Hi guys,
that's right, leave the old GPS in there so the firmware won't complain.
Just cut the 1PPS signal between the GPS and main-board, and feed-in an
external 1PPS with higher stability, the Z3801A will never know the difference.
Should work well.
bye,
Said
In a message dated
Just realized that if the Z3801A uses Sawtooth correction from the Oncore,
then it may slightly degrade the 1PPS from the M12+ unless there is a way
to disable sawtooth correction.
Nonetheless, I think the overall performance would improve significantly,
even if the M12+ sawtooth
Hi guys,
I wonder if anyone has ever replaced the 1PPS output of the oncore with an
external 1PPS from say an M12M receiver.
I would suspect all else being the same that the Z3801A would work much
better, and not have the problems Mike is seeing?
bye,
Said
In a message dated
Does anyone have a schematic for the Z3801A internal voltage converter board?
I will attempt to reverse engineer it if one is not available.
73
Glenn
WB4UIV
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Does anyone know where I might get the 24V version of the DC-DC
circuit board for a Z3801A? I'd like to change out the board in my 48V
unit, so both can be operated from the same supply to simplify things.
If anyone has a working DC-DC board from a dead Z3801A, please let me
know how much you
@febo.com
Subject: Re: [time-nuts] Z3801A PSU and Outer Oven Control
In a message dated 28/06/2009 19:54:05 GMT Daylight Time,
r...@sonic.net
writes:
No need to upload. You should have looked first. Both
information repositories are already there.
http://www.ko4bb.com/cgi-bin
Bingo :)
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com
Sent: Sunday, June 28, 2009 2:47 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3801A PSU and Outer Oven Control
In a message dated 28/06/2009
In a message dated 28/06/2009 03:14:54 GMT Daylight Time,
charlie.my...@ps.net writes:
The URL where all that information is posted is still on-line. The URL is
http://www.realhamradio.com/GPS_Frequency_Standard.htm
Enjoy the wealth of knowledge that is out there on K8CU's web site.
Hi All
Following my earlier post re the Z3801A PSU schematic I've realised that
the information I've emailed to several list members is not complete.
As well as the internal PSU description and schematic the original web site
also hosted a description and schematic for the outer oven
gandal...@aol.com wrote:
Hi All
I've had some problems uploading to Didier's site from the flaky broadband
connection here but If Didier, or anybody else for that matter, would like
to upload it there that's fine with me.
regards
Nigel
GM8PZR
No need to upload. You should have
In a message dated 28/06/2009 19:54:05 GMT Daylight Time, r...@sonic.net
writes:
No need to upload. You should have looked first. Both information
repositories are already there.
http://www.ko4bb.com/cgi-bin/manuals.pl?dir=05)_GPS_Timing/Z3801
I thought this is the kind of thing Didier
Hi,
Has anyone measured the outer oven temp of the double oven HP oscillator
in the Z3801A?
Thanks,
Corby Dawson
Criminal Lawyers - Click here.
Looking for a schematic of the Z3801? I'm primarily interested in the power
supply section. Anyone know an on-line source? I've been looking with no
success. Tnx!
Paul, W9AC
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Nigel,
Yes, please attach and send to my ARRL address. Tnx!
Paul, W9AC
- Original Message -
From: gandal...@aol.com
To: time-nuts@febo.com
Sent: Saturday, June 27, 2009 10:53 AM
Subject: Re: [time-nuts] Z3801A Schematic
In a message dated 27/06/2009 14:16:27 GMT Daylight Time, w
In a message dated 27/06/2009 14:16:27 GMT Daylight Time, w...@arrl.net
writes:
Looking for a schematic of the Z3801? I'm primarily interested in the
power
supply section. Anyone know an on-line source? I've been looking with no
success. Tnx!
Hi Paul
There don't
...@aol.com]
Sent: Saturday, June 27, 2009 10:54 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3801A Schematic
In a message dated 27/06/2009 14:16:27 GMT Daylight Time, w...@arrl.net
writes:
Looking for a schematic of the Z3801? I'm primarily interested in the power
supply section. Anyone know
That would be neat to get a copy. I've saved a screen shot of a
Thunderbolt at 23:59:60.
Thought I'd show it at the 1/10 NEWS meeting.
Got our new FM antenna installed for WVTQ-FM on Equinox.
http://vprblog.blogspot.com/2008/12/intrepid-engineering.html
Mike
On Thu Dec 31
Sorry, meant to send this directly to Brian.
Mike
On Thu Jan 1 8:07 , sent:
That would be neat to get a copy. I've saved a screen shot of a
Thunderbolt at 23:59:60.
