Greg,
the only power source I am aware off that can provide the ~5W power
required by that Novus box for 10-12 years with 20lbs weight limit without any
external power sources or maintenance is a radioisotope thermoelectric
generator (RTG) such as those used on Spacecraft. The Russians
Sounds like a space based systemPerhaps those mining probes
Sent from my iPhone
On Jun 14, 2013, at 2:11 AM, saidj...@aol.com wrote:
Greg,
the only power source I am aware off that can provide the ~5W power
required by that Novus box for 10-12 years with 20lbs weight limit without
On Thu, 13 Jun 2013 18:15:25 -0600
Gregory Muir engineer...@mt.net wrote:
Most of the problems have been solved including the power source.
This is not your typical kitchen table project. And, as new frequency
references are developed and the design feasibility phase is still open,
small
I thought the Junghans Mega clock used DCF-77 rather than WWVB?
Regards,
David Partridge
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of ewkeh...@aol.com
Sent: 13 June 2013 22:27
To: time-nuts@febo.com
Subject: Re: [time-nuts]
On 14 June 2013 05:48, Perry Sandeen sandee...@yahoo.com wrote:
There are two long standing truths about
electronic equipment. One you can’t have
too much filter capacitance. Two, you
can’t cool too much. (Please spare me
the liquid nitrogen or submarine battery
comments.)
Regards,
In the nineties Junghans decided to introduce their products in the US.
Three products, a watch with stainless steel case and dial and LCD display,
antenna in the leather band, a Mega with 5 inch dial and LCD display and a
Mega with LCD only display. As part of the development effort they
Bob I agree the comment was on the 3586 mod not the gpsdo.
As I recall Bert would send a programed proc. I bought one from him for not
much.
Regards
Paul
WB8TSL
On Fri, Jun 14, 2013 at 1:03 AM, Bob Stewart b...@evoria.net wrote:
Perry,
Could you give me some context for your post? Is this
I thought the Junghans Mega clock used DCF-77 rather than WWVB?
Regards,
David Partridge
There are a number of different models of Junghans Mega clocks, from desk
clocks to wristwatches. The ones sold for the USA market receive WWVB.
/tvb
___
Talking of Cooling HP 5370's, I have a 12V fan Gorilla taped to mine fed from a
wallwart.
Not elegant, but it has reduced the heat sink temperature dramatically.
Is anyone else concerned about the heat sink temperature on the 5370?
Has anyone done a fan modification they would care to share?
I like that explanation. I think I get it.
I don't think it is likely to cause me any worry.
My actual measurement of ADEV on my VE2ZAZ device
gave me a 100,000s sigma of just under 1E-10
and that works for me (best is at 1000s, 4E-11).
Maybe the strength and the danger of the VE2ZAZ
design
Well, it 'killed' my two. The website for the manufacturer of mine (both
SkyScan, cheap from Sam's) stated that there was a problem with WWVB.
I'll keep an eye out for a replacement.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf
I did call spectracom just to see if they had any parts for the 81XX
series. They said they had not had any for 10 years. The Guy was helpful.
But those magical 60Khz xtals aren't to be had.
Regards
Paul
WB8TSL
On Fri, Jun 14, 2013 at 10:37 AM, J. L. Trantham jlt...@att.net wrote:
Well, it
As you drive down the road it is important that you do not over correct
errors and look ahead and start turning before the car reaches the turn,
your corrections have a delay in taking effect as well as a delay in knowing
where on the road you are. You know where the car was but more important
About the HP5370 please got o see my solution to:
http://www.timeok.it/files/hp_5370a_temperature_solution.pdf
Luciano
timeok
see : www.timeok.it
On Fri, Jun 14, 2013 at 4:26 PM, Mark C. Stephens ma...@non-stop.com.auwrote:
Talking of Cooling HP 5370's, I have a 12V fan Gorilla taped to mine
Joe,
All of the SkyScan clocks I know of have failed. I have two of them
that no longer work. However, I have two made by Junghan's that seem
to be fine. Take a look at www.junghansUSA.com
Burt
Subject: Re: [time-nuts] Spectracom 8170 Time of Day grief...(WWVB
Clock)
Well, it
Burt,
I saw that earlier.
I am hoping to find a wall clock.
I wonder what it is about the SkyScan clock that makes them fail. I doubt
they phase lock the signal but they might. I think all the data is AM
modulated, IIRC.
Thanks.
Joe
-Original Message-
From:
Re: HP5370B cooling.
I currently have three HP5370B's that have been running for many months in a
cool room (typical room temperature is under 20 degrees C even in the summer)
so far without issues.
Other than placing them away from other heat producing equipment and and double
checking
Hi
The cheap La Crosse wall clocks seem to do fine with the new WWVB format.
http://www.amazon.com/La-Crosse-Technology-WT-3128U-12-Inch/dp/B0039O6W88/ref=sr_1_16?ie=UTF8qid=1371230316sr=8-16keywords=la+crosse+clock
Is one, there are an enormous number of different models. I suspect that they
Luciano wrote:
About the HP5370 please got o see my solution
The fans would cool the transistors better if they were blowing on
the heatsink fins, not directly at the transistors.
