What's metric or Common Measure about seconds? ;)
Bob
On Tue, Dec 13, 2011 at 11:47 AM, Don Latham d...@montana.com wrote:
Ah yes, God's units as revealed by the French. :-)my mistake
Don
Jim Palfreyman
Gentlemen, gentlemen and gentlemen!
We are time-nuts. Accuracy is paramount. We are
Paul Wade did a paper on 10Mhz GPSDO filtering for Microwave Update in
October. It is in the proceedings. I don't know if it is available
elsewhere.
Bob
On Mon, Dec 12, 2011 at 9:17 PM, li...@lazygranch.com wrote:
I think you would want to avoid crystal filters due to microphonics.
I've
Much to my amazement, this morning I discovered that the State of New
York, where I live, has their own Metrology lab less than a mile from
my office. And are building a new lab.
http://alloveralbany.com/archive/2011/12/07/that-building-going-up-on-the-state-campus-along-w#more
And to my
Ayup. For some definition of precision at least. :)
On Wed, Dec 7, 2011 at 11:26 AM, Jim Lux jim...@earthlink.net wrote:
On 12/7/11 8:18 AM, Bob Bownes wrote:
Much to my amazement, this morning I discovered that the State of New
York, where I live, has their own Metrology lab less than
Keep in mind that a common view or LOS light method will have a
problem with the variability of the medium density along the path
being unknown.
You could do it in a vacuum however.
I come back to the base question of 'since the speed of light varies
depending on the medium, does the speed of the
Right. The fixed location apps are not all that hard. But the mobile
ones are going to be a big problem.
Not to mention getting them certified for the application. The GPS you
have in your car is not certified for life critical applications. The
one I have in my ambulance is. And let's not even
Exactly. The narrower the filter, the more it will cost. In general.
On Fri, Sep 30, 2011 at 11:10 AM, Tom Holmes thol...@woh.rr.com wrote:
Sticking with the intent to keep this non-political, what good is a filter
if the offending signal is within the necessary passband?
Tom Holmes, N8ZM
As always, the answer is 'it depends'. :)
Solid rock? Liquid rock? Gaseous rock? Plasma? :)
Wavelength?
A nice light rock like calcite it probably isn't too tough to measure.
Si02 is pretty easy too, I'm sure.
For classic basaltic or feldspathic rocks, I suspect you are going to
need something
The simplest method of all would be to put one on the X axis and one
on the Y axis of an o-scope.
What levels of precision/accuracy are you looking for?
On Wed, Sep 7, 2011 at 11:36 PM, Ilja Gerhardt i...@cryptix.de wrote:
Hi time nuts -
I am new to the list and have a trivial question on the
There are a number of kits available on ebay and other places.
Bob
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Nice summary:
“In the end, the laws of physics won out.”
On Thu, Jul 7, 2011 at 1:57 PM, Pete Lancashire p...@petelancashire.com wrote:
http://www.gpsworld.com/gnss-system/news/final-report-fcc-working-group-lose-lightsquared-l-band-11848
___
A while ago I was asking if anyone had a dist amp for 10mhz and many
suggested looking for video distribution amps. (and a few offered up
real 50ohm 10mhz dist amps, and I thank you!)
To make a long story short, I found a set of 3 VideoTek VDA-16's in a
1U rack mount on ebay for the completely
I'll add that for some reason the discussion never morphed over to an
alternate list created just to discuss a counter project without
taking up bandwidth here. Not sure that there was enough interest.
Other Bob
On Mon, May 16, 2011 at 11:53 AM, Bob Camp li...@rtty.us wrote:
Hi
The polls ran
solutions after it's started.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bob Bownes
Sent: Monday, May 16, 2011 11:56 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Results parts selection
I know it has come up in the past so I thought I would check here
before hunting one down in the outside world.
Anyone have a suitable distribution amplifier that they are looking to
part with? My consumer device count has exceeded my source capability.
:)
Please respond offline, save a few
Finally got around to doing a bunch of work tonight.
