[time-nuts] Lady Heather help, please
Trying to run LH2 with a TBolt under WinXP. I need to change her com port to 3, which is where my serial-to-USB adapter is located -- and port 1 is in use. I see in the tip sheet that I can use the command line. Trouble is, I can't find it. Hitting most keys will display a menu of letters to invoke various things, but I can't get to anything that looks like a command line to use the /3 command. Suggestions? TIA, Dick Moore ___ 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] Lady Heather help, please
Hi Dick, You could try doing a right click on the icon/link you use to call Lady Heather and select properties and then in the command line that shows add the /3 to the end. Hopefully, I explained that well enough and it will work ! BillWB6BNQ Dick Moore wrote: Trying to run LH2 with a TBolt under WinXP. I need to change her com port to 3, which is where my serial-to-USB adapter is located -- and port 1 is in use. I see in the tip sheet that I can use the command line. Trouble is, I can't find it. Hitting most keys will display a menu of letters to invoke various things, but I can't get to anything that looks like a command line to use the /3 command. Suggestions? TIA, Dick Moore ___ 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 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] Lady Heather help, please
Trying to run LH2 with a TBolt under WinXP. I need to change her com port to 3, which is where my serial-to-USB adapter is located -- and port 1 is in use. I see in the tip sheet that I can use the command line. Trouble is, I can't find it. Hitting most keys will display a menu of letters to invoke various things, but I can't get to anything that looks like a command line to use the /3 command. Suggestions? This is just referring to the DOS command that you use to launch heather.exe, whether from a Windows shortcut or from a command prompt in a DOS box. If you are running from a shortcut, you would right-click on the shortcut and modify the 'Target' line to include the parameter(s) you want the program to start with. To connect to specific Thunderbolts at startup time, change the Target line from this: C:\Program Files\Heather\heather.exe ... to one that looks like this: C:\Program Files\Heather\heather.exe /3 (local Thunderbolt on COM3) or C:\Program Files\Heather\heather.exe /ip=ke5fx.dyndns.org:45000 (remote Thunderbolt attached to a Heather server, version 3 only) -- john, KE5FX -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Dick Moore Sent: Monday, September 12, 2011 11:45 PM To: time-nuts@febo.com Subject: [time-nuts] Lady Heather help, please TIA, Dick Moore ___ 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 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] GPS Antenna
Hi Sometimes a very small movement in the antenna can help. The antenna sitting on a table inside the window probably does not do as well as the antenna sitting on top of a flower pot outside the window. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Azelio Boriani Sent: Monday, September 12, 2011 7:00 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS Antenna OK, now I see (the indoor GPS unit) and agree (a window facing south). 73s On Mon, Sep 12, 2011 at 11:19 PM, Chris Albertson albertson.ch...@gmail.com wrote: On Mon, Sep 12, 2011 at 1:31 PM, Azelio Boriani azelio.bori...@screen.it wrote: Yes, if you are at 55 degrees (N or S) you have satellites at most straight on your head and I think you must start facing just south, say, at 70 degrees and beyond. I'm in Italy at 45 degrees north (JN55BK QTH locator) so no such a problem. Yes, you certainly have no problem. But look and I bet that you see more GPS satellites to the south than to the north.This whole thing came up in the context of an indoor GPS receiver looking out a window. Question was if you can choose any window which is best. Chris Albertson Redondo Beach, California ___ 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 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 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] Old Frequency Electronics standard and synthesizer
Hi Brooke -- Good idea. I was thinking of another way to get at least a sense of what's going on: look at the input current from power-on and see if the current goes down in a normal fashion as the ovens warm up. If the current stays high, that would (presumably) mean that the voltage isn't sufficient to get the oven up to temperature. I'm out of town next weekend but will try some experiments along these lines, and also take a few pictures of the thing. John On 9/11/2011 4:38 PM, Brooke Clarke wrote: Hi John: How about just changing the input voltage and comparing to the meter reading, i.e. are they 1:1? If there's a power supply then watch it's output voltage as the input is brought up and at some point the output voltage will stabilize. How about some photos? Have Fun, Brooke Clarke http://www.PRC68.com http://www.End2PartyGovernment.com/ John Ackermann N8UR wrote: Years ago I found an interesting box at a hamfest. It's from Frequency Electronics and is labeled as a model FE-6018A Precision Frequency Synthesizer. It has an FE-10A 5 MHz frequency standard, and several internal filter/mixer/other stuff modules. In addition to a 5 MHz output, it has the following: 5 kHz square wave, 5 kHz sine wave, 50 MHz, 100 MHz and 100.05 MHz. (Except that the panel is labeled KC and MC; a date stamp indicates that this unit might have been built in 1969.) At the time I didn't find any documentation for it, and a Google search today didn't turn up much either (even the FE-10A seems undocumented, though I'm sure I've seen others). I wonder if anyone here has heard of this beast or knows what it was used for? Also, its power input is a DC connector that's similar to, but I don't think matches, the DC connector HP uses on the 5061 etc. The unit came with a clearly after-market 18V power supply with the proper connector. I've never been sure, though, whether 18V is the correct operating voltage. The only clue on the exterior of the box is that the label showing proper readings for the meter on the FE-10A module indicates that 17 volts is proper -- but I don't know if that's being monitored at the back panel or at some other point. With the 18V supply hooked up, the meter is reading in the lower part of the orange normal range. Does 18V seem like a sane supply voltage for a piece of gear like this, or is it more likely to be 24 volts? Thanks for any info; I have the thing warming up now (on its 18V supply) and hope to get some idea of how well it works; I had it running 20 years ago but probably not since then. John ___ 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 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 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] Lady Heather help, please
First: Find the directory where LH resides (mine is D:\Program Files (x86)\Heather). Click the Windows start icon In the search windw type command Click on the command prompt. Change to the LH directory (I am using mine, you will have to find your own location). enter- D: (return)This puts you on the correct drive enter - cd Program Files (x86)\Heather (return) This puts you in the right directory Run the program, enter: heather /3 (return) this runs LH in port 3 Hope this helps Michael / K7HIL On Mon, Sep 12, 2011 at 11:44 PM, Dick Moore rich...@hughes.net wrote: Trying to run LH2 with a TBolt under WinXP. I need to change her com port to 3, which is where my serial-to-USB adapter is located -- and port 1 is in use. I see in the tip sheet that I can use the command line. Trouble is, I can't find it. Hitting most keys will display a menu of letters to invoke various things, but I can't get to anything that looks like a command line to use the /3 command. Suggestions? TIA, Dick Moore ___ 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 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] Averaging Location for Position Hold
Hi all! I am installing a timing GPS unit over a new location where I already have a NMEA GPS with PPS (let's call it unit A). The NMEA GPS is logging every 16 seconds its GPGGA string. I have a log with around 213400 samples. Each line is similar to this one 55817 48494.500 127.127.20.0 $GPGGA,132814.000,4055.2142,N,00829.6071,W,2,9,1.06,278.9,M,51.2,M,,*4E I averaged the minutes of latitude and longitude, the MSL (278.9) and the Geoid Separation (51.2) and got the following 40º 55.2155' N 8º 29.6044' W (MSL 268.195m and Geoid Separation 51.2m) (for unit A) I entered this location on Google Maps I got a position that is in the middle of a close street (see footer for image; real location is the red dot). I also have another GPS unit (let's call it unit B) that is on the roof and did the same calculations (36500 samples): 40º 55.2228' N 8º 29.6103' W (MSL 262.66m and Geoid Separation 51.7m) (for unit B) When I plot this with Google Maps I get the exact location of the antenna (within 1 meter; see footer for image; real location is the red dot). I am assuming the first unit has some kind of internal error. Or, does Google Maps has an offset? I need this information to enter the precise location in the Oncore UT+ unit I will be using at this location. I will be using the location of unit A. Cheers, Miguel The images available here: http://dl.dropbox.com/u/11210443/GPS%20A.JPG and http://dl.dropbox.com/u/11210443/GPS%20B.JPG. I did not attach these to the message to reduce traffic on the mailing list server. ___ 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] Averaging Location for Position Hold
