http://permalink.gmane.org/gmane.comp.time.nuts hourly 1 1901-01-01T00:00+00:00 http://gmane.org/img/gmane-25t.png http://gmane.org http://permalink.gmane.org/gmane.comp.time.nuts/20766 <pre>Also make sure your batteries are not dead on the CPUs as I recall mine was replaced it. On Fri, May 25, 2012 at 11:08 PM, paul swed &lt;paulswedb-Re5JQEeQqe8AvxtiuMwx3w&lt; at &gt;public.gmane.org&gt; wrote: </pre> paul swed 2012-05-26T03:09:27 http://permalink.gmane.org/gmane.comp.time.nuts/20765 <pre>yes you have to get the week right thats why the calculator is useful. Also set the time. May fire the 2201 up tomorrow and can email you the week On Fri, May 25, 2012 at 8:59 PM, Tom Knox &lt;actast-PkbjNfxxIARBDgjK7y7TUQ&lt; at &gt;public.gmane.org&gt; wrote: </pre> paul swed 2012-05-26T03:08:49 http://permalink.gmane.org/gmane.comp.time.nuts/20764 <pre> Hi Paul; First, I received the Austron Antenna and it works. So you are saying that I should setback 1024 weeks to July 16 1992 and the rec will recognize the almanac?. Now July 17th? Thanks; Thomas Knox Ascent Concepts and Technology 4475 Whitney Place Boulder Colorado 80305 1-303-554-0307 </pre> Tom Knox 2012-05-26T00:59:27 http://permalink.gmane.org/gmane.comp.time.nuts/20763 <pre>I chased the TRU-50 down with Vectron. It's not a stock part, horribly expensive, special order, and has been obsoleted (ain't American English grand?). They would let me buy 10 of some that were on the shelf for the 100 price of $59.00 each. A Schmartboard, TI (formerly National) PLL, and a common vcxo is probably a much better way to go for diddling around. Don </pre> Don Latham 2012-05-25T22:38:26 http://permalink.gmane.org/gmane.comp.time.nuts/20762 <pre> I got in a couple of Resolution-T receivers from fluke.l and have had a chance to compare them with the Resolution SMT: The -SMT receivers appear to be new. Mine were the TEP variant (Motorola compatible) that has to be reconfigured to be TSIP compatible. The -T receivers are used. Mine came with locations in rural China stored in their survey position. The -T serial port comes set for 9600,8,Odd,1 (Tbolts are 9600,8,N,1) The receivers are physically and electrically compatible. They are mostly software compatible. The -SMT only works at fixed locations. The -T can work in mobile applications or as a general purpose GPS receiver. The -T is a 12 channel receiver and the -SMT is 14 channel. The -SMT is 6-8 dB more sensitive. The -SMT tracks and reports info on all sats that it sees (even if below the elevation and signal level masks). The -T only tracks and reports info on the sats above the masks. The -T has a +/-20 ns PPS, the -SMT has a +/- 14 ns PPS. Both support external sawtooth cor</pre> Mark Sims 2012-05-25T21:02:18 http://permalink.gmane.org/gmane.comp.time.nuts/20761 <pre>Yepper Simply set the date back by rollover time there is a gps date converter online that I use to figure it out http://csrc.ucsd.edu/scripts/convertDate.cgi?time=1992+07+16 Regards Paul WB8TSL On Fri, May 25, 2012 at 1:32 PM, Tom Knox &lt;actast-PkbjNfxxIARBDgjK7y7TUQ&lt; at &gt;public.gmane.org&gt; wrote: </pre> paul swed 2012-05-25T19:54:57 http://permalink.gmane.org/gmane.comp.time.nuts/20760 <pre> Hi; I have finally found a 70MHz IF GPS ant only to find the Austron 2201 is not Y2K complaint. Has anyone found a solution for this problem? I have looked at past threads and come up short, but thought I saw this problem addressed in the past. Thanks; Thomas Knox </pre> Tom Knox 2012-05-25T17:32:58 http://permalink.gmane.org/gmane.comp.time.nuts/20759 <pre>---------------------------- Original Message ---------------------------- Subject: WWVB test notification From: "John Lowe" &lt;lowe-PlFwYbz7hoJHf7+it3YNdA&lt; at &gt;public.gmane.org&gt; Date: Thu, May 24, 2012 4:22 pm To: "Lowe, John P" &lt;john.lowe-R3+/ord2DXQ&lt; at &gt;public.gmane.org&gt; -------------------------------------------------------------------------- *Notice* NIST Radio Station WWVB will be conducting a test of a phase-modulated broadcast format beginning at 1800 UTC (12:00 noon MDT) Tuesday, May 29 to 1800 UTC on Wednesday, May 30 2012. The normal broadcast format will then be restored for a two-hour period. The test will then resume at 2000 UTC (2:00 PM MDT) and end at 1800 UTC, Thursday, May 31 2012. Radio-controlled clocks and watches will not be affected. Phase-locking 60 kHz timing and frequency standard receivers may lose lock during the test. For