[time-nuts] Second FTS4060 shows Drift, is it me?
Hi: A year ago I took apart the FTS4060 that was DOA (s/n 1013) because of rough shipping and used it to figure out most of the interconnect wiring. A few months ago I put it back together with the thought of selling it as a parts unit. But first powered it up and found that it now locked and seemed to be working so tried to set the C-field. For the last couple of weeks it has shown a parabolic plot like s/n 1227, although this time the polarity is opposite that of s/n 1227 which also showed drift, but that may be a setup difference. A plot of s/n 1227 is at: file:///C:/Webdocs/pdf/Cs_Drift0429.pdf The equation for s/n 1013 is: y = 2.7943x2 - 302.64x + 8969.4 and the quality of fit is R2 = 0.9088. The x-axis is in days and the y-axis is in ns. The first derivative of the equation has a first term of 2 * 2.7943 * x ns/day or +5.3E-14 seconds/seconds drift rate. Today's plot is at: file:///C:/Webdocs/pdf/sn1013_850_Drift2.pdf The current setup is: SR620 time interval counter doing 500 averages (500 seconds = 8 1/3 minutes). Start from Motorola M12+T (9 ns jitter). Stop from FTS4060 1 MHz output. Manually enter into spreadsheet date and time of reading (usually not on the 8 1/3 minute change, just a random time) and counter value. For most of the test the SR620 was using it's internal oscillator and just recently I changed it to the PRS10 external standard but that does not seem to have made any difference. Is there something I'm doing wrong that would cause apparent drift? Thanks for any thoughts, Brooke Clarke, N6GCE -- 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] Second FTS4060 shows Drift, is it me? Good Links
Hi: Sorry for the bad links, here are good ones: Today's plot = http://www.pacificsites.com/~brooke/pdf/sn1013_850_Drift2.pdf s/n 1227 29 Apr 2005 plot = http://www.pacificsites.com/~brooke/pdf/Cs_Drift0429.pdf Brooke Brooke Clarke wrote: Hi: A year ago I took apart the FTS4060 that was DOA (s/n 1013) because of rough shipping and used it to figure out most of the interconnect wiring. A few months ago I put it back together with the thought of selling it as a parts unit. But first powered it up and found that it now locked and seemed to be working so tried to set the C-field. For the last couple of weeks it has shown a parabolic plot like s/n 1227, although this time the polarity is opposite that of s/n 1227 which also showed drift, but that may be a setup difference. A plot of s/n 1227 is at: file:///C:/Webdocs/pdf/Cs_Drift0429.pdf The equation for s/n 1013 is: y = 2.7943x2 - 302.64x + 8969.4 and the quality of fit is R2 = 0.9088. The x-axis is in days and the y-axis is in ns. The first derivative of the equation has a first term of 2 * 2.7943 * x ns/day or +5.3E-14 seconds/seconds drift rate. Today's plot is at: file:///C:/Webdocs/pdf/sn1013_850_Drift2.pdf The current setup is: SR620 time interval counter doing 500 averages (500 seconds = 8 1/3 minutes). Start from Motorola M12+T (9 ns jitter). Stop from FTS4060 1 MHz output. Manually enter into spreadsheet date and time of reading (usually not on the 8 1/3 minute change, just a random time) and counter value. For most of the test the SR620 was using it's internal oscillator and just recently I changed it to the PRS10 external standard but that does not seem to have made any difference. Is there something I'm doing wrong that would cause apparent drift? Thanks for any thoughts, Brooke Clarke, N6GCE -- 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] {Spam?} FW: Sun tracking program
Have a book somewhere (in a box - just moved!) called Astronomy for the PC
by Peter Duffett-Smith. Has loads of routines in it. Will dig it out.
Rob Kimberley
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Lester Veenstra
Sent: 06 February 2006 18:31
To: time-nuts@febo.com
Subject: [time-nuts] {Spam?} FW: Sun tracking program
?
Les
M/K1YCM
_
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
Neil Garfinkel
Sent: Monday, February 06, 2006 12:09 PM
To: [EMAIL PROTECTED]
Subject: Sun tracking program
Does anyone have a program/algorithm to track the sun. If so please let me
know. THANKS
Neil KC9BH
301-444-2064
301-576-6445
[EMAIL PROTECTED]
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Mail - Helps protect you from nasty viruses.
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Re: [time-nuts] FW: Sun tracking program
Collins once made a sun tracker. It was a microwave antenna servoed to equipment that followed a sun-specific noise spectrum. It allowed the Navy to sight the sun in any weather, for navigation. As a fan of servomechanisms, has anyone else heard of this? If I still have the article and picture, it's buried deep. Still think one of them would look good on the roof. Bill Hawkins -- From: [EMAIL PROTECTED] On Behalf Of Neil Garfinkel Sent: Monday, February 06, 2006 12:09 PM To: [EMAIL PROTECTED] Subject: Sun tracking program Does anyone have a program/algorithm to track the sun. If so please let me know. THANKS Neil KC9BH 301-444-2064 301-576-6445 [EMAIL PROTECTED] ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
[time-nuts] GPS failure...
Dear fellow time-nuts, Today the little mystery of why we lost the GPS signal at work finally explained itself. Hooking up my Z3801 instead of our normal house-clock did not give any better result. So, today I finally said the antenna goes down for inspection. I had been given the hint that it might have some humidity in it, so I tossed it into one of our climate owens for a nice little steam-off. Instead it proved to be a gentle defrozting action. There was not high humidity, it was a whole little splash of water in there, you heard it as you shaked it. That besides finding a spider in the lower-cap, it had eaten half the o-ring on the outside and near the contact we also found its pray wound in. So, de-bug your antenna before you find it full of wild-life and water-life as we found. This antenna is now de-comissioned and a new is being ordered tomorrow. We will also take the oppertunity to mount it better, possibly even at a different localtion, but that will probably have to wait until spring, as we now have a little snow-storm, not he best situation for walking the rooftops. Hope you learned something. We learned that we need to check the waterlevel in the GPS antenna regularly. I will also hack up a continous logging system so I can get warnings when the signal fades away. I need that at home too anyway. Cheers, Magnus ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
