Re: [time-nuts] Checking Time difference between PCs
This might do, even though I doubt the routines are using rdtsc to interpolate nondeterministic offset of the PIC architecture. w32tm /stripchart /computer:target [/period:refresh] [/dataonly] [/samples:count] The current time is 3/8/2009 21:05:30 (local time).21:05:30 d:+00.000s o:+00.3047845s Cheers, Chris On Thu, May 23, 2013 at 5:26 PM, Rex Moncur rmon...@bigpond.net.au wrote: I wonder if anyone has suggestions as to how to check the timing variations between two PCs that are running windows. The background to this request is that I am running two instances of the Weak Signal Program WSJT on the same computer and get variations of +/-0.2 seconds. It has been suggested that the variations might be caused by the windows operating system. As a check on this I am proposing to run two PCs locked by GPS-18 USB and set by NMEATime which should show the difference on WSJT. But is there some program that will show the difference due to the PC clocks alone? Or perhaps a program that outputs the PC time as a pulse on a sound card so I can compare these on a CRO. Regards Rex VK7MO ___ 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] FE-5680A control programs
You have been collecting programs? I did not know there were any to collect. Do you have a list? I don't have much use for a .exe file but is your are source codes available that would be great. On Thu, May 23, 2013 at 4:44 PM, EB4APL eb4...@cembreros.jazztel.es wrote: Hello, Since I bought my FE-5680A (10 MHz, 1 PPS variety), I have been collecting control programs for it and keeping then in reserve. Now that I'm going to box it with a distribution amp I tried some of them, first of all to adjust the frequency against the GPS. I used Bob Campbel's VK4XV Fe5680Calibrator.exe with good results. I have other programs which interrogates the device and shows the hex dumps, but I would like to know if there is a windows program that allows to send other that the offset related commands to the device and get the responses not in hex but translated to plain language. In fact I don't know if there are housekeeping commands for reading thinks like the lock status or the lamp voltage like the analog outputs of the FRS-C and others. Thanks in advance, Ignacio EB4APL __**_ 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. -- Chris Albertson Redondo Beach, California ___ 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] Checking Time difference between PCs
Run NTP on each PC. The use the ntpq command to print out a nice table. Simply using NTP on Windows will force the clocks to be without about .002 seconds. That is about as good as you can do using Windows.BSD or Linux can get about 2 uSec. NTP software is free and not hard to set up. The billboard that ntpq prints out shows clock offsets on milliseconds (to .001 mSec) as well as jitter in the same units On Thu, May 23, 2013 at 2:26 PM, Rex Moncur rmon...@bigpond.net.au wrote: I wonder if anyone has suggestions as to how to check the timing variations between two PCs that are running windows. The background to this request is that I am running two instances of the Weak Signal Program WSJT on the same computer and get variations of +/-0.2 seconds. It has been suggested that the variations might be caused by the windows operating system. As a check on this I am proposing to run two PCs locked by GPS-18 USB and set by NMEATime which should show the difference on WSJT. But is there some program that will show the difference due to the PC clocks alone? Or perhaps a program that outputs the PC time as a pulse on a sound card so I can compare these on a CRO. Regards Rex VK7MO ___ 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. -- Chris Albertson Redondo Beach, California ___ 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] Checking Time difference between PCs
I wonder if anyone has suggestions as to how to check the timing variations between two PCs that are running windows. The background to this request is that I am running two instances of the Weak Signal Program WSJT on the same computer and get variations of +/-0.2 seconds. It has been suggested that the variations might be caused by the windows operating system. As a check on this I am proposing to run two PCs locked by GPS-18 USB and set by NMEATime which should show the difference on WSJT. But is there some program that will show the difference due to the PC clocks alone? Or perhaps a program that outputs the PC time as a pulse on a sound card so I can compare these on a CRO. Regards Rex VK7MO == Rex, My NTP plotter program may help with that task: http://www.satsignal.eu/software/net.htm#NTPmonitor If you are using a PPS GPS (/not/ a USB version) and install NTP your should easily get within a millisecond on Windows PCs, see my results here: http://www.satsignal.eu/mrtg/performance_ntp.php#windows-stratum-1 Installing NTP on Windows, and using some GPS/PPS receivers: http://www.satsignal.eu/ntp/setup.html 73, David GM8ARV -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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] Net4501's cheap...