more information, call WWVB broadcast manager John Lowe at 303-497-5453, or email john.lowe-R3+/ord2DXQ&lt; at &gt;public.gmane.org &lt;mailto:john.lowe-R3+/ord2D</pre> J. Forster 2012-05-24T23:20:43 http://permalink.gmane.org/gmane.comp.time.nuts/20758 <pre>As a FYI, the 6 port card I use is based on the4 Netmos NM9845CV. There are a few vendors peddling serial cards using this chipset and part number. Mine is from "Best Connectivity" (SD-PIO9845-6S). The card is windows and linux capable. </pre> gary 2012-05-24T04:40:38 http://permalink.gmane.org/gmane.comp.time.nuts/20757 <pre>Hi Ok, at least now we are down to some numbers. Ever taken a look at NTP on a Windows box running serial? It's not anywhere near a microsecond…. Bob On May 23, 2012, at 6:47 PM, Chris Albertson wrote: </pre> Bob Camp 2012-05-24T00:35:55 http://permalink.gmane.org/gmane.comp.time.nuts/20756 <pre> Yes, 200 ms would be insanely poor. NTP with a direct connected GPS can run the micro second level. The 100x to 1000x worse I'm talking about puts NTP at the 0.5 to 1.0 ms level. With PPS connected directly to the DCD line on a Linux based server the hardware counter is captured with a typical error of 1 micro second. Over the LAN or USB we see this error at about 1 or 2 milliseconds So what I'm saying is by using the LAN you give up micro seconds for milliseconds or about a factor of 1000. You are right. It is never anything at all like 200 ms. We get better than 200 ms error over the Internet from servers 1,000 miles away. In general you should expect a 1 uSec level error from a direct connect to from a GPS's PPS to the DCD line of a serial port and a mSec level error from USB or LAN and tens of ms error from an Internet connection. Where NTP really shines is extracting 10ms level timing from an unreliable connection that has much longer then 10ms delay. It really is not so impressive </pre> Chris Albertson 2012-05-23T22:47:02 http://permalink.gmane.org/gmane.comp.time.nuts/20755 <pre>Hi Ok, to be 1000: 1, you would take the 0.2 to 0.5 ms that you see on the LAN and take it up to 200 to 500ms. That's *way* worse than anything I have ever seen for a serial server over a LAN. Bob On May 23, 2012, at 5:15 PM, Chris Albertson wrote: </pre> Bob Camp 2012-05-23T21:59:57 http://permalink.gmane.org/gmane.comp.time.nuts/20754 <pre> Have you actually tried this and measured? 2:1 is very optimistic. Typically it is 1000:1 or worse But you are right that it may not matter. For most uses if the computer's clock is correct at the 0.1 second level they are happy. but this is a "time nut" mailing list and some of us like to get NTP to run at the uSecond level. Useless as that might be. Chris Albertson Redondo Beach, California </pre> Chris Albertson 2012-05-23T21:15:49 http://permalink.gmane.org/gmane.comp.time.nuts/20753 <pre>Hi What ever degradation the serial stream sees on the LAN, the resulting NTP output will see once it's on the same LAN. It's unlikely you will see more than a 2:1 net degradation no matter what is going on. The flywheel in the NTP algorithm will likely help you in this case to actually improve things a bit. Bob -----Original Message----- From: time-nuts-bounces-JSkTLETqlTM&lt; at &gt;public.gmane.org [mailto:time-nuts-bounces-JSkTLETqlTM&lt; at &gt;public.gmane.org] On Behalf Of Chris Albertson Sent: Wednesday, May 23, 2012 3:13 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Serial port server .. any interest in a write up on using ? On Wed, May 23, 2012 at 9:08 AM, Bob Camp &lt;lists-30jTmCQ20qY&lt; at &gt;public.gmane.org&gt; wrote: thing. Depends on your accuracy goals. Of course it would work to some degree. But we are talking several orders of degradation if the PPS second is carried over even a dedicated either net that uses only a crossover cable. The problem is not so much the network but t</pre> Bob Camp 2012-05-23T21:02:40 http://permalink.gmane.org/gmane.comp.time.nuts/20752 <pre>Hi They have been sitting in the shed for 15 years now. They were knock off's when I bought them. Bob -----Original Message----- From: time-nuts-bounces-JSkTLETqlTM&lt; at &gt;public.gmane.org [mailto:time-nuts-bounces-JSkTLETqlTM&lt; at &gt;public.gmane.org] On Behalf Of DaveH Sent: Wednesday, May 23, 2012 2:46 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Serial port -- multi-port cards Hi Bob Actually, I checked the website before posting and Digi has drivers for Windows Vista and 2008 ( as well as XP, 2K and 98)-- I will see if it works on Win7 before posting what I have. What cards do you have? Dave _______________________________________________ time-nuts mailing list -- time-nuts-JSkTLETqlTM&lt; at &gt;public.gmane.org To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. </pre> Bob Camp 2012-05-23T20:59:02 http://permalink.gmane.org/gmane.comp.time.nuts/20751 <pre>On Wed, May 23, 2012 at 12:13 PM, Chris Albertson &lt;albertson.chris-Re5JQEeQqe8AvxtiuMwx3w&lt; at &gt;public.gmane.org&gt; wrote: One thing I forgot to add. Gigabit switches are WORSE for NTP then the 100BaseT switches. Seems odd at first but the two work differently. Faster switches buffer the data and add timing uncertainty. </pre> Chris Albertson 2012-05-23T19:20:06 http://permalink.gmane.org/gmane.comp.time.nuts/20750 <pre> Depends on your accuracy goals. Of course it would work to some degree. But we are talking several orders of degradation if the PPS second is carried over even a dedicated either net that uses only a crossover cable. The problem is not so much the network but the buffer in the ethernet interface. This is the same thing that happens when petiole try and send the PPS over a serial to USB cable. Those cables typically cost you two orders of magnitude timing error. The reason the direct connected PPS is so good is because of the simple hardware design and the even simpler software interrupt handler. There are only four of five lines of code that get executed. It is so simple. Both Either net and USB are "packetized" where the data arrive in chunks and the entire chunk has to get inside the computer before it can be looked at. While PPS to a serial port is just an edge triggered logic gate that forces an interrupt. Again you can do it but you take a 10E2 or 10E3 "hit". If you do need to send a P</pre> Chris Albertson 2012-05-23T19:13:00 http://permalink.gmane.org/gmane.comp.time.nuts/20749 <pre>Hi Bob Actually, I checked the website before posting and Digi has drivers for Windows Vista and 2008 ( as well as XP, 2K and 98)-- I will see if it works on Win7 before posting what I have. What cards do you have? Dave </pre> DaveH 2012-05-23T18:45:40 http://permalink.gmane.org/gmane.comp.time.nuts/20748 <pre>Hi Henry: You might just try using a spreadsheet to calculate the complex impedance of your model circuit and manually play with the parameter values and get them to match the measured data. Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/Clarke4Congress.html ehydra wrote: </pre> Brooke Clarke 2012-05-23T18:37:50 http://permalink.gmane.org/gmane.comp.time.nuts/20747 <pre>Hi time-nuts! If I remember correctly here was a discussion about an older HP impedance measurement equipment. The one which is able to calculate a 6 ideal parts replacement circuit for the measured passive device. How does is it works? I would like to fit parts for simulation in SPICE. So I need something like a algorithm to fit for minimum error a input table with complex numbers (frequency-sweep) to this 6 part circuit. For example the universal capacitor component in LTspice is able to hold RLC and even XTAL data and more like residual current for electrolytics. Any ideas? Thanks - Henry </pre> ehydra 2012-05-23T18:12:41 http://permalink.gmane.org/gmane.comp.time.nuts/20746 <pre>I had my Nortel running on the bench, in the open, for about 48 Hours, fed with a pretty good quality Lambda power supply. I suspect that any perceived diiference between it and the T'bolts may be down to the oven, which I suspect may be a double oven in the case of the Nortel. Due to the seller putting a sticky label on it helpfully saying "used" any identification has gone, but the size of it for it's age would indicate that it is something like the Morion inside. I don't see the temperature variation effects on the LH display that both my t'bolts show. It's performance at the 10,000 Tau level after 24 hours, with only the quick survey, and no tuning of any parameters was on a par with my T'bolt / E1938 and a little better than the standard t'bolt, all fed from the same antenna / splitter. It does, as Mark pointed out, see a better signal strength than the standard t'bolts, but as there are two RF amp stages visible on the board, with three filters, that doesn't surprise. I suspect the t</pre> Dan Rae 2012-05-23T17:35:53 Search the mailing list at Gmane query http://search.gmane.org/?group=$group=gmane.comp.time.nuts