I also have a 5680A with that strange little board. On a hunch, I
disconnected the orange wire and injected a DC voltage into the main
board. It caused the frequency to change. I don't know if it's the
C-field control or another mechanism, but the result is the same.
Ed
On 2/23/2014 4:01
I just picked up an Isotemp OCXO107-10 Oscillator. I thought it looked
like it might be interesting, but it turns out that it's better than I
thought. It's got a Dewar flask! I found the specs, but it didn't
mention anything about that. So, before I let the magic smoke out, does
anyone
531f7161.2080...@sasktel.net, Ed Palmer writes:
I just picked up an Isotemp OCXO107-10 Oscillator.
I can't remember which variant the on I have is. I'll check tomorrow.
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In message 531f7161.2080...@sasktel.net, Ed Palmer writes:
I just picked up an Isotemp OCXO107-10 Oscillator. I thought it looked
like it might be interesting, but it turns out that it's better than I
thought. It's got a Dewar flask! I found the specs, but it didn't
mention anything about that. So
Could be, but I didn't see a good picture of that oscillator. Here's the
one I bought:
http://www.ebay.com/itm/121264125456?orig_cvip=true
Ed
On 3/12/2014 1:43 PM, Arthur Dent wrote:
Sounds kind of like this oscillator. I found it to be very low
power but it took about a week for it to
It's hard to see in the picture, but my oscillator is labelled:
0410-2540
Model OCXO107-10
Freq 5.000 MHz
S/N6396-40
Notice the same '0410-2540' line. So you're probably right. I wouldn't
be surprised to find that Lucent had multiple sources for the oscillator
and their part
The specs that I found here:
http://web.archive.org/web/20010302193035/http://www.isotemp.com/ocxo107.htm
say the electrical EFC range is 0.1 PPM, but that's for the version
with the D/A converter. I can't find any hint about our version.
My unit is starting to settle down. Yesterday
FYI, I've posted a few pictures of the inside of this oscillator.
Noteworthy is the tiny Dewar flask.
http://s701.photobucket.com/user/edpalmer42/library/Isotemp%20OCXO107-10%20Oscillator
If you click on the magnifying glass at the bottom of the picture and
then do it again, you'll get the
What happens if you use Timelab to analyze the same data instead of Plotter?
I find that, depending on the dataset, one program or the other will
sometimes have trouble removing the steps completely. They leave small
steps behind. It isn't related to the counter used, but seems to be
I've seen similar results with my Racal-Dana 1992 counter. It has
trouble measuring time intervals when the inputs are almost in phase. I
think there has been discussion in the past about how various counters
handle that, but I can't find it right now.
Ed
On 5/1/2014 10:08 AM, Hans Holzach
I'm playing with my first Cs standard. It's a Datum 4065A which appears
to have a dead STEL-1173 synthesizer. Before I put too much effort into
replacing that, I thought I'd check the tube and see if it has any life
left. I've attached a chart showing the response of the central peak.
My
don't want to do that conversion!
In any case, I have many other toys to amuse me! :)
Thanks for all the tips!
Ed
Good luck.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Monday, May 05, 2014 12:46 AM
tube.
I'd recommend continuing with the repair.
Good luck.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Monday, May 05, 2014 12:46 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts
...@febo.com] On
Behalf Of Ed Palmer
Sent: Monday, May 05, 2014 12:46 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Datum 4065A Cs Tube Response
I'm playing with my first Cs standard. It's a Datum 4065A which appears to
have a dead STEL-1173 synthesizer. Before I put
Hi Magnus,
On 5/5/2014 3:30 PM, Magnus Danielson wrote:
Ed,
On 05/05/2014 10:56 PM, Ed Palmer wrote:
Hi Joe,
I didn't realize that the info in the 5061A manual was somewhat
'generic'. Thanks for the pointer.
On 5/5/2014 6:20 AM, J. L. Trantham wrote:
Ed,
If I have the math correct
I've been looking for some kind of converter but, so far, I've come up
empty. A converter to allow a PLCC44 to be used in place of a DIP is
easy to find, but a converter to allow a DIP to be used in place of a
PLCC44 is rare, at best.