Perhaps you have the older boards. google Raspberry Pi Reboots on inserting a USB device by mahjongg ยป Mon Nov 19, 2012 12:09 am Don't hot plug USB devices directly into the PI, if you must hot plug plug into a hub instead! Its called the rush in current problem, and it makes that the current PI itself is non hot pluggable, note that the revision 1 PI was hot pluggable, as the two polyfuses prevented any rush in current because the fuses had a non zero resistance. But in the current board there is literally zero resistance between the PI's 5V supply, and any USB device you plug in, that means that if you plug in any USB device with empty power decouplers, (which act as a complete short for a very small time) then you are actually simply shorting the 5V when you plug de USB device in. The polyfuses in the revision 1 board however caused much greater problems than this problem, and for that reason have been removed. My Raspberry Pis are all model B with the 512 MB RAM, purchased in Oct 2012, Nov 2012 and April 2013. I have been using devices which conform to the USB spec, not hard disks which may take a higher transient initial current than 500 mA (note that some of these devices are supplied with two USB leads, one of which is power only). Devices such as a Wi-Fi adapter and a DVB receiver. I am also using a good power supply, not a minimally spec'ed unit - it's a 5.25V 2A model as supplied by ModMyPi. Photo of successfully hot-plugged devices: http://www.satsignal.eu/Radio/dump1090.html Performance of three Raspberry Pis as timekeepers with indoor GPS antennas: http://www.satsignal.eu/mrtg/performance_ntp.php Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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] 9390 GPS RX
Hold on mate! You're not quite done yet. :) You said you tweaked the cap to get the Control Voltage to 8 volts and saw the proper frequency. You should be able to move the cap, and therefore the control voltage, anywhere in the 2 to 12 volt range and still see the proper frequency. Does that work? The next area is the Rb lamp itself. What's the voltage on pin 7 (Rb Lamp)? If it's much below 7V you could have trouble with the unit dropping out of lock. While you've got the unit on the bench, you should also check the temperature of the lamp since it's easy to do. Don't try to measure it while it's powered. Open up the access port to the lamp, power down, and measure the temperature. The tolerance on the temperature is not stated, but since it's running at 115C, too hot will burn out the poor transistor that's being used as a heater while too cold will give a weak light that could cause locking problems. Finally, power the unit on from cold and make sure that the frequency sweep still works properly and after a few minutes the sweep stops, the crystal control voltage stabilizes, the frequency looks good, and pin 5 (Resonance Lock) goes from open to ground. If everything looks good, you can consider your repairs complete. The manual lists other things that you could check, but in my limited experience, if the above tests are good, it's not worth doing any more. Ed On 5/23/2013 7:31 PM, Mark C. Stephens wrote: You were spot on about the negative efc thing. Turns out I was using a bad negative point. I used the supply negative and I saw the EFC was sitting at about 3.5Volts. So I tweaked the Cap to 8 Volts and what do you know, my counter says 10 000 000 07. Dead on 10 Mhz, we have done it Ed, you and I! :) I want to do some checks for spectral purity and drift before I install the 9390's Ball back in. Good stuff mate :) -marki -Original Message- From: Mark C. Stephens Sent: Friday, 24 May 2013 10:37 AM To: time-nuts@febo.com Subject: RE: [time-nuts] 9390 GPS RX Ed, I nailed it, R7 2M ohm, a crappy old carbon composition resistor had gone high to 3 Meg in the positive feedback loop to the 741. Once replaced The temperature still wasn't hitting 79 degrees I checked all the other resistors and found R12 6K81 was a little low at 6K79 so I went through my metal film boxes and found one that was spot on 6.81K. Replaced that' but still not the right temperature. The only thing left was the thermistor and the 741. The thermistor appeared okay at 18K cold so that left the 741. Luckily, I had some new 741HM metal can jobs in stock. Once it was replaced all is now hunky dory. Temperature is a steady 79 degrees. Multiple component failures are a worry to me, I can explain the 2M resistor but the 741 failing is not good. Also the back of the