<div dir="ltr">Hi Nick<div><br></div><div>No for the base I use the Leica GG02 L1/L2 and only use the LEA6 T on the roving units</div><div>I will save a plot and send it to you to show you the results I get.</div><div><br>
</div><div>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.</div><div><br></div><div>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</div>
<div><br></div><div>Regards</div><div><br></div><div>Anton</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jul 1, 2014 at 10:07 PM, Nick Østergaard <span dir="ltr"><<a href="mailto:oe.nick@gmail.com" target="_blank">oe.nick@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Ok, interresting. Is is working with the patch on both rover and base?<br>
I have tried with a setup, but I had had very bad results, especially<br>
when I moved. Attached is results I have had, and that with antennas<br>
as [1] with bias voltage on and half a meter of coax. The signal is<br>
great as far as I remember. I have LEA6T's also (maybe 4T), although I<br>
don't quite remember exactly, it is quite some time ago since I tried.<br>
<br>
Attached is a post processed result.<br>
<br>
[1] <a href="http://dk.rs-online.com/web/p/smt-antenner/7239151/?searchTerm=SM-1575&relevancy-data=636F3D3226696E3D4931384E4B6E6F776E41734D504E266C753D6461266D6D3D6D61746368616C6C7061727469616C26706D3D5E5B5C707B4C7D5C707B4E647D2D2C2F255C2E5D2B2426706F3D313326736E3D592673743D4D414E5F504152545F4E554D4245522677633D424F5448267573743D534D2D3135373526" target="_blank">http://dk.rs-online.com/web/p/smt-antenner/7239151/?searchTerm=SM-1575&relevancy-data=636F3D3226696E3D4931384E4B6E6F776E41734D504E266C753D6461266D6D3D6D61746368616C6C7061727469616C26706D3D5E5B5C707B4C7D5C707B4E647D2D2C2F255C2E5D2B2426706F3D313326736E3D592673743D4D414E5F504152545F4E554D4245522677633D424F5448267573743D534D2D3135373526</a><br>
<br>
2014-07-01 21:38 GMT+02:00 Anton Strydom <<a href="mailto:agstrydom@gmail.com">agstrydom@gmail.com</a>>:<br>
<div class="HOEnZb"><div class="h5">> Hi Nick<br>
><br>
> Yes I get a reasonable plot using that specific unit. However for what we<br>
> intend doing in the long term we will be using a different design helical<br>
> antenna that we are in the process of developing.<br>
><br>
> The units in the photographs are only for testing and setting up but we get<br>
> good results. For communication we use cellular routers connected to Leica<br>
> GGO2 L1/L2 base or else we use 3D Robotics XBEE radios. On the roving unit I<br>
> use an ARM processor where I have 4 rs232 ports available. It works very<br>
> well and is very stable.<br>
><br>
> The radios I use where i have no cellular coverage.<br>
><br>
> Attached is a photograph of the base setup<br>
><br>
> Regards<br>
><br>
> Anton<br>
><br>
><br>
> On Tue, Jul 1, 2014 at 9:27 PM, Nick Østergaard <<a href="mailto:oe.nick@gmail.com">oe.nick@gmail.com</a>> wrote:<br>
>><br>
>> Hi Anton<br>
>><br>
>> Really? You get by with that small patch antenna? Is that a good (green in<br>
>> rtkplot) RTK solution you get from that constant?<br>
>><br>
>> Regards<br>
>> Another Nick<br>
>><br>
>> Den 01/07/2014 21.11 skrev "Anton Strydom" <<a href="mailto:agstrydom@gmail.com">agstrydom@gmail.com</a>>:<br>
>><br>
>>> Hi Nick<br>
>>><br>
>>> I have done a lot of testing with U-Blox LEA 6T at speeds of up to 120 km<br>
>>> / h. Lat & Lon does not appear to be a problem but elevation is a problem. I<br>
>>> paid the equivalent of $60 for the 2 receivers and ceramic patch antennas.<br>
>>><br>
>>> They are accurate on base line up to 10km where after accuracy<br>
>>> drastically degrades.<br>
>>><br>
>>> I do all my testing in real time and do not post process.<br>
>>><br>
>>> If you want to I can speak to my supplier and see if they still have some<br>
>>> of the LEA 6T's in stock at the price I paid for them.<br>
>>><br>
>>> Attached are photographs of the units I am using<br>
>>><br>
>>> Regards<br>
>>><br>
>>> Anton<br>
>>><br>
>>><br>
>>> On Tue, Jul 1, 2014 at 8:50 PM, Danny Miller <<a href="mailto:dannym@austin.rr.com">dannym@austin.rr.com</a>><br>
>>> wrote:<br>
>>>><br>
>>>> It does work in moving. But signal problems do still make the position<br>
>>>> jump around, trees and buildings and an antenna's orientation changing can<br>
>>>> make an error happen. Antenna quality has a lot to do with that, too.<br>
>>>><br>
>>>> RTKLib requires a GPS with RAW pseudorange outputs. The NV08C is a<br>
>>>> good, cheap one to do it:<br>
>>>><br>
>>>> <a href="http://www.nvs-gnss.com/contacts.html" target="_blank">http://www.nvs-gnss.com/contacts.html</a><br>
>>>><br>
>>>> Contact your local sales rep there- it was actually easy in my<br>
>>>> experience to order a couple from them, and oddly cheaper than Newark<br>
>>>> element 14, as well as quicker to ship.<br>
>>>><br>
>>>> Danny<br>
>>>><br>
>>>><br>
>>>> On 7/1/2014 1:24 PM, Nick wrote:<br>
>>>><br>
>>>> Hello,<br>
>>>><br>
>>>> I am interested in getting an RTK GPS setup working for a moving<br>
>>>> vehicle, not fast, perhaps 10 mph. I would postprocess the data collected<br>
>>>> later, using data downloaded from a nearby station.<br>
>>>><br>
>>>> My desire is to log elevation data every few seconds as the vehicle<br>
>>>> drives. I hope to achieve 10-20 cm accuracy for the position and the<br>
>>>> elevation.<br>
>>>><br>
>>>> As I research RTKLIB, it seems like most information I come across is<br>
>>>> regarding a static location. Is my goal feasible to achieve this kind of<br>
>>>> accuracy as the vehicle moves?<br>
>>>><br>
>>>> If so, can anyone recommend a good board to get me started? I'm hoping<br>
>>>> to be able to do this for under $200 (just one receiver since the base<br>
>>>> station is public) -- please give me a reality check if this is unlikely.<br>
>>>> Thanks,<br>
>>>><br>
>>>> Nick<br>
>>>><br>
>>>><br>
>>>><br>
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