Re:

[Gary E. Miller]

Yo Massimiliano!

On Tue, 13 Apr 2021 13:16:14 +0200
Massimiliano Fago <massimiliano.fago@gmail.com> wrote:

> Il giorno mar 6 apr 2021 alle ore 21:03 Gary E. Miller
> <gem@rellim.com> ha scritto:
> 
> Dear Gary
> 
> > Should be an easy upgrade.  A basic u-blox 8 with antenna, LNA,
> > etc.  
> 
> I am not really happy with this gps module. Obviously the antenna
> reception is not the best.

I expect indoors it needs to be near a window.  But OK outside.

> I am thinking of replacing it with an external antenna module and that
> it is suitable for timing.

"timing" covers a lot of ground.  If your host is a PC, then the best jitter
you can get will be on the order of 1 micro second.  You can get
to around 100 nano seconds on a RasPi.  The differences between the
F and T variants are less than that.

> What do you think of these two:
> LEA-M8F
> LEA-M8T

So not point in getting a "T" variant, unless you want some of the other
features, like RTCM, subframe data, or raw measurements.  Or use as
a frequency reference.

> or do you have other suggestions always staying on this price range,
> namely 60-70 dollars?

RS-232?  3.3V, as a RasPi HAT?  For EU or USA delivery?

In the USA, the Uputronics HAT is $45, and does raw:

https://v3.airspy.us/product/upu-rpi-gps-rtc/

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin

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