board is lacquered. When I used my PCB cleaner for clean the solder flux off, it melted the lacquer leaving a sticky white coloured goo on the back of the board. I had to get a tooth brush and scrub it all off and apply a new coat of lacquer. Didn't see that one coming ;) Well I am happy to say that The output isn't sweeping anymore, however its locked to the wrong frequency! The counter I trust implicitly, I have 6 house standards that all read 10 000 000 07 on it so I know exactly what 10 Mhz is on it. For some reason the FRK has locked to 10 000 117 54 and there it stays. According to the troubleshooting flowchart it's the A21 Crystal oscillator board. They mention one should set the trimmer cap to midway and disconnect the wire off E9 and apply +6V there. Form there you have to pick 2 values for 2 caps to set the centre frequency and adjust range (C11 and C12) But with my luck its probably not that easy.. I really should get some sleep... -marki -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Friday, 24 May 2013 5:02 AM To: time-nuts@febo.com Subject: Re: [time-nuts] 9390 GPS RX I applaud your enthusiasm, but Slow Down! Don't go randomly trying things. The more you touch, the more you break! If you damage the Rb lamp, you will not be able to find a replacement. You shouldn't have touched it without a good reason. 1. Did you confirm that the frequency sweep isn't getting to 10 MHz? What are the frequency limits on the sweep? Are you sure about the calibration of your counter? Since you've already adjusted the trimmer you don't know what the values were before, but can you adjust the trimmer so that the sweep includes 10 MHz exactly? If your counter isn't up to the challenge, put your house standard on one channel of your scope and put the FRK output on the other. Trigger off the house standard and if the FRK is centered around 10 MHz you should see the FRK as a blur that eventually slows down so you can see it scrolling left or right, stops, and then starts scrolling the other direction until it's a blur
Re: [time-nuts] Checking Time difference between PCs
Dear me! Your clock is off by four years and change! Bill Hawkins! -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Christopher Quarksnow Sent: Thursday, May 23, 2013 9:06 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Checking Time difference between PCs This might do, even though I doubt the routines are using rdtsc to interpolate nondeterministic offset of the PIC architecture. w32tm /stripchart /computer:target [/period:refresh] [/dataonly] [/samples:count] The current time is 3/8/2009 21:05:30 (local time).21:05:30 d:+00.000s o:+00.3047845s Cheers, Chris On Thu, May 23, 2013 at 5:26 PM, Rex Moncur rmon...@bigpond.net.au wrote: I wonder if anyone has suggestions as to how to check the timing variations between two PCs that are running windows. The background to this request is that I am running two instances of the Weak Signal Program WSJT on the same computer and get variations of +/-0.2 seconds. It has been suggested that the variations might be caused by the windows operating system. As a check on this I am proposing to run two PCs locked by GPS-18 USB and set by NMEATime which should show the difference on WSJT. But is there some program that will show the difference due to the PC clocks alone? Or perhaps a program that outputs the PC time as a pulse on a sound card so I can compare these on a CRO. Regards Rex VK7MO ___ 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] Checking Time difference between PCs
From: Chris Albertson [] Simply using NTP on Windows will force the clocks to be without about .002 seconds. That is about as good as you can do using Windows. [] == .. although these performance graphs suggest that 50-250 microseconds can be achieved on Windows when run as stratum-1 servers with PPS syncing: http://www.satsignal.eu/mrtg/performance_ntp.php#windows-stratum-1 Performance /does/ vary with different Windows versions, and when you add in LAN, Wi-Fi, or even WAN synching your 2 milliseconds figure is not unreasonable, and it can be worse as seen on at least one PC here (portable Mercury synced over Wi-Fi). http://www.satsignal.eu/mrtg/performance_ntp.php#windows Rex, there is little or no extra cost in using NTP as a stratum-1 server, the GPS receivers are readily available at low cost, and you may have a COM port header on your motherboard even if there is no COM socket at the rear. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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] FE-5680A control programs
