Hi
If you make the cells in the basement (or even in most factories) the ability
to have a wide range
synthesizer will come in handy. The whole “6.834xxx GHz” thing is dependent on
a number of variables.
It is not at all uncommon to produce cells that come out 10’s or 100’s of KHz
off of the “
You always want two frequency sources. One generates a carrier
frequency offset many MHz from 6.834 GHz and the other frequency
source modulates the carrier with a sideband that is at the
exact ~6.834 GHz frequency that finds the atomic line. The
sideband is in turn modulated with audio to find
HI
> On Apr 11, 2017, at 5:57 PM, jimlux wrote:
>
> On 4/11/17 12:59 PM, Bob kb8tq wrote:
>> Hi
>>
>> Assuming you are doing a “conventional” Rb and Cs there are a number of
>> differences. There is the sub set of doing a gas cell based on Cs which is
>> a lot more similar to Rb. With the Cs,
HI
> On Apr 11, 2017, at 6:15 PM, Richard (Rick) Karlquist
> wrote:
>
> The "magic" of Rb in a gas cell standard is that you
> can make an optical filter cell out of radioactive
> Rb87 isotope that allows you to selectively optically pump
> to the quantum level you need. It is just "luck"
> th
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 you might need 2 PLLs one thats very fine in I hz increments
that gets a
On 4/11/17 12:59 PM, Bob kb8tq wrote:
Hi
Assuming you are doing a “conventional” Rb and Cs there are a number of
differences. There is the sub set of doing a gas cell based on Cs which is
a lot more similar to Rb. With the Cs, you are building a very complicated
vacuum tube that plays with a f
The "magic" of Rb in a gas cell standard is that you
can make an optical filter cell out of radioactive
Rb87 isotope that allows you to selectively optically pump
to the quantum level you need. It is just "luck"
that the absorption line falls where you need it.
And the RF pumping is at a doable 6
On 4/11/17 9:22 AM, Magnus Danielson and Rick Karlquist wrote:
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 would save.
This is the type of project you do not to save any money, but to spend
and le
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 point to an explanation (at a basic level) of
the difference between Rb and Cs references, and what the tradeoffs are.
I googled a bit, but all I got were some explana
Hoi Jim,
On Tue, 11 Apr 2017 07:30:38 -0700
jimlux wrote:
> I'm looking for a link to point to an explanation (at a basic level) of
> the difference between Rb and Cs references, and what the tradeoffs are.
> I googled a bit, but all I got were some explanations of the differences
> in things
Hi
Assuming you are doing a “conventional” Rb and Cs there are a number of
differences. There is the sub set of doing a gas cell based on Cs which is
a lot more similar to Rb. With the Cs, you are building a very complicated
vacuum tube that plays with a focused beam of ions traveling in space.
the are 6GHc synthesizer chips from ADI available see here
http://www.analog.com/en/analog-dialogue/articles/design-a-direct-6-ghz-local-oscillator.html
73
KJ6UHN
Alex
On 4/11/2017 8:29 AM, Attila Kinali wrote:
On Tue, 11 Apr 2017 07:31:01 +
Andre wrote:
Has anyone else either built
YES SDRs [step Recovery Diodes] is hard to find today, but there many--
PIN -- diodes, which exhibits that effect, even some standard rectifier
diodes could be used for, despite of that Magnus is right, today are
better solutions available e.g. PLLs with 10GHz prescalers
73
KJ6UHN
Alex
On
But, in the true time nuts tradition, I would expect it is time to trap an ion.
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y
les...@veenstras.com
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob kb8tq
Sent: Tuesday, April 11, 2017 12:50 PM
To: Discus
Hi
If you are going to do a Rb, probably the best place to start is with a
salvaged physics
package out of one of the telecom Rb’s. That would let you get the “easy bits”
worked
out on your side of the design. It would also let you lear how to address a
few of the
more complex items sorted as
On 04/11/2017 05:54 PM, Richard (Rick) Karlquist wrote:
On 4/11/2017 12:31 AM, Andre wrote:
Has anyone else either built an atomic clock around a bare Rb lamp
module "core" or attempted
Not a DIY project, but I was the RF designer on the HP 10816 rubidium
standard, which never made it to
I'm looking for a link to point to an explanation (at a basic level) of
the difference between Rb and Cs references, and what the tradeoffs are.