Got my lab Parallels machine all set up. Now have Lady Heather, DG8SAQ
VNWA code, and the VE2ZAZ MoniTrol all running effectively in OS X.
http://www.lensgarage.com/gallery3/index.php/Electronics-and-Ham-Radio/coolstuff
Finally...Next comes
Thanks to all for the discussion, but I'm still not sure why I have a
(now) consistent 1.495 hz frequency difference between the thunderbolt
and the VE2ZAZ FLL.
On a similar note, forgive my ignorance, but is there a simple
explanation why there are different frequency readings on my 5370B
when
First it was building a VE2ZAZ GPSDO with an 10881 I happened across.
Next came the TICII's followed closely by the 5370B. Then the
thunderbolt. Now it's time to break down and get 10Mhz/5Mhz
distributed to all the instruments in the lab. (Still looking for a
distribution amp)
Now the ZAZ GPSDO
that's a fact ;-)
Luis Cupido.
ct1dmk.
Bob Bownes wrote:
First it was building a VE2ZAZ GPSDO with an 10881 I happened across.
Next came the TICII's followed closely by the 5370B. Then the
thunderbolt. Now it's time to break down and get 10Mhz/5Mhz
distributed to all the instruments
Yes, of course.
On Tue, May 3, 2011 at 3:51 PM, Rex r...@sonic.net wrote:
On 5/3/2011 9:16 AM, Bob Bownes wrote:
First it was building a VE2ZAZ GPSDO with an 10881 I happened across.
...
I suspect the 10881. :(
I think you are stuttering on the wrong digit.
You must mean the venerable
Check here:
http://ve2zaz.net/GPS_Std/GPS_Std.htm
Bert is on this list.
Bob
On Tue, May 3, 2011 at 11:23 PM, Heathkid heath...@heathkid.com wrote:
Did I miss something? I've searched but can't find anything about this
one...
Could someone please point me to the info on this?
73 Brice
Thought I would consult the assembled wisdom here.
I'm looking for an HP frequency generator with sweep capability in the
1-20Mhz range. I can live with 1-11, and would really love 1-55, but
1-20 seems to be the most common. Other instruments I already own
cover 10 and up. The goal here is to
Here are my answers:
Done it before? - yes.
Done it in the basement / last 2 years? - Yes. In last 24 hours actually.
Set up to do it in the basement? - Yes. Can do by hand, hot air rework
tools, or reflow oven.
Would I buy one? - done that before. Likely would again. (counts as a yes).
Would
The last 'modern' seismometers I worked with (as an undergrad in the
early 80's) were all three axis laser interferometry based. I'm sure
they've gotten a bit better since then.
Not only could we pick up a shuttle launch from 1,400 miles away, we
could pick up frat parties from across town on
What is the conversion factor for Richter to dBm? :)
Bob
As a guy with degrees in geology and EE. I really should know this...:)
On Thu, Feb 24, 2011 at 8:11 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
On 24/02/11 10:38, Steve Rooke wrote:
I heard he was still shaking :)
Did he
Speaking of which, I have some instruments I'd like to usb enable. The
instruments have analog output. Ideally I'd like to use a USB
microcontroller and simply read back the analog value. Once I have the
analog value I can handle it from there. If someone has some
experience doing such, please
Ian,
I've dropped the temp and the noise level in my 'lab' by replacing
many of the old 110V fans whose bearings are getting on with more
modern 'silent' 12V fans that use less power, move more air, and are
far quieter than the 110 fans ever were. You can find them from a
number of sources
Not to mention improvements in motor design. The brushless motors have
gotten better and the change to lighter plastics has put much less
burden on the bearings, which while they might not last as long, sure
are a lot quieter. One of the parameters you can use now to select
fans is the noise
In my view, this technical tone-deafness at the FCC persists because there
has been no engineering expertise or background at the Commission(er) level
since ... well, I'm not sure there ever was, but perhaps in the 1930s-'40s.
The FCC staff is supposed to provide engineering support, but
Yes, it's still active. I've created a mailing list and google group
just for the counter project. opencoun...@googlegroups.com to keep the
counter project from going out to all 800 time-nuts.