Thought I'd show it at the 1/10 NEWS meeting.
Got our new FM antenna installed for WVTQ-FM on
FWIW...
I have one of my Z3801A running with an external LED display
that's based on one of the Dave Robinson, G4FRE PIC controllers.
His design reads the raw binary output from the internal GPS RX.
A mini-disc cam-corder was aimed at the display and caught
the leapsecond.
ie:
23:59:58
23:59:59
Hi all,
I am reviving an old Z3801A that was stored for 5 years. I did the RS232
header mod and I can communicate with the unit. The power LED does not come
on, but I can control the enabled and active LED. I am not able to enter a
date after 2007 to speed up the adquisition process. Is there
Will I have a problem connecting the thunderbolt to the smartsplitter
using LRM400 50 ohm cable?
Try whatever cable you have handy. It's not likely to break anything.
I'm assuming you have some way to monitor your Thunderbolt and see if it's
working well enough.
--
These are my
From: Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] Z3801A ThunderBolt USING SAME ANTENNA?
Date: Wed, 09 Jul 2008 13:54:39 +1200
Message-ID: [EMAIL PROTECTED]
Bruce,
The 50 ohm BNC connector is rated up to 4GHz, the 75 ohm version to 2GHz.
Modern 75 Ohm BNC and cable is rated
Hi,
I am trying to set up a Z3801A and a ThunderBolt to operate off of one
symmetricom 58532A antenna using a symmetricom 4-port smartsplitter. The
Z3801A manual suggest using LMR 400 cable which is a 50 ohm cable which is
compatible with the antenna. The thunderbolt which I receive has a
Hi,
I am trying to set up a Z3801A and a ThunderBolt to operate off of one
symmetricom 58532A antenna using a symmetricom 4-port smartsplitter. The
Z3801A manual suggest using LMR 400 cable which is a 50 ohm cable which is
compatible with the antenna. The thunderbolt which I receive has a
measurement
Subject: [time-nuts] Z3801A ThunderBolt USING SAME ANTENNA?
Hi,
I am trying to set up a Z3801A and a ThunderBolt to operate
off of one symmetricom 58532A antenna using a symmetricom
4-port smartsplitter. The Z3801A manual suggest using LMR
400 cable which is a 50 ohm cable
jshank wrote:
Bruce,
Do I need to spend the extra $ for LMR400 cable or could I just use
rg58 for a total run of 60 feet.
Jeff
Jeff
A conservative approach would be to use a cable that has an attenuation
of no more than 10dB (the attenuation of the cable supplied in the
Trimble
Where can I download info on the Motorola Oncore VP OS Receiver used inh
the Z3801A ?
I was thinking about trying to get the NMEA data out and use VisualGPS.
Also, what Dumb Terminal Emulator program people use ? I have an old
Compaq Pentium with WIN98SE that I use for Radio Programming as well.
If somebody needs the User Manual of the Z3801A, it can be downloaded from here
:
http://www.weaksignals.com/bin/Z3801A_UserManual.pdf
73 Alberto I2PHD
P.S. It will stay there a few days only, so if you need it, get it now.
___
time-nuts mailing
Hi,
does anybody has actual data on this? Must have overlooked it somehow.
There seems to be a large discrepancy between unit specs and the OCXO
it uses.
Just looking for some more accurate input for simulations.
Thanks,
Christophe
begin:vcard
fn:Christophe Huygens
n:Huygens;Christophe
Christophe Huygens wrote:
Hi,
does anybody has actual data on this? Must have overlooked it somehow.
There seems to be a large discrepancy between unit specs and the OCXO
it uses.
Just looking for some more accurate input for simulations.
Thanks,
Christophe
I did finally find happiness at
First of all, many thanks to those who gave help, hints, ideas, and schematics
(!) over the past eight months; all was appreciated!
The story: I was building a master power/timing module for my rack system,
including a Z3801A in a snazzy pull-out configuration with a dist. amp. All
was great
Look at
http://homepage.sunrise.ch/mysunrise/shegnauer/Z3801A/Power%20Supply/z3801a_power_supply.htm
Juerg
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Are any schematics available, especially for the power supply board?
-Dave
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and follow the instructions there.
