Message-ID: <5C1A5D4E.80300@posteo.de>
Date: Wed, 19 Dec 2018 16:01:34 +0100
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: LF: u-blox NEO-M8T timing GPS
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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
> -- 
>
>