Date: Thu, 20 Dec 2018 13:07:53 +0000
From: Chris Wilson <dead.fets@gmail.com>
Message-ID: <976743744.20181220130753@gmail.com>
To: DK7FC <rsgb_lf_group@blacksheep.org>
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References: <7dced87f-1e6e-0549-7693-2ebd0c19a630@abelian.org> <5C1A5D4E.80300@posteo.de>
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Subject: Re: LF: u-blox NEO-M8T timing GPS
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Hello Stefan

I have ordered one with the small breakout board and the lead, plus an
antenna  cable,  a lot derer than some of the basic units but at least
it's  from  a  known source and has all the bells and whistles. Thanks
for the link.

Wednesday, December 19, 2018, 3:01:34 PM, you wrote:

> Chris,

> See this older email from Paul.

> 73, Stefan

> Am 10.02.2018 21:33, schrieb Paul Nicholson:
>>
>> I've just started experimenting with a couple of NEO-M8T
>> boards.  It's the first time I've used the M8T.  It's designed
>> particularly for timing applications.
>>
>> It appears immediately impressive compared to the already good
>> NEO-7 series.   It's picking up a lot more satellites from
>> the poor antenna location on the window ledge.  It computes
>> a fix and time using GPS, GLONASS and Galileo networks!
>>
>> Just hooked one up to a Pi and stereo audioinjector card and
>> it's giving 21nS PPS jitter just with a breadboarded PPS
>> shaper on the bench.
>>
>> It has a mode of operation, which I've yet to try, where
>> it fixes its position and then concentrates on getting
>> accurate timing pulses.  I'm looking forward to firing that up,
>> on a good GPS antenna.
>>
>> It also has two independently programmable timepulse ouputs,
>> which I need for my LF receiver - a 2mS PPS pulse to time the
>> Octo sample rate, and a 103kHz local oscillator.
>>
>> Rather more expensive than the other u-blox GPS modules but it
>> looks worth it.
>>
>> My source is CSG shop, located in Latvia.  I've had two
>> deliveries so far from them with no problem.  Shipment can
>> take a while, took nearly a month for the first order but the
>> second was less than 10 days.  Tracking showed the first spent
>> a lot of time in Latvia post and then about a week in a
>> depot at Heathrow airport!
>>
>> I bought two models:
>>
>> First,
>>
>>  http://www.csgshop.com/product.php?id_product=218
>>
>> which also needs
>>
>>  http://www.csgshop.com/product.php?id_product=216
>>  http://www.csgshop.com/product.php?id_product=217
>>
>> plus a pigtail for the microscopic U.FL antenna connector, eg
>>
>>  https://www.amazon.co.uk/dp/B01LPXGJ2I/
>>
>> The other board is
>>
>>  http://www.csgshop.com/product.php?id_product=240
>>
>> which also needs a little breakout board
>>
>>  http://www.csgshop.com/product.php?id_product=239
>>
>> There is a third M8T board, product code 205 but this doesn't
>> appear to have the 2nd timepulse brought out.
>>
>> So far I'm well impressed.  Exchanged some emails with Aleks
>> Ivanovs who runs the shop.  Helpful, and he'll do custom boards
>> to whatever our requirements might be.  Worth a look at all
>> the other gadgets he supplies.
>>
>> The only other source I've found for M8T boards is u-blox
>> themselves with their very expensive evaluation board.
>>
>> -- 
>> Paul Nicholson
>> -- 
>>
>>


-- 
Best regards,
 Chris                            mailto:dead.fets@gmail.com