On 8/6/12 10:43 AM, Chris Albertson wrote:
On Mon, Aug 6, 2012 at 8:34 AM, Jim Lux jim...@earthlink.net wrote:
what would be useful is to have some sort of plotting engine that is a
canned webpage (or stored locally on the user/client computer) that can
ingest fairly raw data from a URL
On 8/5/12 10:35 PM, Hal Murray wrote:
david-tay...@blueyonder.co.uk said:
I load screen shots into Corel Photo Paint 8 and resample the image to a
good size for a web page somewhere between 600 and 800 pixels horizontally.
Where did 600 or 800 come from?
800 is historical, as is 640
what would be useful is to have some sort of plotting engine that is a
canned webpage (or stored locally on the user/client computer) that can
ingest fairly raw data from a URL..
something, conceptually, like this:
BODY
*invocation of plotting engine*
data value 1
data value 2
data value 3
On 8/6/12 9:16 AM, Hal Murray wrote:
jim...@earthlink.net said:
what would be useful is to have some sort of plotting engine that is a
canned webpage (or stored locally on the user/client computer) that can
ingest fairly raw data from a URL..
...
A low end microcontroller has no problem
On 8/5/12 5:24 PM, Hal Murray wrote:
li...@rtty.us said:
The next most likely would be a trucker trying to jam the location stuff on
his truck. I'm betting that they will be buying multi mode jammers soon…
What is the frequency used by Glonass or Galileo? (I think they are close to
and/or
On 8/2/12 6:24 PM, Doug Reed wrote:
I ran into a wiki description of GPS using WGS84 a couple days ago. It
included a mention of ESEC and it was something like: Earth Static,
Earth Centric. I think I was following a link about the Z3801A.
It referred to the fact that lat-lon is referenced to a
On 7/28/12 1:32 AM, Said Jackson wrote:
We have about 25 different GPSDOs running from four cheap antennae on the roof
in Los Gatos right next to Hwy 17, and have not noted any unusual outages at
all, even during the recent solar flare.
I guess any truckers with jammers on hwy 17 pass by so
On 7/27/12 6:42 PM, Brian, WA1ZMS wrote:
Does anyone know if there is ANY recent active Lightsquared testing taking
place in the SFO area of the US?
Very unlikely.. they've lost their experimental license.
I'm dealing with a day-job issue with GPS clocks in the Bay Area showing
GPS
On 7/24/12 8:48 PM, ed breya wrote:
I recently picked up an interesting early 1970s vintage WWVB receiver,
Model 630, made by Specific Products of Monrovia, CA - that's what the
adhesive sticker on the front says, and the name 1 MHz Time Base
Calibrator (Utilizes WWVB accuracy of 2 parts in
On 7/23/12 3:23 PM, Tom Van Baak wrote:
Hi Pete,
Yes, there are several ways to represent frequencies:
1) Absolute units of Hz. For example 60 Hz, or 32.768 kHz, or
3.579545 MHz, or 9.192631770 GHz. Note some modern texts use s⁻¹ (1/s
or s-1) instead of Hz or Hertz. Or, you can always show
On 7/19/12 4:09 PM, Magnus Danielson wrote:
On 07/20/2012 12:33 AM, li...@lazygranch.com wrote:
Are you speaking of slew rate limiting in the strict sense of the
word, that is a current starved input stage due to the presence of a
compensation cap? Or are you using the term slew more vaguely.
On 7/15/12 12:38 PM, Mark Spencer wrote:
Some form of backup to gps would be nice for timing purposes. I wonder if a
secondary sattelite based system for timing use only over the continental US
might be the way to go. (Ie. a transmitter on a geo stationary sattelite that
could emulate
On 7/15/12 1:32 PM, Mark Spencer wrote:
In my view a backup solution that allows the existing gps based timing
receivers to be used makes a reasonable ammount of sense. Another approach
could involve ground based transmitters on high buildings or mountain tops.
Retuned Lightsquared
On 7/15/12 6:25 PM, Chris Albertson wrote:
On Sun, Jul 15, 2012 at 5:24 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
The benefit of WAAS and EGNOS is that they have a fixed location in the sky.
so you could use a highly directional antenna, like a parabolic antenna,
which would
On 7/14/12 9:19 AM, Joseph Gray wrote:
Perhaps some of the cellular bands aren't affected, perhaps some are.
