I attached a png to the email and linked the antenna I have tried in my setup.
The cable I said was half a meter was RG-174 with that hole mount antenna, no added ground plane. I have another antenna on a roof, with a fairly long cable run, maybe ten to fifteen meters, but I don't actually know what cable that is. I might need to figure that out. But some tests was as mentioned performed with two recievers with the hole mount antennas. Nick 2014-07-01 22:46 GMT+02:00 David Kelley <[email protected]>: > > where we used 23 meters of RG58, > > RG58 would be ill advised here (too much loss at L band) > We use RG174 for moderately long runs and for temporary runs where vehicle > can damage the coax. > It is thin and it is tough. > > You can get a 500 foot spool from L-com and others for a modest price if > crimping SMA connectors would not be a problem. > > If you are putting up a reference station and can use the larger diameter > cable (which has less loss - a must for longer runs) then RG213 is to be > preferred. > > I am amazed to see reports that these small patch antennas allow obtaining > fixed results. In the absence of a good ground plane I have had poor > results, and even when it worked needed to try and calibrate out the phase > angle biases. [I work in an automotive environment where we typically use a > more costly antenna simply because we do not want that as a factor] > > Nick, is the link you provided below good?, seem to go to a page with a > small patch ant not plot results. > > > Regards > David Kelley > > > > On 7/1/2014 1:16 PM, Anton Strydom wrote: > > Hi Nick > > No for the base I use the Leica GG02 L1/L2 and only use the LEA6 T on the > roving units > I will save a plot and send it to you to show you the results I get. > > What coax to you use? I normally use either LMR 400 where I can use TNC > connectors and 173 where I use SMA but then not longer than 10 cm of 173. > > I have had a situation where have a Leica SR 500 base and a AT504 antenna > where we used 23 meters of RG58, we had lots of problems with the base. I > changed the coax to LMR 400 and did not have any problems after the change > > Regards > > Anton > > > On Tue, Jul 1, 2014 at 10:07 PM, Nick Østergaard <[email protected]> wrote: > > Ok, interresting. Is is working with the patch on both rover and base? > I have tried with a setup, but I had had very bad results, especially > when I moved. Attached is results I have had, and that with antennas > as [1] with bias voltage on and half a meter of coax. The signal is > great as far as I remember. I have LEA6T's also (maybe 4T), although I > don't quite remember exactly, it is quite some time ago since I tried. > > Attached is a post processed result. > > [1] > http://dk.rs-online.com/web/p/smt-antenner/7239151/?searchTerm=SM-1575&relevancy-data=636F3D3226696E3D4931384E4B6E6F776E41734D504E266C753D6461266D6D3D6D61746368616C6C7061727469616C26706D3D5E5B5C707B4C7D5C707B4E647D2D2C2F255C2E5D2B2426706F3D313326736E3D592673743D4D414E5F504152545F4E554D4245522677633D424F5448267573743D534D2D3135373526 > > 2014-07-01 21:38 GMT+02:00 Anton Strydom <[email protected]>: > > Hi Nick > > Yes I get a reasonable plot using that specific unit. However for what we > intend doing in the long term we will be using a different design helical > antenna that we are in the process of developing. > > The units in the photographs are only for testing and setting up but we > > get > > good results. For communication we use cellular routers connected to > > Leica > > GGO2 L1/L2 base or else we use 3D Robotics XBEE radios. On the roving > > unit I > > use an ARM processor where I have 4 rs232 ports available. It works very > well and is very stable. > > The radios I use where i have no cellular coverage. > > Attached is a photograph of the base setup > > Regards > > Anton > > > On Tue, Jul 1, 2014 at 9:27 PM, Nick Østergaard <[email protected]> > > wrote: > > Hi Anton > > Really? You get by with that small patch antenna? Is that a good (green > > in > > rtkplot) RTK solution you get from that constant? > > Regards > Another Nick > > Den 01/07/2014 21.11 skrev "Anton Strydom" <[email protected]>: > > Hi Nick > > I have done a lot of testing with U-Blox LEA 6T at speeds of up to 120 > > km > > / h. Lat & Lon does not appear to be a problem but elevation is a > > problem. I > > paid the equivalent of $60 for the 2 receivers and ceramic patch > > antennas. > > They are accurate on base line up to 10km where after accuracy > drastically degrades. > > I do all my testing in real time and do not post process. > > If you want to I can speak to my supplier and see if they still have > > some > > of the LEA 6T's in stock at the price I paid for them. > > Attached are photographs of the units I am using > > Regards > > Anton > > > On Tue, Jul 1, 2014 at 8:50 PM, Danny Miller <[email protected]> > wrote: > > It does work in moving. But signal problems do still make the > > position > > jump around, trees and buildings and an antenna's orientation > > changing can > > make an error happen. Antenna quality has a lot to do with that, too. > > RTKLib requires a GPS with RAW pseudorange outputs. The NV08C is a > good, cheap one to do it: > > http://www.nvs-gnss.com/contacts.html > > Contact your local sales rep there- it was actually easy in my > experience to order a couple from them, and oddly cheaper than Newark > element 14, as well as quicker to ship. > > Danny > > > On 7/1/2014 1:24 PM, Nick wrote: > > Hello, > > I am interested in getting an RTK GPS setup working for a moving > vehicle, not fast, perhaps 10 mph. I would postprocess the data > > collected > > later, using data downloaded from a nearby station. > > My desire is to log elevation data every few seconds as the vehicle > drives. I hope to achieve 10-20 cm accuracy for the position and the > elevation. > > As I research RTKLIB, it seems like most information I come across is > regarding a static location. Is my goal feasible to achieve this kind > > of > > accuracy as the vehicle moves? > > If so, can anyone recommend a good board to get me started? I'm hoping > to be able to do this for under $200 (just one receiver since the base > station is public) -- please give me a reality check if this is > > unlikely. > > Thanks, > > Nick > > > > _______________________________________________ > This message is sent to you from [email protected] mailing > > list. > > Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your > subscription > For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS > > > > _______________________________________________ > This message is sent to you from [email protected] mailing > > list. > > Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your > subscription > For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS > > > _______________________________________________ > This message is sent to you from [email protected] mailing > > list. > > Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your > subscription > For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS > > _______________________________________________ > This message is sent to you from [email protected] mailing list. > Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your > subscription > For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS > > > _______________________________________________ > This message is sent to you from [email protected] mailing list. > Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your > subscription > For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS > > _______________________________________________ > This message is sent to you from [email protected] mailing list. > Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your > subscription > For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS > > > > _______________________________________________ > This message is sent to you from [email protected] mailing list. > Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your > subscription > For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS > > > -- > Regards, > David Kelley > ITS Programs Manager > SubCarrier Systems Corp. (SCSC) > 1833 East Foothill Blvd. Glendora, CA USA 91741 > 626-485-7528 (Cell) 888-950-8747 (Main) > 626-513-7715 (Office) 888-613-0757 (Fax) > <[email protected]> > > > _______________________________________________ > This message is sent to you from [email protected] mailing list. > Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your > subscription > For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS _______________________________________________ This message is sent to you from [email protected] mailing list. Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your subscription For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS
