k that
>bullet
>antenna is the right thing to use. Somehow, I would think they should
>know.
>It is possible that they are prone to failure, I guess...
>
>It is surprising to me that the only antenna I can get to work is a
>Motorola
>puck that is supposed to be too low gain (and
Looks like my bullet might be bad.. .
Didier
"Charles P. Steinmetz" wrote:
>Chuck wrote:
>
>>I don't quite know what to say about that. Trimble seems to think
>that bullet
>>antenna is the right thing to use. Somehow, I would think they should
>know.
>
>I normally use a choke-ring survey ant
llet antenna?
>
>Steve K8JQ
>
>On 7/30/2012 2:46 PM, Didier Juges wrote:
>> Chuck,
>>
>> I have one of the original red box TB. It came with the Trimble
>Bullet antenna that is specified in the TB datasheet.
>>
>> The antenna works but gives ex
I have bought similar items on ebay as bin for $5 with shipping.
Didier
paul swed wrote:
>impressive
>Shame there is not a buy now. 1cent plus $4 shipping and you have to
>wait 2
>days to see if you won the bid. Or am I missing something?
>Regards
>Paul
>
>On Mon, Aug 13, 2012 at 7:11 PM, Chr
Another option is a "low end" laptop.
I use a Dell D400 laptop, with a 1.8GHz Pentium M and it draws about 20W from
A/C with the display blanked, which is the way an NTP server will be most of
the time.
The power brick rating assumes running the laptop AND charging the battery at
the same time
KO4BB is busy cutting plywood and boarding windows, will be back to fun stuff
after Isaac...
Didier KO4BB
Robert Watzlavick wrote:
>I finally got a flash programmer so I uploaded all three ROM images
>(TCXO, OCXO, Rub) for the Datum ET-6000 / 9390-6000 to the KO4BB
>website. Last year I sen
you can probably cite from the time-nuts archive
jim s wrote:
>
>On 9/11/2012 10:01 AM, Richard (Rick) Karlquist wrote:
>> The SC cut crystal is generally credited to Jack Kusters
>> (of HP) and Errol Ernisse. The story was something like
>> Errol proposed the concept and Jack actually made the
Doug,
If the manual is unencumbered, I would appreciate it if you could upload it
to my site http://www.ko4bb.com/manuals/
Thanks in advance,
Diier KO4BB
On Sat, Sep 22, 2012 at 6:45 PM, k4...@aol.com wrote:
> Chuck,
> Did someone send you a manual? I have a 6062A, probably very similar and
>
KO4BB.com ran out of disk space.
Apparently the Control Panel indicated I was using 120GB out of 160
available, but it was off by about 40GB...
About 90GB of that are manuals.
A good bit of the extra are duplicate files that resulted from the site
hosting transfer a couple of years ago that I
Have you looked at the blitzortung.org system?
There may be some ideas to glean from that
On July 28, 2016 6:12:54 PM CDT, Jerome Blaha
wrote:
>Hi Guys,
>
>This is a little outside of time-nuts scope, but not by much. I'm
>interested in finding the time between two rising edges above a set
>th
Thank you to those who let me know of an issue with my Manuals site last
week and this week.
It turns out that the primary issue was not lack of disk space (even though
that was going to be an issue very soon, so that has been fixed
preemptively) but an issue with the download app.
In the process
I concur. I have been using ExpressPCB extensively over the last 2 years
with great satisfaction now that it is possible to get Gerber files from
them.
I typically use the mini board pro service (3 bare boards, 2 sided with
solder mask and silk screen) for prototypes and then buy the Gerbers to
hav
I used the PPS from a Thunderbolt (fast rise lime, low rep frequency, was
handy) and a digital storage scope and a couple of resistors to make a
reflectometer based on this experiment:
www.ko4bb.com/getsimple/index.php?I'd=coax-cable-impedance-matching
You can very clearly see a 50 ohm/75 ohm m
m guessing a mobile spell checker changed his " id= " to " I'd= "
>(even though it was part of a URL).