I don't know the specific cause of yesterday's loss.. GPS uses around
1200/1500 MHz. The phone in question uses 850/1900 Mhz bands, so I
think we're in the neighborhood.
GPS signals
On 7/11/12 7:00 PM, Mike S wrote:
On 7/11/2012 8:15 PM, Chris Wilson wrote:
Does anyone know if there's a means to log max and min temps for these
things? I was going to make a crude box for mine out of 2 inch cavity
wall
insulation hard foam,
The TB reports it's own temperature. Lady Heather
On 7/7/12 9:21 AM, Dr. David Kirkby wrote:
I can confirm that I'm 100% sure that the polarization of the two
antennas needs to be the same - i.e. both RHCP or both LHCP. I built two
of them for RHCP, and got appreciate gain.
Despite what other may say, there does seem to be a lot of confusion
Exactly. Reflections reverse the cp sense
On Jul 7, 2012, at 11:40, Tom Knox act...@hotmail.com wrote:
Thanks for clearing up any confusion Magnus, one more question, are the any
conditions such as reflected signals that can reverse polarization?
Thomas Knox
On 7/5/12 10:45 PM, Robert Atkinson wrote:
Hi Ed,
It's not just just cheap and nasy regens that cause this problem. Some
aircraft navigation and communication receivers where found to have enough local
oscillator harmonic leakage at 1575 MHz through the antenna port to jam GPS then tuned
to
On 7/6/12 7:51 AM, Azelio Boriani wrote:
Yes, I'm also interested in how-to. At the moment I think it is a hack:
there is no sound card AFAIK that accepts a reference input. I have
recently bought an Acqiris/Agilent DP105/U1067A 150MHz 500Ms/s digitizer
PCI card that accepts an external 10MHz as
On 7/6/12 7:51 AM, Azelio Boriani wrote:
Yes, I'm also interested in how-to. At the moment I think it is a hack:
there is no sound card AFAIK that accepts a reference input. I have
recently bought an Acqiris/Agilent DP105/U1067A 150MHz 500Ms/s digitizer
PCI card that accepts an external 10MHz as
On 7/5/12 6:33 PM, gary wrote:
I believe all electronics needs FCC approval for emissions. [Not my job,
but I know engineers that complain about compliance testing.]
433MHz is a freeband (ISM). Still, you are supposed to be clean.
433 is NOT an ISM band in the US (or in region 2, for that
On 7/3/12 7:34 AM, cfo wrote:
I just got a PM6680/016 - Std. Osc + GPIB + 1.3Ghz -Chan.C
The best my budget could afford :-)
I would like to try out John's Timelab.
But only have a Prologix-Ethernet GPIB adapter , no USB version.
I was wondering if anyone can confirm that Timelab would work on
On 7/1/12 2:43 PM, b...@lysator.liu.se wrote:
Tom,
Chris,
The HP 5065A is one of the best Rb ever made.
/tvb (iPhone4)
Have you or any other list member had the opportunity to take measurements
on the ElmerPerkin/EGG Space rubidiums (in a lab environment)?
On 7/1/12 10:54 PM, Poul-Henning Kamp wrote:
In message 4ff0f373.1020...@pacific.net, Brooke Clarke writes:
Would you rather have these minor problems or have a much bigger
one when they make a larger correction?
But isn't that exactly why it is a problem ?
News coverage of leapseconds are
On 7/2/12 6:19 AM, Poul-Henning Kamp wrote:
In message 4ff19d3c.4050...@earthlink.net, Jim Lux writes:
which is an interesting thing.. if instead of DST (for which I think
there's little practical reason to have in the first place).. say you
just shifted the clock one minute earlier or later
On 7/2/12 7:08 AM, Mike S wrote:
On 7/2/2012 9:28 AM, Jim Lux wrote:
but if we ARE going to establish artificial connections between wall
clock time (work hours, store opening times, bar closing times, etc.)
and the sun, why not do it gradually.
Time and the sun are certainly a _natural_
On 6/28/12 5:22 AM, J. Forster wrote:
FYI, MIT got anal about IP policy in the early 1970s, demanding a transfer
of all IP rights to the Institute for everything everyone did.
I quit and went into the Consulting business (and wound up getting paid a
LOT more for the same work).