It also occurred to me that signal fidelity (crosstalk,
Now that looks promising! The show-stopper problem with adapters like
Jason found is size. There's only about 20 mm between the circuit board
and the top of the case. I can imagine soldering this plug to a board
that had either the DIP chip or a ribbon cable to connect it to an FPGA
board.
It's starting to add up, isn't it? The only reason I'm considering it
is because I was able to confirm that the Cs tube is alive. If I can
get it working for a couple of hundred dollars and some time I think
it's a worthwhile project and as Bert Kehren mentioned, I'm not the only
one with a
I realize that this question has been asked before, but it's worth
asking again. Has anyone come up with any technical info on any of the
4065A or any of the other 4065 Cesium standards or the 5045A Cs Module
that it contains? I have checked the archives and searched extensively
through
a modulation scheme similar to the HP
5061A just because it would be interesting to implement my own system.
Ed
On 5/11/2014 3:30 PM, Magnus Danielson wrote:
Ed,
On 05/11/2014 08:26 PM, Ed Palmer wrote:
I realize that this question has been asked before, but it's worth
asking again. Has
Hi Corby,
Thanks very much for the offer, but it looks like it would still be a
big project to use an '1175 to replace an '1173. I think I'll have to pass.
The package difference (PLCC68 vs. PLCC44) would still require a
daughterboard of some sort. I've learned a little over the past week
/14/2014 06:53 PM, Ed Palmer wrote:
Hi Corby,
Thanks very much for the offer, but it looks like it would still be a
big project to use an '1175 to replace an '1173. I think I'll have to
pass.
The package difference (PLCC68 vs. PLCC44) would still require a
daughterboard of some sort. I've
There's a DIY project to build a spectrum analyzer at
http://scottyspectrumanalyzer.com . Since it's modular, one version of
the project is to add a couple of modules that change it into a network
analyzer.
If you search ebay for directional couplers, I can almost guarantee that
you will
Put it on one of the free filesharing sites and post the link. I've
used Mediafire.com for that in the past.
Ed
On 7/4/2014 3:30 PM, paul swed wrote:
Happy 4th of July on this Hurricane soaked day to any in the US.
I did send the document set out twice this week and I thought it might get
How much of an improvement does the LTC6957 give over, say, a simple
74AC gate?
Actually, is there a list of different techniques and the performance of
each? I know that the LPRO Integration manual gives some good info for
phase noise, but I'm not aware of a similar document for slew rate
You don't need an app.
1. Right click on the time display in the task bar.
2. Select 'Adjust Date/Time'.
3. Click on the 'Internet Time' tab.
4. Type in any server you want. I suggest 'us.pool.ntp.org'. This
gives you access to a pool of servers so that if one is down or wrong,
the next one
or something, if it doesn't work
anymore. However it's easy to change the NTP server, like Ed Palmer alrady described.--
I think all you need to do is double click on the clock icon
Chris Albertson
Redondo Beach, California
___
time-nuts mailing
I've seen a few pieces of equipment that use a transformer-coupled
output and an isolated BNC jack to break any ground loops. Then they
connect the shield to the chassis with a parallel RC network. The C
might be in the 1-10 nf range while the R is a few hundred ohms. I know
of one piece of
As I understand it, the only time that any sealed lead acid battery will
vent is in the case of gross overcharging. The battery is designed so
that normal charge rates and correct float voltage will result in
recombination of any hydrogen and oxygen produced. Was there a fault in
the
I talked about this earlier today, but my message disappeared along with
a second message. Neither made it to the list at all. So out of three
messages sent, so far only one made it to the list. Let's see if this
one makes it.
All UPSs have a problem when trying to figure out what float
How did you make the measurement that showed a 0.8 Hz difference? What
are the specs on your Racal reference? When was it calibrated and
against what standard? That will tell you how much confidence to put in
it's frequency.
