Well Jim brought up cars,
I did look at using a GPS as a speed sensor for a car some time ago. The
1000kPH limit (and 1s update rate) stopped that idea. The car finally hit over
1227kph average. We used wheel speed and pitot pressure in the end (plus
external time distance).
Robert G8RPI
Date: Thu, 1 Oct 2009 23:13:33 -0400
From: David I. Emery d...@dieconsulting.com
Subject: Re: [time-nuts] GPS from a window seat
I never had anyone from the airline bother me about doing this
(discretely) UNTIL a recent flight this August from Boston to
London Heathrow on American ...
In message fad0f39d8fa7f440861941a74b1ae560364...@sbsserver.aremv.local, Dav
e Baxter writes:
Tests were done a few years ago at London Gatwick, LGW (on the ground)
to see what impact (if any) the use of a cellphone had when used inside
a commercial pasenger aircraft.
I think the only documented
Amen to your last paragraph.
Roy
- Original Message -
From: Poul-Henning Kamp p...@phk.freebsd.dk
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, October 02, 2009 9:34 AM
Subject: Re: [time-nuts] [OT] GPS from a window seat
In message
Hi Robert,
The limit is 515 m/s, 1000 knots or 1854 km/h. I presume your car did 1227
km/h, right? This is within CoCom limits. Then both altitude AND speed
must be over the limit to break the rules. Where your car also driving
over 18000m altitude?
Hi Bjorn,
The car was Thrust-SSC, Design phase was late 1995, running 1996/7. We were
limited on funds too. One unit we looked at was the Rockwell Jupiter, I just
looked at the spec and can't see a speed limitation, but it was a problem at
the time. Dispite the stories that it was a well funded
A couple of months ago I did announce that I plan to build a dual Mixer
based on the NBS design with minor updates and add a counter section. All with
a cost goal of $ 200. Having all parts in house the goal has been reached
when boards get ordered in quantity ten. Thanks to inputs from
On 10/1/09 11:49 PM, Robert Atkinson robert8...@yahoo.co.uk wrote:
Well Jim brought up cars,
I did look at using a GPS as a speed sensor for a car some time ago. The
1000kPH limit (and 1s update rate) stopped that idea. The car finally hit over
1227kph average. We used wheel speed and
Hi Bert,
This is amazing and i hope that you can make it available for us to build
one. I am very interested.
regards,
Henk
A couple of months ago I did announce that I plan to build a dual Mixer
based on the NBS design with minor updates and add a counter section. All
with
a cost goal of
Henk, it will be available to every one the challenge will be buying in
groups, I definitely do not want to be in the mail order business. Bert
In a message dated 10/2/2009 10:11:49 A.M. Eastern Daylight Time,
h...@deriesp.demon.nl writes:
Hi Bert,
This is amazing and I hope that you
I am looking for a GPS receiver to provide high accuracy, low jitter timing
pulses in my lab. I have found an Ashtech Z-Sensor for sale but cannot
readily determine from the spec sheets how it compares to the Ashtech Z-12
in terms of position and timing accuracy when used as a static, standalone
Hello,
Will exisitng GPS receivers (Motorola M12M for example) be able to work with
the new Galileo system when it comes on line.
I know the systems are compatible, but not sure about older GPS receivers.
Any help appreciated
Martyn
___
Hi Martyn,
No. You will need a new GNSS receiver for Galileo usage.
--
Björn
Hello,
Will exisitng GPS receivers (Motorola M12M for example) be able to work
with the new Galileo system when it comes on line.
I know the systems are compatible, but not sure about older GPS receivers.
Hi Martyn,
not the M12M/M12+.
Some receivers such as those from uBlox already have the hardware, and
will only require a firmware update to work according to the manufacturer.
bye,
Said
In a message dated 10/2/2009 10:11:40 Pacific Daylight Time,
mar...@ptsyst.com writes:
Hello,
Martyn,
Martyn Smith wrote:
Hello,
Will exisitng GPS receivers (Motorola M12M for example) be able to work
with the new Galileo system when it comes on line.
I know the systems are compatible, but not sure about older GPS receivers.
Simple answer: No.
Little longer answer:
Most existing
Hi Alain
I can't help with the differences in the PSUs, there is little you can tell
by looking at the unit. I wonder if it might be easier to run the OCXO from
a new additional supply housed in the unit, there appears to be space for
this (?) and feed the 10MHz into the external REF I/P? There
Hi
One easy way to get the eprom fail message on the 53132 is to write
settings to memory a bit to often. I blew out a set of them in under a
year back when they first came out...
They still worked fine, but they did come up with the error at boot. I
suspect that they also did not quite save
WarrenS wrote:
I have been using a simple low cost, high performance alternate solution to
the standard Dual Mixer/DMTD.
The idea is based on an analog version of NIST's Tight Phase-Lock Loop
Method of measuring Freq stability.
http://tf.nist.gov/phase/Properties/one.htm#oneone fig
Mark wrote:
Apparently many of the boxes use the same source code that has an uncanny
knack for choosing the worst possible source for their time...
Dave wrote:
I think the likely explanation of the recent time problem with
converter boxes in the midwest is some common piece of software and/or
Bruce
Yes, there are a few disadvantages using this simple low cost configuration
along with all of its advantages.
You can not get everything for nothing, but you can get higher speed, better
resolution and less noise from this.
This can not be used to evaluate the stability of an offset
WarrenS wrote:
Bruce
Yes, there are a few disadvantages using this simple low cost
configuration
along with all of its advantages.
You can not get everything for nothing, but you can get higher speed,
better
resolution and less noise from this.
This can not be used to evaluate the
Hello,
Thanks Bj?rn, Magnus and Said for the input.
That's another upgrade I'll (not) look forward to.
Martyn
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow
Martyn,
Martyn Smith wrote:
Hello,
Thanks Bj?rn, Magnus and Said for the input.
That's another upgrade I'll (not) look forward to.
You will not have to make the upgrade, it is only if you want the added
benefit of multiple constellations.
The current GPS/GLONASS constellation issues is
ws Reply to Bruce
You also need to measure the EFC slope at the operating point as the EFC
transfer characteristic can be highly nonlinear.
Yes there is lots of things that can be done wrong but
Another one of this configuration's many advantages is that the operating
range of both the EFC
WarrenS wrote:
ws Reply to Bruce
You also need to measure the EFC slope at the operating point as the EFC
transfer characteristic can be highly nonlinear.
Yes there is lots of things that can be done wrong but
Another one of this configuration's many advantages is that the
On 1 October AL1 wrote:
i would upgrade my 53132 with an OCXO 10811, i have the module, but i was told i
have to change the power supply too.
It's yet the original HP 0950-2496 from Delta, model : DPS-43DL-2 (47 Watts).
That's the same supply in my 53132A and at least one of my
Hi Bill,
I've done this a few times, with mixed success, using an AMOD AGL3080 GPS
data logger. I managed to capture an entire flight from HKG to SFO. That
was from a South facing window seat. One thing to watch out for is getting
a good solid lock on the ground (e.g. in the boarding lounge)
ws reply to Bruce's comments
That calibration is linear over than a 1 Hz (1e-7) offset range.
Whilst that may be true for your OCXO, this is certainly
not true for every ocxo one may wish to measure.
It is not the measured OSC that needs to be linear,
but the reference Osc, but I'm sure
28 matches
Mail list logo
