Re: [time-nuts] Commercial software defined radio for clockmetrology

2016-08-10 Thread Kevin Rosenberg
Hi Mangus, No apologies necessary. Your music festival sounds more like it was more fun than the process review and implementation direction conference that I just returned from! It is very kind of you to share your detailed knowledge on this subject. It is extremely relevant to what I am

Re: [time-nuts] Commercial software defined radio for clockmetrology

2016-07-31 Thread Kevin Rosenberg
Hi Tom, Thanks for your thoughts. I had looked at your helpful page when I started researching the effects of averaging. Currently, I’m experimenting with the dual receivers in the SDR using cross-correlation to reduce the noise floor. Kevin > On Jul 30, 2016, at 5:08 PM, Tom Van Baak

Re: [time-nuts] Commercial software defined radio for clock metrology

2016-07-30 Thread Kevin Rosenberg
Hmm, I might have answered my own question: filter to the fast samples to the equivalent noise bandwidth (ENBW) of the lower desired sampling rate and then decimate. > On Jul 29, 2016, at 9:44 PM, Kevin Rosenberg <ke...@rosenberg.net> wrote: > > Hi Bob, > > You have a g

Re: [time-nuts] Commercial software defined radio for clock metrology

2016-07-29 Thread Kevin Rosenberg
of the averaging window? I’d appreciate your thoughts on the subject, Kevin > On Jul 29, 2016, at 6:51 PM, Bob Camp <kb...@n1k.org> wrote: > > HI > > Keep in mind that if you apply pre-filtering, an ADEV plot is lying to you …. > > Bob > >> On Jul 29, 2

Re: [time-nuts] Commercial software defined radio for clock metrology

2016-07-29 Thread Kevin Rosenberg
Jeff, Thanks for your very useful paper Oscillator Metrology with SDRs[1]. I created a C++ program and checked residuals using a 10 MHz clock split to the A and B channels of a LFRX and BasicRX boards and sampled at 1 Mhz. Using boxcar averaging of 1000 samples at 1 kHz, I was impressed by the

[time-nuts] SRS CG635 Schematic

2014-11-06 Thread Kevin Rosenberg
Hello, I purchased a used Stanford Research System CG365 clock generator that is without a printed manual. As SRS's online manuals do not include schematics, does someone have a link to, or a copy of, the CG635 schematics that they would share with me? Thanks! Kevin

Re: [time-nuts] Some videos from the recent Symmetricom 3120A webinar

2013-06-28 Thread Kevin Rosenberg
On Jun 26, 2013, at 10:13 PM, John Miles j...@miles.io wrote: Here are some short demo videos that we used in our webinar recently (http://www.symmetricom.com/resources/downloads/webcasts/#Government%20Solut ions ). They're focused on the Symmetricom 3120A test set (née TimePod 5330A) but

Re: [time-nuts] ngTADD-1

2013-04-26 Thread Kevin Rosenberg
Thanks to all for the very helpful discussion. Appreciatively, Kevin On Apr 25, 2013, at 9:26 AM, Chris Albertson albertson.ch...@gmail.com wrote: The problem with analog 10MHz is the non-linear parts at each end of the fiber optic. It would be hard to get a nice sine wave at the output.

Re: [time-nuts] ngTADD-1

2013-04-24 Thread Kevin Rosenberg
On Apr 23, 2013, at 4:16 PM, Bob Camp li...@rtty.us wrote: There are optical links that are better than your typical opto coupler. I have not seen many that are good to -170 dbc. Rather than for a 10 MHz signal, I might prefer an optical link rather than differential for a PPS signal. Could

Re: [time-nuts] ngTADD-1

2013-04-24 Thread Kevin Rosenberg
On Apr 24, 2013, at 2:50 AM, Attila Kinali att...@kinali.ch wrote: [...] low jitter (sub 1ns rise/fall times). For the transmitters, if possible go for those with laser diodes and modulate them (ie no on-off switching). This will give you jitter way below 1ns (sorry, don't know any hard

Re: [time-nuts] ngTADD-1

2013-04-23 Thread Kevin Rosenberg
On Apr 23, 2013, at 4:43 AM, Bob Camp li...@rtty.us wrote: Like any design, the first question is - what's the goal? My favorite first question, too. Move my most stable OXCO in the 1 Hz to 10 KHz range to the more stable environment, and maintain its phase noise of -100 dBc/Hz @ 1 Hz and -170