As others have said, an FRK isn't a primary standard and should be
Is a heatpipe really appropriate for this application? The heatpipe
expects that the heat source wants to burn up and so there's lots of
heat available to vaporize the liquid in the pipe. It's not clear to me
whether that situation exists with these Rb standards. My tests with an
FE-5680A
Does anyone have a neo-7M and an HP 5371A or a 5372A Analyzer? Use the
Histogram Time Interval function to measure a block of samples. That
will show the length of the samples with a resolution of 200 ps. That's
what I did a couple of years ago when I analyzed the Navsync CW-12 with
the old
16:11, Ed Palmer wrote:
Does anyone have a neo-7M and an HP 5371A or a 5372A Analyzer? Use
the Histogram Time Interval function to measure a block of samples.
That will show the length of the samples with a resolution of 200
ps. That's what I did a couple of years ago when I analyzed
you pay for.
No, I'm not associated with Synergy or Jackson labs.
So Graham, if you survived the firestorm started by your simple
question, are you any wiser?
Ed
On 8/20/2014 7:56 PM, Tony wrote:
On 19/08/2014 16:11, Ed Palmer wrote:
Does anyone have a neo-7M and an HP 5371A or a 5372A
Paul,
How far from the equator are you? The farther you are, the more trouble
GPS has measuring your latitude due to worsening geometry.
By the way, does anyone know what the timing effects of that will be?
Is it documented anywhere? I noticed that the GLONASS satellites have a
higher
to -17 meters total range
Since you're closer to the equator your results should be somewhat
better than mine. You could use these numbers to help decide if you've
got a problem or not.
Ed
On 8/21/2014 3:57 PM, Paul wrote:
On Thu, Aug 21, 2014 at 4:03 PM, Ed Palmer ed_pal...@sasktel.net wrote
Have you checked your X72 to see if it has the 1 PPS discipline option?
That would be a lot easier (and probably better) than your proposed
transplant.
Ed
On 8/22/2014 12:39 PM, Dave M wrote:
Does anyone have any info on the OXCO in the Nortel/Trimble NTBW50AA-17
GPSTM receiver? The OXCO
Hi Charles,
I agree with your statement regarding the determination of the optimum
time constant, but, as Bob Camp mentioned, temperature change has a
significant impact on setting the value. My 'lab' is a
non-airconditioned bedroom. My Tbolt doesn't have any active
temperature control.
Now that I see it again, I think I knew about Miller's Shera version,
but I purged it from my brain in horror and disgust. He bought a
Z3801A, threw away the controller and added a Shera board. The Shera
board is good, but .
Ed
On 8/23/2014 1:40 PM, Charles Steinmetz wrote:
Ed wrote:
forum was a guy who
lives in a ground floor, north-facing condo. He might need to have a
disciplined Rb standard due to poor GPS visibility.
Ed
Thanks,
Dave M
Message: 5
Date: Fri, 22 Aug 2014 16:19:45 -0600
From: Ed Palmer ed_pal...@sasktel.net
To: Discussion of precise time and frequency
FYI, I found a source for the PLCC44 version of the STEL-1173 that's
used in some Datum FTS Cesium standards. I got mine from here:
http://www.aliexpress.com/item/Free-shipping-10PCS-STEL-1173-CM-PLCC/2023682701.html
I left positive feedback, not sure why it doesn't show.
Shipping was very
in time
interval mode?
On Fri, Nov 14, 2014 at 3:26 PM, Ed Palmer ed_pal...@sasktel.net wrote:
FYI, I found a source for the PLCC44 version of the STEL-1173 that's used in
some Datum FTS Cesium standards. I got mine from here:
http://www.aliexpress.com/item/Free-shipping-10PCS-STEL-1173-CM-PLCC
The HP / Symmetricom 58536A has a gain spec of 0 +-3 db so something is
clearly wrong. Did you power it through a spare port? Also, the
isolation spec is 26 db @ L1. The 50 db spec is for L1 +- 40 MHz.