A few months ago Fabio Eboli posted some Python functions that might be useful. I haven't used or tested them myself, but they might be of interest. Still up on pastebin at http://pastebin.com/download.php?i=VpZVuw0t I don't know if Fabio has done any further work on this but perhaps he'll chime in here. Paul On May 24, 2013, at 0:22, Chris Albertson albertson.ch...@gmail.com wrote: You have been collecting programs? I did not know there were any to collect. Do you have a list? I don't have much use for a .exe file but is your are source codes available that would be great. On Thu, May 23, 2013 at 4:44 PM, EB4APL eb4...@cembreros.jazztel.es wrote: Hello, Since I bought my FE-5680A (10 MHz, 1 PPS variety), I have been collecting control programs for it and keeping then in reserve. Now that I'm going to box it with a distribution amp I tried some of them, first of all to adjust the frequency against the GPS. I used Bob Campbel's VK4XV Fe5680Calibrator.exe with good results. I have other programs which interrogates the device and shows the hex dumps, but I would like to know if there is a windows program that allows to send other that the offset related commands to the device and get the responses not in hex but translated to plain language. In fact I don't know if there are housekeeping commands for reading thinks like the lock status or the lamp voltage like the analog outputs of the FRS-C and others. Thanks in advance, Ignacio EB4APL __**_ 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. -- Chris Albertson Redondo Beach, California ___ 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] Checking Time difference between PCs
Yes, there is a free program that can poll all your windows machines on a network. http://www.greyware.com/software/domaintime/instructions/tools/lmcheck.asp Jason I wonder if anyone has suggestions as to how to check the timing variations between two PCs that are running windows. The background to this request is that I am running two instances of the Weak Signal Program WSJT on the same computer and get variations of +/-0.2 seconds. It has been suggested that the variations might be caused by the windows operating system. As a check on this I am proposing to run two PCs locked by GPS-18 USB and set by NMEATime which should show the difference on WSJT. But is there some program that will show the difference due to the PC clocks alone? Or perhaps a program that outputs the PC time as a pulse on a sound card so I can compare these on a CRO. Regards Rex VK7MO ___ 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] Checking Time difference between PCs
PC clocks are cheap and not intended to be accurate, it's why time synchronization is one of the things managed when a windows machine joins an AD domain. As AD uses multi-master replication accurate time stamps are required for normal operation Best recommendation is to run NTP not SNTP as NTP compensates for the clock skew and applies corrections for the clock characteristics Sent from my iPhone On May 24, 2013, at 1:04 AM, Chris Albertson albertson.ch...@gmail.com wrote: Run NTP on each PC. The use the ntpq command to print out a nice table. Simply using NTP on Windows will force the clocks to be without about .002 seconds. That is about as good as you can do using Windows.BSD or Linux can get about 2 uSec. NTP software is free and not hard to set up. The billboard that ntpq prints out shows clock offsets on milliseconds (to .001 mSec) as well as jitter in the same units On Thu, May 23, 2013 at 2:26 PM, Rex Moncur rmon...@bigpond.net.au wrote: I wonder if anyone has suggestions as to how to check the timing variations between two PCs that are running windows. The background to this request is that I am running two instances of the Weak Signal Program WSJT on the same computer and get variations of +/-0.2 seconds. It has been suggested that the variations might be caused by the windows operating system. As a check on this I am proposing to run two PCs locked by GPS-18 USB and set by NMEATime which should show the difference on WSJT. But is there some program that will show the difference due to the PC clocks alone? Or perhaps a program that outputs the PC time as a pulse on a sound card so I can compare these on a CRO. Regards Rex VK7MO ___ 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. -- Chris Albertson Redondo Beach, California ___ 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] Net4501's cheap...
