uses SCPI as well, I might be in business. Does
anyone know about that?
Rick N6RK
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n measuring ADEV. You'll never see
the word "tau" on the screen. In any event, gate times less
than 200 ms (even 199 ms) don't appear to work for ADEV.
Rick, N6RK
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unter that can
measure ADEV and Hadamard using off the shelf software
that runs on a PC? I don't write software :-)
Bonus question: software to make these measurements
that works with the FCA3103 that I already have?
I have an NI GPIB-USB-HS to interface the counter
to the PC running the
capacitance you are able to
design with. Digital controllers get around this as well
as having the capability of double integration for much
better transient response.
Rick
On 5/18/2018 11:03 AM, Gilles Clement wrote:
Hi,
I am trying to improve performance of an OCXO.
Could you point me at a good
I'm also interested if it can be arranged.
It would be great to be able to meet Attila in person.
Rick
On 5/18/2018 9:36 AM, Jerry Hancock wrote:
Are you going to be in San Francisco area? Maybe we could get a time-nuts
breakfast together with a couple of us.
Regards,
Jerry
On M
posed to work.
Surely, the authors are well aware of the 3 items above.
Also, why does the resonator have to be a whole kilogram anyway.
If it weighed exactly 10 grams, couldn't you still compare it
to a kilogram using 100:1 leverage?
Can anyone straighten me out?
Rick
_
substitution?
Articles about this topic are always presented as if the answers
are obvious.
Don't they base 0 degree Celsius on the triple point of water?
What's wrong with that?
Rick
On 4/22/2018 10:20 AM, Bob kb8tq wrote:
Hi
On Apr 22, 2018, at 12:19 PM, Poul-Henning Kamp wrote:
Sil
different, not even a phase detector at all.
Rick N6RK
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der.
Rick N6RK
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aler.
You can still get 11C44's of a sort by ordering NTE974's
that claim to be a replacement.
Rick N6RK
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en as necessary :-)
Rick N6RK
On 4/11/2018 9:26 AM, tn...@joshreply.com wrote:
That comes out to about 30ppb, and this is a pocket watch so they dont seem
to depend on the temp stabilization of being attached to a human wrist.
https://www.ablogtowatch.com/wp-content/uploads/2018/03/Citizen-Cal-
moved a few years ago, and their old bldg has been
torn down, along with the street and the entire neighborhood.
A hundred or so acres scraped.
Rick N6RK
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When I was working on fiber optic communication test,
I remember hearing about lasers that were "tuned" with
variable Peltier coolers. Power consumption is critical in
a cesium standard that can run on batteries. Maybe
the power consumption of the coolers is a deal breaker.
Rick
On
re never a low jitter way to square up a sine wave.
Rick N6RK
On 3/3/2018 10:34 AM, Mark Sims wrote:
Look at the LPRO manual. They have a couple of circuits that uses a single CMOS gate
with a capacitively coupled input. Wenzel has some very similar circuits on their web
site (search for
wave of voltage. This gives
an advantage of 4/pi in drive capability.
Rick N6RK
On 3/3/2018 4:09 AM, David C. Partridge wrote:
Using this to buffer output from an LPRO (74VHC1G14 (Schmitt trigger 3.3V
TTL compatible)), or an Efratom 105243-003 10MHz OCXO with CMS output
(74VHC1GU04 CMOS levels) in
rime time in a working standard
because the lasers drift over time. The 5071A's
claim to fame is that you turn it on and it just
works ... until it runs out of cesium. That is
another reason the 5071A isn't going away any time soon.
Rick Karlquist N6RK
Member: 5071A design team
On 3/3/2
. SRD's need tricky components
to make them "step" correctly. Again, poor grounding due
to corrosion could spoil the harmonic generation.
Rick Karlquist N6RK
Member of the 5071A design team
On 12/24/2017 3:54 AM, Kejia Lee wrote:
Dear All,
Happy Christmas!
May I know if anyone knows t
nd in time nuttery. The problem mentioned might
have been too subtle.
The 53132 has many good points but is not perfect.
Rick
On 12/18/2017 11:23 AM, Pete Lancashire wrote:
Friday I acquired a 53132A
https://photos.app.goo.gl/xexnJcEmT8tEWXi73
It does not have any options.