There is a
On 6/28/12 6:38 AM, Peter Gottlieb wrote:
Very true, and in some cases (Texas case) a judge ruled that an employee that
left a firm can never work in that same field again for the rest of their life
due to both positive and negative knowledge.
Not in California, where such agreements are
On 6/28/12 3:07 PM, Bill Dailey wrote:
Guys,
I am looking for info on injection locking. I have been searching around for
info. I found an article that probably answers my question but I can't get to
it.
On 6/28/12 3:22 PM, Magnus Danielson wrote:
Bill,
On 06/29/2012 12:07 AM, Bill Dailey wrote:
Guys,
I am looking for info on injection locking. I have been searching
around for info. I found an article that probably answers my question
but I can't get to it.
On 6/28/12 6:48 PM, David McGaw wrote:
You know, if one could get accurate delays from a number of locations,
one could triangulate its location - just thinking. :-)
This is timenuts...
we should collect statistics on the signal and figure out what kind of
oscillator they're using...
On 6/25/12 7:11 PM, Chris Albertson wrote:
On Mon, Jun 25, 2012 at 6:43 PM,li...@lazygranch.com wrote:
Yeah, I read it. Typical Fox. The headline isn't accurate since they
spoofed the civilian GPS system, not the military GPS.
I think it is. Currently the military uses GPS guided drones
On 6/26/12 3:38 PM, J. Forster wrote:
Whether it's spoofing or jamming, domestic drones are becoming ubiquitous,
because they are just so tempting, and sooner or later one is gonna crash
onto a populated area, either by accident or deliberate mischief.
A piloted aircraft may be able to avoid
On 6/26/12 11:05 AM, Bill Hawkins wrote:
Around 1530, it was considered very bad luck to walk around a church
widdershins (see the Wikipedia article). I think it goes back earlier
than that, to a time well before clocks.
If widdershins means counter-clockwise, how did they know which way
clocks
On 6/26/12 4:42 PM, J. Forster wrote:
IMO, your failure rate estimate does not include the probability that some
people might not like being spied on by UAVs.
I can easily see a market for ground based GPS jammers, especially, in the
more rugged, fertile, and inaccessible areas of California.
On 6/26/12 5:51 PM, Chris Albertson wrote:
On Tue, Jun 26, 2012 at 3:59 PM, Jim Luxjim...@earthlink.net wrote:
I did some calculations last year, and if Los Angeles decided to put up a
UAV 24/7 to replace things like helicopters, we could expect a crash into
the city about once a week.
On 6/15/12 9:49 PM, Mark Sims wrote:
Lady Heather can do sidereal time. Specify either the LMST, LAST, GMST or
GAST time zone (for Local/Greenwich Mean/Apparent Sidereal Time).
___
time-nuts mailing list --
On 6/13/12 1:38 PM, Bob Camp wrote:
Hi
Do they grant the right, or do people just get away with it?
it is formally granted.. the IEEE instructions for authors or something
like that talks about it.
You can put your own papers up on your own website, and you make sure
you have
On 6/11/12 10:31 PM, Hal Murray wrote:
albertson.ch...@gmail.com said:
But you know what? If you simply place an automotive puck type GPS
antenna on your roof you have to do the same thing. It must be grounded the
same way, same lightening protection and so on. So in the end you may as
On 6/9/12 6:50 PM, David Kirkby wrote:
On 10 June 2012 01:39, Jim Luxjim...@earthlink.net wrote:
NEC can do a pretty good job on a helix, and it's free. I like 4nec2 as a
front end.
I've never tried NEC on them. I quite like MMANA-GAL myself. But it
only supports NEC2.
4nec2 does both
On 6/10/12 4:24 PM, Chris Albertson wrote:
On Sun, Jun 10, 2012 at 2:50 PM,b...@lysator.liu.se wrote:
... 3m
of antenna cable is no problem. Antenna position is more important than
the exact type of antenna. I'd rather have a decent antenna at a very good
site, than a very good antenna at a
Totally agree
On Jun 10, 2012, at 19:34, Chris Albertson albertson.ch...@gmail.com wrote:
On Sun, Jun 10, 2012 at 4:43 PM, Jim Lux jim...@earthlink.net wrote:
HOWEVER, your scheme is going to be tricky to pass muster with the
National Electrical Code. Two aspects need attention:
You
On 6/8/12 5:20 AM, Michael Baker wrote:
Time-nutters--
The Procom website lists the noise-figure of their quadrifilar
LNA as:
GAIN 30 dB
NOISE FIGURE 3 dB (incl. input filter).