Re: [time-nuts] ngTADD-1

2013-04-23 Thread Kevin Rosenberg
On Apr 23, 2013, at 2:24 AM, WB6BNQ wb6...@cox.net wrote: I had to buy the three components at three different places. The TOSLINK receiver came from Mouse (p/n 757-TORX177F,T) and cost $1.31. The TOSLINK transmitter came from DIGIKEY (p/n 1080-1428-ND) and cost $0.866. At the time, for

Re: [time-nuts] ngTADD-1

2013-04-23 Thread Kevin Rosenberg
On Apr 23, 2013, at 4:04 PM, Bob Camp li...@rtty.us wrote: If you are only worried into 1 Hz or even 0.1 Hz, temperature on the coax will not be a big issue. If you are trying to maintain 170 dbc at the far end of the wire, shielding and isolation will be a *big* issue. You may need some

[time-nuts] ngTADD-1

2013-04-22 Thread Kevin Rosenberg
I hope all is going well with your next-generation TADD-1. I'm thinking just thinking about putting a T-bolt disciplining a PRS-10 discipling a Soekris 4501. I was thinking a TADD-1 one would be nice for driving 10 MHz line to another room with the TADD-1 also providing galvanic isolation.

Re: [time-nuts] ngTADD-1

2013-04-22 Thread Kevin Rosenberg
On Apr 22, 2013, at 7:13 PM, Bob Camp li...@rtty.us wrote: U, e. Even with all the mods, a 4501 is a fairly low resolution device. It's an amazing little box and I have several of them. Some (but not all) with the mods actually done correctly. Ummm, apologies for the errant posting

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

2013-03-03 Thread Kevin Rosenberg
On Mar 3, 2013, at 7:59 AM, John Ackermann j...@febo.com wrote: Lesson learned -- use only double-shielded cable in the oscillator rack (and in any RF measurement path) from now on. I've learned that lesson as well. John Miles said that RG-58 is occasionally referred to as 'soaker hose'.

Re: [time-nuts] Brooks Shera

2012-12-21 Thread Kevin Rosenberg
If needed, I can provide some local help. Karen's address is a short drive from my home. Kevin On Dec 21, 2012, at 7:15 AM, paul swed paulsw...@gmail.com wrote: Bert A thought has crossed my mind here. His wife can not access his computer. If its windows XP or earlier the password is

Re: [time-nuts] 3120A Phase Noise Test Probe

2012-12-01 Thread Kevin Rosenberg
Magnus Danielson wrote: Congratulation John! Good work! Truly well-deserved, John! Kevin ___ 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] Warning if buying from directly from Agilent via eBay with Paypal.

2012-11-17 Thread Kevin Rosenberg
On Nov 17, 2012, at 5:29 PM, David Kirkby david.kir...@onetel.net wrote: It is Agilent - at least to the extent I can determine. Some reported [...] Also to the extent that I could determine. All emails after the sales were from the UK offices of Agilent. Any emails sent to

Re: [time-nuts] Warning if buying from directly from Agilent via eBay with Paypal.

2012-11-17 Thread Kevin Rosenberg
On Nov 17, 2012, at 4:37 PM, Don Latham d...@montana.com wrote: I'm wondering if agilentused is really part of the Agilent corp or whatever it's called? or an independent company entirely? My only and last $.02! I reviewed my email archive. Emails regarding my purchase from agilentused came

Re: [time-nuts] Best counter setting for ADEV?

2012-10-03 Thread Kevin Rosenberg
On Oct 2, 2012, at 1:39 PM, saidj...@aol.com wrote: 1) calibrate the internal 100MHz vectron OCXO using a small screwdriver, this is not really critical though as the unit does not really function as a frequency counter. 2) Calibrate the power supplies for proper voltages if necessary

Re: [time-nuts] Best counter setting for ADEV?

2012-10-03 Thread Kevin Rosenberg
On Oct 3, 2012, at 11:15 AM, saidj...@aol.com wrote: The CSAC is cheap compared to the reference you need to measure it... http://www.leapsecond.com/pages/csac/log96872v.gif Nice plot! Yes, I'd have trouble measuring 10E-14 at 10E5 seconds. Kevin

Re: [time-nuts] Best counter setting for ADEV?

2012-10-03 Thread Kevin Rosenberg
On Oct 3, 2012, at 6:52 PM, Kevin Rosenberg ke...@rosenberg.net wrote: Nice plot! Yes, I'd have trouble measuring 10E-14 at 10E5 seconds. Sorry, 1E-14 at 1E5. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com

Re: [time-nuts] Automatic switching of a µC osc. to external 10MHz reference as clock?