This may be way off topic, but the inrush current problem is probably with devices not meeting the USB specification. As it turns out, a lot of low end devices do not meet this spec. I spent some time redesigning the power supply system of one such device I was using. This time was covered by the company that built the device, and eventually it went into production. High speed clamp on probe showed 2Amps inrush, where it was supposed to be much smaller than that. That caused all sorts of havoc. It worked fine on a PC USB, where the 5V line is very stiff. USB hubs were a different story. My bet is a workaround would be a stiff cap (ceramic, not 'lytic) at the USB on the Pi board to counteract empty filters on the hot plugged device may help. Maybe a small impedance between the 5V supply of the Pi board and the cap would help. Dan On 5/23/2013 8:37 PM, time-nuts-requ...@febo.com wrote: by mahjongg ? Mon Nov 19, 2012 12:09 am Don't hot plug USB devices directly into the PI, if you must hot plug plug into a hub instead! Its called the rush in current problem, and it makes that the current PI itself is non hot pluggable, note that the revision 1 PI was hot pluggable, as the two polyfuses prevented any rush in current because the fuses had a non zero resistance. But in the current board there is literally zero resistance between the PI's 5V supply, and any USB device you plug in, that means that if you plug in any USB device with empty power decouplers, (which act as a complete short for a very small time) then you are actually simply shorting the 5V when you plug de USB device in. ___ 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] FE-5680A control programs
Hello, I'm still here, unfortunately my Rb are gathering dust and I cannot follow the list everyday. I wrote some scripts to automate data collection from FE5680 and my counter using python. They run in Windows and can be used and modified at will, I've not much time now, so I cannot give support on their usage, but it should be easy enough. I will check what I have... Il 2013-05-24 14:06 Ziggy9 ha scritto: A few months ago Fabio Eboli posted some Python functions that might be useful. I haven't used or tested them myself, but they might be of interest. Still up on pastebin at http://pastebin.com/download.php?i=VpZVuw0t I don't know if Fabio has done any further work on this but perhaps he'll chime in here. Paul On May 24, 2013, at 0:22, Chris Albertson albertson.ch...@gmail.com wrote: You have been collecting programs? I did not know there were any to collect. Do you have a list? I don't have much use for a .exe file but is your are source codes available that would be great. On Thu, May 23, 2013 at 4:44 PM, EB4APL eb4...@cembreros.jazztel.es wrote: Hello, Since I bought my FE-5680A (10 MHz, 1 PPS variety), I have been collecting control programs for it and keeping then in reserve. Now that I'm going to box it with a distribution amp I tried some of them, first of all to adjust the frequency against the GPS. I used Bob Campbel's VK4XV Fe5680Calibrator.exe with good results. I have other programs which interrogates the device and shows the hex dumps, but I would like to know if there is a windows program that allows to send other that the offset related commands to the device and get the responses not in hex but translated to plain language. In fact I don't know if there are housekeeping commands for reading thinks like the lock status or the lamp voltage like the analog outputs of the FRS-C and others. Thanks in advance, Ignacio EB4APL __**_ 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. -- Chris Albertson Redondo Beach, California ___ 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] FE-5680A control programs
Here the last revision for the interface script: http://pastebin.com/rVuDK3py This is an example of data logging using the previous functions: http://pastebin.com/H9sMT1GP I had somewhere also a script that put out nice real time graphs from the logged data, see matplotlib, numpy, etc... Hope this helps. I'm sorry I cannot keep working with Rb, (busy looking for new job now, no luck so far...) but if there are any questions I will try to answer as far as I can :) Ciao! Il 2013-05-24 14:06 Ziggy9 ha scritto: A few months ago Fabio Eboli posted some Python functions that might be useful. I haven't used or tested them myself, but they might be of interest. Still up on pastebin at http://pastebin.com/download.php?i=VpZVuw0t I don't know if Fabio has done any further work on this but perhaps he'll chime in here. Paul On May 24, 2013, at 0:22, Chris Albertson albertson.ch...@gmail.com wrote: You have been collecting programs? I did not know there were any to collect. Do you have a list? I don't have much use for a .exe file but is your are source codes available that would be great. On Thu, May 23, 2013 at 4:44 PM, EB4APL eb4...@cembreros.jazztel.es wrote: Hello, Since I bought my FE-5680A (10 MHz, 1 PPS variety), I have been collecting control programs for it and keeping then in reserve. Now that I'm going to box it with a distribution amp I tried some of them, first of all to adjust the frequency against the GPS. I used Bob Campbel's VK4XV Fe5680Calibrator.exe with good results. I have other programs which interrogates the device and shows the hex dumps, but I would like to know if there is a windows program that allows to send other that the offset related commands to the device and get the responses not in hex but translated to plain language. In fact I don't know if there are housekeeping commands for reading thinks like the lock status or the lamp voltage like the analog outputs of the FRS-C and others. Thanks in advance, Ignacio EB4APL __**_ 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. -- Chris Albertson Redondo Beach, California ___ 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] 9390 GPS RX
I have owned a similar 9390-5588A with the FRK Rb inside for a few years now. Although the Rb is quite old, the unit locks in just 3 minutes and finds the GPS time (off by 1024 weeks, 16 sec, UTC) in four minutes and displays an initial PDOP 03. I have reset the time to the correct UTC time but after a short period it always reverts to the original time. If I recall the antenna voltage was +12vdc and I traced the line and reconnected it to +5vdc. The antenna is roof mounted and runs through a Lucent GPS ant amp/5-way splitter. I don't recall which ones it was now but I did have a problem with 2 of these old GPS receivers on the same antenna, apparently reradiating enough of a signal from the LO or whatever so that it knocked the other receiver off line. My version of this vintage 9390 has an added switch on the front to choose where it gets the 1PPS signal to compare and it has both an a.c. and a d.c. supply. From what I have seen almost no 2 of these units were exactly the same so it is hard to find an exact manual and I don't have one at all so it made setting this unit up kind of difficult. The circuit boards directly in front of the FRK use wire-wrap connector so they could customized these units for each end-user. -Arthur ___ 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] Net4501's cheap...
