.de/F-Anschluss/IK-FKPS-49/3/index.html?;ACTION=3;LA=446;ARTICLE=87371;GROUPID=3538;artnr=IK+FKPS+49 Of course, everything has to match, the cable, the connector, the pliers. Be careful with the inner conductor. It's good

Re: [time-nuts] Low-pass Filter for 5 and 10 MHz

-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Volker Esper Sent: Friday, April 12, 2013 10:59 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Low-pass Filter for 5 and 10 MHz ...but what about the phase jitter of the filter itself? While

Re: [time-nuts] FE-5680 frequency jump

Thank you for this information, Bob! I have to reconsider the frequency jumps of my GPSDOs... Volker Am 05.04.2013 20:59, schrieb Bob Quenelle: I found the cause of the 4 mHz frequency jump. I have an LPRO-101, an FE-5680, power supplies and a Motorola M12T GPS board in a surplus case.

[time-nuts] SR620: cal error 23

Hi all, While auto calibrating the SR620 I get the message cal error 23 - the manual isn't that specific about this message, it only states, that error numbers 19 to 23 are caused by Stop TAC problems. However, the counter counts, but I can't do automatic calibration any more. Anyone

Re: [time-nuts] SR620: cal error 23

Am 18.03.2013 18:00, schrieb Herbert Poetzl: The manual also states that error codes 19-23 are the same as the start values (n - 16), so 23 minus 16 should be the same as '7' i.e. 'stop linearity byte out of range' Where do you read that, I can't find it :-/ Volker

Re: [time-nuts] SR620: cal error 23

Am 18.03.2013 19:53, schrieb Herbert Poetzl: page 40, search for 'stop tac' Herbert, you are the best :-) I didn't expect the error codes in the programming commands section. I'm afraid it could be a hardware failure. Thanks Volker ___

Re: [time-nuts] SR620: cal error 23

, tip, hint would be appreciated. Thank you Volker Am 18.03.2013 20:33, schrieb Volker Esper: Am 18.03.2013 19:53, schrieb Herbert Poetzl: page 40, search for 'stop tac' Herbert, you are the best :-) I didn't expect the error codes in the programming commands section. I'm afraid it could

Re: [time-nuts] HP53132A vs SR625

Hi, I just powered on my SR and looked for the offset, when the 10 MHz reference is connected to the input (at a gate time of 1s without further averaging). It shows an offset of 0 to 400uHz which should represent a mean error of 2E-11, while the manual predicts an error of about 1E-10 (as

Re: [time-nuts] HP53132A vs SR625

What small error are we speaking about? The statement that SRS users have to tolerates a small error while HP users don't seems a little to general to me. IMHO we might be a bit more precise. Anyone who's already done an error analysis for - say - a 10MHz count and a comparison of the

Re: [time-nuts] Distribution amplifier phase noise

Am 14.03.2013 19:02, schrieb Bruce Griffiths: This paper is very sloppily written. e.g.: Yes, actually. ___ 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

Re: [time-nuts] Thunderbolt antenna

Hi Peter, Why not. The antenna is optimized for that purpose (receiving GPS L1), omnidirectional and tuned to the GPS frequency, snow skids down, birds can't land on it. As N0UU affirms, there's nothing further sensational inside. I don't know, how proficient you are with radio frequency

Re: [time-nuts] Thunderbolt antenna

To me, that seems to be a much more important issue than suggestions about the right cable. Volker Am 10.03.2013 21:48, schrieb Bob Camp: Hi You do need to be a little careful with gain. Past a certain point, you do no more good for the noise figure of the system , but you do degrade the

Re: [time-nuts] Don't use cheap cables -- a cautionary tale

Yes, we all have to learn that lesson... At the time I use bedea RG-223 and Belden H155 with soldered and crimped Telegaertner BNC connectors as general purpose cable (up to 2 GHz). Above that frequency I wouldn't use BNC. If you simply connect your tracking generator with the spectrum

Re: [time-nuts] Don't use cheap cables -- a cautionary tale

RG-223 fits with Telegaertner J01000B0608 (Solder), Buerklin 78F201 or Rosenberger 51S107-108N4 (Crimp) (straight plugs BNC) H155 fits with Telegaertner T00100B3300 N Crimp) ... Am 03.03.2013 19:50, schrieb Henk ten Pierick: Hi, The use of double shielded cables does raise the question to

