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Re: [gpsd-users] Acquiring a Navisys GR[67]01W (was: GR-301W)
From: |
Thomas P. |
Subject: |
Re: [gpsd-users] Acquiring a Navisys GR[67]01W (was: GR-301W) |
Date: |
Wed, 19 Nov 2014 21:31:30 +0100 |
User-agent: |
KMail/4.13.3 (Linux/3.13.0-39-generic; KDE/4.13.3; x86_64; ; ) |
Hi,
On Wednesday 19 November 2014 12:05:42 Gary E. Miller wrote:
> My experience says otherwise. I find the uBlox6 and SiRF III have no
> trouble in most buildings I am in. And not on the edge, quite strong.
> I do agree that steel and/or tall building are very hard on a GPS
> signal, but that is not something I often see.
Maybe a difference between Europe and US. Here you will hardly find any
buildings where it works and even trough modern windows its hard.
> > But I would not expect, 1dB more or less sensitivity such a chipset
> > version has more or less would make a difference. (And newer chipsets
> > typically have better sensitivity than olders)
>
> My experience says otherwise. Many of the newest GPS chips have
> emphasized power saings over receiver sensitivity. Way more than dB.
> For example, I find the SiRF IV to perform very poorly compared to the
> SiRF III.
What I quickly can find:
Sirfstar3 -159dBm sensitivity
(http://www.globalsources.com/gsol/I/GPS-module/p/sm/1025755241.htm#1025755241)
Sirfstar4 -163dBm sensitivity (http://www.csr.com/products/35/sirfstariv-gsd4e)
Well, this numbers say at least, but should be in a theoretic scenario equal,
with a tendency the SS4 is a bit better.
However, such a difference could be easily overridden by poor antenna/PCB
design, choosing a cheaper LNA etc.
Also other effects like fading or spur tones might harm the one or other
receiver more or less. Could be again that e.g. somebody uses a cheaper filter
after the antenna.
Kind regards,
Thomas
- Re: [gpsd-users] Acquiring a Navisys GR[67]01W (was: GR-301W), Gary E. Miller, 2014/11/18
- Message not available
- Re: [gpsd-users] Acquiring a Navisys GR[67]01W (was: GR-301W), Gary E. Miller, 2014/11/19
- Re: [gpsd-users] Acquiring a Navisys GR[67]01W (was: GR-301W), Thomas P., 2014/11/19
- Re: [gpsd-users] Acquiring a Navisys GR[67]01W (was: GR-301W), Gary E. Miller, 2014/11/19
- Re: [gpsd-users] Acquiring a Navisys GR[67]01W, Greg Troxel, 2014/11/19
- Re: [gpsd-users] Acquiring a Navisys GR[67]01W (was: GR-301W), Gerry Creager - NOAA Affiliate, 2014/11/19
- Re: [gpsd-users] Acquiring a Navisys GR[67]01W (was: GR-301W),
Thomas P. <=
- Re: [gpsd-users] Acquiring a Navisys GR[67]01W (was: GR-301W), Gerry Creager - NOAA Affiliate, 2014/11/19