I looked inside mine and found that there's an input filter(-1db), 21 db
amp, 4 way
K1602TE (note the different part number) oscillators have been sold on
ebay in the past. Keep an eye out there in case more appear. You could
also contact the people who sold them and see if they have one or two
more lurking in the corners.
Other than that, it's just a TCXO that uses the
Does anyone know what the story is regarding that site? There's a
wealth of hard-core Time-Nut information there, but after the first
level or two, all the links are dead. The main page (in Japanese) is at
http://etoysbox.jp. The English link takes you to
I've had a Z3801A for about a year. It's always had an issue where the
number of satellites tracked will drop to zero for one or two readings
and then jump right back where it was ( often at 5 or 6 satellites ).
This often (but not always) affects the EFC and/or PPS and/or HUP. My
Tbolt is
On Mon, Nov 5, 2012 at 10:38 PM, Ed Palmer ed_pal...@sasktel.net wrote:
I've had a Z3801A for about a year. It's always had an issue where the
number of satellites tracked will drop to zero for one or two readings and
then jump right back where it was ( often at 5 or 6 satellites ). This
often
On 11/5/2012 11:27 PM, Hal Murray wrote:
azelio.bori...@screen.it said:
Very interesting... is it using the binary protocol? Maybe a serial link
error, the binary protocol has a checksum (yes, NMEA too). Check the serial
link levels with a 'scope, maybe that the Z3801 firmware waits to see
detection in their firmware rather than in the receiver.
Bob
On Nov 5, 2012, at 10:11 PM, Ed Palmer ed_pal...@sasktel.net wrote:
Hi Azelio,
On 11/5/2012 4:09 PM, Azelio Boriani wrote:
Very interesting... is it using the binary protocol?
Yes, standard Motorola binary format.
Maybe a serial link
When I look at the data that the VP is sending to the Z3801A, all I see
are the Ba, Bb, and Bn commands. I don't know if any of those have
enough low level information to play with.
But if this is a firmware issue, shouldn't there be lots of Z3801As with
this problem? I suspect that there's
I understand that the 'B1' start to the model number means that it's
quite old.
I don't remember if I ever did a full reset so I just did one. We'll see
what happens.
Thanks,
Ed
On 11/6/2012 10:20 PM, Mike S wrote:
On 11/6/2012 2:59 PM, Ed Palmer wrote:
But if this is a firmware issue
I don't know about the '202' part, but here's a data sheet for the PRFS:
http://www.gigatest.net/datum/PRFSDS.pdf
The data sheet doesn't say which Rb oscillator is inside. Is it one of
the standard Datum models or a special one?
Ed
On 11/20/2012 12:47 AM, Edgardo Molina wrote:
Dear
I have a similar unit that I picked up a few years ago. It only has a 1
PPS output. That's the way it was designed. There are so many
different versions of this stupid model that it's impossible to be sure
what you're buying until you get it on your bench.
If yours is like mine, the DDS is
Did you see that Symmetricom has the MFTS (Modular Frequency Timing
System) which is described as the replacement for the MFS. The manual
includes a warning not to interchange the modules between the two
systems. There may be some value in reviewing the MFTS manual to see if
there's anything
Hi Chris,
The first thing you should do is join the EIP_Microwave group at yahoo:
http://tech.groups.yahoo.com/group/EIP_Microwave
There's lots of info and help there for EIP counters.
Don't worry about the signature analyzer for now. It would normally be
used if the processor was dead.
Hi Don,
Yes, I've heard of SRDs. I think every Rb standard uses them. I
recently purchased a YIG Multiplier that includes an SRD followed by a
YIG filter. But, from my reading, there are some significant issues
that you run into when driving an SRD. I'm still playing with mine.
Ed
On
On 12/2/2012 4:45 PM, Magnus Danielson wrote:
Erich, Edgardo,
On 12/02/2012 09:27 PM, Edgardo Molina wrote:
Dear Erich,
Welcome to this fine, friendly and knowledgeable group. You just
can't imagine how much I have grown in the field with the invaluable
support from every member here.
