Re: [time-nuts] Affordable PoE 6-digit time displays?
Maybe not exactly, but I use an app on an old Android cell phone as my UTC wall clock. Large characters in horizontal mode; NTP via WiFi. Sent from BlueMail On Jun 14, 2018, 20:15, at 20:15, David Andersen wrote: >I'd hoped that ebay or aliexpress would yield a bounty given how >seemingly >simple these are, but I'm drawing a blank (and finding a lot of $300+ >new >options). Anyone have a favorite source for either flat wall-mount or >rackmount displays that will pull from an NTP/SNTP/whatever server? > >(if wall-mount, PoE is optimal). Used good. Cheap good. Looks good >next >to my random collection of antiquated time measurement gear provides >amusement value but isn't really critical. :-) > >Thanks! > > -Dave >___ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Einstein Special on PBS
The mountain thing has been done. Someone needs to take their clock to the bottom of the deepest mine (2.4 miles). ___ 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] Racal Dana 1992 universal counter
I have used the Prologix USB GPIB device with mine. On 1/22/2015 6:14 AM, christophena...@virgilio.it wrote: Hello everybody, i am looking for an interface pc card for a Racal-Dana Model 1992 Nanosecond Universal Counter Timer 1.3 GHz.Please could someone give me some suggestions about a card that might suite this counter? I was told that a GIPB-USB interface controller should work (for instance ADLINK usb-3488A IEEE-488) but i'd like to be 100% sure.Has someone maybe direct experience with that? Thanks in advance and best regards, Chris Nacci ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Sun Outage
If you had an exact timing for the outage, would that have told you the beam-width of your antenna? -- project for next spring :-) On 10/9/2014 1:04 PM, Mike Feher wrote: Bob - I do not believe it has any effect. The DirecTV satellites are geostationary at about 22K miles. I used to experience the same phenomenon in the late 70's with my TVRO receiver at C band. GPS has some 36 or so satellites in a Medium Earth Orbit (MEO). Blockage, if it can even occur due to the nature of the receiving antenna, of a single one for a few minutes will have no discernible effect in my opinion. 73 - Mike Mike B. Feher, EOZ Inc. 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 office 908-902-3831 cell -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Thursday, October 09, 2014 1:40 PM To: Time Nuts Subject: [time-nuts] Sun Outage Two days this week, there was a 3 or 4 minute outage on DirecTV as the sun aligned with the satellite and my dish. So I was wondering what kind of effect this has on the GPS system and especially timing receivers. Bob - AE6RV ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts 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] Crude Survey Technique
Southward (toward equator) deflection would actually improve the geometry. All non-north vectors would be lengthened in proportion. On 11/21/2013 6:37 PM, Bill Beam wrote: On Thu, 21 Nov 2013 15:28:32 -0800, Chris Albertson wrote: If you need a very tall pole that is 100% vertical then hang a weighted rope from a tall support. Then go to the other end and watch the seconds tick down. Be carefull!... A plumb bob does not hang vertically (point to center of Earth). Since the suspension point is undergoing accelerated motion the bob will be deflected toword the equator. This problem also applies to bubble levels, etc. And there are other perturbations due to Sun, Moon, Jupiter, etc. which are not constant. Which leads to the question: How to make the pole vertical? Newtons laws are NOT valid in a noninertial frame. (That's why the Coriolis force was invented.) Thus the term rocket science. Bill Beam NL7F ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] systron donner 6153 corpse picking
I have a Systron Donner 6153 counter which has burnt out diodes on the fast channel. The display board has a big edge connector which looks like it accesses all of the nixie and power lines. I am going to disassemble to make a nixie clock. I may saw the display board in half in order to trim it down to only the parts I want. It doesn't seem like this counter would be of particular historical or technical interest. But I'm not likely to know that. Have not yet decided what to do with the other two nixies (8), was only planning to use 6 for the clock. If you have need for other boards or parts from this, let me know. Chris ___ 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] DIY GPS antenna...
There was a GPS antenna project in QST OCT 2006. (but I never built one) BTW: if you want to build your own GPS antenna, the easiest designs are ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] hp 05328-60018 board for free mostly
You all talking about putting oscillators into counters... I took the oscillator out of a derelict 5328A and used it in my GPSDO. I have the little adapter board, part # 05328-60018 which I will send to anyone who wants it and will pay the shipping. Chris w0ep ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] hp 05328-60018 board for free mostly
Item has been claimed. Chris Howard ch...@elfpen.com wrote: You all talking about putting oscillators into counters... I took the oscillator out of a derelict 5328A and used it in my GPSDO. I have the little adapter board, part # 05328-60018 which I will send to anyone who wants it and will pay the shipping. Chris w0ep ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP 10811 update
On 7/25/2013 8:32 PM, paul swed wrote: Well lucks not so good do have the voltage closer but as Bob C said. That ain't the issue. this may is a dumb question: Lower than expected frequency means some extra capacitance in parallel or not enough in series with the crystal... ? Would that put suspicion on C4 (0.1uF between crystal and Q1)? ___ 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] GPSDO - Does it work?
