Ilia
Circuit diagrams are posted here from time to time, so it should be OK.
Bruce
On Saturday, 5 November 2016 7:02 PM, Ilia Platone
wrote:
Hi, and thank you for these suggestions.
Currently this project becomes reality (slowly): this kind of
synchronization/grabbing is very interes
Hi, and thank you for these suggestions.
Currently this project becomes reality (slowly): this kind of
synchronization/grabbing is very interesting, but I need something fast
(I expect the SPAD with active quenching circuitry could output 30ns
pulses, and the quantization frequency I hope to r
Yes, you might need a separate dedicated chip to take in the serial input
steadily. Although you may not. Many serial ports have a small buffer to
prevent missed serial input when the operating system gets distracted with
something other than processing serial data.
On 11/4/16 6:56 PM, Bob Stewart wrote:
In the general case, is the impact of changing the ambient temperature around
an OCXO from, say, 40C to 41C the same as changing it from 41C to 40C all else
being equal? IOW, if I somehow have the same temperature ramp over the same
time period in both d
On 11/4/16 5:27 PM, Richard (Rick) Karlquist wrote:
On 11/4/2016 4:04 PM, Poul-Henning Kamp wrote:
Historically resonance cavities were used so that step/avalance
diode multipliers had enough power to excite them. Today we have
semiconductors which work at those frequencies.
A great deal of
List
Time may be relative, but physicists are a stickler for accuracy.
While many of us may give a few minutes’ grace to the timepieces in our homes,
one group of scientists has successfully synchronized a pair of optical clocks
to within a million billionths of a second.
By measuring time to
On Fri, Nov 04, 2016 at 06:53:53PM -0500, David wrote:
> On Fri, 4 Nov 2016 18:43:03 -0400, you wrote:
>
> >...
> >
> > There HAVE been attempts to deliberately jam cable distribution
> >satellites... mostly the EIRPs used for distribution signal uplinks
> >make this a bit difficult, but it ha
I suspect the multitasking aspect of the OS will give you far more jitter than
one could cope with.
> On Nov 4, 2016, at 22:46, Casey L. Jones wrote:
>
> Maybe you could use something like a serial to parallel converter chip or the
> serial port input of a microcontroller. You could feed in
Maybe you could use something like a serial to parallel
converter chip or the serial port input of a microcontroller. You could
feed in a constant string of zeros until an event, and then feed in a one
to the stream when the event occurs. You could save the stream of ones and
zeros in memory fo
I recently got in a KS24361 system to test Lady Heather with. I was having a
terrible time talking to it. Lady Heather would detect it (at 19200,7,O,1 on
the GPS box, 9600,8,N,1 on the non-gps box). Nothing I did would get it to
accept commands. Turns out that the GPS box speaks SCPI at 1920
OK, never mind. I see the obvious. Phase changes faster at a higher frequency
than it does at a lower frequency.
Bob
-
AE6RV.com
GFS GPSDO list:
groups.yahoo.com/neo/groups/GFS-GPSDOs/info
From: Bob Stewart
To: Discussio
Rick on the pll DRO I agree with you for today.
So is it built for 9180 and then the 12.63 is mixed with it? Or is it
actually a direct PLL precisely at the frequency so not even the
synthesizer is used?
Regards
Paul
WB8TSL
On Fri, Nov 4, 2016 at 9:40 PM, bownes wrote:
> Not to mention there is
I have a scintillator that will pick up a small piece of uranium ore from
several feet away. I just checked some Rb lamps and cells and got no response.
Every single fireplace that I have checked sends the scintillator off into
clicking heaven. Apparently firebrick is rather hot stuff in more
In the general case, is the impact of changing the ambient temperature around
an OCXO from, say, 40C to 41C the same as changing it from 41C to 40C all else
being equal? IOW, if I somehow have the same temperature ramp over the same
time period in both directions, will I wind up with the same f
I guess what I heard so far sounds normal on start.
Just the green power led.
Then it warms up and takes a long time up to 48 hours to acquire the
satellites if it has no battery backup and has been off a long time.
Not sure when the messages go active.
Regards
Paul
WB8TSL
On Fri, Nov 4, 2016 at 9
The problems with the Z3801 (and Z3812 / KS23xxx) devices is they expect the
leapsecond to occur at the end of March/June/Sept/Dec. So if the leapsecond is
announced more than 3 months in advance they calculate the wrong day of the
leapsecond. I suspect that they would mess up any leapsecond n
Not to mention there is not so sensitive film, sensitive film and really
sensitive film.