The discussion seems to want to take place here however. :) I've been
trying _not_ to be the lead of the
I solved the same problem today by putting the antenna in the skylight
dome in my 'office'. Between the heat loss and the dome shape the snow
pretty much stays off of the skylight. This is after I just had the
antenna laying on the roof, where it got buried under 10+inches of
snow in the last week
depending on the complexity, I use one of 3 approaches:
1) Premade adapter (aka surfboard) which adapts the package to
something with pins on 0.1 spacing. These can be bought various
places or made with traditional methods at home.
2) Quick home made version of above. Usually double sided pcb
After the discussion a few weeks ago, I started looking for a 5370. In
answer to the question about affordable 5370's, yes, there are sub $200
5370's out there. I just acquired one from eBay. Listed as 'won't power up'.
Close look at the pictures showed intact Agilent calibration stickers on the
Really I just used I2C in my write-up as a place holder. I you say
nothing no one ever says a blank paper is wrong and suggests something
better.
Using a serial interface is nice, but I2C is not the one of my choosings.
I'd go for plain serial interface, RS-232 like, but not necesserilly
signals from those modules to the processor board and/or
the A/D boards.
Hmmm.
Bob
On Thu, Dec 23, 2010 at 2:40 AM, Javier Herrero jherr...@hvsistemas.eswrote:
El 23/12/2010 05:24, Bob Bownes escribió:
ARM or other general purpose CPU is interesting, but at what cost for
complexity
The other is what one can buy on the market that is
better than the HP 5328?
The first step up IMHO is the HP 5335. I have two.
AFAIK it is the first of the series that will do TIC. The TIC
specification is 100 pico-seconds.
For reference the HP 5370A/B TIC spec is 10 pico-seconds.
The
The 5328 will also take a 10881. Plugs right into the motherboard.
You go via a separate board to have a 10811 oscillator. It is not uncommon
for 10811s to be delivered with this board since some figure they get more
by selling the 5328 separate from the 10811. Ah well. I use that board
Perhaps I'm old school, but this sounds overly complex to me.
Probably the most important thing I learned in engineering school
(besides where the beer and amiable consorts were) was KISS. The more
complex, the less likely the project is to complete.
So I pose the question: Do we need a bus like
Comments inline. Hopefully I've edited this enough to prevent it being
overwhelming.
On Wed, Dec 22, 2010 at 7:40 PM, Hal Murray hmur...@megapathdsl.net wrote:
I think I'm missing the big picture. What sort of things are people
interested in building? Will they all be a reasonable fit with a
*
*Interesting. There are some Hittite D type flip flips that spec out at
13Ghz and 18-22ps rise/fall times with 'deterministic jitter' of 2ps, and a
T type that tops out @26Ghz. Not cheap I'm sure, but we shall see.
I've posted a preliminary specification on the Open Counter google group.
The
Well said Chris. Take a look at the initial spec in the OpenCounter Gogle
group and tell me what you think with respect to your item #1. I think the
core counter is going to be the really difficult part of the module list.
Item #2 is going to be a tough one methinks. I love Eurocard, but, as you
.
Best,
Don
Bob Bownes
Well said Chris. Take a look at the initial spec in the OpenCounter Gogle
group and tell me what you think with respect to your item #1. I think
the
core counter is going to be the really difficult part of the module list.
Item #2 is going to be a tough one
,+5vdc (even some with 3.3vdc) power
supplies.
Bob
On Mon, Dec 20, 2010 at 6:20 PM, Bob Bownes bow...@gmail.com wrote:
Well said Chris. Take a look at the initial spec in the OpenCounter Gogle
group and tell me what you think with respect to your item #1. I think
the
core counter
From the sounds of it, I'd guess there are enough folks here that
could put a QFP or two on boards for those less sure of their talents.
That makes doing a run of a dozen or two of anything non bga wouldn't
be an issue. As Xtof pointed out, a controller (or a good eye) and an
old toaster oven can
Very good points.
For the core counter, are you talking about an interval counter or a
more generic two input, tell the CPU what to do with the inputs kind
of model? :)
USB certainly would be the interface of choice, but serial also has
it's place. The joy is there is less software to write.