2012-09-11 Thread Kevin Rosenberg
On Sep 11, 2012, at 4:42 PM, Peter Krengel krengelda...@gmx.de wrote: I'm looking for a possibility to make an automatic switching between the internal µC oscillator (Atmel µC) to the 10MHz output of my thunderbolt to use it as a precise µC clock. Has anybody an idea how to do best without

Re: [time-nuts] ublox chip sets - what GPS device should I buy?

2012-08-31 Thread Kevin Rosenberg
On Aug 31, 2012, at 4:05 PM, David Kirkby david.kir...@onetel.net wrote: I don't have it yet, but bought it on eBay today from the seller agilentused which is Agilent, and sells used/ex-demo units which have been reconditioned, and have a fully warranty. Since I have not [...] I bought my

Re: [time-nuts] Tidbit for Soekris 4501 NTP users

2012-08-19 Thread Kevin Rosenberg
On Aug 19, 2012, at 12:15 PM, John Ackermann N8UR j...@febo.com wrote: This is probably something that very, very few other people are going to encounter, but thought I would note it here for posterity. Thanks! You've already helped one person. I ran up against that problem when testing one

Re: [time-nuts] TimePod, cross-correlation fun and measurements

2012-06-17 Thread Kevin Rosenberg
On Jun 17, 2012, at 9:32 PM, Joseph Gray jg...@zianet.com wrote: I was recently reading the manual for the TimePod. It looks quite nice. I'm curious as to the price. Or is this a case of if you have to ask, you can't afford one? The price is right on the TimePod web site: http://www.miles.io.

Re: [time-nuts] NTGS50AA 1pps

2012-05-04 Thread Kevin Rosenberg
On May 3, 2012, at 11:27 PM, Murray Greenman wrote: No, I've not found a 1PPS output. Not that I've looked, and I don't have the official pinouts for the big connector on the back. It would be easy enough to synthesize one, for example using a divider on one of the other products, resetting

Re: [time-nuts] NTGS50AA, better than Thunderbolt

2012-05-03 Thread Kevin Rosenberg
On May 3, 2012, at 1:18 PM, Murray Greenman wrote: I agree with you. I've been using an NTGS50AA here for some time, and it is an excellent unit with none of the thermal problems of the Tbolt. Easily as good as the old Z3801A, and much lower power consumption. I use the NTGS50AA with the

Re: [time-nuts] NTGS50AA, better than Thunderbolt

2012-05-03 Thread Kevin Rosenberg
On May 3, 2012, at 2:08 PM, Steve wrote: Did the seller double the shipping cost today? I could have sworn it was $30 the last time I looked at the listing. I paid $30 shipping early today. Kevin ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] NTGS50AA, better than Thunderbolt

2012-05-03 Thread Kevin Rosenberg
On May 3, 2012, at 7:21 PM, Sam wrote: Kevin, you asked if there was a PPS output. There isn't a 1PPS output at all, but there is a Even Second output with a negative pulse, 40-60 ns wide. This is available via the font mounted SMB connector or via the rear 110-pin AMP Z-pack connector.

Re: [time-nuts] WWVB phase-modulation test

2012-04-16 Thread Kevin Rosenberg
On Apr 14, 2012, at 10:45 PM, Shaun Merrigan wrote: Just wondering if anyone on the list is monitoring their WWVB gear at the moment? I got in a bit late, but I have been recording my 8170 since about 0300 and it has remained locked. QTH here is about 1500km north of Ft. Collins. Spectracom

Re: [time-nuts] WWVB phase-modulation test

2012-04-14 Thread Kevin Rosenberg
On Apr 14, 2012, at 10:45 PM, Shaun Merrigan wrote: Just wondering if anyone on the list is monitoring their WWVB gear at the moment? I got in a bit late, but I have been recording my 8170 since about 0300 and it has remained locked. QTH here is about 1500km north of Ft. Collins. I've been

Re: [time-nuts] 1 pps correction

2012-03-31 Thread Kevin Rosenberg
On Mar 31, 2012, at 12:33 PM, Brooke Clarke wrote: But for the general first case the hardware solution with the delay line is the only way. I think there may be an exception specifically for the PRS10 in that it may accept a sawtooth correction on the RS-232 input (I seem to remember

Re: [time-nuts] Agilent 53230A Counter

2012-03-10 Thread Kevin Rosenberg
On Mar 10, 2012, at 7:12 AM, Adrian wrote: just wondering if anyone has tried the new Agilent 53230A counter? I like it quite a bit. The YouTube videos by Agilent do a fair job showing the instrument and are worth a few minutes if you are interested. Using TimeLab with John's new TCP/IP

Re: [time-nuts] Temperature and signal amp for 'Bay FE-5680A?