Good old orthographic film took minutes in bright light.
> On Nov 4, 2016, at 20:24, Poul-Henning Kamp wrote:
>
>
> In message , David writes:
>
>> Various online sources say that natural rub
Have you tried a loop back connection, short pins 2 and 3 and a terminal
program? You may have to disable hardware handshaking in hardware
manager for that USB device or possibly a baud rate problem.
Mike
On Fri, Nov 04, 2016 at 08:23 PM, Dave Hallidy wrote:
Hal-
I took your suggestion a
I have had an HP 58503A GPSDO with the Option 001 display running
continuously for over ten years without a problem-that is, until today. When
I looked at it this morning, the display was showing a valid time, but it
was frozen and not advancing. Pushing on the buttons had no effect. I
unplugged it
It is a FE-5680B. It is my understanding that these were made in many
variations
of features but that what features were present or absent could not be known
from the model numbers of other external identifying information. This one
has the 1 PPS apparently.
Pete.
On 11/4/2016 1:07 PM, EB4A
On 11/4/2016 5:24 PM, Poul-Henning Kamp wrote:
Yes, that sounds about right for an isotope with a 40 billion years
half-life.
The problem with the half life number is that the cylinder
still was marked "radioactive" complex with the radiation
symbol. Radioactivity (for legal purposes) is a
On 11/4/2016 4:04 PM, Poul-Henning Kamp wrote:
Historically resonance cavities were used so that step/avalance
diode multipliers had enough power to excite them. Today we have
semiconductors which work at those frequencies.
A great deal of complexity in the 5061 went into
exciting an SRD at
In message , David writes:
>Various online sources say that natural rubidium is radioactive enough
>to fog photographic film in 1 to 2 months but that is also the case
>with unprocessed uranium ore so I would not worry about it at all.
Yes, that sounds about right for an isotope with a 4
Hal-
I took your suggestion and sure enough, I can see on the scope that it puts
out a string on power up. I'm sure that's why SatStat gives me a
"Communications established- please wait" then "Checking echo". But then it
all seems to fall apart, because after that, it drops back to "Trying to
es
Hi David,
Your solution is fine. Most time interval counters can only make 10 or 100 or
at most 1000 measurements per second, so what you did is exactly the right
thing. When using a divider + TIC nothing is lost and everything is gained.
Even 'scopes cannot retrace 1000's of times a second. So
On Fri, 4 Nov 2016 18:43:03 -0400, you wrote:
>...
>
> There HAVE been attempts to deliberately jam cable distribution
>satellites... mostly the EIRPs used for distribution signal uplinks
>make this a bit difficult, but it has been done. There are also some
>countermeasures in place to hel
On Fri, 04 Nov 2016 14:39:54 -0700, you wrote:
>On Fri, Nov 4, 2016, at 02:27 PM, Poul-Henning Kamp wrote:
>>
>> In message <2af27ebe-9200-c348-c89b-b98f9c973...@karlquist.com>, "Richard
>> (Rick) Karlquist" w
>> rites:
>> >Also, one of the Rb isotopes is slightly radioactive.
>> >35 year
On Fri, 4 Nov 2016 18:23:16 -0400, you wrote:
>I no longer have DISH but I did have it a year ago and the outage
>happened every year like clockwork , they even sent me a notice that I
>could expect a sun outage and I did.. I also experienced outages every
>time a thunderhead at 30,+ feet g
The N resonance discussedd
in:http://walsworth.physics.harvard.edu/publications/2005_Smallwood_HUBAThesis.pdf
May be a better bet than traditional CPT.
Bruce
On Saturday, 5 November 2016 12:17 PM, Magnus Danielson
wrote:
Poul-Henning,
On 11/05/2016 12:04 AM, Poul-Henning Kamp wrote:
My simple solution to this was to divide the 1 PPS signal down so the
jitter from the uncorrected GPS was a smaller part. Of course then
each measurement takes proportionally longer.
On Fri, 4 Nov 2016 11:35:59 -0400, you wrote:
>I gave up on trying to use the GPS 1 PPS signal to calibrate the 1
On Fri, Nov 04, 2016 at 06:19:13PM -0400, David I. Emery wrote:
> Solar outages are not greatly worse on C band.