On 7/15/2013 10:09 AM, Bob Stewart wrote: In this case, I was using the 10MHz output from the GPSDO as the reference and measuring the 5MHz output from the GPSDO. So, even if the GPSDO is off in frequency, the relationship between the 10MHz reference and the 5MHz signal are mathematically fixed. It just seemed strange to me that under such a circumstance the final count would wander only in the minus direction. I expected either to see a solid 5.000, or to see it wandering between 4.999 and 5.001. Bob If it is counting events, that means it never rounds up. So half the time starting with a 4 and half the time starting with a 5 means that you are in the window between (5 + delta) and (5 - delta) for a very small delta. If all you ever saw was 5.000... then your little window is somewhere in between 5.000...0 and 5.000...1 Is that really where you want to be? 4.... is your friend. Chris w0ep ___ 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] GPDSO is working
Hi Bob. My configuration is: - HP 10811-60111 10 Mhz oscillator - Trimble Resolution-T GPS card - VE2ZAZ controller board - homebrew power supplies - RS232 switchable between GPS and VE2ZAZ controller - little e-bay puck GPS antenna on the top of an 8' post outside my window. I did get the software for the Resolution-T from the Trimble site and did a site survey. My software settings for the VE2ZAZ controller board are: S: 00E1 (a few seconds more than one hour) F: 01(for this osc the fine adj is not useful) L: B1 H: 10 W: c8 N: 0A O: 01 X: 02 M: 01 I've had the thing running for about a year. It took a while to figure out a bad solder joint in my oscillator that made the DAC voltage ineffective. Since it's been running right I have had the opportunity to compare it to a cesium standard and I'm happy. There is also a mailing list for the VE2ZAZ controller where you might find more info: http://mailman.qth.net/mailman/listinfo/gps_standard Chris w0ep On 7/12/2013 10:32 AM, Bob Stewart wrote: Hi Chris, Thanks for the feedback. Do you happen to know the parameters you have setup for yours? Just wondering what you are using for the F, M, and S parameters. What kind of receiver are you driving yours with, and do you have it in position hold mode? Bob From: Chris Howard ch...@elfpen.com To: Bob Stewart b...@evoria.net Sent: Friday, July 12, 2013 6:45 AM Subject: Re: [time-nuts] GPDSO is working On 7/11/2013 10:59 PM, Bob Stewart wrote: After ham-fistedly breaking a few things, I've finally got my GPSDO working. (does happy dance) Now that it's had some time to warm up I see that it's started wandering around +/- a couple of counts from sample to sample (16 seconds). Is this because the UT+ is not set to timing mode? Putting in an RS-232 (or USB) to TTL adapter, switchable between the UT+ and the VE2ZAZ board, is pretty much next on my schedule. I've got an adapter I made many years ago, but it's not suitable for mounting in the box, and there's no simple way to hook it up to the UT+ at the moment. Bob I think I recall you are using the VE2ZAZ board. Yes, the count each time goes up and down. I am using that board and mine goes up and down, roughly in the +/- 5 range. Chris w0ep ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Beaglebone NTP server
On 6/19/2013 1:52 PM, Gabs Ricalde wrote: Are you using the original BeagleBone or the new BeagleBone Black? Will you have any details available about what parts are needed to set it up? Thanks! Chris Howard ___ 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] New to list and GPSDO questions
I like that explanation. I think I get it. I don't think it is likely to cause me any worry. My actual measurement of ADEV on my VE2ZAZ device gave me a 100,000s sigma of just under 1E-10 and that works for me (best is at 1000s, 4E-11). Maybe the strength and the danger of the VE2ZAZ design is the wide range of integration settings. If I were to pick some very unfortunate settings, maybe it would degrade overall performance in the way you describe. Thanks for taking the time to explain it to me. Chris On 6/13/2013 10:15 PM, Richard H McCorkle wrote: Chis, Over time without phase correction the analogy would be more like zig to the right, correct to go straight, zig to the right, correct again, and keep repeating this sequence ad infinium as the source ages in predominantly one direction. Each time the phase shifts in the same direction and before long you are on a different road a full clock cycle to the right and continuing to shift in the same direction. The total number of clocks over the period has changed from the ideal even though the average frequency has been correct. So over the short-term the right number of cycles occur, but over the long term there is an increasing error from the ideal number of clock cycles as the period increases. If all you need is a frequency that is stable over short periods then the phase is of no concern. But when using a scope or TIC to compare a device under test (DUT) to the reference to determine its Adev over longer periods then you need the phase of the reference to be constant over the maximum measurement period (typically 4-5 days for a 1-day Adev value) to determine the DUT long-term drift. By keeping track of the total accumulated count from an arbitrary starting point (i.e. when the reference sample is taken) and adding 6800 HEX each update the reference count would represent the ideal count after X updates if no drift had occurred. Comparing the current count to this ideal gives the total change since the arbitrary reference