Typ. approx. 3 dB
I am a little surprised at this
On 6/8/12 9:21 AM, steve heidmann wrote:
Is it worth driving from Thousand Oaks to Altadena for Snowcones (qty 5)
tomorrow ?
--- On Fri, 6/8/12, Jim Luxjim...@earthlink.net wrote:
http://www.jpl.nasa.gov/events/open-house.cfm
Well.. they've got all the stuff setup for JPL open house..
On 6/5/12 5:20 PM, Tom Van Baak wrote:
Attached are two snapshots of a NASA live feed -- an interesting reminder about
the difficulty measuring timing signals with great precision.
When you look closely, the leading edge of the sun is rather ill-defined, not
unlike many 1PPS pulses. I suppose
On 6/6/12 7:02 AM, Mike S wrote:
On 6/6/2012 9:09 AM, Jim Lux wrote:
does anyone have a reference to the math and process used to measure
distance from earth to sun using transit of venus?
http://transitofvenus.nl/wp/getting-involved/measure-the-suns-distance/
Of course, back
On 6/4/12 10:24 PM, Hal Murray wrote:
Does window glass have significant attenuation at GPS L1?
What if it's a big window on a modern green office building and has some sort
of coating/content to reduce IR transmission?
Google found an (expensive) paper from IEEE where the abstract said:
On 6/4/12 10:44 PM, Chris Albertson wrote:
On Mon, Jun 4, 2012 at 10:18 PM, Hal Murrayhmur...@megapathdsl.net wrote:
What is the significance of the pointy tops of the long skinny antennas?
Guessing. Terminates the end of the conductor to prevent a discontinuity
and reflection
more
On 6/5/12 9:14 AM, Chris Albertson wrote:
On Mon, Jun 4, 2012 at 11:26 PM,li...@lazygranch.com wrote:
The low-E coatings are known to attenuate WIFI. WIFI is probably a worse
case than GPS, but the availability of the gear makes experimenting easy. I
think they are sputtered metal either on
On 6/5/12 5:20 PM, Tom Van Baak wrote:
Attached are two snapshots of a NASA live feed -- an interesting reminder about
the difficulty measuring timing signals with great precision.
When you look closely, the leading edge of the sun is rather ill-defined, not
unlike many 1PPS pulses. I suppose
On 6/2/12 2:57 PM, Chris Wilson wrote:
I am looking to get a frequency standard for my amateur radio shack,
initially for verifying test gear readings, but later as a standard
to lock receiver and transmitter oscillators to. I was going to buy
a GPS frequency standard but a friend
On 5/30/12 6:11 AM, Attila Kinali wrote:
Hi,
I recently bought some Oscilloquartz 8663 from ebay and am now wondering
how to check whether they are working correctly or whether they are
out of specs.
Unfortunately, although i have a reasonable park of measurement instruments,
none of them are
On 5/15/12 9:05 AM, Brooke Clarke wrote:
Hi:
You might consider using a piece Tyvek material. You can get it free
from the USPS in the form of a priority mailing envelope or at a
construction site where it's used to warp the outside of houses.
Passes water vapor and air but not water.
I
On 5/11/12 4:34 AM, shali...@gmail.com wrote:
Yes, I moved them yesterday
Didier KO4BB
--Original Message--
From: Mark Sims
Sender: time-nuts-boun...@febo.com
To: Time-Nuts
ReplyTo: Time-Nuts
Subject: [time-nuts] Trimble Resolution SMT - good/bad/indifferent?
Sent: May 10, 2012 11:02
On 5/11/12 12:48 AM, MailLists wrote:
Who would listen to pure sine tones?
As a youth, I listened to WWV, which is a pure sine tone, in between the
ticks. Drove my parents batty.
___
time-nuts mailing list -- time-nuts@febo.com
To
On 5/11/12 2:38 AM, Hal Murray wrote:
Why in the hell would anybody build a 50 channel receiver? At most you
MIGHT see 12 usable GPS sats... I don't think that I've seen over 10. WAAS
should be fairly useless for a timing receiver.
I can think of a couple of reasons. I'm sure there are
On 5/11/12 5:23 AM, swingbyte wrote:
s disappointing!