In message CAEdntmtEcC=_N1uwvNb2GZqVX8r-AXO81hw+SXF6=p+kegb...@mail.gmail.com , =?ISO-8859-1?Q?Miguel_Gon=E7alves?= writes: I have a log with around 213400 samples. Each line is similar to this one [...] I averaged the minutes of latitude and longitude, the MSL (278.9) and the Geoid Separation (51.2) and got the following That doesn't work very well, because the variation in your samples is not a random distribution: Echos and other multipath is the same every day, the buildings that cause it do not move. A much better strategy is to weigh the filtering by DOP quality or even better, if you have the actual residuals from each of the satelites used. You may find some inspiration here: http://phk.freebsd.dk/raga/sneak/ -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@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@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Averaging Location for Position Hold
2011/9/13 Miguel Gonçalves m...@miguelgoncalves.com: Hi all! I am installing a timing GPS unit over a new location where I already have a NMEA GPS with PPS (let's call it unit A). The NMEA GPS is logging every 16 seconds its GPGGA string. The Oncore UT+ can does it's own site survey automatically. That's the best way. You can only compare the GPS location with Google if both are using the same system. The most common one today is WPS84 but you need to check. The problem is that the Earth is not a Sphere and different systems assume non-sphere shapes. Getting this wrongs gives about the size error you observed, more or less. Also, can you really trust Google Earth as an authoritative source? I'm not sure.An interesting test would be to go find a USGS benchmark or a section marker near you then enter it's location into Google. See if Google hits the marker. -- Chris Albertson Redondo Beach, California ___ 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] Averaging Location for Position Hold
I believe that should read WGS 84 not WPS84. John WA4WDL -- From: Chris Albertson albertson.ch...@gmail.com Sent: Tuesday, September 13, 2011 5:03 PM To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Averaging Location for Position Hold 2011/9/13 Miguel Gonçalves m...@miguelgoncalves.com: Hi all! I am installing a timing GPS unit over a new location where I already have a NMEA GPS with PPS (let's call it unit A). The NMEA GPS is logging every 16 seconds its GPGGA string. The Oncore UT+ can does it's own site survey automatically. That's the best way. You can only compare the GPS location with Google if both are using the same system. The most common one today is WPS84 but you need to check. The problem is that the Earth is not a Sphere and different systems assume non-sphere shapes. Getting this wrongs gives about the size error you observed, more or less. Also, can you really trust Google Earth as an authoritative source? I'm not sure.An interesting test would be to go find a USGS benchmark or a section marker near you then enter it's location into Google. See if Google hits the marker. -- Chris Albertson Redondo Beach, California ___ 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 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] Averaging Location for Position Hold
Also, can you really trust Google Earth as an authoritative source? I'm not sure.An interesting test would be to go find a USGS benchmark or a section marker near you then enter it's location into Google. See if Google hits the marker. -- For what it's worth, my Thunderbolts here did a 48 hour survey, and the position they report, fed into google earth, hits the north side of the 3' x 3' skylight they are in. Roughly 18 error. Maybe luck, but they both report almost identical positions. I'm north of Denver, so I'm a bit off the spherical average. ___ 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] Averaging Location for Position Hold
Also, can you really trust Google Earth as an authoritative source? I'm not sure.An interesting test would be to go find a USGS benchmark or a section marker near you then enter it's location into Google. See if Google hits the marker. -- For what it's worth, my Thunderbolts here did a 48 hour survey, and the position they report, fed into google earth, hits the north side of the 3' x 3' skylight they are in. Roughly 18 error. Maybe luck, but they both report almost identical positions. I'm north of Denver, so I'm a bit off the spherical average. Google is very good on many occations and not so good once in a while. Also note google does not do true orthoimages, so true distance/position is hard to get where you have altitude differences. http://en.wikipedia.org/wiki/File:OrthoPerspective.svg -- Björn ___ 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] Averaging Location for Position Hold
Thanks! I believe then that is best to rely on SynTac position averaging or the auto-survey feature? Regards, Miguel On 13 September 2011 20:24, Poul-Henning Kamp p...@phk.freebsd.dk wrote: In message CAEdntmtEcC=_N1uwvNb2GZqVX8r-AXO81hw+SXF6= p+kegb...@mail.gmail.com , =?ISO-8859-1?Q?Miguel_Gon=E7alves?= writes: I have a log with around 213400 samples. Each line is similar to this one [...] I averaged the minutes of latitude and longitude, the MSL (278.9) and the Geoid Separation (51.2) and got the following That doesn't work very well, because the variation in your samples is not a random distribution: Echos and other multipath is the same every day, the buildings that cause it do not move. A much better strategy is to weigh the filtering by DOP quality or even better, if you have the actual residuals from each of the satelites used. You may find some inspiration here: http://phk.freebsd.dk/raga/sneak/ -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@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@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ 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] Averaging Location for Position Hold