was first stored. By adding steering to keep the actual sample count at the ideal value then over the long-term there would be no drift as it would be corrected out. The actual phase to GPS isn't the important factor - the change in the phase over long periods (like a day or week) is as it represents an error in the total number of counts over that period and a reduction in the long-term stability. Richard I'm with Bob in that I don't really understand this description. And what are we trying to be in phase with? the 1PPS? Is it possible to reproduce the actual phase of the clock in the GPS birds once it has been through my GPS and come out as 1PPS? I picture the EFC steering the car straight down the road. And you want to adjust not just the drift to the right but steer back to the center of the lane. I think I get that part. I don't get who is setting the lane and why I should care. Do the statistics (ADEV, etc.) show that this is an improvement? If I'm doing my slow zigzag down the center line or the right shoulder, again, do I care? Chris w0ep ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Fw: New to list and GPSDO questions
I'm with Bob in that I don't really understand this description. And what are we trying to be in phase with? the 1PPS? Is it possible to reproduce the actual phase of the clock in the GPS birds once it has been through my GPS and come out as 1PPS? I picture the EFC steering the car straight down the road. And you want to adjust not just the drift to the right but steer back to the center of the lane. I think I get that part. I don't get who is setting the lane and why I should care. Do the statistics (ADEV, etc.) show that this is an improvement? If I'm doing my slow zigzag down the center line or the right shoulder, again, do I care? Chris w0ep On 6/13/2013 5:51 PM, Richard H McCorkle wrote: Hi Bob, The VE2ZAZ controller is a frequency locked loop that keeps the source on frequency but over time the phase drifts, as past corrections are not compensated for. When the system is stable every 16 seconds the 16-bit counter rolls over 2441 times with an extra 26624 counts (6800 HEX). The previous count is subtracted from the current count, the difference from 6800 HEX is used to update the EFC to correct the frequency, and the current count is stored as the previous count for the next sample. When the current difference is not exactly 6800 HEX then a phase shift of 6.25ns has occurred over the sample period for each count of the difference from 6800 HEX. The EFC corrects the frequency to give the proper 6800 HEX over the following samples, but the phase shift from the previous error during the correction period remains. If you add a little code to provide a correction history you can add phase correction to the VE2ZAZ controller as well. Once lock is established store the sample count as a phase reference count. Add 6800 HEX to the reference count every update and store the result as the next reference value. Use the difference between the current and previous samples from 6800 HEX to coarse correct the frequency as currently done, but add the difference between the current count and reference count to the EFC correction as a fine phase correction. If hold or unlock occurs disable the phase correction routine until lock is re-established. Then store a new reference and restart the phase correction process. By updating the reference every update it provides a phase history so the accumulated count error over time can be removed and the phase of the source can be stabilized. Richard Atilla, Isn't the VE2ZAZ circuit functionally equivalent to your example 3? Granted, he's not picking the 10 millionth transition and checking its phase difference to the reference, but I've only got a 1PPS reference with a 1uS or so jitter from pulse to pulse. Bert is averaging over 16 seconds, and creating a PWM signal to drive an integrator (simulating a DAC), which will drive a Trimble 34310-T. And like I mentioned earlier, I just like the way Bert did it. It has a kind of elegance that appeals to my inner hacker. =) Bob - AE6RV - Original Message - From: Attila Kinali att...@kinali.ch To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency measurement time-nuts@febo.com Cc: Sent: Thursday, June 13, 2013 3:39 PM Subject: Re: [time-nuts] New to list and GPSDO questions snip [3] Describes how to use a clock synchronizer to build a GPSDO. Probably not the easiest and not the cheapest way, but definitly one with a very low parts count. snip [3] The AD9548 as a GPS Disciplined Stratum 2 Clock, by Gentile, 2009 http://www.analog.com/static/imported-files/application_notes/AN-1002.pdf ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts 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] Brooks Shera thanks options