2012-01-07 Thread Kevin Rosenberg
On Jan 7, 2012, at 10:39 AM, Chris Albertson wrote: I think this is exactly what you want. An RF distribution amp using video amplifier chips. The kit is no longer available but the schematic is. Look near the end of the user manual and you can get that here. This design is well tested and

[time-nuts] Temporal cloaking in Nature journal

2012-01-04 Thread Kevin Rosenberg
The abstract and a two graphics are online at http://www.nature.com/nature/journal/v481/n7379/full/nature10695.html ___ 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] Another Trimble Thunderbolt-like GPS?

2011-12-19 Thread Kevin Rosenberg
On Dec 19, 2011, at 11:59 AM, Chris Albertson wrote: Where is the source code for Lady Heather? It's included with the binary distribution. Kevin ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] DG535 triggering problem

2011-12-16 Thread Kevin Rosenberg
Hello, Thanks to Brooke's excellent web page [1] on getting the DG535 80 MHz clock working, I was able to fix the Ext Clk Err on a DG535. Everything on the front panel seems to work. However, triggering does not work. I can't get a trigger to occur in any triggering mode. Setting the triggering

Re: [time-nuts] DG535 triggering problem

2011-12-16 Thread Kevin Rosenberg
On Dec 16, 2011, at 11:25 AM, Brooke Clarke wrote: Just a guess. If line triggering does that there may be a problem with the power transformer. Use an Ohm meter to locate the transformer terminals for the AC line and then check from one of those to all the other terminals. I suspect

Re: [time-nuts] DG535 triggering problem

2011-12-16 Thread Kevin Rosenberg
On Dec 16, 2011, at 11:25 AM, Brooke Clarke wrote: Just a guess. If line triggering does that there may be a problem with the power transformer. Use an Ohm meter to locate the transformer terminals for the AC line and then check from one of those to all the other terminals. I suspect

Re: [time-nuts] Using GPS 1PPS for accurate period measurement

2011-12-02 Thread Kevin Rosenberg
On Dec 2, 2011, at 10:59 AM, Hal Murray wrote: I've been playing with one of the Dallas DS32KHZ parts. I'm guessing you are [...] Another possibility is that I didn't ground the NC pins. (I didn't notice that in the data sheet until I read it again looking for crap like that.) Using a

Re: [time-nuts] Using GPS 1PPS for accurate period measurement

2011-12-02 Thread Kevin Rosenberg
On Dec 2, 2011, at 4:12 PM, Azelio Boriani wrote: Man, what should we follow if not the manufacturer datasheet? Everyone can [...] Oh, I have an active imagination and tried a 1/2 dozen different ideas. But, lesson learned! Kevin ___ time-nuts

Re: [time-nuts] Symmetricom TimeSource 2700

2011-11-29 Thread Kevin Rosenberg
Hi Charles, Thanks very much for the information on the pinout of the TOD connector on the TS2700. I verified the PPS signal between pins 6 and 1. It's duration and voltage matches your report. I compared the timing of the PPS signal with the PPS of two synchronized thunderbolts. Interesting,

Re: [time-nuts] Thunderbolt Monitoring for Pocket PC

2011-11-26 Thread Kevin Rosenberg
On Nov 25, 2011, at 3:55 PM, Justin Pinnix wrote: A while back, I scored an old Compaq iPaq Pocket PC for cheap at an auction. Recently, I wrote a program for it that reads the time and health information from a Thunderbolt and displays it in real-time. More info available here:

Re: [time-nuts] Clocking a PIC16F628A from a Rubidium Standard

2011-11-26 Thread Kevin Rosenberg
On Nov 26, 2011, at 10:36 AM, Don Latham wrote: Come on, folks. never hook anything directly to the power line. The source is just too stiff. Use an opto. I used fiber optic isolation with my big DC power supply. I don't disagree on isolation. I will say that Atmel's (and presumably

Re: [time-nuts] Clocking a PIC16F628A from a Rubidium Standard

2011-11-25 Thread Kevin Rosenberg
On Nov 25, 2011, at 1:17 AM, Attila Kinali wrote: Using the protection diodes as part of the circuit is bad design practice. In general, I agree completely, Further, I think of operating outside of the datasheet may result in any manner of unspecified behavior. Basically, results while operating

