Re: [time-nuts] Crude Survey Technique
John In answer to your original questions, No problem if you have a good setup including a good sky view, antenna, and TBolt setup. It is important to do each run at the different locations at the same time of the day and average the results for as long as you can. Best is to do a 24 Hr survey at each location. see the attached LH plot for the effect of time on location reading error. Multiple Tbolts on the same antenna don't help, unless they are on different antennas. ws *** - Original Message - From: johncr...@aol.com To: time-nuts@febo.com Sent: Thursday, November 21, 2013 10:52 AM Subject: [time-nuts] Crude Survey Technique I wish to establish a north south line on my property to an accuracy of +/- 2 degrees. Could this be done by loading a T-bolt, Antenna, Power source, and laptop into my little red wagon? The idea being to find two positions several hundred ft apart where either LH or T-bolt Mon report the same latitude? Will either of these programs report to sufficient accuracy? The base line would be 300 ft, though more is possible.I realizes that the T-bolt is not a survey device, but I can spend several hours fixing each position if required. All comments appreciated.?? -73 john k6iql Question - If I use 3 T-bolts on the same antenna, feedline, splitter etc. and run 3 instances of T-bolt mon - can the results be improved??? attachment: ws-1-3D#2.gif___ 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 (WarrenS)
Warren, Understood. I have a couple more questions. Once the thunderbolt has completed a survey, does it continue to update its position or are the final numbers at the end of the survey frozen until a new survey has started. If it continues to update the logging feature in the thunderbolt monitor outputs the data in a convenient format.I will also give Lady Heather a try. it has several operational modes such as; stationary, land and a couple of others. Which mode would be most useful to determine a fixed position. I have three of the little beasties chugging away and doing an initial survey. Later on this evening I'll see what they come up with. Thanks for your help – John Re: Crude Survey Technique (WarrenS) -Original Message- From: time-nuts-request time-nuts-requ...@febo.com To: time-nuts time-nuts@febo.com Sent: Sat, Nov 23, 2013 1:07 pm Subject: time-nuts Digest, Vol 112, Issue 80 Send time-nuts mailing list submissions to time-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to time-nuts-requ...@febo.com You can reach the person managing the list at time-nuts-ow...@febo.com When replying, please edit your Subject line so it is more specific than Re: Contents of time-nuts digest... Today's Topics: 1. Re: Crude Survey Technique (WarrenS) -- Message: 1 Date: Sat, 23 Nov 2013 11:03:54 -0800 From: WarrenS warrensjmail-...@yahoo.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Crude Survey Technique Message-ID: CBA8FAFF2BCD4EF2A5A2D6B98BF891DB@Warcon28Gz Content-Type: text/plain; charset=iso-8859-1; Format=flowed John In answer to your original questions, No problem if you have a good setup including a good sky view, antenna, and TBolt setup. It is important to do each run at the different locations at the same time of the day and average the results for as long as you can. Best is to do a 24 Hr survey at each location. see the attached LH plot for the effect of time on location reading error. Multiple Tbolts on the same antenna don't help, unless they are on different antennas. ws *** - Original Message - From: johncr...@aol.com To: time-nuts@febo.com Sent: Thursday, November 21, 2013 10:52 AM Subject: [time-nuts] Crude Survey Technique I wish to establish a north south line on my property to an accuracy of +/- 2 degrees. Could this be done by loading a T-bolt, Antenna, Power source, and laptop into my little red wagon? The idea being to find two positions several hundred ft apart where either LH or T-bolt Mon report the same latitude? Will either of these programs report to sufficient accuracy? The base line would be 300 ft, though more is possible.I realizes that the T-bolt is not a survey device, but I can spend several hours fixing each position if required. All comments appreciated.?? -73 john k6iql Question - If I use 3 T-bolts on the same antenna, feedline, splitter etc. and run 3 instances of T-bolt mon - can the results be improved??? -- next part -- A non-text attachment was scrubbed... Name: ws-1-3D#2.gif Type: image/gif Size: 34594 bytes Desc: not available URL: http://www.febo.com/pipermail/time-nuts/attachments/20131123/1497b620/attachment.gif -- ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts End of time-nuts Digest, Vol 112, Issue 80 ** ___ 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 (WarrenS)
johncr...@aol.com said: Understood. I have a couple more questions. Once the thunderbolt has completed a survey, does it continue to update its position or are the final numbers at the end of the survey frozen until a new survey has started. The position is frozen. That's the whole point of the survey. After the survey, it switches to a different mode, different math. It assumes it knows the position and uses that to get a more accurate time. It also works with fewer satellites. -- 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] Crude Survey Technique
I hope no-one believes all the decimal digits shown in that screen-shot! It seems to me that it would be better if more realistic values were presented! 37.808842 °C - really! 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.
[time-nuts] Man killed in quartz crystal accident
The US Chemical Safety Board have released their report into the 2009 accident at NDK's synthetic crystal growing facility in Belvidere IL http://www.csb.gov/assets/1/19/CSB_CaseStudy_NDK_1107_500PM.pdf It also describes the process. Basically a 50ft autoclave failed, killing a member of the public at a rest stop 650ft away. Looks like management decisions, probably based on cost, overriding engineering advice even following an earlier minor incident. The letters from a consulting engineer in the annex make interesting reading. It illustrates the importance of those professional engineers amongst us notifying and recording any safety issues we discover. The facility is still shut down and the insurance company won't settle as NDK were told of possible issues. Robert G8RPI. ___ 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.