>
> It WAS true that EIRPs at C band were kept lower at one time (to
> protect the now mostly completely abandoned terrestrial C band microwave
> telephone network which sha
Poul-Henning,
On 11/05/2016 12:04 AM, Poul-Henning Kamp wrote:
In message <59dc074a-3a09-6315-29d4-6877c3bf7...@rubidium.dyndns.org>, Magnus
Danielson write
s:
With respect to precision machining, that space has changed a lot
over the last five years, with precision CNC machines, fac
I would put a scope on the TX line from the Z3801A and power cycle it. I'm
pretty sure it prints out the version string on power up.
Have you checked the power supplies? Or looked for old electrolytics?
--
These are my opinions. I hate spam.
__
Hej Bruce,
Ah yes, that's it. Sorry for the bad wording.
Cheers,
Magnus
On 11/04/2016 11:41 PM, Bruce Griffiths wrote:
Hej Magnus
A quarter waveplate doesn't depolarise, it can however convert a linearly
polarised beam to a circularly polarised one.If you really need to depolarise a
laser be
In message <59dc074a-3a09-6315-29d4-6877c3bf7...@rubidium.dyndns.org>, Magnus
Danielson write
s:
>> With respect to precision machining, that space has changed a lot
>> over the last five years, with precision CNC machines, factory
>> or home-built, dropping dramatically in price.
>
>You
On Fri, Nov 04, 2016 at 03:19:20PM -0700, Hal Murray wrote:
>
> petervince1...@gmail.com said:
> > Sorry Don, I beg to differ. The effects are often not noticeable in these
> > days of digital television, but the noise-floor can definitely be seen to
> > rise dramatically on a spectrum analyser.
On 11/4/2016 6:04 PM, Peter Vince wrote:
Sorry Don, I beg to differ. The effects are often not noticeable in these
days of digital television, but the noise-floor can definitely be seen to
rise dramatically on a spectrum analyser.
Regards (ex BBC TV, London)
On 4 November 2016 at 21:51,
Hej Magnus
A quarter waveplate doesn't depolarise, it can however convert a linearly
polarised beam to a circularly polarised one.If you really need to depolarise a
laser beam, scattering from a colloidal suspension of Titanium dioxide is very
effective.There are no macroscopic moving parts.Brow
On Fri, Nov 04, 2016 at 09:58:50PM +, Mark Sims wrote:
> I was a local electronics parts store this afternoon and they were
> saying some of the satellite TV internet infrastructure was being
> DDoS'd... ah, the subtle wonders of a few hundred thousand hacked TV
> cameras yammering down your
petervince1...@gmail.com said:
> Sorry Don, I beg to differ. The effects are often not noticeable in these
> days of digital television, but the noise-floor can definitely be seen to
> rise dramatically on a spectrum analyser.
Right. But I think that's because the sun is lining up with the sat
Hi,
On 11/04/2016 10:27 PM, Poul-Henning Kamp wrote:
In message <2af27ebe-9200-c348-c89b-b98f9c973...@karlquist.com>, "Richard (Rick)
Karlquist" w
rites:
Also, one of the Rb isotopes is slightly radioactive.
35 years ago, the guy in the next cubicle got away with
storing it under his
Peter...
The rise in the noise floor on Ku was not sufficient to cause
programming outage.
When I was running the satellite receive system in Miami,
we never had problems with Ku downlinks during the twice
yearly sun outage.
My customers in the news department got very upset when their
C-Ba
On Fri, Nov 04, 2016 at 06:11:48PM -0400, David I. Emery wrote:
>
> The solar outage season (a loss of signal for about 10 minutes
> max when the sun is directly behind the satellite as seen from the dish)
> runs from very late Sept (deep south) to about Oct 15 or so (Canada).
Try
On 11/4/2016 2:51 PM, Don Murray via time-nuts wrote:
DirecTV and DishNetwork are on Ku-Band platforms.
Ku-Band is not affected by sun outage.
Don
W4WJ
The backhaul on C band might be affected.
Rick
___
time-nuts mailing list -- time-nuts@febo.com
Hi all-
Dave K2DH here. I'm new to the group as of today. I have an old HP Z3801A
that I've had for years and which has been packed away for several years.