John Ackermann N8UR wrote:
OK, I've finished a comparison of two Z3801As running in normal locked
mode, and with one unit in holdover:
http://www.febo.com/pages/oscillators/z3801a/index.html
John
John
Typo at end of second sentence 2nd paragraph on web page: swpecifications
Bruce
Bruce Griffiths said the following on 01/30/2008 08:46 PM:
John Ackermann N8UR wrote:
OK, I've finished a comparison of two Z3801As running in normal locked
mode, and with one unit in holdover:
http://www.febo.com/pages/oscillators/z3801a/index.html
John
John
Typo at end of second
When the 3801A was designed, HP used a 300 or 400 second time constant
for a SA filter. Its in one of the early app notes for HP GPSDOs.
Tom Van Baak wrote:
Here I put the two runs in color on the same plot:
http://www.leapsecond.com/museum/z3801a/z3801a-free-lock.gif
That's an
, January 25, 2008 9:06 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3801A performance plots
Sorry, I mistyped. Try this:
http://www.febo.com/pages/oscillators/z3801a/
John
Mike Feher said the following on 01/25/2008 08:41 AM:
John -
Your link did
Here I put the two runs in color on the same plot:
http://www.leapsecond.com/museum/z3801a/z3801a-free-lock.gif
That's an interesting graph.
I find it strange that the free-running system is better than the locked
system in the range from 50 to 5000 seconds.
Hi Hal,
All GPSDO, by
.
-- john, KE5FX
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Hal Murray
Sent: Friday, January 25, 2008 3:34 PM
To: Tom Van Baak; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3801A performance plots
Here I put
Very nice. Thanks! (I'll report when I have my holdover experiment
finished in a few days.)
John
Tom Van Baak said the following on 01/25/2008 05:34 PM:
Tom's plots at http://www.leapsecond.com/pages/z3801a-osc/ show 13
Z3801As running in unlocked mode, measured against one of his most
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3801A performance plots
Mike, you did inspire me to do the follow-on experiment. I'm now
measuring the two units again, but this time with the antenna on unit 2
(the not-as-good one) disconnected just at the start
of precise time and frequency measurement
Subject: [time-nuts] Z3801A performance plots
I realized that there hasn't been data posted about how the Z3801A
performs when operating normally in GPS lock mode -- TVB's excellent
page focuses on the oscillators when they are free running.
So, I just did
That looks like a classical underdamped PLL response. You usually see this
sort of hump in a phase-noise plot when your PLL is about to break into
oscillation. :)
Either someone at HP was careless with the loop-filter constants and came
close to running out of phase margin, the Z3801A is
Here I put the two runs in color on the same plot:
http://www.leapsecond.com/museum/z3801a/z3801a-free-lock.gif
That's an interesting graph.
I find it strange that the free-running system is better than the locked
system in the range from 50 to 5000 seconds.
Does that mean the filter needs a
I realized that there hasn't been data posted about how the Z3801A
performs when operating normally in GPS lock mode -- TVB's excellent
page focuses on the oscillators when they are free running.
So, I just did an experiment measuring two well aged Z3801As in GPS lock
against one another. No
John Ackermann N8UR wrote:
I realized that there hasn't been data posted about how the Z3801A
performs when operating normally in GPS lock mode -- TVB's excellent
page focuses on the oscillators when they are free running.
So, I just did an experiment measuring two well aged Z3801As in GPS
Sorry, I mistyped. Try this:
http://www.febo.com/pages/oscillators/z3801a/
John
Mike Feher said the following on 01/25/2008 08:41 AM:
John -
Your link did not work for me. Thanks - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of John Ackermann N8UR
Sent: Friday, January 25, 2008 9:06 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3801A performance plots
Sorry, I mistyped. Try
Mike, you did inspire me to do the follow-on experiment. I'm now
measuring the two units again, but this time with the antenna on unit 2
(the not-as-good one) disconnected just at the start of the run. It'll
take about 4 days to gather the same data as the other plots, so be
patient. :-)
John
Tom's plots at http://www.leapsecond.com/pages/z3801a-osc/ show 13
Z3801As running in unlocked mode, measured against one of his most
excellent references. So I think that plot shows what you're looking
for. I was just trying to show what you get when you are running in the
normal locked
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
In a message dated 07/09/2007 16:21:14 GMT Daylight Time, [EMAIL PROTECTED]
writes:
I have a Vectron 10 MHz ovened oscillator, model CO-206B59VW, with output
via SMA and 7 solder pins for power and control lines.