Hi Chris! The problem with auto-survey is that it doesn't report the averaged position in the log file. I haven't checked if the binary protocol enables access to this but if it does it's just a matter of patching the driver IMHO. If I use auto-survey should I continue using mode 1 in ntp.oncore? I believe that the first time it will auto-survey but for the next start-ups it won't. Right? PHK: you had your hands on this driver I believe. Am I saying something stupid? :-) Google Maps reports WGS84. Google Earth reports WGS84 and altitude is MSL (Mean Sea Level) that is easily converted to GPS altitude using the Geoid Correction. Regarding Google Maps accuracy just look at the images I sent in my previous message. The GPS that sits on the roof is giving coordinates that are 1 meter away max from the truth. Cheers, Miguel On 13 September 2011 22:03, Chris Albertson albertson.ch...@gmail.comwrote: 2011/9/13 Miguel Gonçalves m...@miguelgoncalves.com: Hi all! I am installing a timing GPS unit over a new location where I already have a NMEA GPS with PPS (let's call it unit A). The NMEA GPS is logging every 16 seconds its GPGGA string. The Oncore UT+ can does it's own site survey automatically. That's the best way. You can only compare the GPS location with Google if both are using the same system. The most common one today is WPS84 but you need to check. The problem is that the Earth is not a Sphere and different systems assume non-sphere shapes. Getting this wrongs gives about the size error you observed, more or less. Also, can you really trust Google Earth as an authoritative source? I'm not sure.An interesting test would be to go find a USGS benchmark or a section marker near you then enter it's location into Google. See if Google hits the marker. -- Chris Albertson Redondo Beach, California ___ 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 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] Averaging Location for Position Hold
Hi David! Same here. I discussed this matter with a friend that did some GIS work a few years back and we both believe that the unit reporting the wrong position might be doing this because it's only seeing half of the sky (it is near a window facing SE) while the other one sees the entire sky. My friend pointed out that Google Maps are used today in navigation systems and while the software might have some corrections algorithms built in he believes that the maps should be reasonably accurate. Cheers, Miguel On 13 September 2011 22:25, David VanHorn d.vanh...@elec-solutions.comwrote: Also, can you really trust Google Earth as an authoritative source? I'm not sure.An interesting test would be to go find a USGS benchmark or a section marker near you then enter it's location into Google. See if Google hits the marker. -- For what it's worth, my Thunderbolts here did a 48 hour survey, and the position they report, fed into google earth, hits the north side of the 3' x 3' skylight they are in. Roughly 18 error. Maybe luck, but they both report almost identical positions. I'm north of Denver, so I'm a bit off the spherical average. ___ 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 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] Averaging Location for Position Hold
Google maps/earth is sometimes on the money, and sometimes not. Remember, these are orthorectified images pieced together. That can't be easy. [They are also on my fecal matter list since they trespassed on my land (undeveloped) to place a satellite cross mark for a shoot. Needless to say I was pissed to see the big X on google earth, though now I have free pointers for NEWS. The while paper had mostly rotted away.] I guess the other question is what do you get with Lady Heather? That is, how does it average your position. ___ 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] Averaging Location for Position Hold
On Tue, Sep 13, 2011 at 2:23 PM, jmfranke jmfra...@cox.net wrote: I believe that should read WGS 84 not WPS84. Yes. G and P key are not even close.Put after writing this I'm wondering how old the UT+ is. WGS84 must have been created in '84. Chris Albertson Redondo Beach, California ___ 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] Averaging Location for Position Hold