It worked when I put it away, but now, although it seems to come up
correctly, I have no serial comms with it.
I'm looking for a little hel
I should add to this- On power up of the receiver, the SatStat window does
say "Communications established- please wait." Then "Checking echo" Then it
goes into the repetitive "Trying to establish communications" and "No
response." every 3.5 seconds or so.
Dave
_
From: Dave Hallidy [m
On Fri, Nov 04, 2016 at 05:51:35PM -0400, Don Murray via time-nuts wrote:
> DirecTV and DishNetwork are on Ku-Band platforms.
> Ku-Band is not affected by sun outage.
I beg to differ !!!
The sun is still plenty energetic enough at 10-12 Ghz to
override weak satellite transmissions
On Fri, Nov 04, 2016 at 04:52:25PM -0400, paul swed wrote:
> U with respect to direct TV is it the noramal two time per year sun
> outage its about the right time.
> Regards
> Paul.
Nope way off...
The solar outage season (a loss of signal for about 10 minutes
max when the
On Fri, Nov 4, 2016, at 02:27 PM, Poul-Henning Kamp wrote:
>
> In message <2af27ebe-9200-c348-c89b-b98f9c973...@karlquist.com>, "Richard
> (Rick) Karlquist" w
> rites:
> >Also, one of the Rb isotopes is slightly radioactive.
> >35 years ago, the guy in the next cubicle got away with
> >s
On Friday, November 04, 2016 09:27:59 PM Poul-Henning Kamp wrote:
>
> In message <2af27ebe-9200-c348-c89b-b98f9c973...@karlquist.com>,
"Richard
> (Rick) Karlquist" w
> rites:
> >Also, one of the Rb isotopes is slightly radioactive.
> >35 years ago, the guy in the next cubicle got away wit
> it did when my Z3801A did a false leap-second at the end of September.
Was there a similar problem/opportunity at the end of Oct? Should we watch
at the end of Nov (last chance for a while)?
What did the Z3801A do? Was the bug in the Z3801A or in an ancient version
of ntpd without the fix
Sorry Don, I beg to differ. The effects are often not noticeable in these
days of digital television, but the noise-floor can definitely be seen to
rise dramatically on a spectrum analyser.
Regards (ex BBC TV, London)
On 4 November 2016 at 21:51, Don Murray via time-nuts
wrote:
> DirecT
I don't think so Paul. That happens about the 12th of October in London
(51.5° North), a few days later at higher latitudes, and a few days earlier
at lower latitudes. Cairo, for instance, on about 30° North, was around
the 5th of October.
Peter
On 4 November 2016 at 20:52, paul swed wro
I was a local electronics parts store this afternoon and they were saying some
of the satellite TV internet infrastructure was being DDoS'd... ah, the subtle
wonders of a few hundred thousand hacked TV cameras yammering down your pipe at
the same time.
__
DirecTV and DishNetwork are on Ku-Band platforms.
Ku-Band is not affected by sun outage.
Don
W4WJ
In a message dated 11/4/2016 3:52:33 P.M. Central Daylight Time,
paulsw...@gmail.com writes:
U with respect to direct TV is it the noramal two time per year sun
outage its about the righ
Yes, and it will also automatically do a screen dump to the file
"leap_sec.gif" That all assume that the GPS device reports a leap second as
23:59:60. Some devices duplicate 23:59:59 or 00:00:00 I have also seen one
say 00:00:60
The next version of Lady Heather internally handles time di
In message <2af27ebe-9200-c348-c89b-b98f9c973...@karlquist.com>, "Richard
(Rick) Karlquist" w
rites:
>Also, one of the Rb isotopes is slightly radioactive.
>35 years ago, the guy in the next cubicle got away with
>storing it under his desk. He also happily smoked
>cigarettes all day at
U with respect to direct TV is it the noramal two time per year sun
outage its about the right time.
Regards
Paul.
On Fri, Nov 4, 2016 at 4:47 PM, Norm n3ykf wrote:
> Tmobile clock on cell off. Garmin fenix3 watch is correct.
>
> On Fri, Nov 4, 2016 at 4:19 PM, Don Murray via time-nuts
> wr
Tmobile clock on cell off. Garmin fenix3 watch is correct.