I need to measure the height of my house floor to be above the flood
plane contour. I might have a look at some dted from work. Might have to
pay a real surveyor to measure the height datum.
Thanks for all the info though guys
for that,
On 5/11/12 5:54 AM, Chuck Harris wrote:
Go to your local building and planning commission, and get yourself
a copy of the topographical map for your address. They are cheap, and
are the standard by which everyone (insurance, zoning, ...) determines
your flood plane exposure.
I have been
On 5/11/12 1:51 AM, Attila Kinali wrote:
Moin,
I just stumbled over a nice little summary how to calculate the jitter
of a signal from its phase noise plot by silicon labs:
http://www.silabs.com/Support%20Documents/TechnicalDocs/AN256.pdf
Attila Kinali
and one from
On 5/10/12 6:08 AM, Magnus Danielson wrote:
On 05/10/2012 02:50 PM, swingbyte wrote:
Hi all,
Hope this isn't too chat roomy, however, I have need of a survey precise
geolocation type gps. I was wondering if the precise timing abilities
extend to its precision in position output? I have a
On 5/10/12 6:42 AM, mike cook wrote:
A man with only one GPS
Surveys from different receivers I have. All taken at the same height
from prolonged surveys. WGS84 datum.
Oncore UT+ A 207,62m
Oncore UT+ B 209,24m
Z3801A 180,72m
Oncore VP A 229,95m
TBolt 207.00m
That's a pretty big
On 5/10/12 7:40 AM, Arthur Dent wrote:
I've found significant altitude errors using a GPS and the following quotes
found on the internet will explain why. From my experience of hiking
in the mountains of New Hampshire an aneroid altimeter will vary with
atmospheric pressure about 200 feet for a
On 5/10/12 9:18 AM, Chris Albertson wrote:
On Thu, May 10, 2012 at 9:07 AM, Bob Campli...@rtty.us wrote:
.
Hi all,
Hope this isn't too chat roomy, however, I have need of a survey precise
geolocation type gps. I was wondering if the precise timing abilities
extend to its precision in position
On 5/10/12 10:46 AM, Chris Albertson wrote:
mean sea level is not meaningful any more. What shape is the ocean
and what if you live in Kanas? How to extrapolate the ocean level to
Kanas? The answer is to use a model of some kind
mean sea level, these days, is a name for a particular
On 5/10/12 11:36 AM, Hal Murray wrote:
albertson.ch...@gmail.com said:
I've alway have thought that if nanosecond level jitter is bad then
breathing while listening must be really bad. If you inhale the path length
from your ear to the speaker changes at the microsecond level.
You'd think
On 5/10/12 12:44 PM, Chris Albertson wrote:
On Thu, May 10, 2012 at 10:25 AM, Heinzmann, Stefan (ALC NetworX
GmbH)stefan.heinzm...@alcnetworx.de wrote:
Benjamin and Gannon, the first reference in Ashihara's paper, come to lower
figures for sinusoidal jitter with carefully selected
On 5/9/12 4:27 PM, Charles P. Steinmetz wrote:
Don wrote:
It's interesting to note (to ask?): When did someone get smart enough to
start measuring 1/86 thousandth of a day
That is generally considered to be the 10th/11th century Persian Muslim
mathematician and astronomer, Abu al-Rayhan
On 5/9/12 11:06 AM, Attila Kinali wrote:
On Mon, 07 May 2012 15:16:51 -0700
jim sj...@jwsss.com wrote:
Sadly the actual information is behind a paywall.
BTW: Little known fact: most university libraries have site subscriptions
for the most popular/relevant scientific journals. You usually
On 5/9/12 10:04 PM, Attila Kinali wrote:
On Wed, 09 May 2012 18:11:22 -0700
Jim Luxjim...@earthlink.net wrote:
I'm not so sure about that, in general. (the access to the public, not
the tax funding).. A lot of universities have put badge readers on a
lot of areas that one might think are
So, I've looked at several dozen helibowls and talked to makers of said
items..
There is no published design, per se.
