Got it, thanks, Warren. Don't know how long 'till I get to installation,
but wanted to be prepared.
Don
ws at Yahoo
> Yes, RTS is the other pin.
>>From 'Heather.txt' {Helper} file
>
> Added ability to actively stabilize the device temperature.
> (/TT=degrees or TT command line option).
> Uses the
I received the following message from John Lowe at NIST.
I thought it might be of interest to you.
-Original Message-
From: John Lowe [mailto:l...@boulder.nist.gov]
Sent: Monday, July 09, 2012 12:55 PM
To: Ron Ward
Subject: Re: Phase-locking 60 kHz timing and frequency standard
receivers
Hi:
Where is LORAN when you need it?
I realize that if the flare is big enough LORAN would also have
problems.
Wouldn't it be nice if decision makers were required to be engineers?
Ron
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ma
On Fri, Jul 13, 2012 at 09:47:12PM -0700, Brooke Clarke wrote:
> Hi:
>
> The key thing GPS is lacking is Daylight Savings Time.
>
> WWV & WWVB have the DST bits that allow a clock to show the local time.
And that is important for most routine civil human use.
Nor something that
Hi:
The key thing GPS is lacking is Daylight Savings Time.
WWV & WWVB have the DST bits that allow a clock to show the local time.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
___
time-nuts mailin
d...@dieconsulting.com said:
> There are innumerable applications for low cost low power human level 1
> second accurate time of day in modern electronic systems - examples are
> traffic lights and school crossing signs and water sprinklers and street
> lights and other outdoor lighting and many o
I read about it yesterday. I suspect that we may already be seeing
some radio interference. At work this afternoon, my cell phone lost
signal entirely a few times. Although I don't get a great signal at
work, it has never lost signal completely before.
Joe Gray
W5JG
On Fri, Jul 13, 2012 at 8:50 P
On Sat, Jul 14, 2012 at 02:38:34AM +0200, Magnus Danielson wrote:
> I think the PTTI article isn't as much documentation as presentation of
> general principle, showing details more as to present how it can be
> done, but not necessarily guarantee it will be done that way. Knowing
> the synchro
Has anyone ever used an Lock-in Amplifier such as
a PAR HR-8 or later models as part of a receiving
system for WWVB? These are mostly used in detecting
weak signals in noise in scientific experiments. Some have used
the analog output to phase lock a voltage controlled
oscillator to the input s
Yes, RTS is the other pin.
>From 'Heather.txt' {Helper} file
Added ability to actively stabilize the device temperature.
(/TT=degrees or TT command line option).
Uses the serial port RTS and DTR lines.
RTS is the temperature controller enable (+12=off, -12=on)
DTR is the heat (-12V) / cool (+
There was a blurb on the news tonight about a big honkin' solar flare that is
due to arrive around 6:00 AM tomorrow morning. It's supposed to be strong
enough to produce auroras visible as far south as the Gulf of Mexico and to
mess up GPS...
As someone pointed out, it is dependent on where you are, as well as a number
of other factors.
I've got a nice chunk of concrete tied to bedrock about 10' below the surface
with a thermal variation that is below the threshold of the thermometer i have
there.
Since I need to put something e
Don't bother with the concrete, just put the dirt back. You can even
just bury a vault with a lid under about 2 ft of dirt, will work just
fine.
Don
Chris Albertson
> I've got a foundation trench open right now. I've been thinking it is a
> great opportunity to keep some electronics at a very sta
So the other signal is on pin 7, RTS?
Don
ws at Yahoo
> Don
>
> No, it is not bang-bang. Look at the plot results.
> You don't get .001 deg type resolution and control with a bang-bang
> controller.
>
> It is a full Linear, universal, PID + with self tuning capability.
> The output is a high reso
On 07/14/2012 01:49 AM, David I. Emery wrote:
On Wed, Jul 11, 2012 at 03:48:52PM -0400, paul swed wrote:
David
Read your comments and have been traveling. So finally a chance to email.
I read the document also and walked away with what I shared.
In your reading would you believe the following
I've got a foundation trench open right now. I've been thinking it is a
great opportunity to keep some electronics at a very stable temperature.
What's better then tossing it in a big hole in the ground then dumping a
truckload of concrete on top? Likely the only thing I'll burry is a $2
temper
You have to go deep into the ground to get stability.
At 15 metres deep there is a lovely pure sine wave of about 0.3C P-P.
I measured it on the roof of a cave, its period one year.
My design for the bolt is to put it in a 1/4 inch thick aluminium box which
is held at a constant temperature by a
On Wed, Jul 11, 2012 at 03:48:52PM -0400, paul swed wrote:
> David
> Read your comments and have been traveling. So finally a chance to email.
>
> I read the document also and walked away with what I shared.
> In your reading would you believe the following.
> Its an absolute phase and that when
Don
No, it is not bang-bang. Look at the plot results.