Date: Fri, 24 May 2013 06:42:43 +0100 From: David J Taylor david-tay...@blueyonder.co.uk I am also using a good power supply, not a minimally spec'ed unit - it's a 5.25V 2A model as supplied by ModMyPi. Sure. I think my point is that I've seen this problem on both of my units when powered by both a 5V2A wall adapter supply and a 5V.8A supply. Since the problem has been reported by other people it's sufficient for me to look to other solutions that don't have this (admittedly minor) possibly configuration related flaw. Besides I got them to run NTP and they're too jittery for my taste. ___ 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] Net4501's cheap...
My solution is not to use the R Pi. An extra $20 gets you any number of superior arm SBCs. Go cortex-A7 type cpu. The Beagleboard XM I'm using has a bug in the built-in usb hub (patchable), but it has no issues with hot plugging. The R Pi is designed to be cheap, but you spend a lot of time doing work-arounds, hardware and software. At some point, an extra $20 looks like a bargain. -Original Message- From: Dan Kemppainen d...@irtelemetrics.com Sender: time-nuts-boun...@febo.com Date: Fri, 24 May 2013 09:44:46 To: time-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] Net4501's cheap... This may be way off topic, but the inrush current problem is probably with devices not meeting the USB specification. As it turns out, a lot of low end devices do not meet this spec. I spent some time redesigning the power supply system of one such device I was using. This time was covered by the company that built the device, and eventually it went into production. High speed clamp on probe showed 2Amps inrush, where it was supposed to be much smaller than that. That caused all sorts of havoc. It worked fine on a PC USB, where the 5V line is very stiff. USB hubs were a different story. My bet is a workaround would be a stiff cap (ceramic, not 'lytic) at the USB on the Pi board to counteract empty filters on the hot plugged device may help. Maybe a small impedance between the 5V supply of the Pi board and the cap would help. Dan On 5/23/2013 8:37 PM, time-nuts-requ...@febo.com wrote: by mahjongg ? Mon Nov 19, 2012 12:09 am Don't hot plug USB devices directly into the PI, if you must hot plug plug into a hub instead! Its called the rush in current problem, and it makes that the current PI itself is non hot pluggable, note that the revision 1 PI was hot pluggable, as the two polyfuses prevented any rush in current because the fuses had a non zero resistance. But in the current board there is literally zero resistance between the PI's 5V supply, and any USB device you plug in, that means that if you plug in any USB device with empty power decouplers, (which act as a complete short for a very small time) then you are actually simply shorting the 5V when you plug de USB device in. ___ 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] FE-5680A control programs
I added a command to display or change the frequency offset to my ZCOMM program. To use it: port 1 fe [new offset] On 05/24/2013 05:06 AM, Ziggy9 wrote: A few months ago Fabio Eboli posted some Python functions that might be useful. I haven't used or tested them myself, but they might be of interest. Still up on pastebin at http://pastebin.com/download.php?i=VpZVuw0t I don't know if Fabio has done any further work on this but perhaps he'll chime in here. Paul On May 24, 2013, at 0:22, Chris Albertson albertson.ch...@gmail.com wrote: You have been collecting programs? I did not know there were any to collect. Do you have a list? I don't have much use for a .exe file but is your are source codes available that would be great. On Thu, May 23, 2013 at 4:44 PM, EB4APL eb4...@cembreros.jazztel.es wrote: Hello, Since I bought my FE-5680A (10 MHz, 1 PPS variety), I have been collecting control programs for it and keeping then in reserve. Now that I'm going to box it with a distribution amp I tried some of them, first of all to adjust the frequency against the GPS. I used Bob Campbel's VK4XV Fe5680Calibrator.exe with good results. I have other programs which interrogates the device and shows the hex dumps, but I would like to know if there is a windows program that allows to send other that the offset related commands to the device and get the responses not in hex but translated to plain language. In fact I don't know if there are housekeeping commands for reading thinks like the lock status or the lamp voltage like the analog outputs of the FRS-C and others. Thanks in advance, Ignacio EB4APL __**_ 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. -- Chris Albertson Redondo Beach, California ___ 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. -- Chuck Forsberg WA7KGX c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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] NTP on RaspberryPi