It's
polluted environments (ie cell sites)and do not
suffer this problem. Since changing to one of these cone antennas the
problem has never reoccurred
Dave
ww2r
Message: 1
Date: Sun, 3 Jun 2007 13:49:56 -0400
From: michael taylor [EMAIL PROTECTED]
Subject: Re: [time-nuts] Z3801A Antenna
To: Discussion
I've seen a bunch of those trimble antennas on eBay, usually they sell them
in lots with other stuff. The lots haven't been selling, maybe you could
contact them and see if they would just sell you an antenna or two. I
*think* they are the usual 26dB gain. The HP/Symmetricom are 38dB (for
really
On 6/2/07, Bill Janssen [EMAIL PROTECTED] wrote:
I know this has been discussed recently but am wondering what the
recommended (cheap but usable )
antenna would be. I want to give him a recommendation or two. The
antenna has to be a 5 Volt version
to match the Z3801A
I actually have been
In a message dated 6/3/2007 10:51:33 Pacific Daylight Time, [EMAIL PROTECTED]
writes:
I ended up purchasing a Oncore 2000 antenna (5V, 25dB) from Ridge
Equipment http://www.ridgeequipment.com/store/page6.html that I need
to install still (when there is no risk of thunderstorms).
Hi
, 2007 2:18 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3801A Antenna
In a message dated 6/3/2007 10:51:33 Pacific Daylight Time,
[EMAIL PROTECTED]
writes:
I ended up purchasing a Oncore 2000 antenna (5V, 25dB) from Ridge
Equipment http://www.ridgeequipment.com/store/page6.html that I
[EMAIL PROTECTED] wrote:
In a message dated 6/3/2007 10:51:33 Pacific Daylight Time, [EMAIL
PROTECTED]
writes:
I ended up purchasing a Oncore 2000 antenna (5V, 25dB) from Ridge
Equipment http://www.ridgeequipment.com/store/page6.html that I need
to install still (when there is no risk
A friend of mine just picked up a Z3801 GPS receiver without the
necessary antenna.
I know this has been discussed recently but am wondering what the
recommended (cheap but usable )
antenna would be. I want to give him a recommendation or two. The
antenna has to be a 5 Volt version
to match
Good day,
*** REPLY SEPARATOR ***
On 02-Jun-07 at 16:39 Bill Janssen wrote:
A friend of mine just picked up a Z3801 GPS receiver without the
necessary antenna.
I know this has been discussed recently but am wondering what the
recommended (cheap but usable )
antenna would be.
I'm using it and it works.
I guess 58532A would be better for long run of cable though.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=320121796349
http://wildcard.pctel.com/images_product_overview/pdf_docs/GPS_TMG_26dB_specsheet.pdf
On 6/3/07, Bill Janssen [EMAIL PROTECTED] wrote:
A friend
Here are a few questions about reusing a Z3801A main board.
Would the Z3801A work with another GPS receiver?
In other words, does the board talk to the GPS engine via the serial
port, other than receiving the 1 PPS?
If it does talk to the GPS receiver, which GPS receiver other than the
. This would be a cute microcontroller
project.
/tvb
- Original Message -
From: Didier Juges [EMAIL PROTECTED]
To: !Time Nuts time-nuts@febo.com
Sent: Friday, May 18, 2007 11:51 AM
Subject: [time-nuts] Z3801A with other GPS receiver
Here are a few questions about reusing a Z3801A main
Oncore VP. This would be a cute microcontroller
project.
/tvb
- Original Message -
From: Didier Juges [EMAIL PROTECTED]
To: !Time Nuts time-nuts@febo.com
Sent: Friday, May 18, 2007 11:51 AM
Subject: [time-nuts] Z3801A with other GPS receiver
Here are a few questions about
I thought you had to use a VP in 6 channel mode for it to work on the
Z3801A?
Jason
If it uses the Motorola propietary commands, a M12 should be quite
compatible. I think a have somewhere some older documentation about the
@@ commands used in the 8-channel GPSs, but I think that they are
Jason Rabel wrote:
I thought you had to use a VP in 6 channel mode for it to work on the
Z3801A?
Jason
If it uses the Motorola propietary commands, a M12 should be quite
compatible. I think a have somewhere some older documentation about the
@@ commands used in the 8-channel GPSs,
Hi Didier:
I seem to remember that one or more of the HP boxes that used the 6/8 channel
Motorola GPS receivers used a secret method of making use of the sawtooth error
information. Some trick was needed because there was a bug that caused the
sawtooth to be wrong every now and then and it
For the price people are paying on eBay, it seems almost easier to sell a
Z3801 and but a Fury... lol.
But then that would defeat the whole challenge of a DIY project. ;)
Back on topic - From what I remember reading, I thought the sawtooth bug was
in earlier firmware versions. What about the
Didier Juges wrote:
That would be fine if I were dealing with a Z3801, but at the moment, I
am looking at that Z3801 main board someone has been trying to sell on
eBay for the best part of a year and I was wondering if something could
be done with it. It has no GPS and no OCXO.
