Re: [time-nuts] 1pps; what good is it?
It also has a 1 pulse per second output; what is it good for, in industry, and for me? That 1 PPS signal ticks on the UTC second boundary. That lets you transfer accurate time as well as frequency to other boxes. Suppose you want to build a time server. If you connect up the serial port, you can ask the Z3801A what time it is. The answer won't be very accurate (few ms) because of delays in the serial port hardware and software. With a PPS signal (and widely available patches to the OS) you can get that down to microseconds. The PPS signal alone doesn't tell you which second a pulse corresponds to. You need to know the time within a fraction of a second by some other means such as the serial port. -- The suespammers.org mail server is located in California. So are all my other mailboxes. Please do not send unsolicited bulk e-mail or unsolicited commercial e-mail to my suespammers.org address or any of my other addresses. These are my opinions, not necessarily my employer's. I hate spam. ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] 1pps; what good is it?
the 1 sec pulse can be used on a counter for a gating the 10mhz on the counter to set it very close as one example. ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
[time-nuts] Cesium lockup
Fellow time-nuts, This evening I was presented with a dilemma, either to check if my repaired Cs beam would lockup or go out dancing (and chasing chicks). Being told about the dancing a bit late, being inproperly dressed, unshaved and all, I felt the time nut in me was having a strong case, so it became a Cesium lockup wake instead! ;O) And yes, to the best of my abilities to judge things, after the replacement of a tired component, my Cesium beam now locks up and behaves quite sanely. It is still tracking in closer and closer but it seems to track along. Before I had an oscillating behaviour since it lost lock due to noisy measures which could be traced to a particular component. I was unable to find a replacement but a fellow time-nut helped me out and this evening I got the additional help to solder the replacement in. I want to monitor the progress over the next few days (with continous logging) but it looks very promessing. Now I have a nice little challenge in finding out how I best is going to have it hooked up and kept running in my rig. So, I just wanted to share this happy feeling with some people that might apprechiate it. Now I may start calibrating my Rubidium (finally after all these years). I have to arrange for a propper GPS antenna solution too. But now I have a good feeling to start the exercises from. ;O) Cheers, Magnus ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] Cesium lockup
That's friggin' awesome! :) cheers, glenn Magnus Danielson wrote: Fellow time-nuts, This evening I was presented with a dilemma, either to check if my repaired Cs beam would lockup or go out dancing (and chasing chicks). Being told about the dancing a bit late, being inproperly dressed, unshaved and all, I felt the time nut in me was having a strong case, so it became a Cesium lockup wake instead! ;O) ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
[time-nuts] On Setting Precision Clock
Hi: I've been working on making a LCD based clock where the PIC microcontroller uses a precision frequency source as it's heartbeat. Today I got the LCD navigation and time-date setting to work, but don't like it. The current version stops the clock and then uses the cursor and blink hardware features of the LCD, but the problem is that cursor and blink are global, i.e. they can not be used when the LCD is being updated constantly (like once each second). So I'm thinking of better ways to set the clock and my current idea is to use a couple of characters at the very upper right of the LCD is indicators. They might be HH, MM, SS, YR, MO, DY or others, and can be changed by the Select button. Then pressing the Increment or decrement buttons would change the associated counter. This way you would not loose the 1 PPS edge when changing the time or date. http://www.pacificsites.com/~brooke/PRC68COM.shtml#PC3 - as it is today Any thoughts? Have Fun, Brooke Clarke -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] Cesium lockup
Magnus, Congratulations. You have moved closer to the goal that motivates us all, knowing the exact time to 10E-6 times less than human wetware is capable of comprehending, or is that 10E-12. It is remarkable that we are able to measure time to far more precision than we can measure physical things, especially since post-modern science suggests that time doesn't exist. But then, post-modern pushes the envelope beyond all reasonable dimensions. No criticism intended - I have enjoyed and learned from your postings. Regards, Bill Hawkins -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Magnus Danielson Sent: Friday, July 21, 2006 6:03 PM To: time-nuts@febo.com Subject: [time-nuts] Cesium lockup Fellow time-nuts, This evening I was presented with a dilemma, either to check if my repaired Cs beam would lockup or go out dancing (and chasing chicks). Being told about the dancing a bit late, being inproperly dressed, unshaved and all, I felt the time nut in me was having a strong case, so it became a Cesium lockup wake instead! ;O) And yes, to the best of my abilities to judge things, after the replacement of a tired component, my Cesium beam now locks up and behaves quite sanely. It is still tracking in closer and closer but it seems to track along. Before I had an oscillating behaviour since it lost lock due to noisy measures which could be traced to a particular component. I was unable to find a replacement but a fellow time-nut helped me out and this evening I got the additional help to solder the replacement in. I want to monitor the progress over the next few days (with continous logging) but it looks very promessing. Now I have a nice little challenge in finding out how I best is going to have it hooked up and kept running in my rig. So, I just wanted to share this happy feeling with some people that might apprechiate it. Now I may start calibrating my Rubidium (finally after all these years). I have to arrange for a propper GPS antenna solution too. But now I have a good feeling to start the exercises from. ;O) Cheers, Magnus ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.394 / Virus Database: 268.10.3/394 - Release Date: 7/20/2006 ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] On Setting Precision Clock
At 6:29 PM -0700 7/21/06, Brooke Clarke wrote: Hi: I've been working on making a LCD based clock where the PIC microcontroller uses a precision frequency source as it's heartbeat. Today I got the LCD navigation and time-date setting to work, but don't like it. The current version stops the clock and then uses the cursor and blink hardware features of the LCD, but the problem is that cursor and blink are global, i.e. they can not be used when the LCD is being updated constantly (like once each second). So I'm thinking of better ways to set the clock and my current idea is to use a couple of characters at the very upper right of the LCD is indicators. They might be HH, MM, SS, YR, MO, DY or others, and can be changed by the Select button. Then pressing the Increment or decrement buttons would change the associated counter. This way you would not loose the 1 PPS edge when changing the time or date. http://www.pacificsites.com/~brooke/PRC68COM.shtml#PC3 - as it is today Any thoughts? Have Fun, Brooke Clarke Brooke, You can make some digits blink by changing them to spaces every other time you write out the string to the LCD. Write the string out about 4 times per second, resulting in two blinks per second. It's a bit more work, but it gives better control of the display. -- --David Forbes, Tucson, AZ http://www.cathodecorner.com/ ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