I googled a bit, but all I got were some explanations of the differences
in things like vapor pressure, etc.
Wikipedia (Atomic_clock) has some nice w
On Tue, 11 Apr 2017 07:31:01 +
Andre wrote:
> Has anyone else either built an atomic clock around a bare Rb lamp module
> "core" or attempted
>
> to make a hydrogen maser?
Building my own Rb vapor cell standard or H-maser is on my list
of Things-I-have-to-do-before-I-die :-)
If I had to d
On Mon, 10 Apr 2017 16:49:24 -0700
jimlux wrote:
> The M-code is described in a fair amount of detail here:
> www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA456656
Not really. All it says that it's a BOC(10,5) signal using some
code that allows direct aquisition. It doesn't even mention what
the rate of th
On 4/11/2017 12:31 AM, Andre wrote:
Has anyone else either built an atomic clock around a bare Rb lamp module
"core" or attempted
Not a DIY project, but I was the RF designer on the HP 10816 rubidium
standard, which never made it to product introduction (a half dozen
working pilot run unit
David wrote:
If the 10pA specification is guaranteed by design, then wouldn't they
have to be testing the 1pA "A" parts?
That assumes the parts are produced by exactly the same process, which
is very often not a safe assumption. One of them may undergo extra
process steps, for example, or o
> Most wristwatches do not have any temperature compensation. If worn, the
> wristwatch is pretty close at the 25°C (the human body is a quite good and
> temperature stable oven). The difference only starts to > show when the watch
> isn't worn for long periods of time.
That explains my experi
Andre
Now I know your location. So your questions make more sense to me.
With respect to home brewing atomic standards. There have been numerous
threads on time-nuts around this.
The fact is technology has obsoleted so many technologies that things like
Rb references can be had far cheaper used the
Hi
If you go back in the thread, it started out as a “general purpose front end”
design. One of the
suggested parameters on that design was a high impedance input capability in
the 1mega ohm range.
Noise on a hi-z input is always an issue and input protection just makes it
worse.
About the
David wrote:
I ended up qualifying 2N3904s based on manufacturer and lot and I
think we ended up using ones from Motorola. I wish detailed process
information like National had was available from every manufacturer.
It is, if you ask the process engineers for it. (From the Big Boys,
that is
David wrote:
I ended up qualifying 2N3904s based on manufacturer and lot and I
think we ended up using ones from Motorola. I wish detailed process
information like National had was available from every manufacturer.
It is, if you ask the process engineers for it. (From the Big Boys,
that is
I have a really naive question: how can picoamp leakage parts be relevant in
low impedance input pulse conditioning to an interval counter?
Tim N3QE
> On Apr 11, 2017, at 7:46 AM, Bob kb8tq wrote:
>
> Hi
>
>
>> On Apr 11, 2017, at 7:05 AM, Charles Steinmetz wrote:
>>
>> David wrote:
>>
>>
Hi
Testing can mean a lot of different things. Did they test every single part
they shipped for every parameter?
Did they just do a sample of parts and decide the lot was good? Did they test a
sample of parts for a sub-set
of the specs and decide they were good? Did they test them after packagin
Hi
> On Apr 11, 2017, at 7:05 AM, Charles Steinmetz wrote:
>
> David wrote:
>
>> I ended up qualifying 2N3904s based on manufacturer and lot and I
>> think we ended up using ones from Motorola. I wish detailed process
>> information like National had was available from every manufacturer.
>
Hi all.
As a first step, I wanted to build a specific hydrogen line (1.420 GHz) preamp.
Seems that some fluorescent tube starters do emit a very brief burst at around
1.4 GHz
during a specific portion of the initial switch-on surge when cold and actually
observed this here.
Also relevant, th
I read it took less than a week to discover how to unravel the GLONASS military
signals after they were turned on...
--
> This approach is known as “security through obscurity”, and is deprecated
> in the professional of information security. What one invents, another can
> dis
There are other ways that light can cause unexpected behavior.
In 1983 I worked on a process control system whose maiden installation
was in a corn processing plant, with lots of big valves and motors being
controlled. The cards that did A/D and D/A conversion of control signals
had UV erasable EP
32 matches
Mail list logo