>
>/tvb
>
>- Original Message -
>From: "Didier Juges"
>To: "Bob Albert" ; "Discussion of precise time and
>frequen
other?
>Bob
> -
>AE6RV.com
>
>GFS GPSDO list:
>groups.yahoo.com/neo/groups/GFS-GPSDOs/info
>
> From: Didier Juges
>To: Bob Albert ; Discussion of precise time and
>frequency measurement
> Sent: Thursday, Augu
n-standard and you can't use it for anything other then for their
>service. Most people needing free PCB software use Eagle, some use
>Kicad or some others. But Eagle seems to be kind of a universal
>standard.
>
>
>
>
>On Thu, Aug 11, 2016 at 8:55 AM, Didier Juges
>wrote:
on. However he charges for the program but it
>
>seems the prices are reasonable (
>http://www.robotroom.com/CopperConnection/Buy.html ).
>
>73BillWB6BNQ
>
>
>Didier Juges wrote:
>
>>The way ExpressPCB works is that their free software produces boards
>i
it more involved than the ExpressPCB program and does have
>GERBER files as a selection. However he charges for the program but it
>
>seems the prices are reasonable (
>http://www.robotroom.com/CopperConnection/Buy.html ).
>
>73BillWB6BNQ
>
>
>Didier Juges
I did not know Futurlec accepted ExpressPCB files, so I checked.
The equivalent to ExpressPCB mini board pro service (2 sided, solder mask
and silk screen, 3 pieces, same size) is $86 + shipping and one week to
shipment. ExpressPCB is $75 in 3-4 days in your mailbox including FedEx
(they do offer
If you have to regulate over ambient temperature as high as 120C, you need
an oven that regulates at a higher temperature, maybe 125 at least or 130C.
You will have a lot of issues with long term reliability with something
that operates 24/7 above 120C.
Have you looked at a Peltier junction that wo
In fact, you do not want to "update the crystal one million times/second".
The whole point of a GPSDO is to combine the excellent short term stability
of the crystal with the excellent long term stability of the GPS signal. If
you update the crystal in real time from the GPS data, you do not need t
I would like to find an emulator of the old voice synthesizer used in the
Atlanta airport subway. "The next stop is concourse A. The color coded maps
in this vehicle match the station colors." "This vehicle is leaving the
station, please hold on."
They replaced it in 1996 for the Olympics but I rem
Good point, and an example of how good digital filtering (helped with
upsampling) can make the design of the analog filter much easier :)
Reference the digital audio battles of the past century when 1 bit D/As running
very fast started replacing the expensive 16 bit audio DACs running at 44kHz.
I buy a lot of stuff from eBay and Amazon, including batteries on occasion.
Invariably, there has been a pretty good correlation between price and quality,
but considerably more so with batteries.
It really sucks paying $100 or more for a quality OEM laptop battery, but the
alternative is to t
I am out of town but will be back over the week end. All uploads will be sorted
by then.
Didier KO4BB
On October 11, 2016 1:54:06 PM EDT, Francesco Messineo
wrote:
>1818-2295A dump has been uploaded to ko4bb site, probably there's need
>to be moved in the right place before it's available.
>
Re: Manual uploads to my site:
I have limited internet access for another week. Uploads will be processed the
week of December 5th.
Didier KO4BB
On November 19, 2016 7:05:52 PM GMT+01:00, Mark Sims wrote:
>There was a copy uploaded to EEVBLOG. I uploaded it and another one
>that Atilla fou
There is a free tool (Robot Room Copper Connection) that will take EcpressPCB
files and spit Gerber files. It is actually a full fledged PCB design software
that seems to be significantly more capable than the ExpressPCB software even
though I have not used it as such.
Alternately you can send
"audiophile outlets"
You've got to be kidding but not even.
At least, nobody is forcing anybody to buy them...
Didier
Peter Gottlieb wrote:
>The current distortion from simple transformer-rectifier-capacitor
>power
>supplies contains a lot of third harmonic content. In a 3 phase system
>(as
A real treat would be to do the GPS receiver with tubes ;)
Didier
Joseph Gray wrote:
>>Otherwise you might just as well lock it up instead.
