You could also look at http://g4hup.com/DA/DA.htm - specifically the G version,
which is intended for just this application, feeding up to 4 receivers. I use
one myself for a Z3801A, two thunderbolts and a Jupiter based G3RUH type GPDSO.
Output level is individually settable if required, and
On 05/02/11 06:05, J. Forster wrote:
Hal,
This is not the first time this has happened. Apparently, when you sign up
for FB there is some non-obvious (purposely misleading, IMO) opt-out step
that prevents FB access to your Address Book. The default is full access.
The spam message will be
On 05/02/11 04:33, jimlux wrote:
On 2/4/11 1:18 PM, Magnus Danielson wrote:
On 02/02/11 19:47, Hal Murray wrote:
Bottom line - there's a lot to look into, and they are unlikely to
help you
out.
There are a lot of FPGAs used in DSP applications where the clock to the
front end ADC is
On 2/5/11 3:04 AM, Magnus Danielson wrote:
On 05/02/11 04:33, jimlux wrote:
On 2/4/11 1:18 PM, Magnus Danielson wrote:
On 02/02/11 19:47, Hal Murray wrote:
Bottom line - there's a lot to look into, and they are unlikely to
help you
out.
There are a lot of FPGAs used in DSP applications
On 05/02/11 12:13, jimlux wrote:
And where in-situ changes in the signal processing are needed (e.g. in a
software defined radio), the reprogrammable FPGA is a good fit. But
there is a tradeoff.. you might want to give the downstream
users/programmers the ability to change sample rates,
On 2/5/11 3:54 AM, Magnus Danielson wrote:
On 05/02/11 12:13, jimlux wrote:
And where in-situ changes in the signal processing are needed (e.g. in a
software defined radio), the reprogrammable FPGA is a good fit. But
there is a tradeoff.. you might want to give the downstream
users/programmers
Hi all,
I am unable to understand how to get this field from a RMC sentence, on
the GPS I am using (LS20031) the field is empy so I am wondering if this
is just a problem of implementation or what.
AFAIK, the data is highly variable (location and time) so how is the
GPS module able to
On 05/02/11 15:20, jimlux wrote:
I agree, but if you want the clock rate to be changeable/selectable,
driven arbitrarily by logic in the FPGA, you're kind of stuck.
There is always corner-cases. I quite intently left room for that as
well. The general recommendation is still to avoid it
Here's an interesting problem..
I've got a system at work with an internal clock oscillator that I want
to get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a convenient test point that I can probe.
I can divide it down by an arbitrary number to
In message 4d4d6bf6.8070...@earthlink.net, jimlux writes:
First, this isn't that different from the analysis used in the NTP
protocol, so you should read that with an open mind.
Or, given that the interval between ticks is one
of 28 or 29 discrete values
If you can reliably bin your
John K1AE wrote:
Once you install their small unobtrusive application
Yeah, right. If there's anything worse than facebook's privacy
practices, it's a service provider that requires you to download a
small unobtrusive application
Best regards,
Charles
On 2/5/11 7:30 AM, Poul-Henning Kamp wrote:
In message4d4d6bf6.8070...@earthlink.net, jimlux writes:
First, this isn't that different from the analysis used in the NTP
protocol, so you should read that with an open mind.
That is what got me started thinking it was doable at all.
(PTP 1588 as
On 05/02/11 16:25, jimlux wrote:
Here's an interesting problem..
I've got a system at work with an internal clock oscillator that I want
to get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a convenient test point that I can probe.
I can divide it down
On 2/5/11 8:05 AM, Charles P. Steinmetz wrote:
John K1AE wrote:
Once you install their small unobtrusive application
Yeah, right. If there's anything worse than facebook's privacy
practices, it's a service provider that requires you to download a
small unobtrusive application
The
On 2/5/11 8:11 AM, Magnus Danielson wrote:
On 05/02/11 16:25, jimlux wrote:
Here's an interesting problem..
I've got a system at work with an internal clock oscillator that I want
to get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a convenient test
Neque estis in ore equus dari.