The instructions, as I was told, are go and buy a cheap mixing bowl
The ones I saw used things like plastic cups as a form, on which a wire
or piece of copper tape was
On 5/7/12 7:39 AM, Burt I. Weiner wrote:
A friend of mine signed me up for a catalog from the Audio Advisor. He
said I deserved this - I was afraid to ask what he meant by that! Spend
a few minutes looking over this site: http://www.audioadvisor.com/ Be
sure to check out their Power cords at:
One area where accuracy is important is not because of pitch (nobody can
hear 1ppm differences), but because of the need to synchronize sound
from different sources, particularly with video or motion picture frames.
1000 seconds (20 minutes, give or take) with the sampler off by 1ppm
will be
On 5/7/12 6:13 PM, J. Forster wrote:
A movie may be 7000 seconds, and you may need a fairly stable timebase,
but every movie I've watched is made up of short (300 second) scenes that
are placed sequentially on the framework.
You are not meshing together a pair or multiplicity of 7000 second
On 5/7/12 8:45 PM, Hal Murray wrote:
One thing that might help is if everybody would get in the habit of scanning
all their mail before responding to anything. The idea is that if a
discussion explodes while you are sleeping (or away from your mail for
whatever reason), you will learn that a
On 4/27/12 5:39 PM, Hal Murray wrote:
Back to somewhat time-nutty stuff...
Does anybody understand how they are using GPS and/or have performance numbers?
They don't need the actual position (DC), just the changes in position. They
need it now. They can't wait for post processing. I'm not
On 4/28/12 12:10 PM, shali...@gmail.com wrote:
I have not studied CPLDs but Actel has the only true Flash based FPGAs. The
flash cells directly control the FPGA fabric. As such, they are mostly immune
to Single Event Upset that plagues just about any other FPGA technology, and
there is no
On 4/28/12 3:32 PM, Tom Van Baak wrote:
Related to that, are there any seismometer experts on the list? I've
always wondered why they don't augment the extremely sensitive
detectors with less sensitive detectors? Of course a really good
detector will overload; so just co-locate cheap detectors
On 4/26/12 10:46 PM, cfo wrote:
On Thu, 26 Apr 2012 14:58:26 -0700, Jim Lux wrote:
On 4/26/12 1:24 PM, Hal Murray wrote:
albertson.ch...@gmail.com said:
2) The IDE is written in Java and is portable. It is truly identical
on all platforms. Yes it uses gcc but the end user never has
On 4/26/12 11:56 AM, Magnus Danielson wrote:
Hi,
On 26/04/12 10:53, Rob Kimberley wrote:
Nice article. Good to see a fellow 'Nut enjoying his hobby.
Oh yes, I do enjoy it.
...now to brush up on my Swedish
And, since NASA pays my salary, at least indirectly, nice to see you
On 4/26/12 1:24 PM, Hal Murray wrote:
albertson.ch...@gmail.com said:
2) The IDE is written in Java and is portable. It is truly identical on all
platforms. Yes it uses gcc but the end user never has to deal with gcc or
even know what gcc is. Same with saving your code, hit just puts it
On 4/18/12 6:56 AM, Attila Kinali wrote:
On Wed, 18 Apr 2012 09:28:17 -0400
Dan Kemppainend...@irtelemetrics.com wrote:
Wouldn't get broken if you hand carried it. I've carried on similar
equipment when flying across the US. I'm guessing you may not have to
check it for an internationl
On 4/17/12 6:56 AM, shali...@gmail.com wrote:
I agree that memory depth is an under appreciated parameter, but even 2,500
points like what's available on the cheap Tek scopes is quite useful.
On the other hand, I had a few LeCroy with 50k deep memories and there are
cases where that is very
On 4/17/12 7:15 AM, Robert Darlington wrote:
I need lots of memory on scopes. A buddy of mine I worked with in the
ultrasound world actually yelled at the Tek product management and
asked if they actually *use* oscilloscopes. The answer was a sheepish
no, and yet they felt qualified to develop
On 4/17/12 7:55 AM, John Lofgren wrote:
One feature of the Agilent and Rohde scopes (maybe Tek, too?) that can help in
some situations is segmented memory. It allows you to capture periodic or
random events with the full sample rate but to ignore all the dead time between
events. For each
On 4/16/12 8:19 AM, Eric Garner wrote:
I have the latest and greatest from both Tek and Agilent at work,
designed and made right here in the states. They suffer from menu-itis
just like the chinese stuff does. My Tek DSA 72004 at work is a
complete PITA to use unless I have the mouse and
On 4/15/12 3:46 AM, Attila Kinali wrote:
On Sat, 14 Apr 2012 20:11:14 -0500
h...@hiwaay.net wrote:
CA3130EZ is the lead-free version of the part. Looks like good stock
(both Newark and Avnet have thousands on the shelf), and should be
usable unless you're sending it into space or something.