>
>Hmm, a 1970 vintage tube transmitter with a GPSDO frequency lock :-)
>
>Thanks to everyone for the suggestions. I will spend more time with
>this
>rig
John,
The SD Card issue is serious but not unique go the BBB. I believe there are
ways to configure any Linux distro to make the SD card read only, at the cost
of losing logging and data every time you power off. Alternately, one could
partition the SD card with a second partition just for data
That works well for transponders with o LY one signal. On commercial
satellites, each transponder is shared among multiple signals, so that would
not work.
Didier
Jim Lux wrote:
>On 7/3/13 2:21 PM, Dennis Ferguson wrote:
>>
>> On 3 Jul, 2013, at 11:47 , Bob Camp wrote:
>>> The pipe in this c
Marie Curie died at 66 of radiation related anemia. Not a bad age for the
times, particularly considering the amount of radiations her body must have
absorbed during her life.
Didier
lstosk...@cox.net wrote:
>I just finished Bernard Jaffe's history of chemistry book. The Curies
>spent years in
Jim said:
"It's like a HP 8663B (not the modern Agilent E8663).. very low noise,"
The Agilent E8663 has similar SSB phase noise spec as the older HP 8662A
(-144dBc/Hz @ 10 kHz with option UNY, versus -143 for the 8662). You seem
to imply they are different. Can you elaborate?
Of course, the Agil
Hui, you may want to check this page:
http://wiki.answers.com/Q/What_is_the_relationship_between_sievert_and_becquerel
Your English is much better than my Chinese, you are doing great, don't be
embarrassed!
Didier
On Wed, Jul 10, 2013 at 8:53 AM, Hui Zhang wrote:
> Hello Robert:
>
> I am a l
Remember that coordinates are absolute, but altitude is relative to the ground.
GPS knows your distance to the center of the earth, but it can only calculate
your altitude if it knows where the ground or sea is at your location. There
are several different earth models GPS receivers use to calcu
You probably meant "as an integer divider", you don't get a lot of spurs.
Didier
Bob Camp wrote:
>Hi
>
>If the DDS is acting pretty much as a divider you don't get a lot of
>spurs. The rest of the time there are spurs *somewhere* in the output
>spectrum. Put another way, there are thousands of "
Some of the small surface mount canned oscillators are actually pll and not
very good at that. I have a page about it somewhere on my web site.
Didier
KO4BB.com
Graham wrote:
>Good morning Joe (and all),
>
>I have been playing around with a few of these DDS modules as well as a
>
>couple of the
02 is definitely a distributor programmable unit.
>
>It is a digital synthesizer in a can with no effort towards clean
>output.
>
>PLL? They would not bother to put a cleanup PLL in the can for the
>intended microprocessor application.
>
>Tim N3QE
>
>On 7/21/13, Didier Jug
I am familiar with the Epson Seiko SG8002 series and nowhere does it say they
are programmable. They are not user programmable for sure, only the distributor
has the tools to do it. The data sheet does not have any information that would
be a hint that they are PLL's.
Http://WWW.KO4BB.com/Timin
There is a difference between managing the latency (as in ensuring that sound
and video are synchronized, but latency itself is acceptable) and minimizing
the latency as in a Morse code keyer where the operator has to manually control
the generation of elements that can be as narrow as 20mS (one
I believe the trend for the last 10 years has been to use a positive threshold.
I mess with serial ports all the time professionally and not and I do not
remember the last time I saw one that did not work with a positive threshold.
Didier KO4BB
Bob Camp wrote:
>Hi
>
>The gotcha with "standard"
26, 2013, at 4:52 PM, Jim Lux wrote:
>
>> On 7/26/13 12:50 PM, Didier Juges wrote:
>>> There is a difference between managing the latency (as in ensuring
>that sound and video are synchronized, but latency itself is
>acceptable) and minimizing the latency as in a Morse cod
> Hi
>>>
>>> There's also the time honored approach of generating the side tone
>off of the generated RF. In that case the latency to the transmitter
>would matter quite a bit. I have no idea *why* you would run the key
>through a computer in that case ….