What are the horizontal and vertical settings for that picture?
Ed
On 12/18/2012 12:29 PM, cdel...@juno.com wrote:
I was recently repairing a noisy A3 module for an HP 5065A.
The phase modulator has 4 varactor diodes in parallel.
Since I suspected a diode, I removed them one at a time.
Of
I don't think that will work, Paul. The Z3801 is designed for the VT
receiver and uses commands that are not supported by the M12 or the
SSR. I believe there has been discussion on this in the past.
Now, maybe with a bit of arm twisting, whining and grovelling we could
get Synergy to write
Just set up your PVR to record it. You can watch it later.
Oh . uh . wait.
Ed
On 12/20/2012 11:16 AM, Burt I. Weiner wrote:
Excuse me for asking... Can anyone tell me what time the world is
supposed to come to an end tomorrow? We have a lot of shopping to do
and thought it would be
Since I have a Z3801A this is an interesting development. Do you expect
to see improved performance or is this simply to replace a dead VP
receiver and bring the Z3801A back to life?
My 6 channel VP receiver was flaky so I replaced it with an 8 channel
model. My Holdover Uncertainty
On 12/21/2012 11:12 AM, Bob Camp wrote:
Hi
The holdover uncertainty prediction is far more a function of your OCXO than of
the GPS.
Bob
On Dec 21, 2012, at 12:00 PM, Ed Palmer ed_pal...@sasktel.net wrote:
Since I have a Z3801A this is an interesting development. Do you expect to see
Hi Fabio,
A few years ago I got one of the programmable FE5680 units. It included
the same small, square board that I can see in your pictures. Only 3
wires: red, black, and orange. My unit didn't have any EFC control.
On a hunch, I checked the orange wire and found that it was the EFC
They are neat toys, aren't they? :-) I discovered them a couple of
years ago. Since then I've collected a few from ebay to play with.
They're oddball units with no documentation, but they weren't too hard
to decipher. I even cobbled together a phase-lock system for one. It
worked, but it
In the past there has been much discussion on this list regarding the
relative strengths and weaknesses of the 5370 (20ps resolution) and the
5371/5372 (150ps resolution) units. There are other units that have
even better resolution, but they tend to be pricey and/or more specialized.
Moving
A couple of years ago I bought an Intel Atom Dual Core board. It's
equipped with 2 com ports and 1 LPT port. A quick check at Newegg.com
shows that most, but not all, Atom boards (regardless of brand) still
include one or two COM ports and 1 LPT port. So, for somewhere around
$100 or less
Hi Joe,
I just did a quick search and found that the BP-1600 uses EPP (Enhanced
Parallel Port) protocol on the parallel port rather than using the port
like a GPIO port. Since this is a higher-level bidirectional protocol,
it should be easier to find a USB converter that will work. Look for
I use a Digi serial to ethernet terminal server for various serial
devices. You put the client software on your PC and the terminal server
ports show up as COM ports on the PC. This keeps the physical COM ports
free for any critical timing applications.
Drivers are available for Windows 98
I don't know if it would work on the Prologix adapter, but when you
install the drivers for the NI controller, they include a program called
'Measurement Automation Explorer' that includes the ability to scan
the bus, eavesdrop on the bus, send low-level commands and get
responses, etc.
Ed
Hi Garren,
I suggest that you get the Thunderbolt working first. Without a known
10 MHz source to compare to, you're flying blind. Once the Tbolt is
running, you should be able to check the frequency of the FRK by feeding
both into your scope. Trigger on the Tbolt and watch what the FRK
? Going to bed. Will check it tomorrow.
Garren
On Feb 8, 2013, at 8:25 PM, Ed Palmer ed_pal...@sasktel.net wrote:
Hi Garren,
I suggest that you get the Thunderbolt working first. Without a known 10 MHz
source to compare to, you're flying blind. Once the Tbolt is running, you
should be able
. Doesn't that mean I have about 4 to 5 volt
margin if it's locked at 12 volts?
