I have received permission to distribute copies
of my QEX article on this subject from ARRL. In
addition to the article I will include full size schematics
and color photos of the various assemblies. The
design includes an adjustable 10 MHz output amplifier for driving
50 OHM loads. If interested
Hi
So far, I have not found any of the Rb’s that came out of the KS boxes with
troubles. The ones I got and pulled from boxes myself all have worked fine. The
units that got pulled on the other side of an ocean, not so much. There have
been a couple of them with issues. What ever they go
Hi
As I recall, the whole LH series was a multi chip rather than monolithic IC
approach. Even back in the day, that made them expensive parts. There are other
parts that make fine 10 MHz buffers that only cost a dime.
Bob
On Nov 19, 2014, at 9:00 PM, Jim Lux jim...@earthlink.net wrote:
On
Hi
So the wrist watch sized fountain that was promised 15 years ago isn’t gong to
be here for Christmas this year?
Bob
On Nov 20, 2014, at 12:17 AM, Magnus Danielson mag...@rubidium.dyndns.org
wrote:
Hi Rick,
They did not mention the complexity of the laser system they needed,
On 11/19/14, 9:17 PM, Magnus Danielson wrote:
Hi Rick,
They did not mention the complexity of the laser system they needed,
especially considering that the optical bench of a fountain isn't all
that small, and also because they want to de-tune lasers. While they
seems to have an idea, they
On 11/20/14, 4:04 AM, Bob Camp wrote:
Hi
As I recall, the whole LH series was a multi chip rather than
monolithic IC approach. Even back in the day, that made them
expensive parts. There are other parts that make fine 10 MHz buffers
that only cost a dime.
Bob
Isn't that the significance of
The article says: What time is it? The answer, no matter what your initial
reference may be — a wristwatch, a smartphone, or an alarm clock — will always
trace back to the atomic clock.
The international standard for time is set by atomic clocks —
I always thought atomic clocks are maintained
Hi Bob,
Some time ago Hoptroff produced a Cs pocket watch using the Symmetricom
SA45s - now how long for a wrist watch !!
http://www.engadget.com/2013/05/01/hoptroff-no-10/
Peter
(still pendulum controlled)
On 20/11/2014 12:38, Bob Camp wrote:
Hi
So the wrist watch sized fountain that
On the old telco RBs $25 they all worked, but were down on lamp life. So
the first one chosen ran for 3 years and then started blinking out.
Replaced it with another. That first one is the one I used the heat gun on
and is again operable with what appears could be good lamp life.
(Reasonable)
Actually, I just looked at Hoptroff's website and guess what? Merry
Christmas!
http://www.hoptroff.com/collections/atomic-timepieces/products/no-16
Some time ago Hoptroff produced a Cs pocket watch
using the Symmetricom SA45s - now how long for a wrist watch !!
This is simply great. I now know what to look for at the MIT flea next
spring (If its around? Pure speculation on my part)
No more GPS, CS, or RBs for me and to heck with LORAN C and WWVB also.
Regards
Paul
WB8TSL
On Thu, Nov 20, 2014 at 8:37 AM, Peter Torry peter.to...@talktalk.net
wrote:
Hi
As suggested by Bob and others the REF1 new out of the box needs time to
burn in. At 1.8 weeks now I can see the EFC settling down towards a
straight line. To start I was about 800 counts per day rising. Today 150
and rising. So it is slowly shifting towards what a z3801 as an example
will do.
Yes, but that one's just a GPS watch (with a humongous price tag).
Regards,
David Partridge
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Jason Rabel
Sent: 20 November 2014 15:58
To: time-nuts@febo.com
Subject: Re: [time-nuts] MIT 2 inch cesium
I'll fire up my lab PC and take a more recent screenshot of my data - when I
last looked the EFC was a straight line and PPS TI / s had settled down but was
still noisy.
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of paul swed
Sent: Thursday,
Yea, there are tragical prices_btw, I fand some (a little bit better
priced) on ebay...