You can very often pick up a 5328 with the 10811 in it for $20 plus
shipping. Last one I bought was $15 including shipping...
Bob
On Tue, Nov 30, 2010 at 3:29 PM, J. L. Trantham, M. D. jlt...@att.net wrote:
My favorite has been the 5334B with Option 010.
Joe
-Original Message-
Like hammers, every tool has it's place and if you only have one
hammer, everything looks like a 10penny nail.
As a guy with an unfortunate affliction to test equipment, (as do many
of you, I'm sure) I've got a 7000 series analog scope which I love, a
tek 2236 portable, a DS602 digital, and a
To sort of make an on/off topic comment, here in NY, we have recently
begun using hypothermic protocol on cardiac arrest patients that have
undergone a reversal. If the heart has stopped and been restarted
either with a defib or by CPR alone and we are on scene in a short
enough span of time, we
Fascinating discussion.
One of my 'fest finds long ago was a 10811 on a 05328-20027 board.
When I recently went and googled on that, I came up with a 5+year old
discussion from the archives of this very list.
http://www.febo.com/pipermail/time-nuts/2005-May/018382.html says that
the 05328-20027
If you find a good source for the prototype kits, by all means, let me
know. I've been gutting cheap/dead modules for the enclosures. A
project I've been considering is putting a T'bolt into one just to
send 1pps and 10mhz down the backplane.
BTW, there is a yahoo group for TM500/5000 series
Nice to know I'm not the only one who has had this idea.
My thinking was to use a laptop supply plugged into a socket on the
back of the TM5006 and route volts down a pair on the back-plane to
modules that need continuous power. Drive the GPSDO and ovens on the
modules that have them.
And use a
At risk of giving up a secret source, I've just discovered that if you
buy an HP 5328a/b with option 010, it comes with either a 10811 or a
10544 inside.
Alone, these tend to command $80-$125 while working 5328a's with
option 010 can be had for as low as $10+$20 shipping. Patience will
turn up
Speaking of which, should have or stumble a gpib for said 5328a, I'm
looking for one to go in my counter.
Thanks,
Bob
On 7/24/10, Mark Spencer mspencer12...@yahoo.ca wrote:
Thanks, I'm glad to hear I am on the right track. At some point it would
be
nice to obtain a counter that can
Does anyone have any documentation on these GPS modules? I've been
unable to determine anything other than Magnavox sold the line to
Leica.
They have a 20 pin header much like a Jupiter, but don't appear to be
pin compatible.
Thanks,
Bob
___
time-nuts
Bob Bownes wrote:
Does anyone have any documentation on these GPS modules? I've been
unable to determine anything other than Magnavox sold the line to
Leica.
They have a 20 pin header much like a Jupiter, but don't appear to be
pin compatible.
Thanks,
Bob
/MX4102.shtml#4200
Have Fun,
Brooke Clarke
http://www.PRC68.com
Bob Bownes wrote:
Does anyone have any documentation on these GPS modules? I've been
unable to determine anything other than Magnavox sold the line to
Leica.
They have a 20 pin header much like a Jupiter, but don't appear
Unfortunately the cable reached its sell by date on the 18th May this year
when it broke, dropping the ball on the marble floor , denting it. Most
unfortunate.
Denting the bob or the marble floor? :)
___
time-nuts mailing list -- time-nuts@febo.com
There is at least one in DC, at the Smithsonian iirc.
RPI, where I went to college, had one in the 3 story stairwell in the
library. Don't know if it is still there.
I remember one someplace in London too.
Someone mentioned temperature compensation. What would you need to
compensate for? Temp
Silly me, I just realized you need to compensate for the change in
length with temperature.
This sounds like a great project!
On Wed, Jul 21, 2010 at 10:26 PM, Bob Bownes bow...@gmail.com wrote:
There is at least one in DC, at the Smithsonian iirc.
