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Re:
From: |
Gary E. Miller |
Subject: |
Re: |
Date: |
Tue, 13 Apr 2021 12:34:42 -0700 |
Yo Massimiliano!
On Tue, 13 Apr 2021 21:15:30 +0200
Massimiliano Fago <massimiliano.fago@gmail.com> wrote:
> >
> > I expect indoors it needs to be near a window. But OK outside.
> >
>
> Yes, near the windows is ok, but sometime lost PPS signal. In my
> application it is in vertical position in a plastic box.
That is a problem. The antenna must point up, not to the side.
> Most of the time I use the system outdoors but an indoor event could
> happen.
If you are outside, and the antenna is pointing north, it may not see
enough satellites for a 3D fix.
> > "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.
>
> My system is based on raspberry pi
So a HAT works for you?
> > > 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.
>
> Ok, F variant I think is ok
The LEA-M8F is for controlling an external oscillator. Otherwise it
is overkill. It does have flash, for firmware updates and more, but I do
not expect any more updates to the 8-series.
The NEO-M8N is most common, and cheap.
> > > 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?
>
> Yes RS232 3.3V
Uh, RS-232 is +/- 12V. It is not 3.3V. Not the same. RS-232 will
blow up a RasPi.
> but not raspi hat, I need to integrate it on my PCB
> connecten as a raspi hat.
So you want a bar chip? Or bare chip on a carrier PCB?
> I'm in Italy and I need EU delivery.
> Sometime the shipping and import cost are prohibitive. I don't know
> where I can buy it in Europe.
Uputronics is Europe, but no longer EU. I don't know what is available
in EU. They make a nice NEO-M8Q for 27 Pounds:
https://store.uputronics.com/index.php?route=product/product&path=60_64&product_id=84
That is fine, as long as you do not need the external oscilator option.
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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- [no subject], Massimiliano Fago, 2021/04/06
- Re:, Gary E. Miller, 2021/04/06
- Re:, Massimiliano Fago, 2021/04/06
- Re:, Gary E. Miller, 2021/04/06
- Re:, Massimiliano Fago, 2021/04/13
- Re:, Gary E. Miller, 2021/04/13
- Re:, Massimiliano Fago, 2021/04/13
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Gary E. Miller <=
- Re:, Massimiliano Fago, 2021/04/14
- Re:, Gary E. Miller, 2021/04/14
- Re:, shouldbe q931, 2021/04/14
- Re:, Anthony Stirk, 2021/04/14
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