It is from a place
This looks like a very good starting point. It's a superset
that I can just simplify.
Rick
On 12/13/2017 12:10 PM, Adrian Godwin wrote:
Maybe this one ?
http://www.qsl.net/pa3ckr/bascom%20and%20avr/ad9951/index.html
There are probably many others
On Wed, Dec 13, 2017 at 8:03 PM, Ri
he schematic
of it to my own board? Is the Arduino software also
open source?
Rick
On 12/13/2017 12:47 PM, Clint Jay wrote:
I think maybe you might have meant the AD9835 ?
Anyway, there are plenty of code examples out there, do you have a
processor in mind or are you free to use whatever is s
might work for me.
I need to be able to embed this onto an existing PC board.
I can't use a preexisting "daughter" card, other than
to copy the design of the card.
Rick Karlquist
N6RK
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To uns
rs, rather than trying to pull them
with varactors.
Rick N6RK
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erous narrow band filters
that were problematical.
Rick N6RK
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a hardware engineer, even this simple software
stuff is above my pay grade. Any help would
be appreciated.
When I first got the 3048, I tried PN3048.
I realize it can effortlessly export graphs.
According to the author, it does not support
various features that
replacing
the stock varactor with a hyperabrupt type, probably my favorite
MV209, but I can't remember for sure.
Just yesterday, I designed a phase modulator using an MV209.
Rick Karlquist N6RK
RF designer on 5071A
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much are you asking and are you willing to sell individual items?
What software are you using? Do you have any line stretchers,
phase shifters, frequency dividers, signal sources or buffer amplifiers
etc to sell?
Rick
On 8/23/2017 5:07 PM, Eric Drucker wrote:
I am selling my HP 3048 phase
On 7/17/2017 1:41 PM, Attila Kinali wrote:
On Mon, 17 Jul 2017 12:07:29 -0700
"Richard (Rick) Karlquist" wrote:
On 7/17/2017 10:54 AM, Azelio Boriani wrote:
This implies that in a Rb or Cs there is not a voltage reference source?
Yes, that's right, there is no voltage r
On 7/17/2017 10:54 AM, Azelio Boriani wrote:
This implies that in a Rb or Cs there is not a voltage reference source?
Yes, that's right, there is no voltage reference with a material
effect on stability or accuracy.
Rick N6RK
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time
performance
by the reference used.
Has there been much improvement in references in the intervening
20 years?
Rick N6RK
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and
eason for using PP's.
If you never use batteries, then all the other
gendered connector schemes are fair game.
As far as connectors pulling out is concerned:
use a cable clamp to strain relieve the connection.
Rick N6RK
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other place that
repairs these things?
Rick N6RK
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in B mode (20 ppm/degree C).
Rick N6RK
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ronmental chamber runs. The E1983A software that
I "leaked" to the time-nuts community I believe has a
command that can be used to search for the turnover.
Rick N6RK
Attila Kinali
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their vacuum system.
There were certain temperatures known as "water
points" at which some water was released.
The retained water was in spite of the temperature
already being above 100 degrees C (boiling).
It has something to do with monolayers of
water molecules not boiling away.
he crystal
itself. The mounts are embedded in the ceramic header,
which is fairly conductive.
Rick N6RK
On 6/8/2017 1:19 PM, Bob kb8tq wrote:
Hi
If you look at the thermal conductivity vs very low pressures, the conductivity
comes up pretty quickly from a hard vacuum. There is essentially no i
the beginning.
The exact insulation is relatively unimportant.
We even tried still air using a knife edge
cradle. Didn't make much difference.
Rick N6RK
On 6/8/2017 1:27 PM, Attila Kinali wrote:
On Wed, 7 Jun 2017 14:21:52 -0700
"Richard (Rick) Karlquist" wrote:
The crystal
ver
be able to figure out. And, I still am astonished how well it works.
Attila Kinalid
Rick N6RK
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an
ode B. Otherwise, it was a great idea. It would still
be fine for an OCXO, where you just avoid activity dips.
However, the circuit design is very complicated.
Rick N6RK
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arely wiggled the crystal temperature/frequency.
Rick N6RK
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away from that temperature. Or it might change
sign at some ambient. (Yes, you can have negative thermal
gain). You shouldn't need to worry about this for any ordinary oven.