>>
Some instruments (Tek 494 for instance) use a 100 MHz VCXO phase locked to 10
MHz for lower phase noise when multiplied into the microwave bands,
demonstrating that there is more than one way to skin a cat.
Didier KO4BB
Bob Camp wrote:
>Hi
>
>The math is pretty simple:
>
>The Q of quartz goes
Looking at the high price (and closed software) of what is currently offered, I
have been thinking of making a kit of my GPSMonitor (see KO4BB.com)
I think I could sell an assembled and tested kit with a 2x16 char display for
$60 or so if I get 50 people interested.
Of course, the source code i
y and those or $6.So you could assemble something for
>$20.
>
>What's going on is that TI builds tens of thousands of these and sells
>them
>at cost. It is really hard to DIY a uP on a PCB for less than a
>LaunchPad.
>
>
>On Sat, Aug 17, 2013 at 8:42 AM, Didier Juges
This is a repost with a new thread. Sorry for the bandwidth.
Looking at the high price (and closed software) of what is currently offered, I
have been thinking of making a kit of my GPSMonitor (see KO4BB.com)
I think I could sell an assembled and tested kit with a 2x16 char display for
$60 or s
Go up about 7 or 8 messages.
It is not a version of Lady Heather for the PocketPC, it is a monitor
software for the Thunderbolt that runs on certain PocketPC (those like the
iPaq that have a hardweare serial port). It is very far from the extended
functionality of Lady Heather, but useful as a heal
While I am at it, I will put a PPS stretcher and RS-232 driver on the same
board since a number of those lose TBolts are used for NTP. I should be able to
do that for the same price.
It seems that 25 ms positive going should be sufficient?
I have created a page to keep track of what I have promi
I can imagine creating a screen image as a jpeg and making it available via the
web server.
I have done that before for something else (a headless device.)
Didier KO4BB
Chris Albertson wrote:
>On Sun, Aug 18, 2013 at 10:11 PM, Eric Williams
>wrote:
>
>> Would be nice if someone did a Linux po
xactly
> what is needed and we don't need to write the client side software. Unless
> you'd want a custom display.
>
> I think the monitor should be able to run on atiny uP, something that cost
> $20 or so and use very little power, under 1W.
>
>
> On Mon, Aug 19
An even bigger problem is that once they decide they are not making enough
money with it, it won't even be available at any price.
Didier KO4BB
John Miles wrote:
>Don't you just love paying to access research that your taxes already
>paid
>for? Gives you a warm, fuzzy feeling all over. :-P
>
>
Frank,
You are welcome to upload the article to my web site's manuals pages:
Http://WWW.KO4BB.com/manuals
Didier KO4BB
Frank Stellmach wrote:
>Hi,
>
>Andrew Ludlow himself was so kind to send me the Sciencexpress article,
>
>just a few minutes ago..
>
>A pity that I can't post it here (2.2M
In the first post, you state "*While I can offer some proof of operation
for qualified TimeNutters,
Allen Variance Noise and sigma-tau phase noise are difficult parameters to
test without an acceptable reference,
so I offer a 14 day acceptance trial to vetted buyers*."
Which could be interpreted to
Jim,
You should be able to piggyback a second serial port in parallel with the one
used by NTP (just the Rx line and ground) and use any NMEA decoder.
It does not even have to be the same computer.
I have a quick NMEA decoder for Windows I wrote some time ago somewhere.
Didier KO4BB
Jim Lux
With all that discussion about the old temperature sensor in the TBolt no
longer being available, it would be easy to program a small microcontroller
like the Silabs C8051F300 to emulate the old Dallas part. The chip costs $2.32
in unit quantity. It has an I2C transceiver, an analog/digital conv
As always, be careful with the hard and fast rules. Most crystal oscillators
generate sine waves first, but if the oscillator is part of a GPSDO, it will
have to be converted to square to be processed by the logic within the GPSDO,
so even if the device has a sine output, there will be a square
Max,
This is a very interesting project and well documented, thank you!