I had to adjust the capacitor out almost all the way to get it to lock. If I
need to adjust it more can I use the C-field adjustment or should I stay away
from that?
Garren
On Feb 9, 2013, at 10:48 PM, Ed Palmer
I know that when making AC measurements on various OCXOs of the same
type, you have to expect wide variations in the results. e.g. TVB's
Allan Deviation measurements on a selection of 10811A oscillators at
http://www.leapsecond.com/pages/z3801a-osc . But what about DC current
measurements?
Deviation measurements, review
everything to see how, or if, oven 'noise' correlates to Allan Deviation
results.
Thanks Bob,
Ed
Bob
On Feb 18, 2013, at 2:40 PM, Ed Palmer ed_pal...@sasktel.net wrote:
I know that when making AC measurements on various OCXOs of the same type, you
have
oscillators draw a few milliamps ( up to 10 ) more than the quiet
one. That might allow them to warm up quicker.
Thanks,
Ed
Bob
On Feb 18, 2013, at 5:32 PM, Ed Palmer ed_pal...@sasktel.net wrote:
Hi Bob,
On 2/18/2013 2:42 PM, Bob Camp wrote:
Hi
Like any control loop, gain, bandwidth and noise
Hi Stu,
Did you find the long message threads from April May of last year
where I was trying to fix my 304-B? Look for Antique Rubidium
Standard, General Technology Corp model 304b and Antique Rb
Standard. Lots of good info from guys like Magnus Danielson, Paul
Swed, Ed Breya and others.
On 2/19/2013 12:54 PM, Magnus Danielson wrote:
On 19/02/13 19:36, Ed Palmer wrote:
Hi Stu,
Did you find the long message threads from April May of last year
where I was trying to fix my 304-B? Look for Antique Rubidium
Standard, General Technology Corp model 304b and Antique Rb
Standard
The recent thread on the 5370B resolution reminded me of a couple of
questions I have about my unit. Mine has a bit of a noise problem so I
thought I'd work through the operator verification tests and a couple of
the diagnosic flowcharts and see what popped up. The results turned out
to be
On 3/13/2013 5:19 PM, Mike S wrote:
On 3/13/2013 6:40 PM, lstosk...@cox.net wrote:
Some of the little magnetic attached antennas on eBay will operate on
3-5V. More problematic is using the older antennas which require 5V
with the newer chips such as the LEA-5,6,7 series which run on 3.3V.
I ran into the same problem a few years ago. I asked Symmetricom if the
unit could be upgraded. They said it could - for the low, low price of
only $1135.
No, I didn't forget a decimal point in there.
$1135.00.
One Thousand, One Hundred, and Thirty-Five Dollars!!
What planet are these
Hi Said,
That equation looks similar in form to the specs for any counter. What
are the comparable equations for the 53132A or the 5370(A or B)?
Ed
On 3/17/2013 10:41 AM, Said Jackson wrote:
Volker,
The error I have seen was in the high xE-011's to the low xE-010's. the only
way around
For some reason, I always had trouble with the XP time service so I
disabled it and added a different NTP demon. I never had another problem.
As I understand it, NTP never does DST changes. That's up to your OS to
handle. I live in an area that doesn't do DST changes so I've never had
to
When I was having trouble with my XP system, I could set the time off by
a few minutes and then ask it to do a time sync. It would report
success, but the time was still a few minutes off. At that point I
disabled the time service and installed an NTP program.
Ed
On 3/23/2013 8:30 PM, Rex
Yes, they're all online. Here's the link:
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/hpjindex.html
The best way to find a model # would be to use google's site: command
with the model # like this:
site:www.hpl.hp.com/hpjournal 83481a
Ed
On 3/29/2013 2:09 PM, Daniel Mendes wrote:
Em
There's something in the back of my mind that MuMetal is easily
magnetized. If that's true, and if the FRS-C and/or FE-5680 cases are
made of MuMetal (seems like a good chance), they should be demagnetized
anytime they come in contact with a magnet.