On Fri, Nov 4, 2016 at 4:19 PM, Don Murray via time-nuts
wrote:
> No problems here with FOX on Dish, Ch 205
>
> Don
> W4WJ
>
>
>
> In a message dated 11/4/2016 1:45:21 P.M. Central Daylight Time,
> bill.i...@pobox.com writes:
>
> Satellit
On 11/4/2016 12:34 PM, Hal Murray wrote:
kb...@n1k.org said:
The only practical way to set the 10811 or 10544 is with a >= 10 turn pot on
the EFC. I never have worked out just why there are so many instruments that
don’t have a pot on the EFC.
How would temperature effect that? For that matt
No problems here with FOX on Dish, Ch 205
Don
W4WJ
In a message dated 11/4/2016 1:45:21 P.M. Central Daylight Time,
bill.i...@pobox.com writes:
Satellite TV (Dish, Direct, etc) has been having trouble for 10 hours or
so, sometimes losing some channels and occasionally all of them.
Fox
kb...@n1k.org said:
> The only practical way to set the 10811 or 10544 is with a >= 10 turn pot on
> the EFC. I never have worked out just why there are so many instruments that
> donât have a pot on the EFC.
How would temperature effect that? For that matter, how does temperature
effect the
On Nov 4, 2016 19:45, "Bill Hawkins" wrote:
>
> Satellite TV (Dish, Direct, etc) has been having trouble for 10 hours or
> so, sometimes losing some channels and occasionally all of them.
>
> Fox News is consistently down, so it could have a human cause, but Space
> Weather says we have unusual so
Satellite TV (Dish, Direct, etc) has been having trouble for 10 hours or
so, sometimes losing some channels and occasionally all of them.
Fox News is consistently down, so it could have a human cause, but Space
Weather says we have unusual solar activity.
I no longer have GPS time receivers, so I
I'm not sure if there is a reason counters don't let you digitally
calibrate beyond that, the 10 MHz ref out on the rear panel would still be
out of cal.
On Fri, Nov 4, 2016 at 1:48 PM, Bob Camp wrote:
> Hi
>
> The only practical way to set the 10811 or 10544 is with a >= 10 turn pot
> on the EF
Hi
The only practical way to set the 10811 or 10544 is with a >= 10 turn pot on
the EFC. I
never have worked out just why there are so many instruments that don’t have a
pot on
the EFC.
Bob
> On Nov 4, 2016, at 11:35 AM, Peter Reilley wrote:
>
> I gave up on trying to use the GPS 1 PPS signa
A bit OT, but regarding your Rb, some units needs to be powered thru 2
pins, one is used only for the 10 MHz output buffer, if remember it
correctly. Which is your model number?
Ignacio EB4APL
El 04/11/2016 a las 16:35, Peter Reilley escribió:
I gave up on trying to use the GPS 1 PPS signal t
I gave up on trying to use the GPS 1 PPS signal to calibrate the 10 MHz
OCXO's that
I have. The reason that others have pointed out is that the
uncorrected 1 PPS
signal from the GPS is has just a little too much a jitter to use it for
calibration
with your eye using a scope. If it were sawto
Hi
You are indeed effectively either doing a startup or contracting with somebody
already in the business. In a lot of ways, contracting this out might be the
easier
approach. The trick there will be having enough business to make it attractive
to them.
Bob
> On Nov 4, 2016, at 11:21 AM, Scot
You will also share the same challenges as Touchstone semi did, no one
wanted to stick their neck out to design in a little startup.
On Thu, Nov 3, 2016 at 7:49 PM, Bob Camp wrote:
> Hi
>
> Not many people have had exposure to Rb’s or Cs standards actually being
> built. That leaves a major gap
I have Version 2.01.0 - appears tp be a beta from 2013. I don’t know if it’s
the best though.
> Le 4 nov. 2016 à 02:56, Giuseppe Marullo a écrit :
>
> Mike,
>
> thank you.
>
> Found several versions on the net, which one is the "best" version to try?
>
> TIA.
>
> Giuseppe Marullo
>
> IW2J
On Thu, 3 Nov 2016 23:52:00 + (UTC)
Bruce Griffiths wrote:
> Attached graph indicates ADEV achieved with a 25mm double resonance Rb vapour
> cell
> Performance appears somewhat better than HP5065A (even Corby's souped up
> version).
> The thesis (by Thejesh N. Bandi) on this double resona
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