On Sat, 01 Jul 2006 07:43:36 +0200 (CEST), Magnus Danielson
<[EMAIL PROTECTED]> wrote:
>Never the less I live in a
>house which have "earthquake damages", but if you live in the homecountry of
>Alfred Nobel, you have to accept that they use alot of dynamite when rebuilding
>the local center.
I wa
From: "Tom Van Baak" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Relationship of relative stability between
distantlocations using GPS and environmental factors
Date: Fri, 30 Jun 2006 15:07:53 -0700
Message-ID: <[EMAIL PROTECTED]>
> And don't forget earthquakes. The last one near here,
> in 2001
Christopher Hoover wrote:
>> For me the catch seems to be that they are packaged in a QFN-32.
>> The pin spacing is 500 microns and the open space between the
>> solder pads is only 200 microns. Perhaps I am too timid but this
>> sounds like trouble for manual soldering, that's assuming the low
>
Randy Warner wrote:
> P.S. I hope I never have to do this with lead-free solder.
You and me both. The wetability of some of the ROHS parts is bad
enough.
-ch
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> For me the catch seems to be that they are packaged in a QFN-32.
> The pin spacing is 500 microns and the open space between the
> solder pads is only 200 microns. Perhaps I am too timid but this
> sounds like trouble for manual soldering, that's assuming the low
> cost PCB suppliers could mak
Poul-Henning Kamp wrote:
> In message <[EMAIL PROTECTED]>, Magnus Danielson writ
> es:
>
>
>>Eh... well, not the antenna. :O) That you stick onto a temperature-stabilzed
>>concrete piller built onto the stable rock.
>
>
> At this point Magnus forgot to say: "You stop continental drift and ..."
Hi Brooks:
I too got the quote on the GP2 and checked the ExpressPCB software
package that does both schematic capture and board layout and it has a
template for the QFN32 package. For comparison I placed the ICS525
template right beside the QFN32. The ICS525 has 1/4 pitch (0.025") but
the Q
Hi Brooks,
another technique that works well with a bit of practice (hopefully not on
$28 parts...) is to use a heat gun:
You can get a heat gun for soldering online for <$30, or buy one at Home
depot (paint stripper heat gun - be sure to get one with temp control!).
Wet the PCB pads with
> > >Eh... well, not the antenna. :O) That you stick onto a
temperature-stabilzed
> > >concrete piller built onto the stable rock.
> >
> > At this point Magnus forgot to say: "You stop continental drift and ..."
> >
> > :-)
>
> Ah, thanks for reminding me... ;O) It's a bit hot here this evening. ;O
Brooks,
QFN's aren't that bad (you ought to try 0201 SMDs. Like soldering
dust. QFN's are tight, but with a little technique they solder pretty
easily. I am using a little QFN28 for the CP2102 USB-to-serial converter
on my new FC Oncore Eval Board design. There are a couple of tricks I
have fo
Inspired by Ulrich's lead regarding the high resolution TDC, I asked the
Acam US rep for a quote on the TDC GP2. As Ulrich indicated they are not too
expensive: $28 quantity 1, $26 quantity 10. Sounds great. Temperature
coefficient isn't quoted but it will be considerable - presumably can be
From: [EMAIL PROTECTED]
Subject: Re: [time-nuts] Some results of PRS10 and Trimble Resolution
Date: Fri, 30 Jun 2006 22:10:42 +0200 (CEST)
Message-ID: <[EMAIL PROTECTED]>
> On Fri, June 30, 2006 20:49, Brooke Clarke said:
> > Hi Björn:
> >
> > I don't think that's that case. I live in a small tow
From: "Poul-Henning Kamp" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Relationship of relative stability between distant
locations using GPS and environmental factors
Date: Fri, 30 Jun 2006 20:06:18 +
Message-ID: <[EMAIL PROTECTED]>
> In message <[EMAIL PROTECTED]>, Magnus Danielson writ
> e
On Fri, June 30, 2006 20:49, Brooke Clarke said:
> Hi Björn:
>
> I don't think that's that case. I live in a small town and hired a
> local surveyor chosen because he's the guy that uses GPS.