Rick N6RK
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ke to use the
same card/dongle for both the PN3048 and the HTBasic
programs. In the PN3048 program, there is
a menu pick to select NI card of type 1 or type 2.
Does anyone know anything about that?
Rick N6RK
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em to synthesize for direct multiplication if we had
wanted to do that. You seem to be doing it the hard way
(pre DDS) involving Diophantine equations. So it's easier
to do direct multiply than it used to be, but that doesn't
necessarily mean you should do it that way.
Rick
On 6/2/2017 10:
arily rejected it.
The architecture that is instead used is indeed
complex and expensive as you say. It is
also ACCURATE.
Rick
On 6/1/2017 7:04 PM, Donald E. Pauly wrote:
https://www.febo.com/pipermail/time-nuts/2017-May/105566.html
The lock system on the HP5071 is complex and expensive. My pl
tion was
also useless for their work. They had a huge room with 100's
of racks of equipment, but the 5061A and H maser had their
own dedicated room.
Rick Karlquist N6RK
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magnetics. IIRC, this allowed Len
Cutler to use a larger C field. Separating the lines farther is
more important in the 5071A because the other error sources are
reduced.
Rick Karlquist
On 5/25/2017 9:23 PM, Tom Van Baak wrote:
Donald,
You're familiar with the 9,192,631,770 Hz definiti
t doesn't draw much
power.
Rick N6RK
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o the wear out
of foam mattresses.
What should have been done with the thermal fuse would
have been to put crimp lugs on the leads and attach
the crimp lugs with screws. However, there was no space
for all that stuff.
Rick N6RK
On 5/10/2017 4:43 PM, Dan Rae wrote:
As I reported the last time this s
On 5/9/2017 12:05 AM, Poul-Henning Kamp wrote:
I'm sure that modern counters like 53230 are better at this than
The 53230 oven oscillator option in an inferior oscillator to
the 10811, by an order of magnitude. So in this case,
modern != better.
I know that it will run on Windows 2000. It was originally
written on Windows NT4.
Rick
On 4/24/2017 11:06 PM, gandal...@aol.com wrote:
Thanks Rick, I understand better now.
The turn over label is still on the crystal but not the matching label
on the PCB.
So far I've not been able t
sands.
The test software had the ability to sweep the oven temperature
and allow you to find the turn over. There was some way to
then set the oven to this temperature. I don't know if anyone
currently knows how to make the software do this anymore.
I knew at one time, but have long forgot
type connectors. I never had
any trouble making cables that connected to these units
using plain vanilla DB25's.
Rick N6RK
On 4/15/2017 10:42 AM, Larry McDavid wrote:
Ok, so a standard DB 25-pin socket-contact connector will mate with the
on-board connector with the center hole and missing pins. T
if the circuit recovered
correctly. It often didn't, and then it
was back to the drawing board...
Rick
On 4/12/2017 2:38 PM, Scott Stobbe wrote:
Hello,
I wanted to see if I could soft-start a used OCXO (Trimble 34310) during
warm-up. By default with an appropriately rated 12 VDC supply,
a noise source.
These days, noise comm has a much easier
solution off the shelf.
Rick N6RK
On 4/12/2017 1:23 PM, Bob kb8tq wrote:
Hi
*All* incandescent lamps emit RF ….. They are a resistive device that is heated
to well above
room temperature. People do use them in simple noise figure meters. The
offset from 6.834.
Rick N6RK
On 4/11/2017 2:59 PM, paul swed wrote:
When I read about the frequency generation in the Rb or CS there are
normally many numbers associated with the actual frequency. Down to at
least the 1 Hz level. Many of these PLLs are intended for multi-KHz steps.
I speculate
z might have had
something to do with it. That's a doable frequency in terms
of technology 60 years ago.
Rick N6RK
On 4/11/2017 1:54 PM, jimlux wrote:
On 4/11/17 12:34 PM, Attila Kinali wrote:
Hoi Jim,
On Tue, 11 Apr 2017 07:30:38 -0700
jimlux wrote:
I'm looking for a link to p
ve to keep the tip
off at the lowest temperature to keep the Rb in place and not
"flood" the cell and block the light. Etc., etc.
