[time-nuts] Cheap LEA-6T [was: Re: Precise Time transfer and relative position over ashort baseline]

Mike Cook michael.cook at sfr.fr
Tue Apr 12 07:39:12 UTC 2016


I tried one of these back in 2014 and found it not hitting specs. 2.16V on 1PPS instead of 3.3V. It died after a few months. Your milage may be better, but they are are old versions so there may be a systemic issue. 


> Le 11 avr. 2016 à 20:47, Scott Newell <newell+timenuts at n5tnl.com> a écrit :
> 
> At 11:46 AM 4/11/2016, Tom Van Baak wrote:
>> Another way might be to use single-channel common view GPS. I've not checked recently to see if 100 ps is possible over a 1 km baseline. If so that would be a less expensive solution. Someone should dig into the RINEX mode of the ublox 6T. It's on my list but the list is long.
> 
> BTW, there are some LEA-6T modules (with patch antenna, compass, 1PPS led, and USB connector) intended for drone autopilot use on eBay for around $30 shipped from China. (Search for "LEA-6T".) Mine showed up on the day of my lightning strike, so I've barely played with it. It has the 6.something ROM, connects to u-center, and appears to output the +/-10 ns sawtooth error correction message and the RTKLIB compatible raw data.
> 
> "Gyro" on thr eevblog forum reverse engineered part of the schematic:
> 
> http://www.eevblog.com/forum/projects/ebay-u-blox-lea-6t-gps-module-teardown-and-initial-test/
> 
> 
> -- 
> newell  N5TNL
> 
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