Re: [time-nuts] Symmetricom TimeSource 2700

2011-11-24 Thread Kevin Rosenberg
On Nov 24, 2011, at 9:25 AM, Charles P. Steinmetz wrote: I did a little investigating, and it turns out that the TOD displayed in the BTMon windows is the local system time, NOT time received from the TS2700. Apparently, the TS2700 does not send TOD on the Craft output. Hi Charles, When I

Re: [time-nuts] Low noise power supplies for time nuts circuitry

2011-11-24 Thread Kevin Rosenberg
78xx Regulators are quite noisy. You can use them to filter the noise of a cheap DC/DC converter, but i wouldnt use them feed high precision electronics. There are a lot better designs these days. Hi Attila, Would you mind recommending some low-noise regulators? Perhaps for both low and high

Re: [time-nuts] Low noise power supplies for time nuts circuitry

2011-11-24 Thread Kevin Rosenberg
On Nov 23, 2011, at 5:50 AM, Chuck Forsberg WA7KGX N2469R wrote: How sensitive are each of a Thunderbolt's 3 supplies to noise? This doesn't break down the sensitivities to noise, but Tom shows a range of TBolt output noise for different 3 voltage power supplies:

Re: [time-nuts] Clock Correction Algorithm

2011-11-24 Thread Kevin Rosenberg
On Nov 24, 2011, at 9:35 AM, Miguel Gonçalves wrote: The software way is probably the best idea as it would account for small differences in different oscillators. I have 3 Arduino boards and will make 3 time displays. For precision timing with a microcontroller, I've been using the 10 MHz

Re: [time-nuts] Clocking a PIC16F628A from a Rubidium Standard

2011-11-24 Thread Kevin Rosenberg
On Nov 24, 2011, at 7:50 AM, Attila Kinali wrote: Have a look at the PIC 16F628 data sheet, it will tell you the requirements for the clock input and there should be circuit for external clock signal listed. If it's not in the datasheet, it should be in an appnote. Usually, chips accept

Re: [time-nuts] Symmetricom TimeSource 2700

2011-11-24 Thread Kevin Rosenberg
On Nov 24, 2011, at 2:43 PM, Charles P. Steinmetz wrote: I just did this, and the TS2700 has been silent for 30 minutes (it has not had an Alarm or Event since its last power cycle, about 6 months ago, according to its log). I did not want to disturb it by creating an Alarm or Event.

Re: [time-nuts] Low noise power supplies for time nuts circuitry

2011-11-24 Thread Kevin Rosenberg
On Nov 24, 2011, at 4:46 PM, Bob Camp wrote: The Linear LT1764 is reasonably quiet / high current / low dropout. Don't count on getting all three at once. Thanks, Bob! Kevin ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Symmetricom TimeSource 2700

2011-11-22 Thread Kevin Rosenberg
On Nov 21, 2011, at 10:33 PM, Charles P. Steinmetz wrote: The TS2500 was a very similar unit that received its timing signals from GPS. I assume they were built on the same case, hence the spare chassis hole (and perhaps also some features in BTMon that are not used by the TS2700). I

Re: [time-nuts] Symmetricom 2700 Time Source

2011-11-21 Thread Kevin Rosenberg
On Nov 20, 2011, at 3:29 PM, Frederick Bray wrote: There appears to be a 1pps function. The test documentation that came with mine showed that step # 22 of the TS2700 PANEL TEST was a 1 PPS output test. As I recall from prior reading, there appears to be such an output on the PRS10. It

Re: [time-nuts] Symmetricom TimeSource 2700

2011-11-21 Thread Kevin Rosenberg
On Nov 21, 2011, at 4:13 PM, Charles P. Steinmetz wrote: The whole point of the TS2700 is to be a Stratum 1 time source. See the TS2700 manual at pp. 14 and 113. The TS2700 clearly sends TOD information -- pretty much every BTMon window contains a TOD display. Hi Charles, Thanks very much

Re: [time-nuts] Symmetricom 2700 Time Source

2011-11-20 Thread Kevin Rosenberg
On Nov 20, 2011, at 2:44 PM, Frederick Bray wrote: Looks like the time of day function is not implemented in the 2700. I hadn't been able to activate it, either. Even with a TOD feature, the unit would be much more useful to me if it had a PPS output. Perhaps there is one hidden within. Kevin

[time-nuts] Unused/Old stock PRS10's available via Timesource 2700

2011-11-10 Thread Kevin Rosenberg
Hello Time Nuts, I was interested in acquiring a second PRS10 Rb/OXCO oscillator. I purchased one of the Brand New Symmetricom Timesource 2700 from the popular auction site. From the time-nuts archive, there is a single message that the TS 2700 contain a PRS10 unit. The Timesource 2700 purchase