Didier KO4BB
David J Taylor wrote:
>Among my time nut toys is a Consumer grade GPS clock and a similar WWVB
>clock. The WWVB clock consistently runs about 0.2 seconds ahead of the
>GPS
>one. I know no one can say why with
"It would seem that you need two counters that share the same gate."
That seems to be the best solution, but I am not aware of any off-the-shelf
counter that does that.
If you only need to count to 200MHz, you could do that in an FPGA. Would
not be too expensive, just buy one of the many available
In order to test my upcoming Thunderbolt Monitor, I developed a small piece
of software to allow me to generate controlled Primary and Supplemental
timing packets per the Trimble spec.
I think the result may be useful to those who own Trimble Tunderbolt
monitoring tools, so I decided to make it ava
Gerhard, please send me the data sheets and I will post them on my site
with the other manuals.
Thanks
Didier KO4BB
www.ko4bb.com
On Mon, Oct 28, 2013 at 7:30 AM, Gerhard Wittreich
wrote:
> In my quest to add an MTI 240 OCXO to my TS-2100 I ended up buying one on
> eBay only to realize that
It all depends on how accurate the frequency has to be. If you only need
2%, I would use a C8051F300 microcontroller's built-in oscillator (24.5MHz
+/-2%) and divide it down using the processor itself.
The chip comes in a 11 pin QFN that is 3x3 mm, a little bigger than you
need, but it does not req
I have actually used these chips at 125C and the factory even gave me
extensive data supporting even higher temperature operation (for missile
applications,m can't tell you more). Don't know about 150C though. That is
pretty high.
On Sat, Nov 2, 2013 at 8:36 AM, Didier Juges wrote:
The C8051F300 also has a built-in temperature sensor and ADC, so you could
probably implement temperature compensation without any additional
component if needed.
On Sat, Nov 2, 2013 at 8:37 AM, Didier Juges wrote:
> I have actually used these chips at 125C and the factory even gave
You want to drive the RTC with an external PPS to get time/date into an Arduino?
Why not feed the PPS to the Arduino and have it compute date and time?
It is really not that hard to count seconds. You don't really need an external
chip to do that.
Didier KO4BB
Russ Ramirez wrote:
>I'm thinkin
Hi Russ,
I will venture that the vast majority of applications are served with 2 pins
and a $0.10 crystal rather than the external silicon implied by a 1Hz input.
The advantage of off-chip timekeeping is the low power consumption of dedicated
RTC chips that makes them able to run from a coin ce
For a non Time-Nuts application, I needed a narrow bandpass filter that would
provide essentially zero phase shift (no more than 10 or 20uS was desired) over
a frequency range of 55 to 65 Hz while providing useful reduction of the
harmonics, particularly in the range of 400 to 1kHz. This was to
"Turns out that professional gear for this does not do time-stamping in
this regard. Rather, they I-Q demodulate the signal with a reference
signal at the nominal rate, low-pass filter it and pay attention to
details of filtering like group-delay and compensation thereof."
It makes sense to me. Th
Tom,
Don't confuse everybody with facts, we had a good thread going :)
The PicPet is holding its own very well in that application.
I am surprised at the effect of the laptop supply. I would have certainly
expected effect on phase noise (smaller taus), but not that close to the
carrier. Do you
"Alternatively you can put mains through a 40-60 or 50-70 Hz
bandpass filter to suppress anything but the fundamental"
The problem with any filtering is precisely that the phase shift through any
filter is highly dependent on the actual signal frequency, so if your purpose
is timing, the filter
One thing to keep in mind is that isolation through shielding usually
results in much greater capacitance to ground (actually to the shield) from
both input and output windings.
Therefore, the actual isolation in practice is totally driven by how good
the ground to the shield is.
At RF, any induc
Must have been Allen Bradley :)
Same problem here with military equipment!