This is in the category of projects where if you were qualified
to do it, your time is far too valuable to do it for the amount
of money you wo
In the office where I work, they have 5 clocks on the wall
showing local time here at HQ and at 4 other company sites. It
is embarrassing that the clocks are always a few minutes
off from each other. I can see where these would make sense.
Rick N6RK
On 4/5/2017 4:30 AM, Bob kb8tq wrote:
HI
well known business model: "incremental" revenue
that doesn't "cannibalize" the cash cow. At least
this is/was popular with HP/Agilent/Keysight management
where I work(ed).
Rick N6RK
On 4/4/2017 8:00 PM, paul swed wrote:
Really can't say that its c-max or not. Since
the entire planet …..:)
Bob
This feature is mainly so you can set the time zone for GMT/UTC.
Hopefully, there is a way to turn off daylight savings time as well.
Many previous atomic clocks covered only the time zones near Boulder
and could not display UTC.
Rick N6RK
and it is actually cheaper then a weather balloon.
Yes Len Cutler did that 50 years ago, but the velocity of the plane also
has relativistic effects, so it's not a pure play.
Rick
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rable beyond sharing optical pumping.
Rick
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has done it.
Rick
On 3/17/2017 7:48 PM, cdel...@juno.com wrote:
Looks like Oscilloquartz is getting ready to sell this commercially!
Will give the 5071A a run for the money!
Reliability should go way up as:
-No electron multiplier
-No ionizer filament
-No state selection magnets
Also all the
reason IMHO to voltage tune an OXCO.
Rick
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ed the 10 meter dish that you used to see on
your right going south on 237 just before passing over
Central Expressway in Mountain View.
Rick N6RK
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. About all you can buy now are SAW oscillators.
Rick N6RK
On 3/13/2017 12:07 AM, Bryan _ wrote:
sorry, what do you mean by "complete oscillator" have outnumbered loose
crystals?
-=Bryan=-
From: time-nuts on behalf of Richard (Rick) Karlquist
Sent
I got a job in 1975 to design Konel's first synthesized radio, which
was to obsolete their crystal controlled radios. That's over 40 years
ago. The other trend (not mentioned) is that since 20 years ago or
so, complete oscillator sales have vastly outnumbered sales of loose
crystals.
y
got produced just to satisfy a few customers who
believed they wanted it.
Rick
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Agreed, for low phase noise FLOOR, it is imperative to
take the signal out through the crystal. However, for
close in noise (say ADEV at t=1), the Driscoll has
worked well for me. I have been able to reach ADEV
= 10^-11 at 100 MHz at using suitable resonators.
Rick
On 2/6/2017 4:35 AM, ka2
condition is that only
the second stage limits. First publications on
it were in the early 1970's (search Michael Driscoll).
Rick Karlquist N6RK
On 2/6/2017 1:06 AM, Yeti Yetos wrote:
Good morning,
What's the optimal oscillator topology for low phase noise (low frequency
noise and ph
perfect crystal has thermal stress as the temperature changes.
Rick
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files, except
substitute "run" for "exe")
Rick N6RK
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rends out
there as to what tool will attract a critical mass of users in
the future. There is strength in numbers.
Comments?
Rick N6RK
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which is the same as a
frequency offset.
Rick N6RK
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rd to get.
Rick N6RK
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A better and easier way is to phase lock a crystal oscillator.
I would use a 50 MHz VCXO and divide the output by 2 to get a
25 MHz square wave.
Rick N6RK
On 1/18/2017 10:28 AM, Loren Moline WA7SKT wrote:
Hello,
I am looking for a good X5 multiplier to use to generate a 25MHz signal from my
andard that was distributed around the plant.
This was called the "house standard". At Zeta Labs we had
an HP105 for the house standard.
Rick N6RK
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the Linear Technology LT3042 and
LT3045 with 2 (yes, TWO) NANOVOLTS/root-Hz spot noise. Orders of
magnitude better than the 78XX introduced 45 years ago.
Rick N6RK
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sent the time from the $GPRMC sentence to an LCD. I will ultimately use the
1PPS output from the receiver as well. I use the presence of the 1PPS signal
as an indication that the receiver is happy with life at that moment. It has
been chugging away for a few months now.
Cheers,
-rick, K7LOG
thing I can say is that it is good to keep the crystal
ovenized at all times. Even a momentary oven outage tends to
reboot aging.