On 9/13/11 3:10 PM, gary wrote: since they trespassed on my land (undeveloped) to place a satellite cross mark for a shoot. Needless to say I was pissed to see the big X on google earth, though now I have free pointers for NEWS. The while paper had mostly rotted away.] tangential to time nuts (since without position you don't know time)... In some states, surveyors have an implied or explicit right of entry to undeveloped land in order to perform their public good services. i.e. if you have the first order benchmark on your property, you can't unreasonably restrict access if your neighbor needs it to establish their property boundary. Naturally, people can and do argue about what's reasonable In California, Penal Code 602.8 (c)(4) says that licensed surveyors are not subject to trespass laws when enagaged in lawful surveying. So, if you don't give access, and the surveyor hops the fence, you can't have him/her arrested for trespassing. PC 602, in general, is the trespass laws. Civil code 846.5 creates a duty for people to allow reasonable access to surveyors without undue delay. That's the one that says when the surveyor asks, you have to say ok. ___ 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] Averaging Location for Position Hold
Hi All In my case the Google Earth position cf if the GPS averaged position is within 3 metres of the physical position of my GPS RX but about 8 metres from the physical position of my GPS antenna. Can anyone tell me if the length of the cable has any affect on the GPS reported position or is the position defined solely on the position of the antenna? Rex VK7MO ___ 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] Averaging Location for Position Hold
The position is solely defined by the location of the antenna. Once all of the satellite signals enter the antenna, the time differences are fixed, only the absolute time changes. The GPS receiver computes the position of the antenna using time differences. The coax cable length can affect the time, unless compensated for the propagation delay. John WA4WDL -- From: Rex Moncur rmon...@bigpond.net.au Sent: Tuesday, September 13, 2011 6:28 PM To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Subject: Re: [time-nuts] Averaging Location for Position Hold Hi All In my case the Google Earth position cf if the GPS averaged position is within 3 metres of the physical position of my GPS RX but about 8 metres from the physical position of my GPS antenna. Can anyone tell me if the length of the cable has any affect on the GPS reported position or is the position defined solely on the position of the antenna? Rex VK7MO ___ 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 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] Averaging Location for Position Hold
I think I mentioned this is a thread one before. If you are really interested in position accuracy, you look up a calibrated point from the USGS that you can safely and legally access, then take a reading. I say safely because many points are in the middle of the street. Legally means no trespassing or you ask permission. My preference is to find one in a park. ___ 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] Averaging Location for Position Hold
On 13/09/2011, at 23:10, gary li...@lazygranch.com wrote: Google maps/earth is sometimes on the money, and sometimes not. Remember, these are orthorectified images pieced together. That can't be easy. [They are also on my fecal matter list since they trespassed on my land (undeveloped) to place a satellite cross mark for a shoot. Needless to say I was pissed to see the big X on google earth, though now I have free pointers for NEWS. The while paper had mostly rotted away.] What is the location?? I am curious. I guess the other question is what do you get with Lady Heather? That is, how does it average your position? I will try it over this weekend. I have to get a Windows PC. Only Macs and FreeBSD boxes here. Thanks for your ideas! Cheers, Miguel ___ 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 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] Lady Heather help
Thanks, y'all -- that addition to the directory path did it. LH works good! Along the way, I discovered that on my machine, F11 toggles the screen size between full screen, which I can actually read on my big display, and some squashed version that's unusable. Best, Dick Moore ___ 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] Averaging Location for Position Hold
2011/9/13 Miguel Gonçalves m...@miguelgoncalves.com: I guess the other question is what do you get with Lady Heather? That is, how does it average your position? I will try it over this weekend. I have to get a Windows PC. Only Macs and FreeBSD boxes here. I thought Lady Heather. If so do you really have to get a Windows box to run it? Can't it be build on any other platform? Maybe using Wine. Sorry to have to ask but I've not looked at the source code. -- Chris Albertson Redondo Beach, California ___ 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] Averaging Location for Position Hold