Re: [time-nuts] T-Bolt Companion

2011-11-06 Thread Kevin Rosenberg
On Nov 5, 2011, at 7:44 PM, Kevin Rosenberg wrote: Hi David, I got it, thanks! Heh, wrong reply address. Sorry! Kevin ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] T-Bolt Companion

2011-11-05 Thread Kevin Rosenberg
On Oct 27, 2011, at 10:09 AM, David C. Partridge wrote: Run, don't walk to: http://www.perdrix.co.uk/FrequencyDivider/index.html Hi David, I got it, thanks! Kevin ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] [Solved] Looking for multiple PPS timestamp loggi ng

2011-10-06 Thread Kevin Rosenberg
On Oct 6, 2011, at 3:21 AM, David J Taylor wrote: http://www.g4jnt.com/SerialLogger_ShortForm.pdf I couldn't find what sampling rates the device supported, but otherwise I'm keen to acquire one! Looks like a nice device. I do like continuous monitoring! From the datasheet: The interval

Re: [time-nuts] [Solved] Looking simple temperature logging

2011-10-06 Thread Kevin Rosenberg
Hi List, Thanks for all the suggestions on monitoring temperature at the location of the XO. A lot of fine ideas. I found a solution, not inexpensive, at the same time tvb recommended it to me. It can be placed near the XO, no construction needed, and continuously outputs data. Some of the USB

Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging

2011-10-05 Thread Kevin Rosenberg
On Oct 4, 2011, at 11:42 AM, Mark Sims wrote: Use an LM34 sensor, not the LM35. It has twice the resolution per volt since it outputs in degrees F, not degrees C. That's a good idea. That's one issue that I have with a 10-bit ADC common to many MCUs, is the low voltage of 0.20 to 0.28 mV

Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging

2011-10-05 Thread Kevin Rosenberg
Hi Chris, select is a great idea, but I think I'll be using cygwin which doesn't appear to have an emulation of select on Windows. Kevin On Oct 4, 2011, at 10:23 AM, Chris Albertson wrote: On Tue, Oct 4, 2011 at 3:36 AM, Hal Murray hmur...@megapathdsl.net wrote: The temperature swings won't

Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging

2011-10-05 Thread Kevin Rosenberg
things... -Original Message- From: Kevin Rosenberg ke...@rosenberg.net Sender: time-nuts-boun...@febo.com Date: Tue, 4 Oct 2011 09:03:56 To: Discussion of precise time and frequency measurementtime-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement

Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging

2011-10-05 Thread Kevin Rosenberg
Dataq a call and find out what options I have for simple, continuous ASCII logging output. Kevin On Oct 4, 2011, at 9:40 AM, Jim Lux wrote: On 10/4/11 8:03 AM, Kevin Rosenberg wrote: So, if you know of any simple ADC to UART firmwares available, that'd be great so he can just reference

Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging

2011-10-05 Thread Kevin Rosenberg
On Oct 4, 2011, at 10:16 AM, Tijd Dingen wrote: You mentioned wanting to use the parallel port under linux for pps purposes, right? Hi Fred, I consider it, but tvb's picPET's will work much better for the project. So if some parallel port programming is acceptable, then you can do the

Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging

2011-10-05 Thread Kevin Rosenberg
On Oct 4, 2011, at 9:10 AM, Bob Bownes wrote: If you need a simple/cheap pollable ADC, there is a Velleman kit available with USB. Can sample ADC, and a number of discrete inputs as well. And it can now be found on the wall at Radio Shack, strangely enough. Hi Bob, That's nice that it's

Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging

2011-10-05 Thread Kevin Rosenberg
On Oct 5, 2011, at 7:49 PM, Jim Lux wrote: There's also the Labjack product... http://www.labjack.com/ USB interface for events, ADC, etc. In the $100 range depending on the model. A few years ago when it first came out, it was a pain because it was Windows only, with limited protocol

Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging

2011-10-04 Thread Kevin Rosenberg
On Oct 4, 2011, at 4:36 AM, Hal Murray wrote: In California, the diurnal temperature swings are big enough to be useful. :) Here in New Mexico as well, useful or ruinous depending upon your application. Hence, I believe, your smiley face above ;) The swing would be much bigger outside,

Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging

2011-10-03 Thread Kevin Rosenberg
Thank you to everyone for their thought answers and insights, they gave me some great ideas. I was thinking about the parallel port polling idea, but then my son wanted to measure the relation between temperature and XO frequency, so we needed microsecond resolution. tvb came up with just the