Besides I got them to run NTP and they're too jittery for my taste. How good/bad were they? What were you using for a time source? Does it have PPS support? -- These are my opinions. I hate spam. ___ 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] EGG TS-RFS telcom RB
Hi EGG went to great lengths to verify the fill in their cells. The units you have should be at least as good as the large Efratom Rb's of the same era. Bob On May 23, 2013, at 2:00 PM, paul swed paulsw...@gmail.com wrote: Hello to the group I obtained 2 of these units at the last MIT flea. Both not working correctly. Virtually no documentation on the internet. I recall that 2 years ago someone else asked EGG info also and no real responses. That said I can tell you a few things. There is a diagram on the unit that shows the 16 connections. Its accurate. +24 requires up to 1.5A cold and drops to 300-400 ma hot +5 for the synthesizer draws a constant 300 ma It seems you can start the RB up without the +5 RB and synthesizer are quite separate. The EGGs seem to have a fair amount of reserve RB gas in the lamp. The two units I have have high lamp voltages even though they were mid 1990s. Both units were bad. The problem is the 470 uf @25 V 15 volt bypass caps and a regulator cap 270 uf @16V. It literally fell apart when I was removing it. One of the 470 UFcaps read 1UF esr 2.6 ohms Replaced with high temp 50 V equivalents and both units startup and automatically lock in about 5 minutes. Changing these caps also put the units back into specification for stability. So there you have it the total EGG cookbook of RBs. Good luck and they do seem to be a fine unit. Regards Paul. WB8TSL ___ 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] EGG TS-RFS telcom RB
Thanks Bob and judging from the lamp voltage I believe it. Quite a surprise on both of them. One is 97 and the other 99. At least for these units we have a drop of information that did not seem to be available before. Regards Paul WB8TSL On Fri, May 24, 2013 at 5:42 PM, Bob Camp li...@rtty.us wrote: Hi EGG went to great lengths to verify the fill in their cells. The units you have should be at least as good as the large Efratom Rb's of the same era. Bob On May 23, 2013, at 2:00 PM, paul swed paulsw...@gmail.com wrote: Hello to the group I obtained 2 of these units at the last MIT flea. Both not working correctly. Virtually no documentation on the internet. I recall that 2 years ago someone else asked EGG info also and no real responses. That said I can tell you a few things. There is a diagram on the unit that shows the 16 connections. Its accurate. +24 requires up to 1.5A cold and drops to 300-400 ma hot +5 for the synthesizer draws a constant 300 ma It seems you can start the RB up without the +5 RB and synthesizer are quite separate. The EGGs seem to have a fair amount of reserve RB gas in the lamp. The two units I have have high lamp voltages even though they were mid 1990s. Both units were bad. The problem is the 470 uf @25 V 15 volt bypass caps and a regulator cap 270 uf @16V. It literally fell apart when I was removing it. One of the 470 UFcaps read 1UF esr 2.6 ohms Replaced with high temp 50 V equivalents and both units startup and automatically lock in about 5 minutes. Changing these caps also put the units back into specification for stability. So there you have it the total EGG cookbook of RBs. Good luck and they do seem to be a fine unit. Regards Paul. WB8TSL ___ 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] Checking Time difference between PCs