Rick
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millidegree
and the frequency fluctuated maybe 5 parts in 10^-12 during
this event. IE, you don't need to worry about a fan blowing
on your OCXO, if it is any good.
Rick
On 11/20/2016 6:41 AM, Gary Neilson wrote:
I recently got a HP55300A on ebay for parts. It works fine but runs on 48V.
I am
onfirm" it.
Stay tuned.
Rick
On 11/18/2016 1:27 AM, David G. McGaw wrote:
There is something wrong with the example. The output is single-ended,
so using info from the AD9832 data sheet with Rset=3.9K and Rload=300
ohms as shown in the EVB schematic, it should go from 0 to 3.88mA and 0
to 1.
igned the task to them.
Rick
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with the counter expertise
has now been gone nearly 20 years. The counter line
has been offshored. The expertise over there is
a complete unknown.
Rick
On 11/19/2016 5:55 PM, Dr. David Kirkby wrote:
If anyone has the time & inclination, a document comparing different time
interval counters
A similar practice at a small East coast microwave company back in the 60s.
Except the product was magnetrons that were used in the Talos missile system
(if memory serves).
On Nov 18, 2016, at 01:30, David wrote:
I have only heard of and never observed the problem of manufacturers
cutting th
s to be only half of that.
Can anyone clarify this?
Rick
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, once the oven current
cuts back, the power supply voltage goes back up to over
15 volts so everything works. I fixed this problem in
the 5334B. I don't know if the 5335 has a similar problem.
Rick
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illator was a VCO that
covered an octave using around 100 varactor diodes.
It was called the "wagon wheel oscillator". Again,
it was a hero experiment. The total RF power was
enormous.
Just putting all this into perspective.
Rick
On 11/9/2016 4:20 PM, Jim Palfreyman wrote:
e is doing and he says he is searching for his
wallet that he lost. The bystander asks him where
he lost it and he says "on the next block".
The bystander asks him why search here and he
says this is the only place with light.
Rick
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ermore, we
don't have to filter out 9280 or 9367 because
they are ignored by the CBT. One of the reasons
for going up from 12 to 87 was to get these
spurs safely removed from anything that would
interact quantum mechanically with the cesium
line tail. With the increased accuracy, 12
was no long
On 11/5/2016 12:18 AM, Poul-Henning Kamp wrote:
In message <768ee5a7-1c53-06cf-cf36-ec75e2901...@karlquist.com>, "Richard (Rick)
Karlquist" w
rites:
Reminds me of an interesting Jack Kusters story.
There was some customer who was having problems with
his atomic cl
r.
It was pretty advanced for 1989.
Rick
On 11/4/2016 7:12 PM, paul swed wrote:
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
plaint, he wouldn't have to say anything
about radon to anyone. That was the last heard about the
helium problem.
Rick
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t
to knock yourself out trying to make an SRD multiplier
work. Also, these days, it is harder than ever to
purchase good SRD's.
Rick
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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
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tandard can be built in a garage using various
contract manufacturers available online. If I can give any advice
about this project, feel free to throw me some questions.
Rick Karlquist N6RK
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To
On 11/2/2016 10:23 AM, Tom Van Baak wrote:
Hi Rick,
You know the famous 1971 Hafele-Keating experiment with four 5061 cesium clocks
flying around the world. Several years later, a more precise measurement was
made by Carroll Alley using better clocks. What I read is that he got Len
o last 30 years!
Thus for those tubes, we can rule out cesium replenishment
even if it were possible.
Rick
On 11/1/2016 8:38 PM, Mark Sims wrote:
You mean I can't just drill a hole in, wash out the old cesium with some tap
water ;-), toss in some new cesium, suck out the air, bung a cork in
It can run 24x7 for 10 to 20
years and remain accurate to better than 1e-13. That's why everyone should own
a cesium standard after they grow tired of playing with GPSDO.
/tvb
___
Thanks for posting that Tom. You make me feel
like I'm
.
Rick
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One major one is that everything
in the tube is thoroughly "cesiated" as Jack put it.
Another is: how do you determine which parts to replace?
Another is: is this economically feasible?
Rick
N6RK
On 10/31/2016 2:50 PM, ed breya wrote:
It's a shame that they're not built in
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