Ed
On 4/5/2013 6:22 PM, EB4APL wrote:
Hi Bert,
SV6 is the model number for an old Trimble 6 channel GPS board. Info is
available online. Maybe your receiver died.
Ed
On 4/6/2013 5:00 PM, Burt I. Weiner wrote:
I notice that when it first turns on there is a message where I
normally expect to see System Check ok. The message
Hi Skip,
You might have seen my reference to the small board in the 'variation 2'
FE-5680. I looked at the signal on the orange lead and found only about
2.02 Vdc. The orange lead goes to the output of a D-A converter on the
small board. So, on a hunch, I used a 10-turn pot to put 0-5V
Hi Mark,
I looked in the manual, but I can't see where it says that the command
is written to NVRAM. Where did you find that?
Ed
On 4/20/2013 11:53 AM, Mark C. Stephens wrote:
I have noticed Z38XX constantly sends:
:PTIME:TCODE FORM F2
Reading the documentation, this is a NVRAM command -
I think that Vref is derived from the internal voltage regulator that
powers the oscillator. Is it possible that any noise will appear on
both and therefore, they'll cancel each other out? That could even
reduce power supply sensitivity.
You could test that by measuring ADEV with an EFC pot
Another factor that limits the (apparent) interest is that the 5065B is
one of the most expensive and hardest to find Rb standards around. Even
on the used market the price for a 5065B in good condition can be
breathtaking. If Corby's work can be extended to other, more common
units, the
I recently made some measurements between 3 oscillators. It wasn't a
true 'Three-Cornered Hat' measurement because the measurements were made
sequentially. When I do the three-cornered hat calculation for the
hopefully 'better' oscillator, I end up trying to take the square root
of a
On 5/22/2013 4:58 AM, Mark C. Stephens wrote:
It's a 9390-55024
I have plugged my counter into the Efratom rubidium oscillator thing and
disconnected the EFC.
It is actually wobbling ~ +/-650Hz, peaking as much as +/- 1KHz.
So, hazarding a guess, something is very wrong inside the black box
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Ed Palmer
Sent: Thursday, 23 May 2013 1:16 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] 9390 GPS RX
On 5/22/2013 4:58 AM, Mark C. Stephens wrote:
It's a 9390-55024
I have plugged my counter
-boun...@febo.com] On Behalf
Of Ed Palmer
Sent: Friday, 24 May 2013 5:02 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] 9390 GPS RX
I applaud your enthusiasm, but Slow Down! Don't go randomly trying things.
The more you touch, the more you break! If you damage the Rb lamp, you
...@febo.com] On Behalf
Of Ed Palmer
Sent: Friday, 24 May 2013 4:03 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] 9390 GPS RX
Hold on mate! You're not quite done yet. :)
You said you tweaked the cap to get the Control Voltage to 8 volts and saw the
proper frequency. You should be able to move
with the family too!
-marks
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Ed Palmer
Sent: Sunday, 26 May 2013 7:54 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] 9390 GPS RX
On 5/25/2013 12:43 AM, Mark C. Stephens wrote:
Hey Ed
I don't have an LPFRS, but if I'm reading the manual correctly, the
fourth column of numbers on the 'M' command (4D, 4C on your screen
capture) is the VCXO control voltage. Shouldn't this be continuously
sweeping up and down until it finds lock? Does the output frequency
sweep up and down
Hi Gerd,
When it locks for a few seconds, make a note of the VCXO control
voltage. Watch it as closely as you can during the lock period. Is it
very near one end of the sweep range? Does it then drift off the end of
the range when lock is lost? That behaviour would suggest that the VCXO
ashle...@aol.com wrote:
Hello. We built the 10mhz simple GPSDO from boards supplied by G3RUH.
(Using the Jupiter GPS receiver)
Questions:
Has anyone built one,
How well does it work
I haven't built one, but people who have say its performance is
comparable to commercial units. Check out
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