[time-nuts] Crude Survey Technique (johncroos at aol.com)
johncroos at aol.com
johncroos at aol.com
Thu Nov 21 21:02:16 UTC 2013
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-----
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To: time-nuts <time-nuts at febo.com>
Sent: Thu, Nov 21, 2013 2:31 pm
Subject: time-nuts Digest, Vol 112, Issue 68
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Today's Topics:
1. Re: Off-Topic Question -- German Composition Resistors
(Robert LaJeunesse)
2. Crude Survey Technique (johncroos at aol.com)
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 <rlajeunesse at sbcglobal.net>
To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
Subject: Re: [time-nuts] Off-Topic Question -- German Composition
Resistors
Message-ID:
<1385059090.6740.YahooMailNeo at web181003.mail.ne1.yahoo.com>
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: "Brucekareen at aol.com" <Brucekareen at aol.com>
>To: time-nuts at febo.com
>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
>_______________________________________________
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>
>
------------------------------
Message: 2
Date: Thu, 21 Nov 2013 13:52:49 -0500 (EST)
From: johncroos at aol.com
To: time-nuts at febo.com
Subject: [time-nuts] Crude Survey Technique
Message-ID: <8D0B5020292D91E-CC0-4B0E1 at webmail-vm026.sysops.aol.com>
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" <phk at phk.freebsd.dk>
To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>, johncroos at aol.com
Subject: Re: [time-nuts] Crude Survey Technique
Message-ID: <11440.1385061111 at critter.freebsd.dk>
Content-Type: text/plain; charset=ISO-8859-1
In message <8D0B5020292D91E-CC0-4B0E1 at webmail-vm026.sysops.aol.com>, 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
phk at FreeBSD.ORG | 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" <djl at montana.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Subject: Re: [time-nuts] Crude Survey Technique
Message-ID:
<1eb6792e9b2798e85475bcd2cb5c7607.squirrel at webmail.montana.com>
Content-Type: text/plain;charset=iso-8859-1
John: for local noon:
http://education.illinois.edu/noon-project/noontime.html
Don
johncroos at aol.com
> 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 -- time-nuts at febo.com
> 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" <djl at montana.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Subject: Re: [time-nuts] Crude Survey Technique
Message-ID:
<b901bd139c0074c4c59386d550eb7090.squirrel at webmail.montana.com>
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
johncroos at aol.com
> 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 -- time-nuts at febo.com
> 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" <jfor at quikus.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Subject: Re: [time-nuts] Crude Survey Technique
Message-ID:
<49828.12.226.214.5.1385061079.squirrel at popaccts.quikus.com>
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 <8D0B5020292D91E-CC0-4B0E1 at webmail-vm026.sysops.aol.com>,
> 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
> phk at FreeBSD.ORG | 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 -- time-nuts at febo.com
> 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" <david-taylor at blueyonder.co.uk>
To: "Time-nuts mailing list" <time-nuts at febo.com>
Subject: [time-nuts] OT: Putting the Wolfram Language (and
Mathematica) on every Raspberry Pi
Message-ID: <B255B1361B9848D7A3E18D3783CD6483 at 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: david-taylor at blueyonder.co.uk
------------------------------
Message: 8
Date: Thu, 21 Nov 2013 13:04:46 -0600
From: Brian Lloyd <brian at lloyd.com>
To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
Subject: Re: [time-nuts] Crude Survey Technique
Message-ID:
<CAE3hgTd3ZPtmnjkUW=JU_a-xoWv+jiZPKmPM7Q5Z475xChfFig at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On Thu, Nov 21, 2013 at 12:52 PM, <johncroos at aol.com> 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
brian at lloyd.com
+1.916.877.5067
------------------------------
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