My thanks to all that contributed ideas, especially Don's sundial approach. You all have established that if there is an excessively? complex approach I will be sure to think of that first. Let see what else pops up.
-73 john k6iql -----Original Message----- From: time-nuts-request <[email protected]> To: time-nuts <[email protected]> Sent: Thu, Nov 21, 2013 2:31 pm Subject: time-nuts Digest, Vol 112, Issue 68 Send time-nuts mailing list submissions to [email protected] 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 [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..." Today's Topics: 1. Re: Off-Topic Question -- German Composition Resistors (Robert LaJeunesse) 2. Crude Survey Technique ([email protected]) 3. Re: Crude Survey Technique (Poul-Henning Kamp) 4. Re: Crude Survey Technique (Don Latham) 5. Re: Crude Survey Technique (Don Latham) 6. Re: Crude Survey Technique (J. Forster) 7. OT: Putting the Wolfram Language (and Mathematica) on every Raspberry Pi (David J Taylor) 8. Re: Crude Survey Technique (Brian Lloyd) ---------------------------------------------------------------------- Message: 1 Date: Thu, 21 Nov 2013 10:38:10 -0800 (PST) From: Robert LaJeunesse <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] Off-Topic Question -- German Composition Resistors Message-ID: <[email protected]> Content-Type: text/plain; charset=iso-8859-1 If it had 4 color bands 2701 you are likely reading it backward. 1072 would be 10.7K Bob L. >________________________________ > From: "[email protected]" <[email protected]> >To: [email protected] >Sent: Thursday, November 21, 2013 1:11 PM >Subject: [time-nuts] Off-Topic Question -- German Composition Resistors > > >While tracing out a PC board from an instrument manufactured in Germany, I? >quickly discovered the color code on 1/4-watt composition resistors is not? >the same as that commonly used in the US? For example, I would measure? >about 10,000-ohms across a presumably good resistor that appeared to be marked? >2700-ohms.? Has/does Germany used a different code for such parts? > >Bruce, KG6OJI >_______________________________________________ >time-nuts mailing list -- [email protected] >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. > > > ------------------------------ Message: 2 Date: Thu, 21 Nov 2013 13:52:49 -0500 (EST) From: [email protected] To: [email protected] Subject: [time-nuts] Crude Survey Technique Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" 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 ------------------------------ Message: 3 Date: Thu, 21 Nov 2013 19:11:51 +0000 From: "Poul-Henning Kamp" <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]>, [email protected] Subject: Re: [time-nuts] Crude Survey Technique Message-ID: <[email protected]> Content-Type: text/plain; charset=ISO-8859-1 In message <[email protected]>, johncroos@ aol.com writes: > I wish to establish a north south line on my property to an >accuracy of +/- 2 degrees. First of all, at that level of precision you will have to decide what you mean by "north south" ? Magnetic ? Geodetic ? (if so: Which Datum ?) Meridian ? > The base line would be 300 ft So your east-west precision needs to be tan(2)*300ft = 10.5 ft. I don't think you can do that with a single band GPS. If you can locate suitable landmarks, you may be able to do with the arial photograph on maps.google.com (or similar servce) but you need to get coordinates figured out (not trivial!) I would raise a pole or other marker at one end (N or S), calculate when a suitable celestial object crosses your designated line and that to triangulate the opposite end. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ------------------------------ Message: 4 Date: Thu, 21 Nov 2013 12:12:47 -0700 From: "Don Latham" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]> Subject: Re: [time-nuts] Crude Survey Technique Message-ID: <[email protected]> Content-Type: text/plain;charset=iso-8859-1 John: for local noon: http://education.illinois.edu/noon-project/noontime.html Don [email protected] > 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 > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > -- "The power of accurate observation is commonly called cynicism by those who have not got it." -George Bernard Shaw Dr. Don Latham AJ7LL Six Mile Systems LLC 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 Skype: buffler2 www.lightningforensics.com www.sixmilesystems.com ------------------------------ Message: 5 Date: Thu, 21 Nov 2013 12:11:03 -0700 From: "Don Latham" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]> Subject: Re: [time-nuts] Crude Survey Technique Message-ID: <[email protected]> Content-Type: text/plain;charset=iso-8859-1 Lord no, John. No red wagon is needed. Use a pole and the equation of time, and a good watch or clock. At local noon, a shadow will be a n-s line. If you don't have a decent clock, like your cellphone, put in a pole at one end of your line. Near local noon, which depends on where you are in the timezone, start sticking pegs in the end of the shadow of the pole; the shortest shadow will be the n-s line. Accuracy much better than 2 deg. I'm sure other ways will come to you :-) Don [email protected] > 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 > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > -- "The power of accurate observation is commonly called cynicism by those who have not got it." -George Bernard Shaw Dr. Don Latham AJ7LL Six Mile Systems LLC 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 Skype: buffler2 www.lightningforensics.com www.sixmilesystems.com ------------------------------ Message: 6 Date: Thu, 21 Nov 2013 11:11:19 -0800 (PST) From: "J. Forster" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]> Subject: Re: [time-nuts] Crude Survey Technique Message-ID: <[email protected]> Content-Type: text/plain;charset=iso-8859-1 For something that crude, I'd consider taking a sight on Polaris. If you note the time and do the math, you can probably do better than your bounds. Also, there is almost certainly an app somewhere to do the math for you. I think tha reeuction info was in Bowditch or the Nautical Almanac. FWIW, -John =================== > In message <[email protected]>, > johncroos@ > aol.com writes: > >> I wish to establish a north south line on my property to an >>accuracy of +/- 2 degrees. > > First of all, at that level of precision you will have to decide what > you mean by "north south" ? > > Magnetic ? Geodetic ? (if so: Which Datum ?) Meridian ? > >> The base line would be 300 ft > > So your east-west precision needs to be tan(2)*300ft = 10.5 ft. > > I don't think you can do that with a single band GPS. > > If you can locate suitable landmarks, you may be able to do with > the arial photograph on maps.google.com (or similar servce) but > you need to get coordinates figured out (not trivial!) > > I would raise a pole or other marker at one end (N or S), calculate > when a suitable celestial object crosses your designated line and > that to triangulate the opposite end. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > [email protected] | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by > incompetence. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > ------------------------------ Message: 7 Date: Thu, 21 Nov 2013 19:27:35 -0000 From: "David J Taylor" <[email protected]> To: "Time-nuts mailing list" <[email protected]> Subject: [time-nuts] OT: Putting the Wolfram Language (and Mathematica) on every Raspberry Pi Message-ID: <B255B1361B9848D7A3E18D3783CD6483@Alta> Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Putting the Wolfram Language (and Mathematica) on every Raspberry Pi http://blog.wolfram.com/2013/11/21/putting-the-wolfram-language-and-mathematica-on-every-raspberry-pi/ and it's free. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: [email protected] ------------------------------ Message: 8 Date: Thu, 21 Nov 2013 13:04:46 -0600 From: Brian Lloyd <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] Crude Survey Technique Message-ID: <CAE3hgTd3ZPtmnjkUW=ju_a-xowv+jizpkmpm7q5z475xchf...@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 On Thu, Nov 21, 2013 at 12:52 PM, <[email protected]> wrote: > 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. > True north or magnetic north? In any case, a good lensatic compass and knowing your magnetic variation should easily get you to within 2 degrees and is a lot easier than doing a survey with your GPS. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 [email protected] +1.916.877.5067 ------------------------------ _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts End of time-nuts Digest, Vol 112, Issue 68 ****************************************** _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