Your milage can vary significantly with use of antenna and receiver. Dualfreq chokering and carrierphase shifts the degree significantly. Cheers, Magnus Miguel Gonçalves m...@miguelgoncalves.com skrev: On 13/09/2011, at 23:10, gary li...@lazygranch.com wrote: Google maps/earth is sometimes on the money, and sometimes not. Remember, these are orthorectified images pieced together. That can't be easy. [They are also on my fecal matter list since they trespassed on my land (undeveloped) to place a satellite cross mark for a shoot. Needless to say I was pissed to see the big X on google earth, though now I have free pointers for NEWS. The while paper had mostly rotted away.] What is the location?? I am curious. I guess the other question is what do you get with Lady Heather? That is, how does it average your position? I will try it over this weekend. I have to get a Windows PC. Only Macs and FreeBSD boxes here. Thanks for your ideas! Cheers, Miguel ___ 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 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 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] Lady Heather help
Congrats Dick, I ran into the same problem the first time I wanted to use LH. I could not find a way to change the COM port when first using it. However, once I switched the TBolt to COM 1, let LH run and connect on COM 1, it was easy to change it to another COM port using the various commands displayed. Joe - Original Message - From: Dick Moore rich...@hughes.net To: time-nuts@febo.com Sent: Tuesday, September 13, 2011 6:37 PM Subject: Re: [time-nuts] Lady Heather help Thanks, y'all -- that addition to the directory path did it. LH works good! Along the way, I discovered that on my machine, F11 toggles the screen size between full screen, which I can actually read on my big display, and some squashed version that's unusable. Best, Dick Moore ___ 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 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] Averaging Location for Position Hold
Upon further investigation I learned that Lady Heather is only for Trimble units... I could borrow a Windows laptop from my company for a couple of days. That's how I surveyed my window (current location of the GPS antenna) using SynTac (formerly WinOnCore). Cheers, Miguel On 14 September 2011 01:43, Chris Albertson albertson.ch...@gmail.comwrote: 2011/9/13 Miguel Gonçalves m...@miguelgoncalves.com: I guess the other question is what do you get with Lady Heather? That is, how does it average your position? I will try it over this weekend. I have to get a Windows PC. Only Macs and FreeBSD boxes here. I thought Lady Heather. If so do you really have to get a Windows box to run it? Can't it be build on any other platform? Maybe using Wine. Sorry to have to ask but I've not looked at the source code. -- Chris Albertson Redondo Beach, California ___ 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 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] Averaging Location for Position Hold
Much of the serial interface protocol used by these disciplined oscillators is standard. I plugged my Symetricom into Lady Heather and most features worked. ___ 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] Averaging Location for Position Hold
Lady Heather's precision (nominal 48 hour) survey collects data over multiple 1 hour periods. With 48 hours of data, multipath and transient disturbances are minimized. It applies weighted median filters to the data and does other statistical analysis to arrive at a final location. With a good choke-ring antenna you can get within under a foot. With a crappy patch antenna without a ground plane maybe 6 feet. Simple averaging of the survey samples does not perform nearly as well. As far as Lady Heather not working with other GPSDO's... well, She has good taste. The Trimble Thunderbolt is far and away the best time-nut GPSDO out there. It is highly configurable and controllable, comes with a very good OCXO, and is dirt stinkin' cheap. If you dot all your i's and cross all your t's and pay very close attention to the details you can coax ridiculously high performance out of the tiny little box... rivaling the best cesium references made for under $200. ___ 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] Averaging Location for Position Hold
On 9/13/11 4:24 PM, li...@lazygranch.com wrote: I think I mentioned this is a thread one before. If you are really interested in position accuracy, you look up a calibrated point from the USGS that you can safely and legally access, then take a reading. I say safely because many points are in the middle of the street. Legally means no trespassing or you ask permission. My preference is to find one in a park. Often, you can talk to the local city/county and find out where some accurate benchmarks are, typically on a curb. They are used to define street positions and such. May not be accurate to centimeters, and you'll almost certainly have to convert from some state plane coordinates. ___ 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.