Greetings, Karl
2014-11-19 20:41 GMT+01:00 Brian Lloyd br...@lloyd.aero:
On Wednesday, November 19, 2014, Szeker K. szeke...@gmail.com wrote:
Hi Brian,
Tucker has it, but for $75,-
Hello everyone,
after what must have been the longest thread in T-nuts history its almost
all quiet today. I am going to take advantage of that and announce some
good news:
Its a miracle: the 10MHz DIP-14 TCXOs for the LTE-Lite came in weeks ahead
of schedule from the factory! And they
Simply a reflection of our lazy ebay response.
Regards
Paul
WB8TSL
On Thu, Nov 20, 2014 at 3:32 PM, S. Jackson via time-nuts
time-nuts@febo.com wrote:
Hello everyone,
after what must have been the longest thread in T-nuts history its almost
all quiet today. I am going to take advantage of
Said,
For a general purpose lab source, to feed things like
* 22 GHz spectrum analyzer
* 4.5 and 20 GHz signal generators
* 3 and 20 GHz VNAs
* 20 or 40 GHz frequency counter (I'm just looking to buy one)
what would you think is the best one to get - 10 or 20 MHz ? Or toss a coin?
Dave
Dr.
Hello Mike,
attached is a 10MHz DIP-14 TCXO Phase Noise plot from a random LTE-Lite
unit.
I had sent out a 20MHz typical phase noise plot some weeks ago, and
comparing the two they are almost perfectly 6dB apart as would be expected from
the 20log(n/m) relationship. There are variations
David
I picked up the 20 and its working well. But the 10 saves you the divide by
2. I know thats quite minor.
Several comments.
Said mentioned that it should be in a bix to prevent air currents.
Absolutely. Though my fix is a pair of heavy socks. It tends to behave like
the 3801 and KS-36... But
Hi Dave,
very good question, for up-conversion it almost always pays off to use the
highest frequency possible in my opinion. The reason is that you get a
noise increase of 20log(n/m) when up-converting.
So say you have two references, one at 10MHz and one at 100MHz. Say both
have a noise
Hi Said,
do you have any information about how that TimePod 5330A works any
principal description?
73
KJ6UHN
Alex
On 11/20/2014 2:08 PM, S. Jackson via time-nuts wrote:
Hello Mike,
attached is a 10MHz DIP-14 TCXO Phase Noise plot from a random LTE-Lite
unit.
I had sent out a 20MHz
they are affordable and good:
585C/588C Frequency Counters
CW, pulsed, and other time-varying microwave and millimeter-wave signals
can be automatically measured by the 585C and 588C frequency counters.
VCO measurements, chirped radar profiling, and frequency-agile system
analysis
HI
On Nov 20, 2014, at 7:45 AM, Jim Lux jim...@earthlink.net wrote:
On 11/20/14, 4:04 AM, Bob Camp wrote:
Hi
As I recall, the whole LH series was a multi chip rather than
monolithic IC approach. Even back in the day, that made them
expensive parts. There are other parts that make fine
HI
I saw that when it came out. It’s a CSAC based gizmo and thus a gas cell rather
than a beam tube / state selection device.
Bob
On Nov 20, 2014, at 8:37 AM, Peter Torry peter.to...@talktalk.net wrote:
Hi Bob,
Some time ago Hoptroff produced a Cs pocket watch using the Symmetricom
Hi
Probably a question for John Miles (who designed them and is a list member) or
Symmetricom (who now sells them for $10K to $15K).
Quick and dirty description - takes the two inputs and digitizes them against
an internal clock. The result is fed to a PC via USB. The data is
auto-correlation
Hi
Based on what I’ve seen on multiple boxes, I believe that the graph you have
been looking at for TI is messed up due to a software bug. Checking things with
a terminal program, the status screen corresponds pretty well to the data I’ve
measured.
Bob
On Nov 20, 2014, at 4:40 PM, paul
Hi
So far, I have yet to have one of the Rb’s die (of the ones that worked when
new to me). The magic “lamp voltage” on the Efratom versions clusters in two
groups. That seems to be related to some sort of production change rather than
better performance on the (slightly) newer parts.
Bob
Paul,
if you set the serial switch on the LTE-Lite over to the NMEA side then the
uBlox application will give you all sorts of bar graphs for signal
strengths, position, time, etc as it decodes all the NMEA messages.