On 4/15/12 6:20 AM, gary wrote:
The dummy pipe would be fine.
In theory ABS makes a good radome, but in practice whatever you get at
the hardware store effects antennas significantly. [ABS and PVC is the
first thing that comes to mind when weather proofing home made
antennas.] The AWACS uses
On 4/15/12 3:09 PM, li...@lazygranch.com wrote:
It is all over in the bay area. When manufacturing got outsourced, so did the
surplus.
A lot of my lab is made up of Foothill and Livermore flea market purchases.
(The local Metro PCS tech had the surplus Symetricomm and similar gear.)
Foothiil
On 4/15/12 2:09 PM, DaveH wrote:
I am on the Tesla email list and people there have noted that some of the
black plumbing pipe actually has carbon black added to it -- this renders
the pipe conductive and not good for a Tesla secondary form.
Would not be good for RF either.
It varies.. I've
On 4/12/12 2:09 AM, Rob Kimberley wrote:
There are commercial re-radiators for GPS. I found these on Google:
http://www.gps-repeating.com/?gclid=COTV88D6rq8CFcwTfAodhSKvmQ
http://gpsnetworking.com/GPS-re-radiating-kits.asp
One of my old suppliers in the UK was marketing a range of these, but
On 4/12/12 6:22 AM, Michael Baker wrote:
Time-nutters--
Around here (N. Central Flori-DUH) it is not uncommon for
near-by lightning strikes to damage underground cables and
wiring. This is why buried wiring to things like driveway
gate-openers are often placed in conduit rather than done
with
On 4/12/12 12:50 PM, li...@lazygranch.com wrote:
I'd suggest getting Dr. Uman's All About Lightning as a starter. You could
read it in an afternoon, so to be correct, the book is all about lightning, but it
doesn't contain all the world's knowledge. ;-). It isn't very technical, though he has
On 4/12/12 12:02 PM, David McGaw wrote:
Best would be to have a lightning rod in the vicinity of and above the
antenna. A sharp-pointed rod does not attract lightning, it REPELS it
and has a cone of protection under it. While the effect is not
understood, it apparently discharges the surrounding
On 4/7/12 2:47 AM, Attila Kinali wrote:
Moin,
On Sun, 01 Apr 2012 16:54:09 -0700
Jim Luxjim...@earthlink.net wrote:
Not a whole lot, but the whole paper goes into the various factors
involved. Ultimately, it winds up that the mismatch from SMAs is
a) a whole lot less than the usual worst
On 4/7/12 3:17 AM, Attila Kinali wrote:
On Mon, 02 Apr 2012 07:18:18 -0700
Jim Luxjim...@earthlink.net wrote:
John Strong's book on making stuff (procedures in experimental
physics) probably has a lot of the details (like how they put the
reflective coating on the mirror). That book is a
On 4/7/12 4:47 AM, Javier Herrero wrote:
El 07/04/2012 13:19, Azelio Boriani escribió:
The Xilinx and Altera have their embedded CPUs (Microblaze and Nios) IP.
I'm not familiar with them and don't know how much they cost. Until now I
have developed on Xilinx 50Kgates FPGA and 128 cells CPLD
On 4/7/12 10:08 AM, Javier Herrero wrote:
El 07/04/2012 16:02, Jim Lux escribió:
RTEMS wise... It's pretty well supported by the community, it's open
source, it does all the stuff you want a RTOS to do. it's NOT a
multitasking, dynamic loading OS like Linux. That is it doesn't
support an MMU
On 4/7/12 8:57 AM, Chris Albertson wrote:
If you are looking for free soft core CPUs for use in an FPGA then look here:
http://opencores.org/projects
Look under processors for many CPU cores. They also have some
Eithernet controllers you'd need.
Like all things opencores/sourceforge/etc you
On 4/4/12 6:56 AM, Robert Berg wrote:
You can get inexpensive conductive foam from Amazon.
Not all conductive foam works as a decent RF absorber. If the
conductivity isn't well matched to 377 ohms, then the RF reflects right
off of it. The black foam that ICs used to come in is a good
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