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

[Brenton Hewitt]

i have noticed alot of the ublox modules on aliexpress are cheaper versions of the same chip they are trying to sell, so same revision cheaper spec, also the classic QR code serial number of 12345678 is very common, 
this is trying to find max-7q models not the lea-6t though

the fun of trying to make your own hobby beaglebone capes without ordering mass bulk product i guess

this one has the fake sticker ontop too


Brenton

> On 13 Apr 2016, at 7:44 AM, Dimitri.p <dimitri at dotp.com> wrote:
> 
> They are using LEA-6T0-000
> My 6T-0-000 reports
> Software version 6.02(36023) and hardware version 00040007 in the UBX MON (Monitor) VER (Version)
> 
> In the datasheet there is no 6T0-0-000  but there is a 6T-2-000 with 6.2 FW.
> LEA-6T
> LEA-6T-0-001  ROM7.03
> LEA-6T-1-001  FW7.03
> LEA-6T-2-000  FW6.02
> 
> But not bad for less than 30 bucks
> 
> Dimitri
> 
> 
> 
> At 02:26 PM 4/12/2016, Attila Kinali wrote:
>> On Mon, 11 Apr 2016 13:47:36 -0500
>> Scott Newell <newell+timenuts at n5tnl.com> wrote:
>> 
>> > 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.
>> 
>> There is something strange with these. For one thing, they are way too
>> cheap. LEA-6T is still quite expensive when bought from u-blox directly,
>> eventhough it came down from 180eur/pcs to 140eur. The prices these
>> modules are selling are lower than the cheapest price i've ever seen
>> for LEA-6T's, when bought in the 100s. So, either they bought them in
>> swats of 10k or there is something amis...
>> 
>> Also, why would anyone use LEA-6T in navigation module? That does
>> not make sense. The power of the LEA-6T is as a timing module, not
>> for navigation.
>> 
>> And last, but not least, the pictures seem wrong. All the LEA modules
>> i've seen, had two shield covers, one over the RF part and one over
>> the digital part. Yet these shown in the pictures have only a single
>> shiled. It might be that u-blox decided to use a single shield
>> for them... though it would seem strange to do that to an already launched
>> product that sells in relatively low volumes. Even more so, as I know
>> that u-blox itself warned users of their modules to ensure an electrically
>> quite enviornment around their modules, for maximum performance.
>> 
>> 
>> So, i would warn people buying those that they might be fakes...
>> 
>> 
>>                        Attila Kinali
>> --
>> Reading can seriously damage your ignorance.
>>                -- unknown
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