The online obit at http://www.santafefuneraloption.com/sitemaker/sites/santaf0/obit.cgi?user=949646Shera says, Memorials may be made to the University of Chicago Laboratory Schools, the Sierra Club, or any organization of the Donor’s choice. University of Chicago Laboratory Schools http://www.ucls.uchicago.edu/ (look under 'Support Lab' for contribution links) Sierra Club http://www.sierraclub.org/ (big orange DONATE button) I don't see a PayPal option on either one. Chris W0EP On 4/15/2013 6:29 PM, Alan Melia wrote: Ok Bert I will stick my head above the parapet and repeat that query.Sometimes it is frustarting the get no response, but later get personal appreciation as you meet individuals. I didn't know the guy. I was trying with a friend to contact him long after the original article. We were disapointed but not unhappy. I certainly appreciate the help and expertise the Group provides..and it is nice to be able to say so, and salute the work Brooks did. Thanks and Best Wishes Alan Melia (G3NYK) - Original Message - From: ewkeh...@aol.com To: time-nuts@febo.com Sent: Monday, April 15, 2013 8:17 PM Subject: Re: [time-nuts] Brooks Shera ASM release Alan You may suggest something to time nuts, looking at the response I doubt it and ask my self why did three of us spend three weeks to fully check it out and fix some of the code. Will reflect future projects. Bert Kehren In a message dated 4/12/2013 8:39:40 P.M. Eastern Daylight Time, alan.me...@btinternet.com writes: Bert is there any way we can add our names to some expression of thanks to his widow Karen and her helpers for their work and maybe leave a remembrance of his worldwide friends for his family? Thanks for your efforts Best wishes Alan Melia (G3NYK) UK - Original Message - From: ewkeh...@aol.com To: time-nuts@febo.com Sent: Friday, April 12, 2013 8:52 PM Subject: [time-nuts] Brooks Shera ASM release The time-nuts server takes out all spaces so allow me to resend the acknowledgementsBert Kehren At this time I like to thank Brooks for all the work he did, his wife Karen Stoll for deciding to release HEX and ASM and Bob Leichner who implemented the software commands. Brooks did not have the chance to put final touches in and complete his work, so Richard McCorkle stepped in and made the final changes. For almost a decade Brooks and Richard collaborated on the GPSDO, which benefits all of us. Also major recognition has to go to Juerg Koegel an other time nut that put our other projects on hold to check every iteration. Attached is part of a test that clearly shows the performance of the Alpha filter. Limited by attachment size contact me off list for more data. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts 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] Releasing sources
My very-limited experience in releasing code was being very excited when I heard from someone that they had found a bug. That's the only communication I've ever received. It's hard to know whether to be happy (no bugs!) or sad (no users!). Chris Howard ___ 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] Found at a surplus store
Looks like an @ROAD iLM2700 http://www.smb.road.com/corp/shared/pdf/SpecSheet_iLm2700_25Oct06.pdf On 3/5/2013 9:57 AM, Pete Lancashire wrote: I did not get any, I will see if any are still there and get them, once I do I'll let the list know how many etc. and send what there is out at cost, hopefully will fit in the USPS small flat rate box. -pete On Mon, Mar 4, 2013 at 8:52 PM, Pete Lancashire p...@petelancashire.com wrote: https://plus.google.com/u/0/photos/111617808980322733757/albums/5851716840178315361 $5 each worth the $5 ? -pete ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] cesium for sale - you know where
I've decided to list my FTS-4060 on ebay, item# 151004036331 No reserve, 10 days. Notices tacked on the local telephone poles just have not resulted in much interest. Chris ___ 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] GPIB counter logging / plotting software?
I have the USB/GPIB Prologix thingy also. My Racal 1992 on talk mode just sends the readings down the wire. I can collect them with regular serial port work on the PC side. I don't really understand GPIB or talk mode. But the readings show up on my serial port. Chris On 2/25/2013 10:44 AM, Chuck Forsberg WA7KGX N2469R wrote: The most expensive part of the setup is the interface card between the PC and GPIB. Next you will need GPIB cables. A free GPIB package is available for 32 bit Linux. I use it to talk to my Racal-Dana 1992, spectrum analyzers, selective voltmeter, and signal generator. You have to write the high level stuff. On 02/25/2013 07:39 AM, Dan Rae wrote: I am working on 400 - 500 MHz DDS clocks for an amateur radio project and would like to record over gpib and plot the relative frequency drifts over time of different versions of the oscillator from a cold start. I have Racal 1992 and -hp- 5345 counters available, themselves driven from gps. I have the prologix USB thingy. Does anyone know of any software that will enable me to do this, without spending lots of money? Dan ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] GPSDO - 8 days of data (and FTS-4060 for sale)
I produced some TimeLab charts from my 8 days of GPSDO (VE2ZAZ) data and put them on my blog page at http://w0ep.us/OM/ Would love to hear any comments you all have. My goal was to confirm that the thing is working right and that the standard deviation calculation which comes from VE2ZAZ's Windows monitoring program was a good handle on general health and accuracy. I'm not into it enough to know the fine benefits of the various measuring possibilities. My intent was just to be able to say something like 10 MHz +/- X Hertz. I am very happy with a number like X=.003 Having done this, I would like to sell the FTS-4060 and use the money to buy a better HF radio, and get back to the part of my hobby activities I enjoy more. No offense, but time-nuts stuff sure takes a long time. Chris Howard W0EP Columbus, Mississippi ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] systron 6153 troubleshooting
Any advice on troubleshooting the D channel of a Systron 6153 counter? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] measuring my GPSDO : length of TimeLab run?
