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<pre wrap="">where we used 23 meters of RG58,</pre>
</blockquote>
RG58 would be ill advised here (too much loss at L band)<br>
We use RG174 for moderately long runs and for temporary runs where
vehicle can damage the coax. <br>
It is thin and it is tough. <br>
<br>
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. <br>
<br>
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.<br>
<br>
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]<br>
<br>
Nick, is the link you provided below good?, seem to go to a page
with a small patch ant not plot results.<br>
<br>
<br>
Regards<br>
David Kelley<br>
<br>
<br>
<div class="moz-cite-prefix">On 7/1/2014 1:16 PM, Anton Strydom
wrote:<br>
</div>
<blockquote
cite="mid:CAFCwRd+1zP--3fLm3+WhstVsBKzZWoZn90wcLyk0orFjwRO6Kg@mail.gmail.com"
type="cite">
<pre wrap="">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 <a class="moz-txt-link-rfc2396E" href="mailto:oe.nick@gmail.com"><oe.nick@gmail.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">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]
<a class="moz-txt-link-freetext" href="http://dk.rs-online.com/web/p/smt-antenner/7239151/?searchTerm=SM-1575&relevancy-data=636F3D3226696E3D4931384E4B6E6F776E41734D504E266C753D6461266D6D3D6D61746368616C6C7061727469616C26706D3D5E5B5C707B4C7D5C707B4E647D2D2C2F255C2E5D2B2426706F3D313326736E3D592673743D4D414E5F504152545F4E554D4245522677633D424F5448267573743D534D2D3135373526">http://dk.rs-online.com/web/p/smt-antenner/7239151/?searchTerm=SM-1575&relevancy-data=636F3D3226696E3D4931384E4B6E6F776E41734D504E266C753D6461266D6D3D6D61746368616C6C7061727469616C26706D3D5E5B5C707B4C7D5C707B4E647D2D2C2F255C2E5D2B2426706F3D313326736E3D592673743D4D414E5F504152545F4E554D4245522677633D424F5448267573743D534D2D3135373526</a>
2014-07-01 21:38 GMT+02:00 Anton Strydom <a class="moz-txt-link-rfc2396E" href="mailto:agstrydom@gmail.com"><agstrydom@gmail.com></a>:
</pre>
<blockquote type="cite">
<pre wrap="">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
</pre>
</blockquote>
<pre wrap="">get
</pre>
<blockquote type="cite">
<pre wrap="">good results. For communication we use cellular routers connected to
</pre>
</blockquote>
<pre wrap="">Leica
</pre>
<blockquote type="cite">
<pre wrap="">GGO2 L1/L2 base or else we use 3D Robotics XBEE radios. On the roving
</pre>
</blockquote>
<pre wrap="">unit I
</pre>
<blockquote type="cite">
<pre wrap="">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 <a class="moz-txt-link-rfc2396E" href="mailto:oe.nick@gmail.com"><oe.nick@gmail.com></a>
</pre>
</blockquote>
<pre wrap="">wrote:
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">
Hi Anton
Really? You get by with that small patch antenna? Is that a good (green
</pre>
</blockquote>
</blockquote>
<pre wrap="">in
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">rtkplot) RTK solution you get from that constant?
Regards
Another Nick
Den 01/07/2014 21.11 skrev "Anton Strydom" <a class="moz-txt-link-rfc2396E" href="mailto:agstrydom@gmail.com"><agstrydom@gmail.com></a>:
</pre>
<blockquote type="cite">
<pre wrap="">Hi Nick
I have done a lot of testing with U-Blox LEA 6T at speeds of up to 120
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">km
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">/ h. Lat & Lon does not appear to be a problem but elevation is a
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">problem. I
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">paid the equivalent of $60 for the 2 receivers and ceramic patch
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">antennas.
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">
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
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">some
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">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 <a class="moz-txt-link-rfc2396E" href="mailto:dannym@austin.rr.com"><dannym@austin.rr.com></a>
wrote:
</pre>
<blockquote type="cite">
<pre wrap="">
It does work in moving. But signal problems do still make the
</pre>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">position
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">jump around, trees and buildings and an antenna's orientation
</pre>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">changing can
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">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:
<a class="moz-txt-link-freetext" href="http://www.nvs-gnss.com/contacts.html">http://www.nvs-gnss.com/contacts.html</a>
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
</pre>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">collected
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">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
</pre>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">of
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">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
</pre>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">unlikely.
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">Thanks,
Nick
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<pre class="moz-signature" cols="72">--
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)
<a class="moz-txt-link-rfc2396E" href="mailto:DavidKelley@ITSware.net"><DavidKelley@ITSware.net></a></pre>
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