It was just a sample to show the precision. On Fri, May 24, 2013 at 3:39 AM, Bill Hawkins b...@iaxs.net wrote: Dear me! Your clock is off by four years and change! Bill Hawkins! -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Christopher Quarksnow Sent: Thursday, May 23, 2013 9:06 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Checking Time difference between PCs This might do, even though I doubt the routines are using rdtsc to interpolate nondeterministic offset of the PIC architecture. w32tm /stripchart /computer:target [/period:refresh] [/dataonly] [/samples:count] The current time is 3/8/2009 21:05:30 (local time).21:05:30 d:+00.000s o:+00.3047845s Cheers, Chris On Thu, May 23, 2013 at 5:26 PM, Rex Moncur rmon...@bigpond.net.au wrote: I wonder if anyone has suggestions as to how to check the timing variations between two PCs that are running windows. The background to this request is that I am running two instances of the Weak Signal Program WSJT on the same computer and get variations of +/-0.2 seconds. It has been suggested that the variations might be caused by the windows operating system. As a check on this I am proposing to run two PCs locked by GPS-18 USB and set by NMEATime which should show the difference on WSJT. But is there some program that will show the difference due to the PC clocks alone? Or perhaps a program that outputs the PC time as a pulse on a sound card so I can compare these on a CRO. Regards Rex VK7MO ___ 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] Checking Time difference between PCs
I wonder if anyone has suggestions as to how to check the timing variations between two PCs that are running windows. If you are running ntpd, you can turn on logging for rawstats. That will write a line to the log file for the client end of a client-server exchange, aka when the response to a request-response pair gets back to the client. Each line will have 4 time stamps. With a bit of arithmetic you can compute the offset. (I'll say more if anybody wants.) Note that a server is also a client, so you can use any server to monitor several/many other systems. If you don't want those systems to contribute to your time, turn on noselect. You can also set minpoll/maxpoll to get more or less data. -- These are my opinions. I hate spam. ___ 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] FLUKE PM6680B Counter Time View software for the PC
Hello The Net: Can anyone point me to a source for the subject software ? Thanks Stan, W1LE Cape Cod ___ 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] NTP on RaspberryPi
On Fri, May 24, 2013 at 8:14 PM From: Hal Murray Besides I got them to run NTP and they're too jittery for my taste. How good/bad were they? The view from the RPi*: server (local remote refid st t when poll reach delay offset jitter 127.0.0.1 o127.127.22.0.PPS.0 l-8 3770.000 -0.001 0.003 192.168.0.192 *192.168.0.2 .PPS.1 u-8 3770.460 -0.003 0.037 192.168.0.192 +192.168.0.210 .GPS.1 u78 3770.920 -0.019 0.202 192.168.0.192 +192.168.0.244 .PPS.1 u78 3770.493 0.022 0.031 The view from a mini-itx/Atom system: server (local remote refid st t when poll reach delay offset jitter 127.0.0.1 o127.127.22.0.PPS.0 l18 3770.000 0.000 0.002 192.168.0.244 +192.168.0.2 .PPS.1 u88 3770.085 0.004 0.002 192.168.0.244 +192.168.0.210 .GPS.1 u78 3770.544 0.001 0.216 192.168.0.244 *192.168.0.192 .PPS.1 u68 3770.485 -0.008 0.025 One odd system is enough. What were you using for a time source? Does it have PPS support? I have a variety of PPS sources. The RPi is most often connected to a Sure dev. board. David Taylor linked to Hauke Lampe who did a kernel build with PPS drivers. *The tables look okay here but are probably trashed 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] Net4501's cheap...
-Original Message- From: Paul Sure. I think my point is that I've seen this problem on both of my units when powered by both a 5V2A wall adapter supply and a 5V.8A supply. Since the problem has been reported by other people it's sufficient for me to look to other solutions that don't have this (admittedly minor) possibly configuration related flaw. Besides I got them to run NTP and they're too jittery for my taste. === Paul, Just what devices were you hot-plugging to produce this problem? One with an initial current surge outside the USB spec I could understand. NTP performance on the three Raspberry Pi cards here can be of the same order as FreeBSD running on an Intel Atom PC: http://www.satsignal.eu/mrtg/performance_ntp.php The RPi cards are all using very low cost GPS/PPS receivers with no external antenna, and the FreeBSD box has an external roof-mounted GPS 18 LVC. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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.