RPI, where I went to college, had one
Not to mention not having to drill holes anymore. I built a 15Ghz
prescaler over the weekend. Total time from concept to completed (and
operational!) prototype was 2 hours. No muss, no fuss, just design
the circuit, print out the toner transfer, paste it onto the board,
etch, apply paste parts,
A few short videos shot with the camera/usb video capture setup I
mentioned earlier:
http://www.fastbobs.com/bob/radio/video1.mpg Video 1 - Black White
inspection of a prototype power sensor. Low magnification
http://www.fastbobs.com/bob/radio/video2.mpg Video 2 - Colour
inspection of same
q4 and the 3/8 trimmers are in my list.
On Thu, Jul 8, 2010 at 8:34 PM, Bob Bownes bow...@gmail.com wrote:
I'll get these 2 corrections in tonight. I was wondering if the 3/8
parts would fit.
On Thu, Jul 8, 2010 at 8:07 PM, Bob Camp li...@rtty.us wrote:
Hi
Another thing I think we need
I'll get these 2 corrections in tonight. I was wondering if the 3/8
parts would fit.
On Thu, Jul 8, 2010 at 8:07 PM, Bob Camp li...@rtty.us wrote:
Hi
Another thing I think we need to get on the project is Q4:
512-2N7000TA Farichild's version at 0.13 each.
Since I didn't create the
It has not been updated yet. We're still looking for a good replacement.
On Wed, Jul 7, 2010 at 10:57 AM, Lester Veenstra les...@veenstras.com wrote:
Has the Mouser list:
https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=c7ada9ced0
Been updated with the right trimmers, or is
to
the intended recipient, be aware that any disclosure, copying, distribution
or use of the contents of this e-mail or any documents attached hereto is
prohibited.
-Original Message-
From: Bob Bownes [mailto:bow...@gmail.com]
Sent: Wednesday, July 07, 2010 4:05 PM
To: les
Ill take two boards by the way.
Thanks!
On 7/3/10, Stanley Reynolds stanley_reyno...@yahoo.com wrote:
No problem, I expect to have the boards 7/21, I will have plenty.
Stanley
- Original Message
From: Robert Berg bo...@pobox.com
To: Discussion of precise time and frequency
Ok. I think there are a few of us who can/would program these up for
folks who need one.
On Fri, Jul 2, 2010 at 11:43 AM, Stanley Reynolds
stanley_reyno...@yahoo.com wrote:
Thank you but I have all I want to do with the boards later I may change my
mind.
Stanley
- Original Message
Folks,
I put together a mouser 'project' with all of the parts. This means
you can just go to the mouser site and order all the parts for the
project. No need for anyone to do a group buy of parts, re-pack and
re-distribute them. Here's how to get to it:
To access the project, click on the url
in (12 weeks...).
The 3266X (side adjust rather than top adjust) is in stock. I'm not sure if
the layout is side adjust friendly or not.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bob Bownes
Sent: Friday, July 02, 2010 2:54
I'd like one.
On Thu, Jul 1, 2010 at 11:41 AM, Stanley Reynolds
stanley_reyno...@yahoo.com wrote:
The price would be at my cost and actual shipping, no packaging or processing
charges added by me. Not sure of price till I have the number of boards but
hope
as a group we will get a better
There are a couple of very nice VNA's that can be picked up in
assembled or kit form for $500. The DG8SAQ and N2PK units both come
to mind.
On Thu, Jun 3, 2010 at 12:58 AM, jimlux jim...@earthlink.net wrote:
J. Forster wrote:
VNAs are very expensive toys. I have an HP 8753 and was just outbid
So, do folks have a preferred GPS module to discipline clocks? Clearly
some are better than others. I'd like one that will output in NMEA so
I can use it to drive some other things as well, but other than that,
it has become clear that the Rockwell MicroTrack TU00 just isn't going
to cut it as it
On a similar note, should anyone have a working 853a display they are
willing to part with, please contact me.
Thanks,
Bob
On Mon, May 17, 2010 at 10:50 AM, K. Szeker szeke...@gmail.com wrote:
PS:
I know Mr. Lüders as a very serious seller, really 100% OK!
K.
2010/5/17 K. Szeker
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