HI Tom,
got it. I was wondering because there is a 10MHz OCXO in the block diagram
as well.
bye,
Said
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and frequency measurement
Betreff: Re: [time-nuts] Best GPS 1PPS Accuracy
Ulrich,
+-3 sigma is 99% on a gaussian distribution.
If you want to look at other algorithms on this topic, here is one:
http://www.control.isy.liu.se/books/adfilt/
br,
Björn
On Thu, December 14, 2006 12:55
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Hal Murray
Sent: Thursday, December 14, 2006 2:50 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Best
In a message dated 12/14/2006 12:00:36 Pacific Standard Time,
[EMAIL PROTECTED] writes:
Hello Said,
from my own experience in detecting and removal of outliers i can asure
you that it is a challenging and ambitious task in statistical math. I
fear you expect too much from a receiver's
Said,
Based on what I have read from the Motorola side of things setting the
limits down that low will be problematic due to the constant threat of
spurious alarms. My concern would be that the good 1PPS time
accuracies might suffer if the receiver is constantly cycling. If the
software filters
I use TAC32 Plus with my Motorola M12+ receiver. You can set TRAIM
between 250 to 1000 nanoseconds. Default is 500 nS. I have had mine
set at 250 nS for years and have not noticed any problems - but, that is
a somewhat wide window.
Brian N4FMN
Randy Warner wrote:
Said,
Based on what I
: Re: [time-nuts] Best GPS 1PPS Accuracy
I use TAC32 Plus with my Motorola M12+ receiver. You can set TRAIM
between 250 to 1000 nanoseconds. Default is 500 nS. I have had mine
set at 250 nS for years and have not noticed any problems - but, that is
a somewhat wide window.
Brian N4FMN
Randy Warner
Hi Randy,
I will do a longer-term test with +-50ns setting. That should be interesting
:)
bye,
Said
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In a message dated 12/14/2006 16:46:10 Pacific Standard /tvb writes:
The beauty of a GPSDO is that you're only changing
the DAC every few minutes so there's plenty of time
to look carefully at the quality of your 1 Hz samples
before you commit the DAC update.
It would be a more
: Re: [time-nuts] Best GPS 1PPS Accuracy
In a message dated 12/14/2006 16:46:10 Pacific Standard /tvb writes:
The beauty of a GPSDO is that you're only changing
the DAC every few minutes so there's plenty of time
to look carefully at the quality of your 1 Hz samples
before you
Can someone explain the accuracy numbers that are represented in specs for GPS
receivers?
I find that Trimble says the Resolution T
(http://www.trimble.com/resolutiont.shtml) has 15 ns (1 Sigma) like the M12+.
So I guess the real question is; are you comparing apples to apples when the
, 2006 9:39 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Best GPS 1PPS Accuracy
One problem is that older GPS receiver spec sheets give numbers with SA
on, even though SA has been off for quite some time, so their numbers
will be inherently higher.
Probably
and frequency measurement'
Subject: Re: [time-nuts] Best GPS 1PPS Accuracy
Mit freundlichen Grüssen
Paul Klöckler
Coral links Gmbh
Postfach 6955
CH-3001 Bern
Schweiz
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Randy Warner
Sent: Mittwoch, 13
] On
Behalf Of [EMAIL PROTECTED]
Sent: Wednesday, December 13, 2006 4:56 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Best GPS 1PPS Accuracy
Hi guys,
slightly off-topic, but has anyone done stability tests with the m12+ or
M12M when the antenna goes bad in TRAIM-enabled mode (e.g. less than 4
good
Hi Randy,
as always, great info!
yes, please do send out the old VP TRAIM doc :)
thanks,
Said
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Many thanks for the long post!
You validated many of my concerns about the current state of amateur GPSDO's.
Thanks again,
Jack
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