To: rsgb_lf_group@blacksheep.org
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 <5C1A5D4E.80300@posteo.de> <976743744.20181220130753@gmail.com>
From: N1BUG <paul@n1bug.com>
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Message-ID: <c7bda82c-9658-9289-0307-525125e96b81@n1bug.com>
Date: Thu, 20 Dec 2018 08:38:21 -0500
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In-Reply-To: <976743744.20181220130753@gmail.com>
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Subject: Re: LF: u-blox NEO-M8T timing GPS
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Reply-To: rsgb_lf_group@blacksheep.org

Hello Stefan,

Thanks also from me for re-posting this email. I don't see much
difference (or don't understand the difference) between the first
option and the second except for physical properties. The first
option is perhaps a bit more flexible in packaging and mounting.

It is good to know a reliable source of genuine M8T modules. I put
one on my wish list, hope next month or so I can order it.

73,
Paul

On 12/20/18 8:07 AM, Chris Wilson wrote:
> 
> 
> 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