I use a slow fan that is large enough to blow over the whole heatsink
assembly. You can't hear it over the
Hi,
I'm looking for an old french diseration, which doesn't seem to be available
electronically (at least i couldn't find it anywhere) and none of the libraries
in switzerland seem to have it. Unfortunately, the author died a year ago,
so i cannot contact him directly anymore.
If anyone has an
Most RTG sources use Plutonium 238 or Strontium 90. Primary decay component
is Alpha particles which can be stopped dead by a few mm of shielding.
Good article on Wikipedia:
http://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator
Dave
-Original Message-
From:
Attila wrote:
Hi, I'm looking for an old french diseration,
which doesn't seem to be available
electronically (at least i couldn't find it
anywhere) and none of the libraries in
switzerland seem to have it. Unfortunately, the
author died a year ago, so i cannot contact him
directly
Attila,
a quick look at the système universitaire de documentation website
list the university libraries where a paper copy is available for loan:
http://www.sudoc.fr/008747431 (click on the Où trouver ce document?
link at the top) :
AIX-MARSEILLE 1 - BU Sci.St Charles
BESANCON - BU Sciences
Current Thunderbolt GPS shows:
APP: 2.2 11 Mar 2002
GPS: 10.2 14 Nov 2001
Mfg: 07 June 2002
I previously owned another
APP:3.0 27 June 2002
GPS: 10.2 14 Nov 2001
Mfg: 21 Mar 2003
The two apparently were manufactured within 3 months of one another.
Some questions:
1) What is APP and what does
The two apparently were manufactured within 3 months of one another.
I'd say 9 months. The firmware revision from 2.2 to 3.0 is the
3 months you mentioned and from what I could gather ( which may
or may not be correct) mainly changed the algorithm for handling
carryover and unless you're
Thanks.
On 6/14/2013 23:22, Arthur Dent wrote:
The two apparently were manufactured within 3 months of one another.
I'd say 9 months. The firmware revision from 2.2 to 3.0 is the
3 months you mentioned and from what I could gather ( which may
or may not be correct) mainly changed the algorithm
Gang,
I took a look at the WWVB signal using a 1:1 Lissajou signal the same
way I do for the FMT's. Using a 10:1 scope probe I sampled off the
output of the pre-amp in the 8170 and fed it into a HP-3586B tuned to
60 kHz and compared the resultant I.F. against a HP-3336A tuned to
the 15625
On 14 June 2013 20:24, Claudio Girardi claudio.gira...@virgilio.it wrote:
Unfortunately, as far as I understood, you need to be a student at a French
university for obtaining an interlibrary loan.
The global French libraries catalog (http://ccfr.bnf.fr) does not list any
additional (i.e.
On 6/14/13 10:55 AM, DaveH wrote:
Most RTG sources use Plutonium 238 or Strontium 90. Primary decay component
is Alpha particles which can be stopped dead by a few mm of shielding.
Good article on Wikipedia:
http://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator
Dave
but not
As an alternative to the Net4501, the AM335x in the Beaglebone has
timers that accept an external clock up to 25 MHz (TCLKIN) and can
timestamp events on an input pin (TIMER4-TIMER7). Both sets of pins are
available on the headers after an appropriate pinmux configuration.
I'm finishing the
Burt
Yes this has been looked at before by time-nuts and as you say it shifts.
Its also documented by nist and unfortunately the AM code is nothing like
the new psk code for a good reason. Better noise immunity and other things
also documented. Its complex at least for me. Overall I get it but
What I saw was the phase of the WWVB signal shifting back and forth
180 Degrees coincident with the dips in the carrier. Coincidentally,
this is what all of you have been telling me, but, just the same, it
was interesting to watch. The duration of each shift obviously are a
form of zeros,
More like what I'm looking for.
Thanks.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bob Camp
Sent: Friday, June 14, 2013 12:21 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Spectracom
Since the topic of WWVB came up again, here's another idea.
A number of people still want to use (hp, or Tracor, or) Spectracom WWVB
receivers as frequency standards or to maintain NIST traceability. As has been
discussed on the list, these receivers no longer work now that the enhanced
WWVB
The software already exists to do this. It is included with the standard
NTP source code in a directory called (from memory) test. It was
designed to test the time code clock driver.
You are right it is not complex, you can read the code and see how it was
done.
On Fri, Jun 14, 2013 at 6:45
My HP-3336A was purchased from an auction (not eBay) and came out of
a Southern California lab that was shutting down. The small heat
sink ran awfully hot. I added a larger heat sink and it eventually
became pretty hot also. What I discovered was the line voltage was
set to 100 volts, not
List,
My reply to Javier Herrerojherr...@hvsistemas.es
P Double
the 10 MHz to 20 MHz.
P With
another circuit of 74HC390’s divide 10 MHz to 200 KHz. Then double it twice to
800 KHz with LM 1496
DBM’s. Apply the two frequencies to a LM
1496 DBM and use a LPF to get the 19.2 MHz.
P
Can you explain what is different in this approach versus the
traditional gps/pps without needing a custom clocksource?
On Fri, Jun 14, 2013 at 8:13 PM, Gabs Ricalde gsrica...@gmail.com wrote:
As an alternative to the Net4501, the AM335x in the Beaglebone has
timers that accept an external
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