Re: [time-nuts] [Solved] Looking for multiple PPS timestamp logging

2011-10-03 Thread Kevin Rosenberg
On Oct 3, 2011, at 12:59 PM, Hal Murray wrote: Why do you need microsecond resolution? A junk XO will drift ballpark of 1 PPM per C. That's 86 ms per day or 3.6 ms per hour. The temperature swings won't be large, just the usual diuneral indoor cycles. He wants to use compute much much of

[time-nuts] Looking for off-the-shelf device to timestamp multiple PPS inputs

2011-09-28 Thread Kevin Rosenberg
Hello esteemed time nuts, I'm looking for device with an external clock input as well as inputs for multiple PPS signals that outputs timestamped messages for each input pulse via RS232. The initial need will be for two PPS inputs. I've considered a number of options, but I wonder if there a more

Re: [time-nuts] Looking for off-the-shelf device to timestamp multiple PPS inputs

2011-09-28 Thread Kevin Rosenberg
On Sep 28, 2011, at 12:19 PM, Hal Murray wrote: What sort of accuracy and/or resolution do you want/need? Whoops, left out that critical piece of information! It's for my son's project, he'll be looking at deviations probably no shorter than one 1 sec, so milliseconds will be plenty for him.

Re: [time-nuts] Looking for off-the-shelf device to timestamp multiple PPS in...

2011-09-28 Thread Kevin Rosenberg
On Sep 28, 2011, at 12:34 PM, Chris Albertson wrote: There are much cheaper counters on eBay the HP5328 goes for $100 more or less. That's a nice price. I hadn't looked at that unit, just the PM8660/B (since I own one) and the 53230A (since I want one). I'll be glad to read the manual for the

Re: [time-nuts] Looking for off-the-shelf device to timestamp multiple PPS in...

2011-09-28 Thread Kevin Rosenberg
On Sep 28, 2011, at 12:21 PM, ewkeh...@aol.com wrote: look at the attached description of the 5 channel counter system that I use on my Dual Mixer it does what I call pseudo time stamp. Counters are always counting. Code and write up courtesy of Richard McCorkle. Thanks, Bert -- looks

Re: [time-nuts] Looking for off-the-shelf device to timestamp multiple PPS inputs

2011-09-28 Thread Kevin Rosenberg
On Sep 28, 2011, at 1:21 PM, Chris Albertson wrote: Milliseconds? So why are we talking about HP counters and PicTic and so on. A basic low end Linux system that is controlled by NTP and a GPS receiver is maybe about 100X better than your requirements. (I figure you are looking for about

Re: [time-nuts] Looking for off-the-shelf device to timestamp multiple PPS in...

2011-09-28 Thread Kevin Rosenberg
On Sep 28, 2011, at 1:05 PM, ewkeh...@aol.com wrote: It takes less than an hour to assemble I do one in twenty minutes, programming the PICs takes me the longest, because I am not good at it. Thanks for the time estimate, Bert. As long as we're building the opto-isolated, divide-by-120 ZCD,

Re: [time-nuts] Looking for off-the-shelf device to timestampmultiple PPS inputs

2011-09-28 Thread Kevin Rosenberg
running on a tired old PC. Sync the thing up with NTP or what ever to keep it stable long term. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Kevin Rosenberg Sent: Wednesday, September 28, 2011 3:56 PM To: Discussion

Re: [time-nuts] Looking for off-the-shelf device to timestampmultiple PPS inputs

2011-09-28 Thread Kevin Rosenberg
On Sep 28, 2011, at 5:46 PM, Chris Albertson wrote: Counters will not log the time of a pulse but they will continuously measure time intervals.And the interval might be time from the last tick ofthe second. So you 'd use the Rb's PPS to trigger the start channel and the device under

Re: [time-nuts] Distribution amp

2011-05-11 Thread Kevin Rosenberg
On May 11, 2011, at 8:25 AM, John Ackermann N8UR wrote: Yes, unfortunately the MAX477 line driver chip that we used in the TADD-1 has become unobtanium, and there's no drop-in replacement. I'm (very slowly) working on a new distribution amp that will replace the TADD-1 and have

[time-nuts] IEEE 1588 PTP transceiver chip announced by NatSemi

2011-04-05 Thread Kevin Rosenberg
For those interested, from http://www.national.com/pf/DP/DP83630.html The DP83630 Precision PHYTER® device delivers the highest level of precision clock synchronization for real time industrial connectivity based on the IEEE 1588 standard. The DP83630 has deterministic, low latency and allows

Re: [time-nuts] advice: frequency calibration to 1 ppm possible without GPSDO?