I took my recently acquired cesium clock to the hamfest in Jackson, MS a couple of weeks ago in the hope that I could cash in big and retire in splendor. But no one bought it. So, instead I spent some of my hamfest earnings on a GPIB/USB dongle and I've been using TimeLab and looking at the VE2ZAZ GPSDO that got me into all of this in the first place. The numbers I get are very gratifying. The GPSDO seems to work better than I expected. This is really cool. But I have a question. The GPSDO is set up to do a potential correction every hour. It seems to me that a TimeLab run of less than X hours will only be measuring the fine properties of the oscillator and not the whole system. The question is, how many hours of data collection are needed to capture a characterization of the GPSDO as a whole? What do people to with Thunderbolts and other similar systems? Chris Howard w0ep After I get done playing around with this cesium standard I still think I would like to sell it. I would like to get enough out of it to buy an Elecraft K2 with some of the options. I don't really know if that is realistic. If anyone has comments on that plan, would also love to hear them. ___ 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] Interval Timer Recommendation
On 1/12/2013 7:40 AM, Magnus Danielson wrote: At 250 ps you use interpolators. The typical coarse counter would be 100 MHz and that means 10 ns in raw resolution, but you would then use an interpolator to get higher resolution. By getting a start and stop measure, roughly tau time inbetween each other you get f = (t_stop - t_start)/tau assuming t_start and t_stop trigger from the same source. This may not be of interest, and if so, I'll drop it. But I was thinking that if they go to some kind of fallback interpolation the time interval measurements at a more-or-less fixed frequency might still be pretty good. (I think along these lines because maybe someday a battery-bad unit might show up which is not so good at umpty-GHz measurements but still OK for TIC) If it had a systematic error at 10MHz it seems like maybe that would just fall out in the wash. (?) Chris ___ 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] Interval Timer Recommendation
The manual states that loosing the settings on a 6680 is no big problem , but on the 6681 you loose the interpolator calibtation. And it sounds like that's not a good thing. I didn't know you had to watch out for Battery on a PM6680/81. CFO - Tnut-Beginner Denmark Would loss of interpolation calibration have much impact on its use as a TIC? ___ 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] GPSDO compare FTS-4060
On 12/29/2012 8:28 PM, Adrian wrote: Chris, patience is the key to successfully trimming your Cs unit. You will really want to compare it to your GPS for a week or so. You might be surprised about your findings. Actually, you're in need of a third high performance source... how else can you tell which of the two is more stable? Yep, use TimeLab and a TI counter! Regards, Adrian Yes, surprised already. this morning the comparison between GPS and Cs shows the GPS lagging (going the other way), with about 14 minutes for a full-cycle-declination. I won't be changing the Cs trimming any time soon. I can see how TimeLab would be very nice. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] GPSDO compare FTS-4060
Today I arrived home from a trip to Cleveland to pick up my FTS-4060 Cesium standard. About 45 minutes after power-up the lock light came on. This is unit S/N 1253. I think the only option it has is the 1 MHz/100 kHz output. I connected both my GPSDO and this thing to my O-scope and can see that the GPSDO is slightly faster. With the scope triggering on the 4060, it takes right at 8 minutes for the GPSDO to advance by one full cycle. Reading on list archives, it seems to me that the 4060 needs to be tweaked to match the GPSDO. I have printed out the manual for the 4060 and I will read about that and see what I can figure out. I also think I will measure the one-cycle-advance time period over the course of the next few days and see if it changes much. Chris w0ep Columbus, MS ___ 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] GPSDO compare FTS-4060
On 12/29/2012 7:17 PM, Magnus Danielson wrote: I would recommend to use a TIC and TimeLab to assist you on that task. It is recommended to look at the phase plot (P), frequency plot (F) and modified Allan deviation plot (M) every once in a while. A benefit is naturally that you can share the measurements in a suitable form for others to toy with and provide comments to you. Cheers, Magnus Yes, this is how poor innocent people like me are drawn into the world of being a time nut! I have a Racal 1992 counter but have avoided the computer interface issues so far. sigh But that would be really cool. Chris ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] any time nuts in Cleveland ?
Surplus FTC-4060 which needs collecting in the next 10 days. ch...@elfpen.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] any time nuts in Cleveland ?
On 12/20/2012 11:48 AM, Bill Dailey wrote: fts or ftc FTS-4060 (you're right) ___ 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] any time nuts in Cleveland ?
On 12/20/2012 11:35 AM, Chris Howard wrote: Surplus FTC-4060 which needs collecting in the next 10 days. Sorry, this is causing more trouble than I was expecting. I will be more clear. I bought a surplus FTS-4060. The thing sits in Cleveland and I have 10 days to secure it. I'm looking for any local person who might like to take possession until I can come and collect in a more leisurely manner. Contact me directly if interested. ___ 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] Strange DCF77 master clock data
