Replies to This Discussion

Permalink Reply by Anthony Wooldridge on May 16, 2011 at 1:02pm

I have reverse engineered this board.

No need to take the unit off the board its a good useable board as it stands for serial i/o logic levels.

I have a fairly simple modification that will convert it to usb operation powered from usb.

A few track cuts and wire links and some tricky soldering.

Regards

Anthony

 

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Permalink Reply by Brandon J on June 3, 2011 at 3:17pm

Is that board from the eval kit? I am interested in obtaining a LEA-4T board....Where did you stumble upon that board?

Thanks!

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Permalink Reply by Anthony Wooldridge on June 4, 2011 at 1:30am

I have a supply of these.

They are almost certainly the circuit board used in the evaluation kit but I can't say for sure.

In any case they are equivalent in function. I can supply pinout and equivalent circuit information with them. If you buy the basic board from me I can supply details how to do the usb modification.

everything you need is on the board, antenna short circuit protection, backup capacitor ( although you might want to put a supercap there instead), voltage regulator for the LEA-4T chip. supply decoupling etc

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Permalink Reply by bruno schwander on June 19, 2012 at 4:04am

I also got one of those boards, would you mind sharing the pinout of the header connector ?

I would also be interested in the USB modification, do you have any insturctions or photos on how the mod is performed ?

Thanks

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Permalink Reply by jordan.erenrich on February 17, 2012 at 7:33am

HI, I just ordered a board that looks exactly like this. Do you know what type of antenna connector it has? Thanks

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Permalink Reply by Anthony Wooldridge on February 18, 2012 at 4:34am

My board has an SMB male connector.

If you purchase through me I can supply unlimited assistance in reverse engineering, connecting to usb, setup commands RTKlib, best antennae, use of choke rings etc.

I can also supply the board modified to run direct off usb (signal plus power)

I can also supply the antenna, antenna cables and choke rings.

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Permalink Reply by W. D. Michael on March 3, 2012 at 9:20am

Anthony - Thanks for your help last summer with these cards.  I've been very successful and need additional boards.  Can you provide a list of what you offer and, if possible, a price list.

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Permalink Reply by W. D. Michael on March 3, 2012 at 9:19am

Jordan -

 

Anthony is a great source of information on these boards.  With his help, I have put a couple on Sparkfun serial - USB cards.  It kind of hurts my head to pull serial i/o off the board and convert it to USB when the board will do it without the card but I already had the cards and couldn't justify buying more.

 

FYI - the board works great and provides excellent RTK results.

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Permalink Reply by Brandon J on March 10, 2012 at 11:12am

W.D.-

What type of antenna are you using with your boards to get good RTK resuts?

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Permalink Reply by W. D. Michael on March 22, 2012 at 7:24pm

Sorry, Vast - didn't see this until now.  I'm using GPS 53335 L1 antennae.  Works great!

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DeveloperPermalink Reply by Michael Oborne on September 22, 2012 at 1:05am

just a fyi for others searching this

 
 antenna - SMB male connector
 2 4 6 8
 1 3 5 7
 bottom
 
 1 antenna vcc
 2 vcc
 3 tx
 4
 5 rx
 6 timepulse
 7
 8 gnd

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Permalink Reply by Napoleon on February 23, 2013 at 10:50am

i ordered that board as well from china but havent received it yet. i guess that with an ftdi cable and the drivers from the ublox site i ll be ok to connect them to u centre on windows or i missed somethind?

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