Re: [time-nuts] Z3805A/58503A time receiver : 2 questions

with a multimeter the voltage at the center pin of your N connecter antenna plug. It has to show 5 Volts, otherwise your antenna can't be working well. Volker Am 28.02.2013 01:26, schrieb Volker Esper: Hi Claude! Said says, you should see 6+ sats, I guess he means _at_least_ six. I'm almost

Re: [time-nuts] Z3805A/58503A time receiver : 2 questions

Hi Claude! Said says, you should see 6+ sats, I guess he means _at_least_ six. I'm almost sure, you've got a 6 channel receiver, so you naturally cant't get more than 6 sats at a time. There are some different models of the Z3805A out there, though they're all named the same. I've got two

Re: [time-nuts] Z3805A/58503A time receiver : 2 questions

I just calculated the frequency offset. I count 5 crosses, while jumping down to 200 ns, I guess, 1 cross equals 10 min? So let's say the jump lasts 60 min (= T jump). When we want to calculate the frequency offset out of a phase jump, we have to differentiate the phase and we should achieve

Re: [time-nuts] Z3805A/58503A time receiver : 2 questions

, otherwise your antenna can't be working well. Volker Am 28.02.2013 01:26, schrieb Volker Esper: Hi Claude! Said says, you should see 6+ sats, I guess he means _at_least_ six. I'm almost sure, you've got a 6 channel receiver, so you naturally cant't get more than 6 sats at a time

Re: [time-nuts] Looking for Z3801

...3805... better receiver... Bear in mind, there are several versions out there with very different receivers and oscillators. I've got one with an 8-channel- and one with a 16-channel receiver. Volker Am 14.02.2013 22:12, schrieb Rex: Here is a Z3816a -- 271152849045 I don't know the

Re: [time-nuts] switchers

No shipment to Europe... Am 13.02.2013 21:51, schrieb Don Latham: lot of 4 16 in 12 out, 251144853198 Don ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and

Re: [time-nuts] Nifty MINI TIC for DMTD

I bought a stereo microscope some days before and I agree with Bob. I keep building non-RF projects the classical way (through hole) but if it comes to radio frequency I prefer SMD since high frequency is easier to handle. Can you tinker with the idea of buying a stereo microscope? It's

Re: [time-nuts] HP53132A vs SR625

If the SR is in good shape I would prefer the SR. I love my one not only for it's technical data but also for the way of operation. Less menues, more controls, logically arranged. Volker Am 07.02.2013 17:53, schrieb Azelio Boriani: The SR625 at the same price of the HP53132A: either the

Re: [time-nuts] ***SPAM*** Brad Parkinson: GPS for Humanity

oh, well, very interesting and delighting Thanks, Hal! Am 02.02.2013 09:51, schrieb Hal Murray: Stanford has an Engineering Heroes program. http://engineering.stanford.edu/about/heroes Brad Parkinson was elected last year. This is the video of his talk last May. In case you don't

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

My friend Karl-Heinz DJ7NN has dragged/jerked/teared/wrenched crystals even more (what is the most nasty description of pulling a quartz crystal?) - if need be, he opens it and strikes a brush over it to carefully grind some material, what makes it oscillating a little faster. If you've

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

If you need a very clean signal - what would mean, stable (and accurate) you'll have to purchase one. There are manufacturers that do the job for, say, 30 Dollars? if it is a normal cut. If you like to get a crystal for a specific temperature to build your own oven (to achieve a very stable

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

Here an example manufactorer in my country: http://www.quarztechnik.com/eng/hochfrequentequarze.html or http://www.icmfg.com/ Am 18.01.2013 01:31, schrieb Volker Esper: If you need a very clean signal - what would mean, stable (and accurate) you'll have to purchase one

Re: [time-nuts] 1970's flashback

Thanks, Joe. Though I don't have such time equipment, the pictures are fascinating me and make me recall the days when the name HP stood for High Precision (or High Price) rather than for cheap printers. Those days are gone... Volker Am 13.01.2013 12:27, schrieb Dave Brown: Thanks for

Re: [time-nuts] Z3805A cooling requirements?