If it were me, I'd suspect that my window of bits is off to the left or right by one bit. The old first bit is called zero problem. And the relationship between 7- 3 and 5- 1 makes me wonder. Chris On 12/10/2012 5:00 AM, Tom Harris wrote: I am logging the data from this strange master clock, and the none of the bits 42 through 44 are stuck. Good idea, though. I have just checked tonight, and the DOW is indicating as 5 (Friday), despite it only being Monday. Good idea though. On 9 December 2012 23:24, mike cook mc235...@gmail.com wrote: Le 09/12/2012 11:28, Tom Harris a écrit : Greetings Time Nuts. Time related, but unusually so: I am examining the DCF77 (see http://en.wikipedia.org/wiki/**DCF77http://en.wikipedia.org/wiki/DCF77for a refresher) data output from a master clock intended to drive a series of slave clocks operated from 24V DC, interrupted by 100ms or 200ms pulses to signal '0' '1' on the data. What I am seeing is that the day of week bits 42 through 44 inclusive do not code the day correctly, they seems to have a variable offset from the actual day, I have seen an offset from +1 to +3. The rest of the data, ncluding parity bits, are OK. Today, 9/12/2012, the day is Sunday, which should be coded as '7'. However I am seeing a value of '3', which is Wednesday. Is this normal, do wired DCF77 slave clocks transmit munged dow data to prevent them being used with someone else's master clock? If they do I am hosed since I am trying to reverse engineer the master clock. Is it just bit 44 being stuck on zero? or can each dow get varying values? -- Les chiens aboient, et la caravane passe. __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Thanks to all
I just want to say thanks to all who participate on this list. You guys are way above my batting average and I learn a lot just by hanging around. Thanks for being patient with newbies and dummies. p.s. my GPSDO (the VE2ZAZ design and board) is running great thanks to advice from you all. ___ 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] getting a grip on 10811 drift (maybe fixed)
It's been running a few days now and everything looks good. I usually fail on the side of optimism, but hope things continue. Thanks very much to the group for patience and support. Chris Howard ___ 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] getting a grip on 10811 drift (trying to read my instruments)
The picture, if attached, did not come through. Probably it was stripped off by the mailing list software. I did located what I believe you were speaking of. A small white donut placed in the circuit board which was an attachment point for the trimmer and a smaller fixed capacitor and the blue wire going to the crystal. Mine looked ok but maybe a bit dry compared to two other such fixtures on the middle board. So I touched it up with more solder on both sides. I also touched up the other end of the small fixed capacitor. I have the oscillator running and so far it seems happier. It warmed up faster, the trimmer adjustment seems more sure-footed. On 11/17/2012 12:02 AM, Neville Michie wrote: I have found a pic of the dry joint, this one was just a dry joint with resin insulating the connection, the other never had any solder applied. cheers, Neville Michie ___ 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] getting a grip on 10811 drift (trying to read my instruments)
Maybe that is my problem. I definitely have a problem. I am able to get the EFC to work on some occasions. Usually it will work if I run the trimmer all the way out and toggle the power. I can then adjust the trimmer and get things working. But if I give the box a rap the frequency jumps and I get into the mode of the EFC not working. I can trimmer it up and it will look fine but no EFC. I will check out that ferule thing. I'm not sure what you are describing but will look for it. Chris On 11/16/2012 5:53 PM, Neville Michie wrote: I have had two 10811 with EFC problems that turned out to be lack of soldering of one internal joint. This is a large PTFE ferule with several leads including the varactor and trimmer going into it. For many years the leads all contacted but finally one lead developed an oxide film. A soldering iron fixed them very quickly. The serial numbers were widely separated, so it was not an unlucky batch problem. cheers, Neville Michie ___ 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] getting a grip on 10811 drift (trying to read my instruments)
You all were right, my targeting of the 50 ohm resistor across the oscillator output does not seem to have solved the problem. A good thing to do, probably, but not the answer. While I was all excited about the resistor change I also mapped out the control voltage (EFC) vs frequency change. I wrote it out but didn't pay much attention. Now I've been pondering over that a bit. My next theory is that my EFC maybe isn't really doing very much. First I need to know if I am reading this right. My frequency counter is a Racal 1992 It reads 9.9997^6 as I write. A total of 9 digits with a smaller 6 to the right. If I read this correctly, I'm looking at 9,999,999.97 Hz ? If so, then I've got an EFC problem. My EFC mapping looks like this (this was done before I adjusted the coarse control) -4.94 VDC 9,999,999.95 -3.70 9,999,999.95 -1.24 9.999.999.93 0 VDC9,999,999.93 +1.21 9,999,999.92 +2.44 9,999,999.92 +3.67 9,999,999.91 +4.90 VDC 9,999,999.90 It doesn't look to me like I am getting anything like 1/2 hertz range using the EFC. If that's the case than my controller card is frantically steering but not getting the desired result. Or, if I'm reading it wrong, maybe that last digit is 0-5 meaning 1/2 a hertz and I am all wet (again). This particular oscillator came out of an old HP counter and I believe the EFC was wired to ground. So maybe the thing has never been exercised. Are there versions of the 10811 that don't have EFC guts inside? Hope I'm not boring you all to death. Chris w0ep On 11/9/2012 11:26 PM, WarrenS wrote: Chris HP 10811 can't drift that much that fast unless something is near broken, or being connected wrong like gnds or PS voltage. Check the operation of the oven. ___ 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] getting a grip on 10811 drift (trying to read my instruments)
On 11/15/2012 3:49 PM, Charles P. Steinmetz wrote: .90 VDC 9,999,999.90 How and where are you measuring the EFC voltage? Are you sure the voltage on the EFC pin of the 10811 (Pin 6) was the same as you measured? Was the EFC return pin (Pin 5) connected to the oscillator supply return (Pin 4)? If it is left floating, the EFC will not work properly. I was measuring with a cheap digital multimeter between pins 5 and 6. According to the documentation I have, pins 2, 4, and 5 are all tied together internally and pin 2 is connected to ground on my controller card (and the controller card is grounded to the case via both power supply wires and mounting hardware) I can send commands to the controller card and run the voltage up and down as expected. But those are good questions. I should test again with a test harness and different power supply when I get the oscillator out of the device. ___ 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] getting a grip on 10811 drift (beginner-ishquestion)