You don't get .001 deg type resolution and control with a bang-bang controller.
It is a full Linear, universal, PID + with self tuning capability.
The output is a high resolution Linear PWM driving one of the RS232 pins and a
polarity/enab
Thanks, Warren, for the refresh. So the L.H. fan control signal is
bang-bang, and not really a PID, as it's on the DTR data line.
Don
ws at Yahoo
> Don
>
> no internal connection needed.
> Lots of ways to do it,
> an isolated optical isolator connect to a couple of pins on the RS232
> connector is
Don
no internal connection needed.
Lots of ways to do it,
an isolated optical isolator connect to a couple of pins on the RS232
connector is one way.
The LH controller can also be used to just Heat for those that don't like
moving parts,
or dual with heat and cool as well as just drive a fan
Hi: Been following the latest Thunderbolt thread a littlt more closely
than previous ones. Mention was made of Lady Heather driving a fan with
PID. I looked at the LH website and what I have for tbolts. Where is the
fan control physically hooked? An internal mod? I admit I may have
allowed this inf
I second that, when done correctly, it works great. But there are all kinds of
ways to do it poorly.
First off,
What the TBolt is best for is to provide great long term frequency stability
that can be better than a Rb or Cs.
If you want a low phase noise signal without spurs,
Don't use the Tb
I've oft considered bolting one to the cement wall in my basement, which is a
very nice, very stable 57deg F just to see how it holds.
On Jul 13, 2012, at 14:36, "Don Latham" wrote:
> You can get one of these at any large truck stop :-)
> Don
>
> Peter Gottlieb
> Now I
>> suppose one cou
You can get one of these at any large truck stop :-)
Don
Peter Gottlieb
Now I
>suppose one could put it into a highly insulated container with a
>bidirectional Peltier temperature controller (I have some larger
>examples of those), but really was wondering if there was an easier
> wa
Hi
The TBolt is rated to 70C. It's a good bet that the OCXO is heating the crystal
to > 85C.
Bob
On Jul 13, 2012, at 11:09 AM, Peter Gottlieb wrote:
> What temperature does it try to maintain internally for the OCXO? If
> the external temperature is too close or over that temperature the
What temperature does it try to maintain internally for the OCXO? If
the external temperature is too close or over that temperature the
internal regulation loop won't work.
On 07/13/12, Bob Camp wrote:
Hi
There's no real need to keep the TBolt at / below room temperature. A
Hi
There's no real need to keep the TBolt at / below room temperature. A constant
temperature in the 40 to 50C range works just fine. There's nothing inside
that's going to take a major reliability hit from that sort of temperature.
Bob
On Jul 13, 2012, at 10:17 AM, Peter Gottlieb wrote:
> O
Oh, I have no vibrations from lorries, I'm all the way across the ocean. ;)
My thought was to mount it in a constant temperature enclosure via thermal
insulating standoffs. The enclosure could be a PID controlled Peltier CPU
cooler run box, something COTS pretty much.
Peter
On Jul 13, 2012, a
Apply the Peltier to the cabinet.
Or put the Tbolt in a fridge.
Mount the Tbolt on a granite slab inside the cabinet so lorries won't
affect it.
On 07/13/2012 04:55 AM, Azelio Boriani wrote:
Peltier cooler on top of the OCXO or on top of the TBolt?
On Fri, Jul 13, 2012 at 9:54 AM, Chuck Forsb
Hi
If you want to isolate things, the answer is fairly simple. Get a water cooler
system (like on a high end PC) and adapt the cooling block to a metal box that
goes around the TBolt. Put the pump and fan a good ways away and run them on an
isolated supply (as in independently regulated. I *ass
On 07/13/2012 02:06 PM, Peter Gottlieb wrote:
What caused me to pose the original question which started this thread
was that I noticed that the correction required very strongly tracked
the operation of my HVAC system operation. Since the Thunderbolt is so
sensitive to ambient t
What caused me to pose the original question which started this thread
was that I noticed that the correction required very strongly tracked
the operation of my HVAC system operation. Since the Thunderbolt is so
sensitive to ambient temperature and air movement, I thought that
getti
Peltier cooler on top of the OCXO or on top of the TBolt?
On Fri, Jul 13, 2012 at 9:54 AM, Chuck Forsberg WA7KGX N2469R
wrote:
> How about a thermostatically controlled Peltier cooler?
>
>
> --
> Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com
> Developer of Industrial ZMODEM(Tm) fo
How about a thermostatically controlled Peltier cooler?
--
Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-
saidj...@aol.com said:
> We deal with big fans all the time, viz. Turboprop engines running at up to
> 2000rpm. Generates nasty massive spurs below 100hz.
2000 / 60 is 33.333 Hz
One man's noise is another man's signal. (Or something like that. I think I
picked it up here, ages ago.)
How hard
36 matches
Mail list logo