Maybe I was wrong with extrapolating the local situation to a global level.
With the present dense networ
In message <[EMAIL PROTECTED]>, Magnus Danielson writ
es:
>Eh... well, not the antenna. :O) That you stick onto a temperature-stabilzed
>concrete piller built onto the stable rock.
At this point Magnus forgot to say: "You stop continental drift and ..."
:-)
--
Poul-Henning Kamp | UNIX si
From: David Andersen <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Relationship of relative stability between distant
locations using GPS and environmental factors
Date: Fri, 30 Jun 2006 15:31:11 -0400
Message-ID: <[EMAIL PROTECTED]>
David,
> Also, note that you don't really need dual-frequency f
On Fri, June 30, 2006 21:20, Magnus Danielson said:
> From: "Stephan Sandenbergh" <[EMAIL PROTECTED]>
> Subject: [time-nuts] Relationship of relative stability between distant
> locations using GPS and environmental factors
> Date: Fri, 30 Jun 2006 14:36:30 +0200
[snip]
>> Can anyone point me to s
On Jun 30, 2006, at 3:20 PM, Magnus Danielson wrote:
From: "Stephan Sandenbergh" <[EMAIL PROTECTED]>
Subject: [time-nuts] Relationship of relative stability between
distant locations using GPS and environmental factors
Date: Fri, 30 Jun 2006 14:36:30 +0200
Message-ID: <[EMAIL PROTECTED]>
H
From: "Stephan Sandenbergh" <[EMAIL PROTECTED]>
Subject: [time-nuts] Relationship of relative stability between distant
locations using GPS and environmental factors
Date: Fri, 30 Jun 2006 14:36:30 +0200
Message-ID: <[EMAIL PROTECTED]>
> Hi,
Hi Stephan,
> A number of recent entries to this list
Hi Björn:
I don't think that's that case. I live in a small town and hired a
local surveyor chosen because he's the guy that uses GPS.
He was able to use two GPS receivers separated by say 100 feet and
connected with a cable to determine an accurate relative bearing between
his total station a
> Hello Tom,
>
> I had a conversation with Sam S. from TSC the
> other day, and he said that it's probably not
> possible to get <10ns GPS accuracy anyways
> due to the multipath issues, Ionospheric issues,
> antenna survey issues, thermal issues etc.
Yes, with a standard GPS receiver or GPSDO, I
> Hi,
>
> A number of recent entries to this list have mentioned topics relating to
> GPS timing and environmental corrupting factors (e.g. Ionosphere, Temp.,
> Humidity, etc.). Personally, I am very interested in setting up a very
> precise relative time between locations (maybe 100s of meters to
On Fri, June 30, 2006 7:44, Tom Van Baak said:
>> Why are dual freq. receivers not used in timing instruments? Ionospheric
>
> They are. But only in the high-end instruments.
>
>> errors are almost removed. Surveyors in every small town on earth are
>> routinely getting sub 5cm accuracy in real tim
From: "Stephan Sandenbergh" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Linear Interpolator
Date: Fri, 30 Jun 2006 14:02:11 +0200
Message-ID: <[EMAIL PROTECTED]>
> Hi Ulrich,
Stephan,
> Thanks for the tip. And, also many thanks to Magnus for introducing me to
> the concept of Time-to-Digital co
Hi,
A number of recent entries to this list have mentioned topics relating to
GPS timing and environmental corrupting factors (e.g. Ionosphere, Temp.,
Humidity, etc.). Personally, I am very interested in setting up a very
precise relative time between locations (maybe 100s of meters to 10s of
kilo
Hi Ulrich,
Thanks for the tip. And, also many thanks to Magnus for introducing me to
the concept of Time-to-Digital conversion. It is a brilliant and yet so
simple technique. (Until yesterday, I blissfully believed that a fast
clocking counter was one's best bet.)
Accordingly, I did a bit of res
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