Septuaginta tres,
Bill
On Sat, Feb 5, 2011 at 11:28 AM, jimlux jim...@earthlink.net wrote:
On 2/5/11 8:05 AM, Charles P. Steinmetz wrote:
John K1AE wrote:
Once you install their small unobtrusive application
Yeah, right. If there's anything worse than
Here is a contact in the Facebook abuse department:
Kirill Popov kpopo...@fb.com
-John
===
A good way to post photos etc is with Dropbox. You get 2 GB free. Once
you
install their small unobtrusive application, you can open the Dropbox
(online)
folder in Windows File
On 05/02/11 17:30, jimlux wrote:
On 2/5/11 8:11 AM, Magnus Danielson wrote:
What you can do is you generate your tick clock at any division greater
than 7*14 (if I understood the timing correctly). Say you divide your
clock with 200 (about 3 us period if I got it right). Then you would get
The GPS receiver can only compute the direction to true north if the
antenna is on a moving vehicle. The GPS looks backward to where you
were in the last few seconds and computers the direction of travel.
On a fixed antenna this can't work.
But even at best the GPS' idea of north is poor. I had
Garmin receivers provide that data in their RMC sentence. They
apparently calculate it automatically using a mathematical model of
the earth's magnetic field, so its accuracy would depend on the
accuracy of the model. The GPS system itself does not provide a way
to measure variation.
With the
Try this site as an alternative for local magnetic data
http://www.ngdc.noaa.gov/geomagmodels/IGRFWMM.jsp?defaultModel=WMM
Alan G3NYK
- Original Message -
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent:
I wonder if there is any value to performing a FFT on the data.
-GKH
Quoting jimlux jim...@earthlink.net:
Here's an interesting problem..
I've got a system at work with an internal clock oscillator that I want
to get some statistics on, but there's no direct visibility for the
oscillator,
Thanks to all for your answers. I am designing a low cost automagic
satellite dish pointer.
I was thinking that adding the magnetic compensation to the magnetic
compass would be neat, but obviously I can't get it from the internet,
still wondering how the GPS could provide a useful value if
but obviously I can't get it from the internet
Are you sure?
still wondering how the GPS could provide a useful value if the modeling is
difficult, varying widely in time and space.
If you ignore local quirks like big chunks of iron ore, the magnetic
declination is a set of smoothly
Are you sure?
I guess so, it is a motorhome traveling South and Central Europe without
Internet connectivity. Really how could Garmin and others provide such data? Do
they allow the user to upload the maps? Never heard about it, but I may be
wrong.
Giuseppe Marullo
Greetings TimeNuts
Does anyone know where I can find a manual for a HP 654A Distortion
Analyzer.
Thanks for any help.
Gordon WA4FJC
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-John
Greetings TimeNuts
Does anyone know where I can find a manual for a HP 654A Distortion
Analyzer.
Thanks for any help.
Gordon WA4FJC
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At 12:47 PM 2/5/2011, Chris Albertson wrote...
But magnetic variation can be can be gotten from a map...
Compensation would always need to be entered by hand.
Compensation? Please don't tell me they've changed things, and a great
mnemonic is no more. I learned it as
At 00:31 06-02-11, you wrote:
At 12:47 PM 2/5/2011, Chris Albertson wrote...
But magnetic variation can be can be gotten from a map..
e.g. http://www.intermagnet.org/apps/plt/dataplot_e.php?plot_type=dif_plot
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From: Gordon Batey gpba...@wildblue.net
Subject: [time-nuts] HP 654A Manual
Greetings TimeNuts
Does anyone know where I can find a manual for a HP 654A Distortion
Analyzer.
Thanks for any help.
Gordon WA4FJC
Gordon,
The HP 654A is a test oscillator (signal generator); not a distortion
That CVHD-950-100 looks to be just the ticket. Nice price/performance. Thank
you for the recommendation! :)
I just looked at the data sheet. It says:
Frequency Pulling: ±20ppm APR Min.
I was going to ask what APR meant. In case anybody else is also curious...
The CVS575-500 data
I've got a system at work with an internal clock oscillator that I want to
get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a convenient test point that I can probe.
...
Fun problem. Thanks for tossing it out.
I see two approaches. Are there
You don't feed the ADC from the FPGA if you can avoid it.
especially if your ADC clock is a different frequency from the processor
clock that's being used for most of the other logic on the FPGA. I'd
give a ballpark estimate of 20-30 dB isolation between the two on a
Virtex 2.
I read
Possibly you mean the CVS575 datasheet does not have any aging specs The
datasheet for the CVHD-950 specifies aging as 3ppm 1st/yr, 1ppm
thereafter which is good enough for me. So it's now on the shopping list.
No, what I meant was that the data sheets didn't have any total lifetime
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