On Thu, Nov 21, 2013 at 4:17 PM, Robert Atkinson wrote:
> May be a bit of drift and reading back to front. Some years ago we bought
> a quantity of moulded carbon compostion resistors from a top US
> manufacturer. A sampl
The Thunderbolt uses single precision floating point and digital filtering for
temperature so yes, you are going to see values like this. This is not unusual
(precision clearly out of step with accuracy), like the HP network analyzers
returning gain in dB with 4 decimals at microwave frequencies
Feel free to upload the srec file if it works :)
Didier KO4BB
Anton Kapela wrote:
>Rob,
>
>On Sat, Dec 28, 2013 at 11:00 PM, Robert Watzlavick
> wrote:
>> Are you talking about the archive named DatumET-6000TS-2100.zip and
>the file
>> named Tymserve.bin?
>
>Indeed, that's the file.
>
>> If so
Since I had a couple of spare RS-232 driver gates, I built a simple PPS
extender/level shifter in my Thunderbolt Monitor kit. It is not as general
purpose (not configurable) as the Fat PPS kit from TAPR, but it works well for
the Thunderbolt. You could easily build the circuit on a piece of perf
I may have posted this link before. It is on topic, even though I was using
coax cable:
http://ko4bb.com/Test_Equipment/CoaxCableMatching.php
It would be easy to do the same experiment with cat-5 cable. I would expect the
pictures to look somewhat similar.
Didier KO4BB
Tom Van Baak wrote:
>
How about free software?
http://www.ko4bb.com/ham_radio/Clock/
If you want a piece of hardware, my Thunderbolt monitor could relatively
easily be convinced to display UTC and local time on its two line display.
Some coding would be required.
http://www.ko4bb.com/Timing/GPSMonitor/kit.php
Didier
.
>
> BTW great web site I have found a lot of good information here
>
> Paul.
>
>
>
>
> On 1/22/14 5:43 PM, Didier Juges wrote:
>
>> How about free software?
>>
>> http://www.ko4bb.com/ham_radio/Clock/
>>
>> If you want a piece of hardwar
Hi Dick,
"They look very nice, but kind of big for my desktop !!"
Not very clear about what message you were responding to...
Didier
On Wed, Jan 22, 2014 at 4:19 PM, Richard Solomon wrote:
> They look very nice, but kind of big for my desktop !!
>
> Thanks anyway,
>
> 73, Dick, W1KSZ
>
>
>
>
I would support a leap minute. It will still be far enough in the future that I
will not have to deal with it :)
But then we would lose that wonderful subject of conversation and we would lose
the practice of doing it somewhat regularly. I can see that the lack of
practice could easily make it
You are always welcome to upload time-nuts related material to my manual
site www.ko4bb.com
Didier KO4BB
On Dec 14, 2017 1:03 AM, "Ulf Kylenfall via time-nuts"
wrote:
>
> Tried to mail the pictures to Magnus. The mail bounced back.
> Ole Petter Ronningen was kind to also offer space for themand
I am so glad that my laziness has a new name that does not sound nearly as
bad as the original one...
I will be sure to remember that next time I do my "self appraisal".
Merry Christmas everyone (I know I am early but my clock is fast...)
Didier KO4BB
On Thu, Dec 21, 2017 at 2:08 AM, Mike Cook
What do you mean by “Adafruit” pinout?
On Fri, Feb 16, 2018 at 11:50 AM Mark Sims wrote:
> No, the Tbolt does not have a separate receiver board... plus its' GPS is
> rather special... the RF chain is locked to the OCXO so it does not produce
> any sawtooth error.
>
> The Lucent KS firmware expe
Got the answer in the previous email :)
On Mon, Feb 19, 2018 at 5:28 PM Didier Juges wrote:
> What do you mean by “Adafruit” pinout?
>
> On Fri, Feb 16, 2018 at 11:50 AM Mark Sims wrote:
>
>> No, the Tbolt does not have a separate receiver board... plus its' GPS is
>
It depends on the quantity they buy. I just looked for X7R 0.1uF in 0805 at
Digikey and the automotive grade (10%, -55 to +125) is cheaper than the non
automotive grade with worse tolerance and more limited temperature range.
Next time you buy it may be reversed...
On Feb 25, 2018 1:51 PM, "Gerhar
I like the sound card idea. However I believe it's much better to use the
two channels. At least under Windows, it is much easier to track the
relative phase of the two channels of one sound card than the absolute
phase of one channel compared to the system clock.