term) but with an external oscillator. I've got an HP 10544 (similar to the 10811), which could be the reference for external time interval measurement. I'll need some more days... Volker Am 22.12.2012 19:14, schrieb Magnus Danielson: On 12/22/2012 06:44 PM, Volker Esper wrote: Thank you

Re: [time-nuts] time-nuts Digest, Vol 101, Issue 152

not affect the 10 s ADEV since the OCXO tries its best to isolate the oscillator from short time temperature influences. However, the turbulent air flow that I applied will influence the longer time ADEV. Have a nice solstice Volker Am 21.12.2012 12:44, schrieb Volker Esper: Yes, I

Re: [time-nuts] time-nuts Digest, Vol 101, Issue 152

the posing under Digest are hidden from view and searching. You can edit the subject line but this does not always return to the old thread if you use he reply button. I think it depends on the mail client. Alan G3NYK - Original Message - From: Volker Esper ail...@t-online.de

Re: [time-nuts] Z3805A cooling requirements?

Yes, I made such a setup, it's now running 22 hours. I'll post the results in two hours or so (if nothing evil happens to the earth, meanwhile). Volker Am 21.12.2012 03:35, schrieb saidj...@aol.com: Wish I had more time to play with this setup. How about fellow time nuts spend some time

Re: [time-nuts] Grounding

Simon, Welcome to the list! Since I'm working on grounding problems for some 20 years I can confirm this an important issue. Many of my engineer colleagues do not have a clue about it. The article you recommended describes the thing very clearly. I will recommend it my colleagues and use it

Re: [time-nuts] Z3805A cooling requirements?

the oscillator from short time temperature influences. However, the turbulent air flow that I applied will influence the longer time ADEV. Have a nice solstice Volker Am 21.12.2012 12:44, schrieb Volker Esper: Yes, I made such a setup, it's now running 22 hours. I'll post the results in two hours

Re: [time-nuts] time-nuts Digest, Vol 101, Issue 152

the OCXO tries its best to isolate the oscillator from short time temperature influences. However, the turbulent air flow that I applied will influence the longer time ADEV. Have a nice solstice Volker Am 21.12.2012 12:44, schrieb Volker Esper: Yes, I made such a setup, it's now running

Re: [time-nuts] time-nuts Digest, Vol 101, Issue 154

, Issue 152 (Said Jackson) 2. Re: Brooks Shera (Chris Albertson) 3. Re: Z3805A cooling requirements? (Volker Esper) 4. Re: A Day in the Life of Five PPS Sources.. (Tom Miller) 5. Re: time-nuts Digest, Vol 101, Issue 152 (Volker Esper

Re: [time-nuts] Z3805A cooling requirements?

Diagram 2 shows the MDEV values of my GPSDO varying over the time, due to blowing air at the OCXO - not the frequency of an OCXO. I'm still hoping, that my MDEVs do not age :-) Am 22.12.2012 04:00, schrieb Bob Camp: Hi In most cases, when you see an OCXO (or TCXO) begin to rise past a few

Re: [time-nuts] Z3805A cooling requirements?

slowly, but it doesn't settle. It's increasing more and more. So it is the short term stability, that is affected, rather than the long term stability. Am I right or wrong? Perhaps I'm to tired to decide. Volker Am 22.12.2012 03:54, schrieb Volker Esper: Here come the curves... You'll

Re: [time-nuts] Considerations When Using The SR620

I'm curious, which way you went and which accuracy you achieved... :-) Can you tell us? Volker Am 06.12.2012 19:10, schrieb Paul DeStefano: On Tuesday, 4 December 2012, Tom Van Baak wrote: We are using the SR620 to measure the interval between 1PPS signals from two clocks. One is the

Re: [time-nuts] Z3805A cooling requirements?

Steward, What is the intended and what is the actual supply voltage? Which current is the unit consuming? When we know that, we can compare the power consumption with our units. If it is in the same range, it should - with a little luck - be working properly. My two units are intended to

Re: [time-nuts] Z3805A cooling requirements?

It's the same as with the SR620 TIC. As long as you have only one common chamber for all parts, you have to make tradeoffs for everyone: the power supply needs cooling (as much as it can get), the control loop of the oven is not designed for additional cooling, and comparators and further

Re: [time-nuts] Z3805A cooling requirements?