Alex,
the TSC5125A user manual contains a description of the theory in
Hi Said,
do you have any information about how that TimePod 5330A works any
principal description?
73
KJ6UHN
Alex
Here's the manual:
http://www.miles.io/TimePod_5330A_user_manual.pdf
These days, it's manufactured and sold by Microsemi as the 3120A Phase Noise
Test Probe. Microsemi
Also, I think John's TimePod user manual probably has a description of it.
Otherwise I remember Sam Stein (who is behind the TSC units) had some PTTI
or similar presentations discussing the technology, but I don't know where
those could be downloaded.
I have a large (if debatably organized)
Hi
The only time I ever used them, it was inside the loop with an op-amp. That
probably reduced the impact of non-ideal behavior.
Getting back to the box that started all this. It’s got what looks like a
high(ish) power linear amp already on the board. It’s made up of discrete
parts. I have
Bob - what data are you capturing / measuring? I was thinking of just writing a
simple capture program from the unit and analyzing it in Excel. When you say
the status screen correspons to the data you've measured, what is it that you
are comparing?
Anthony
-Original Message-
From:
Hi
I’ve posted a couple of phase plots of a few of the KS-24361 compared to a
5071A and to each other via a TimePod. Since phase is essentially time, it’s a
good way to get an idea of what’s going on. Spot checks with a terminal program
and SCPI appeared to show reasonable agreement between
Hello Said and T-nuts,
About the 20 MHz LTE-Lite, do you have news for a new batch? (unfortunately, I
missed the first one...)
Bye,
Jean-Louis
- Mail original -
De: S. Jackson via time-nuts time-nuts@febo.com
À: time-nuts@febo.com
Envoyé: Jeudi 20 Novembre 2014 20:32:36
Objet:
Hi Jean-Louis,
we are trying to get around some high minimum-buy quantities for that
oscillator. Will let you know when we secure more of them, hopefully in the
next
month or so.
bye,
Said
In a message dated 11/20/2014 16:27:46 Pacific Standard Time,
jl.on...@free.fr writes:
Hello
Said
Thanks missed that.
Regards
Paul
On Thu, Nov 20, 2014 at 6:17 PM, S. Jackson via time-nuts
time-nuts@febo.com wrote:
Paul,
if you set the serial switch on the LTE-Lite over to the NMEA side then the
uBlox application will give you all sorts of bar graphs for signal
strengths,
Unless you have a way to know what they are doing. You won't know if they
are failing. The initial sign is that they wink-out and restart. You will
spot it as your gear going nuts for a bit and then magically locking up.
Also as an approx lamp V in the 2-3V range. Thats really a gross figure I
Hi
I normally keep a watch on the lamp voltage (or what ever it actually is). I
was once told by somebody who should know that you simply watch for it to drop.
When it starts going down a couple volts, that’s when you should start looking
for a backup. It may run for months after it starts to
I had not realized that EIP continued to live on in a different form.
Counters even kept the same name on the front panel.
http://www.phasematrix.net/phasematrix/company/about-us
On 11/20/2014 2:40 PM, Alex Pummer wrote:
they are affordable and good:
585C/588C Frequency Counters
I do agree its subjective. But my gut says bad is 2-3V I know they seem to
run above 3. But whatever. When the blinkOmeter counts I am screwed. :-)
Time to get the heatgun.
Regards
Paul.
On Thu, Nov 20, 2014 at 9:07 PM, Bob Camp kb...@n1k.org wrote:
Hi
I normally keep a watch on the lamp
but there was a description; how to rejuvenate the rubidium bulb by
cautiously warning it up, to remelt the rubidium
73
Alex
On 11/20/2014 7:31 PM, paul swed wrote:
I do agree its subjective. But my gut says bad is 2-3V I know they seem to
run above 3. But whatever. When the blinkOmeter
Are there any atomic clocks that do not properly decode the current
WWVB format.
I have two that will not auto update the time and will troubleshoot
if this is not a format issue.
Thanks for any help.
73
Glenn
WB4UIV
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