2011-02-18 Thread Kevin Rosenberg
On Feb 18, 2011, at 3:25 PM, Mike S wrote: I'd think one of these should work, for a buck plus shipping: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detailname=S9009E-05-ND I used one similar to that, soldered on the appropriate wires, then used some corona dope to insulate and

Re: [time-nuts] Thunderbolt Supply

2011-02-12 Thread Kevin Rosenberg
On Feb 11, 2011, at 9:44 PM, Neville Michie wrote: [...]For the minus 12v I used a ICL7662, these are rare, so a cmos gate oscillator and diode pump negative generator could be used. I am told the -12V is quite uncritical.[...] Thanks for the thoughts. I'm thinking about redoing the power

Re: [time-nuts] Thunderbolt Supply

2011-02-12 Thread Kevin Rosenberg
On Feb 12, 2011, at 3:12 PM, Bruce Griffiths wrote: Cuk switching regulator Thanks for the tip! Kevin ___ 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 Supply

2011-02-12 Thread Kevin Rosenberg
On Feb 12, 2011, at 8:16 PM, Mark J. Blair wrote: my setup eventually, when I feel a surge of time-nuttiness coming on. :) Even in its current configuration, it far exceeds my needs for a frequency reference. Exceeding your needs? Doesn't seen like that surge of time-nuttiness has hit yet

Re: [time-nuts] cheap antenna

2011-01-22 Thread Kevin Rosenberg
On Jan 21, 2011, at 4:52 PM, Jerry wrote: I would like to thank everyone on the list who helped me get through the problems with my 58503 and the suggestions that resulted in my [] getting a Trimble Tbolt which is now up and working. Someone a bit back was looking for a cheap antenna and

Re: [time-nuts] PYLT Python LabTools

2011-01-16 Thread Kevin Rosenberg
On Jan 16, 2011, at 3:00 AM, Poul-Henning Kamp wrote: I have created a Github project for the Python Labtools I'm using to deal with my instruments. Looks nice. While GUI tools like LabView have their role, I'm more often interested in remote monitoring and control. Probably the next thing

[time-nuts] PRS-10 / GPS PPS discipline program

2011-01-16 Thread Kevin Rosenberg
Hello, I was inspiring by PHK's post of his open-source GPIB monitoring system to mention that I'm working on remote monitoring and control of my newly acquired PRS-10. I've read the posts in the lists archive about how the discipline against a GPS external PPS is not optimal. I've been working

Re: [time-nuts] Achievable temperature stability for Thunderboltenvironment

2011-01-16 Thread Kevin Rosenberg
On Jan 16, 2011, at 9:00 PM, Mark Sims wrote: There is some info on implementing the temperature controller in the comments at the start of the file heather.cpp Hi Mark, Thanks very much for the information. I wasn't actually aware that Heather was open-source. That's great as I can read the

Re: [time-nuts] Yes, Virginia, $200 5370B's do happen

2011-01-06 Thread Kevin Rosenberg
On Jan 6, 2011, at 4:38 PM, Bob Bownes wrote: After the discussion a few weeks ago, I started looking for a 5370. In [...] Only a full checkout will tell, but so far, I'm pretty optimistic. Wow, Bob -- great story and great price. Nice pickup on finding photo evidence of the PS voltage switch

Re: [time-nuts] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC

2011-01-05 Thread Kevin Rosenberg
On Jan 5, 2011, at 1:15 AM, David J Taylor wrote: [...] The Garmin rep who wrote to me suggested that Garmin were unaware of the problem, but would investigate it. Could I urge you all to report this problem to Garmin, please, so that we have a greater chance of getting a fix in the next

Re: [time-nuts] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC

2011-01-05 Thread Kevin Rosenberg
On Jan 5, 2011, at 4:08 AM, Kiwi Geoff wrote: I have reverted quite a number of times now Kevin - trying to understand why the 18x can be 1 second slow. I have never had an issue putting in an older version into the 18x, the updater software does know what your doing, it says: Hi Geoff (of

Re: [time-nuts] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC

2011-01-04 Thread Kevin Rosenberg
to 3.20 on an 18x would be most specific to my situation. Thanks in advance! Kevin Rosenberg KR5F On Jan 4, 2011, at 9:29 PM, Joseph Gray wrote: Geoff, Thanks a lot for comparing firmwares. That hard information helps tremendously. Joe Gray W5JG On Tue, Jan 4, 2011 at 8:46 PM