Here are ADEV plots and interesting results from a recent
experiment on varying the time-constant of a GPSDO:
http://www.leapsecond.com/pages/tbolt-tc/
There was a thread recently where Warren suggested that the
loop time constant (TC) of GPSDO was less than ideal. He is
correct. There are a
In message b6f04190894a41eeaae0305a898a5...@pc52, Tom Van Baak writes:
Here are ADEV plots and interesting results from a recent
experiment on varying the time-constant of a GPSDO:
http://www.leapsecond.com/pages/tbolt-tc/
Tom, part of the reason for the sub-optimally short default time
constant
Tom Van Baak skrev:
Here are ADEV plots and interesting results from a recent
experiment on varying the time-constant of a GPSDO:
http://www.leapsecond.com/pages/tbolt-tc/
There was a thread recently where Warren suggested that the
loop time constant (TC) of GPSDO was less than ideal. He
Hej Magnus
Magnus Danielson wrote:
Tom Van Baak skrev:
Here are ADEV plots and interesting results from a recent
experiment on varying the time-constant of a GPSDO:
http://www.leapsecond.com/pages/tbolt-tc/
There was a thread recently where Warren suggested that the
loop time constant
Poul-Henning Kamp skrev:
In message b6f04190894a41eeaae0305a898a5...@pc52, Tom Van Baak writes:
Here are ADEV plots and interesting results from a recent
experiment on varying the time-constant of a GPSDO:
http://www.leapsecond.com/pages/tbolt-tc/
Tom, part of the reason for the
Hej Bruce,
The good news is that if you, the time-nut, have the gear and
the time to measure the stability of the OCXO in your GPSDO,
and know your environment well, then you can probably safely
lengthen the TC and achieve much better mid-term stability out
of your GPSDO as shown in the plot
In message 4965dece.3060...@xtra.co.nz, Bruce Griffiths writes:
Hej Magnus
Magnus Danielson wrote:
How exactly can one measure the resultant performance or even select the
optimum time constant and damping factor if one doesn't have a quieter
reference?
Can one really resort to some sort of N
Poul-Henning Kamp skrev:
In message 4965dc62.9070...@rubidium.dyndns.org, Magnus Danielson writes:
In a lab setting, it makes sense to increase over the default
time-constant, just remember that it impacts your loops ability
to cope with for instance a 2g turnover.
Most labs would have
In message 4965e869.4090...@rubidium.dyndns.org, Magnus Danielson writes:
Ericsson created a rack system in which the bottom of the rack
was actually forming a closed container with the floor.
We had that at one place I worked, except it was two small dogs you
attached front and back a
Hi Magnus,
all depends - in an aircraft you have 6g+ turn-overs :)
We make a version of our FireFly-II GPSDO with ultra-low-g sensitivity and
ruggedization, that one you can run in a back-pack while doing skating-tricks
on a ramp and you won't see much change in frequency. A bit more
I mentioned in another post that I picked up a couple of militarized
FTS-4100 fly-away Cs units. These have an option installed that adds
an accelerometer to the OCXO; it's supposed to reduce G sensitivity by
at least an order of magnitude.
John
saidj...@aol.com wrote:
Hi Magnus,
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson
Sent: Thursday, January 08, 2009 9:51 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPSDO time constant
Hi Brooke,
So you
Poul-Henning Kamp skrev:
In message 4965e869.4090...@rubidium.dyndns.org, Magnus Danielson writes:
Ericsson created a rack system in which the bottom of the rack
was actually forming a closed container with the floor.
We had that at one place I worked, except it was two small dogs you
Lux, James P skrev:
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson
Sent: Thursday, January 08, 2009 9:51 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPSDO time constant
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson
Sent: Thursday, January 08, 2009 11:19 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPSDO time constant
Poul-Henning Kamp
Lux, James P wrote:
When I worked in the special effects business, we used to use these
all the time to move heavy stuff around. It actually doesn't
require a real flat floor (1 cm grooves aren't a big issue).
Think about them as small hovercraft. It also doesn't take much
On Thu, Jan 8, 2009 at 11:36 AM, WB6BNQ wb6...@cox.net wrote:
Do you have any web sites that show such a contration using leaf
blowers ?
mythbusters
--
GDB has a 'break' feature; why doesn't it have 'fix' too?
___
time-nuts mailing list --
Google Leaf blower hovercraft and you'll get dozens of useful hits.
Here's a real old link: http://amasci.com/amateur/hovercft.html
-Original Message-
James,
Do you have any web sites that show such a contration using leaf
blowers ?
thanks,
BillWB6BNQ
In the world of precision scales you can often beat the many of the
manufactures specs by an order of magnitude by adjusting and calibrating the
scale in the exact location and orientation where it will be used (and not
moving it or afterwards). Some of the adjustments involve moving rather
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