My perpetually drifting 10811 pretty quickly made it to the negative voltage rail on the control voltage. I was looking at the oscillator output with an O-scope and it looked pretty nasty. My equipment is not so hot, so I first chalked that up to bad probes. But I did some google work on that and found an old time-nuts message thread about the 10811 looking bad if the output impedance is bad. The VE2ZAZ board has provision for a 50 ohm resistor on the oscillator output. I have one on the board but it is a little-bitty thing, maybe 1/8th of a watt? Something I probably got from the guts of a VCR or whatnot. Hmm. So I put in a 1/4 watt 50 ohm resistor (like the parts list called for). My working hypothesis is that the small resistor was changing impedance due to heat. I have reset the control voltage to center value and got the coarse trimmer all beautifully centered. It's been running for about a day and I am hopeful that I've made a difference. So far so good. While I was interrupting the flow of 10 Mhz, I also mapped out the control voltage and corresponding digital control value and an approximate frequency. You EE guys are probably snickering and will want to tear the epaulettes off my time-nuts coat and break my sword. What can I say. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] getting a grip on 10811 drift (beginner-ish question)
I built a GPSDO using my own power supply, a VE2ZAZ board, a Trimble Resolution T GPS and a surplus HP 10811 oscillator. I'm having a bit of trouble with it. I have it set up and it locks ok and stays in lock so far. But the recommended long-term integration setting is not working for me. I think it is about 3 hours. At the end of every cycle it does a control voltage adjustment, always in one direction. If I understand it right, the oscillator is slowing and needs an incremental bump downward of control voltage every time. That seems like it is more than just long term drift. But I don't have my head around the quantities I'm looking at. I can measure the control voltage change over time. Can I convert that into a frequency drift? Or do I need to stop the voltage adjustments and allow the drift to occur then do a measurement of that directly somehow? Is this type of behavior an indication of dire problems with my 10811 oscillator? Chris Howard w0ep ___ 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] getting a grip on 10811 drift (beginner-ish question)
On 11/5/2012 3:16 PM, Richard H McCorkle wrote: The EFC specs on a 10811 are a frequency change of 1 Hz over a –5v to +5v EFC span or a sensitivity of roughly 1e-8 per volt (varies widely up to about 3e-8 / volt on some units) so you can get a ballpark idea of the age rate by looking at the EFC voltage change over 24-hour periods. I have been running it continuously for quite a while. I fired it up from cold start early this year and have had it running almost continuously, just a few power cycles in that time. Over the period of three weeks ending today the control voltage has move approximately 1 volt. That fits within your 0.05 volts per day. Thanks to everyone. Lots of interesting and helpful information. Chris Howard ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] antenna restrictions
I don't see what the problem is with HOA's and antenna restrictions. I just put a mag-mount antenna on the car that's up on blocks in the driveway. ( a bit of Mississippi humor for your Friday afternoon :-) ) peace! Chris Columbus, MS ___ 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] Trimble Resolution T
Yes, I have done so. You need a level converter. And the DSPMon software from the trimble web site is very informative. The Resolution T manual is also available on that web site. Chris On 8/6/2012 11:57 AM, Miguel Barbosa Gonçalves wrote: Hi! I'm looking at the Resolution T from Trimble (http://www.trimble.com/timing/resolution-t.aspx). Does anyone here connected it successfully to a computer? Are the voltages compatible with RS232 or do I need some converter? Thanks! Regards, Miguel ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Trimble Resolution T
From the URL you had given, just find the Support tab and you will have the manual and the software. On 8/6/2012 2:00 PM, Chris Howard wrote: Yes, I have done so. You need a level converter. And the DSPMon software from the trimble web site is very informative. The Resolution T manual is also available on that web site. Chris On 8/6/2012 11:57 AM, Miguel Barbosa Gonçalves wrote: Hi! I'm looking at the Resolution T from Trimble (http://www.trimble.com/timing/resolution-t.aspx). Does anyone here connected it successfully to a computer? Are the voltages compatible with RS232 or do I need some converter? Thanks! Regards, Miguel ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts 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] Pinouts for a Trimble Resolution T Timing GPS module 12ns 1pps
On 5/17/2012 2:24 AM, Ken Kubick wrote: Does anyone have or know where I can find the pinouts for a Trimble Resolution T Timing GPS module 12ns 1pps? Thankyou I have a Resolution T User Guide PDF file which has that info. I found it on the Trimble web site. If you cannot find it, I can send it to you. Chris ___ 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] Pinouts for a Trimble Resolution T Timing GPS module 12ns 1pps
On 5/17/2012 2:24 AM, Ken Kubick wrote: Does anyone have or know where I can find the pinouts for a Trimble Resolution T Timing GPS module 12ns 1pps? Thankyou I have a Resolution T User Guide PDF file which has that info. I found it on the Trimble web site. If you cannot find it, I can send it to you. Chris ___ 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] Pretty ADEV/Tau plots