Indeed? I didn't expect that. There are people who say, that the control loop of OCXOs is optimized for still air and no additional cooling at all. Said told us, that... ...a fan is about the worst thing you can do for your Z3805 it will significantly worsen the stability of the output

Re: [time-nuts] GPSDO Alternatives

Am 05.12.2012 18:31, schrieb Bob Camp: Hi If the intent is to come up with something in the same league as the TBolt there are a few other things you will need: 1) Something to compare the two pps signals to within 0.1 ns Following Ulrich Bangerts suggestions, that a loop time constant

Re: [time-nuts] Considerations When Using The SR620

Tom, I agree. Since Paul want's to use an SR620 I presume he needs precision. Otherwise almost any TIC with a fairly stable osc would do, for example one with a battery backup. So I further presume that he needs nearly the full accuracy / stability. But that's just speculation, surely Paul

Re: [time-nuts] Introducing myself

Welcome, Erich! (By the way, are you from Germany?) Volker Am 02.12.2012 21:06, schrieb Erich Heine: Hi everyone. I just wanted to introduce myself to the list. My name is Erich Heine, I'm a researcher at the University of Illinois. I am a programmer attached to a couple of projects, but

Re: [time-nuts] Termination talk

...yeah - it's better not to know those people ;-) ... Am 29.11.2012 08:28, schrieb Ulrich Bangert: Simon, ...which prefers to remain anonymous... sounds as if it were a group of criminals or so. Best regards Ulrich Bangert -Ursprüngliche Nachricht- Von:

Re: [time-nuts] Z3805 incident

2012-11-28 10:01:40: Starting with status LOCK for example means that Z38XX is unaware of the receiver status and assumes that the status is locked. 73s de Ulli, DF6JB -Ursprüngliche Nachricht- Von: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] Im Auftrag von Volker

Re: [time-nuts] Z3805 incident

...and I should see the loop time constant in the ADEV, too - if that is the case, the time constant should be about 2000 s, shouldn't it? (see picture) Volker Am 29.11.2012 05:35, schrieb Said Jackson: Volker, This is a classic crystal jump. The crystal changed its frequency magically

Re: [time-nuts] Z3805 two frequency maxima

I agree. Please, Paul, start a new thread, and we'll be there. Volker Am 28.11.2012 08:10, schrieb Hal Murray: You might get better answers by starting a new thread rather than hiding your question in an existing thread. (Use your New message button rather than Reply, and cut-paste the To

Re: [time-nuts] Z3805 two frequency maxima

, schrieb Volker Esper: Now, that you ask: the measurements are in that range, yes, though it's not exactly the values. time shift 12ns - spacing 10ns 28ns 35ns 66ns 55ns 0ns 8ns and yes, the peaks get closer while reducing the amplitude of the 5MHz, it's almost exactly linear: With the 10MHz

[time-nuts] Z3805 incident

When looking at the PPS TI vs. time curve today I felt kind of appalled - a big incident peak (not an outlier) on the curve! See picture. What happened to my Z3805? Any idea? No entry in the error log, the staus log says 2012-11-28 10:01:30: The Smartclock Status has changed to LOC 2012-11-28

Re: [time-nuts] Z3805 incident

Not Rb but OCXO vs GPS... Am 28.11.2012 22:47, schrieb Azelio Boriani: Ops, I missed the EFC value... On Wed, Nov 28, 2012 at 10:43 PM, Azelio Boriani azelio.bori...@screen.itwrote: The reference is still the Rb? Then how you can tell which of the two is doing that... On Wed, Nov 28, 2012

Re: [time-nuts] Z3805 two frequency maxima

I followed your argument and tried to synthesize such a signal. I built a simple power combiner (3 times 18 ohms resistors) and combined the 10 MHz reference output of my signal generator with a 5 MHz signal from the same generators regular output at the same amplitude. My oscilloscope

Re: [time-nuts] Z3805 two frequency maxima

that done in practice. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Volker Esper Sent: Tuesday, November 27, 2012 2:34 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Z3805 two frequency maxima I

Re: [time-nuts] Surge Arresters

There's not much in this world that is able to reliably protect a radios input from a direct lightning hit (maybe a block of copper instead of the antenna...). But a surge protector (sometimes called EMP protector or surge arrester) can increase the probability that a nearby lightning strike

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