I have written an audio VNA in Vis
Tom,
In my TB monitor kit, I used your Julian date routines, adapted to the 8051
(no variable greater than 32 bits since my compiler does not support them
either) to apply the GPS offset correction.
It was very helpful.
Didier KO4BB
On Wed, Mar 28, 2018, 7:13 AM Tom Van Baak wrote:
> Hi Mark,
A shield will definitely help with differential mode noise (the USB
communication signal) but has little effect on common mode noise (the
digital stuff coming from other parts of the circuit), a choke is the fix
for common mode (if you can't get rid of the noise at the source, or
otherwise return c
TCXO usually refers to Temperature Compensated Crystal Oscillator (no heater),
as opposed to Oven Controlled Crystal Oscillator (OCXO) which has an oven.
I would not expect a TCXO to become warm or draw more current at power up. An
OCXO would.
Didier KO4BB
On December 21, 2016 1:29:00 PM CST, M
Hopefully that will be tomorrow.
Didier KO4BB
On December 27, 2016 2:37:23 PM CST, GandalfG8--- via time-nuts
wrote:
>I have just uploaded this firmware to Didier's (KO4BB) manuals site so
>it
>should be available for download in the near future.
>
>Regards
>
>Nigel
>GM8PZR
>_
I have C code (for the 8051) that is simply the translation of what's in the
app note. It does temperature and humidity but not the barometric pressure (no
double precision float on that compiler).
Works exactly as advertised. I have two.
You can see one in action here:
http://www.ko4bb.com/tp
I use Copper Connection, a $50 package (PWB layout only) that works very
well for me.
There is a free eval version that has some limitations.
Didier KO4BB
On Jan 19, 2017 11:01 PM, "Richard (Rick) Karlquist"
wrote:
> Off topic, but probably a lot of disgrunted Eagle users on this list.
> Its o
Well worth mentioning that you have found a reputable vendor. I may give
them a try.
A while back, I bought a dozen 18650 inexpensive(<$5 each) cells from 3
vendors picked at semi-random on eBay (4 from each) for evaluation and I
tested each one of them with a data logger.
The best one had about h
Yes, I noticed that before.
I have a number of tools that don't like running off a Dropbox folder,
including several software development tools for starter. Too many files
opened at the same time.
Don't assume that because it looks like a normal folder, it works like one,
even though for many thing
One issue with power factor corrected power supplies is that in the short
term (as a minimum, at the line frequency), they do behave like resistors
(current goes up when voltage goes up) but as they have a slow voltage
regulation loop to provide regulated output, they do behave like constant
power
The good news is that for oven control, you can typically filter the heck
out of the data and the noise may actually help you with dithering if it's
fairly random, so you should be able to get close to the specs. The main
thing you need is stability, linearity should not be a factor. One
limitation
The difficulty with hydrogen is to keep it where you want it. It does not
take very much for it to leak out (or in, as the case may be)
On Jun 8, 2017 4:58 PM, "Alan Melia" wrote:
> Hi Bob, it also depends on what you allow to leak into the vacuum.
> Hydrogen is a pretty effective remover of hea
If that is not time-nutty, I do not know what will :)
On Jun 20, 2017 7:04 AM, "jimlux" wrote:
>
> for geodetic measurements, they drill a hole down to bedrock, and run a
> pipe down to anchor the antenna to the bedrock.
>
> "All holes shall be drilled straight enough so that PVC casing can be
>
I have been forced to use micro-D by a customer on a military power supply,
not even space rated, it was well over $100 each in 50 piece quantity (I
think it was a 25 pin).
However, unless they are mistreated (which is easy for the reason you
listed), they seem reliable. I do not believe we have r
That is very good information. I will add your email to the 5370 page on my
web site.
Didier KO4BB
On Jul 18, 2017 4:02 AM, "Thomas Allgeier" wrote:
> Hello All Again,
>
>
>
> I’ve got my 5370B going now and in the process made a “discovery” which I
> thought might be worth sharing:
>
> The A3
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