These pretty ADEV/Tau plots, do people have an automated system to produce these things? How much work is involved? How many samples are taken? Sample for a month, omputer crunching for weeks? I have no feel for what the process is like. I have two oscillators and a Racal 1992 counter. If I were to hook up the computer to the counter would I have the minimum amount of stuff needed? ___ 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] Looking for a Counter - msg for Chuck
On 10/8/2011 10:43 AM, Roy Phillips wrote: Chuck If you failed to get the Racal - don't worry, the HP is a better product without all that aggravation that comes with doubts about the front panel buttons that frequently fail, and the symbols that wear off. The HP 5334A or B are a better bet, and the 5445A even better, if you can accept the additional size and fan noise. I intend replacing the fan in my 5335A with a 12 volt substitute. Its just the hassle of finding a 12 volt 300mA ? source within the instrument. Good luck Roy Chuck, I have been unable to reply to the email you sent to me regarding a counter. I have tried three separate email accounts through two different internet providers. All say they are unable to deliver to your address. Chris w0ep ___ 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] Fast than light neutrino
On 9/23/2011 3:23 PM, Brooke Clarke wrote: Hi again: What is the speed of light in rock? Outside of a cave the answer is C. Inside a cave, it's too dark to read my watch. (With apologies to Grocho Marx) ___ 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] seeking a time/clock software architecture
Seems like a lot of unknowns. You would have to have sensors monitoring the sensors. Do you lose too much by just maintaining a lifetime worst-case number, or maybe some kind of probability function? On 9/23/2011 3:45 PM, Poul-Henning Kamp wrote: And then it gets nasty: Vehicle Thermal balance model a function of: Vehicle configuation Vehicle orientation Nearby objects (sun, planets, moon) Wavelength Clock model: a function of: vehicle temperature, bus voltage gravity magnetic fields from craft vibration (micrometeorites, think: Hipparcos) clock age random clock internal events ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] GPSDO - internal connections question
I'm building a GPSDO using the VE2ZAZ board, an HP 10811 oscillator and a Trimble Resolution T GPS. My goal is a simple and cheap 10 Mhz standard for my little home electronics bench and ham shack. I have my power supply parts finally gathered up, now I have these boards that need interconnecting. I'm thinking I need to use coax cable for anything that has 10 Mhz on it. Do I need to shield the control voltage going to the oscillator ___ 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] GPSDO - internal connections question
On 9/21/2011 4:08 PM, Bob Camp wrote: Hi Twisted pair is fine for the EFC. Shielded twisted pair (one end grounded on the shield) might be slightly better). A lot depends on how many yards long the EFC wire is :) Bob Thanks! Would it do any good to have the control board, GPS, or anything else within its own shielded box? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Lightsquared, time-nuts and the press
I just had a phone conversation with someone who said she was a reporter for the NY Post about the comment I put in at the FCC regarding the Lightsquared report. I told her I heard about the issue at time-nuts. Chris ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Loran C generator - FAA Atlantic City.
FAA has some stuff for sale in Atlantic City, NJ on the GSA auction website, including a Loran-C generator which is still at 0 bids and $10. Just FYI. ___ 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] Mains as time-reference
http://www.nationalgrid.com/uk/Electricity/Data/Realtime/Frequency/Freq60.htm There's a beautiful screensaver available at http://gridwise.pnl.gov/technologies/ which shows the US WECC ( or so it seems ). Chris ___ 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] Mains as time-reference
On 12/30/2010 4:58 PM, Anthony G. Atkielski wrote: There's a beautiful screensaver available at http://gridwise.pnl.gov/technologies/ which shows the US WECC ( or so it seems ). I tried running the monitor program (not the screen saver), and it says that I have no Internet connection available. A sniff of the network indicates that it is doing no network I/O, although it remains in the system until I kill it. -- Anthony I tried the monitor but it complained that I didn't have some .dll file. The screensaver does work for me. The help file for the screensaver says that a live internet connection is required. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] 10811 EFC load question
What is the current requirement for the 10811 EFC +/- 5Vdc ? Is there any advantage to having it served by batteries? Chris w0ep ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] hammarlund TM700-A document
found in an old pile of stuff: Hammarlund TM700-A Secondary Frequency Standard Operating Instructions 7 pages and a cover letter. Free, if anyone wants it. ___ 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] Timing Distribution in Mountainous Terrain
1) Your own LORAN? 2) MASERS! ___ 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] Timing Distribution in Mountainous Terrain
Radar calibration: You could do a clock calibration if you knew some fixed reference points to sweep. Put some towers up on a few of the taller peaks in the area. Measure them while the GPS is running and use them for reference to keep the clocks right when GPS is down. But masers sound like more fun. -- Chris ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Fwd: Re: homebrew H maser
Given the quality of vacuum the manual seems to imply, I'm guessing this wont cut it. I'll bet that even low impurity Teflon has a long bakeout period. Too bad they don't have some kind of getter to allow lower vacuum specs. I expect they thought of that. The thing does sound like a giant hydrogenated vacuum tube. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] radioactive decay rates change?
http://news.stanford.edu/news/2010/august/sun-082310.html It's a mystery that presented itself unexpectedly: The radioactive decay of some elements sitting quietly in laboratories on Earth seemed to be influenced by activities inside the sun, 93 million miles away. Any implication for CS clocks? -- Chris w0ep ___ 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.
