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Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY.
From: |
Eric S. Raymond |
Subject: |
Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY. |
Date: |
Tue, 22 Mar 2016 12:01:56 -0400 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
Hal Murray <address@hidden>:
>
> address@hidden said:
> > I looked into this possibility at one point and it turned out to be
> > uninteresting; the non-T variants already deliver more precision that WAN
> > time service can use, practically speaking, so the T variants would be
> > overengineering. They might be a good fit for PTP over a LAN.
>
> I'd expect the T variants to keep delivering accurate time with fewer
> satellites.
Good point. You are undoubtedly correct.
However, I note that while UBX chips are (deservedly) very popular
with maker types designing low-cost Stratum-1-in-in-a-box devices
(like the Laureline) not one of them has yet included the T variant.
So, either the T variant is just plain difficult to lay hands on or
the maker crowd has concluded that the T isn't cost-effective. Could
well be the latter - the vanilla UBX chips work very well indoors, much
better than SiRFs.
--
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
- [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Håkan Johansson, 2016/03/14
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Gary E. Miller, 2016/03/14
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Eric S. Raymond, 2016/03/20
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Hal Murray, 2016/03/20
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY.,
Eric S. Raymond <=
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Hal Murray, 2016/03/22
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Fred Wright, 2016/03/26
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Paul Fertser, 2016/03/27
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Fred Wright, 2016/03/27
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Håkan Johansson, 2016/03/20
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Eric S. Raymond, 2016/03/20
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Håkan Johansson, 2016/03/20
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Eric S. Raymond, 2016/03/22
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Håkan Johansson, 2016/03/22
- Re: [gpsd-dev] [PATCH] Using GOODTIME_IS for UBX_MODE_TMONLY., Eric S. Raymond, 2016/03/22