I have a
Didier
Didier Juges wrote:
Bruce,
Not knowing exactly what that entails, in spite of the volume of useful
information you and others have dispensed on this list on that subject,
but always the hopeful engineer that I am :-), I wholeheartedly agree
with you.
Another approach I am
Jason,
Yes I have the users guide plus all the information I have found on
the Web. No where, that I have been able to find, is there any
information on the internal status LED's.
Had, K7MLR
At 11:04 AM 3/17/2007, you wrote:
Do you have the Z3801A GPS Receiver User's Guide PDF? If not you
-
From: Had [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sunday, March 18, 2007 8:51 AM
Subject: Re: [time-nuts] Z3801A ??
Jason,
Yes I have the users guide plus all the information I have found on
the Web. No where, that I have been able
Richard,
Thanks, I'll check it out.
Had
At 02:27 PM 3/18/2007, you wrote:
Had,
While I have been unsuccessful in finding a description of the Z3801
internal diagnostic LED's the 55300A GPS Telecom PRS Users Guide
(http://www.symmetricom.com/media/pdf/manuals/097-55300-01.pdf)
has a section in
Hi Gang,
My 3801, after many years, has developed a problem. SatStat and
GPSCon Health Monitor reports a self test error. It appears to have
no effect on GPS locking and frequency stabilization. All other
Health Monitors report OK.
In going through the information I have on the 3801 I can
Do you have the Z3801A GPS Receiver User's Guide PDF? If not you can find it
online with a little searching or I can email you the file if you want.
I glanced through it and it has some info about error codes and such.
Jason
Hi Gang,
My 3801, after many years, has developed a problem. SatStat
Speaking of which...
Was it someone on this list (that is willing to admit it) that won that
Z3801A?
I was thinking maybe it would go for around $500 (even that was a high-side
figure), but yeah I almost choked when I saw it sold for about $750!
Jason
I do not know, waiting for prices to fall
There's another one on EBay now, Item 200074342239, with a BIN of $700.
Wish I had bought more of them when they were advertised in QST a couple
years ago instead of only one..
R E Martinson
N1VQR
Waltham, MA
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I believe you could buy a Fury from Jackson Labs for about $750. It's specs
look pretty good.
Didier KO4BB
Jason Rabel [EMAIL PROTECTED] wrote:
Speaking of which...
Was it someone on this list (that is willing to admit it) that won that
Z3801A?
I was thinking maybe it would go for
On Sat, Jan 13, 2007 at 09:01:50AM -0500, Tim Shoppa wrote:
David I. Emery [EMAIL PROTECTED] wrote:
Which leaves the other question, from reading the 58540A
literature, manual and other material available I concluded four years
ago that it adjusted the 1 PPS timing to track GPS once
David I. Emery [EMAIL PROTECTED] wrote:
I see your point, an architecture with the VCXO derived 1 PPS
output NOT coherent with the 10 MHz would be somewhat unnatural and hard
to use in a system and presumably virtually ALL GPSDOs do phase lock the
10 MHz to the GPS time base rather than
David I. Emery [EMAIL PROTECTED] wrote:
Which leaves the other question, from reading the 58540A
literature, manual and other material available I concluded four years
ago that it adjusted the 1 PPS timing to track GPS once locked to GPS by
adjusting the EFC for the OXCO (I quite
to: John,KE5FX
Hi John
I read your question on the THUNDERBOLT look-alike sold by 'accelium'. Since
I have bought this unit (for 500$!!!), I can answer some of it:
The hp58533a has a similar form factor as the Thunderbolt but it's an
entirely different design. I made the following notes when
Regarding the Thunderbolt, I got some information from the Trimble sales
manager for timing products:
The Thunderbolt was designed and built in-house (of course from parts
bought from outside sources). So, the software and IP are Trimble, not
OEM'd. Any resemblance with the Symmetricom 58540A
On Fri, Jan 12, 2007 at 03:29:15PM -0600, Didier Juges wrote:
Regarding the Thunderbolt, I got some information from the Trimble sales
manager for timing products:
The Thunderbolt was designed and built in-house (of course from parts
bought from outside sources). So, the software and IP
Nice building
(I couldn't resist... When i see coordinates, I HAVE
TO go to maps.google.com to see whetre it is!!! Is it
officially recognized as being an addiction??) ;-=)
Have a good day!
73 de Normand VE2UM
Saint-Hubert (near Montreal), Qc. Canada
David I. Emery wrote:
As for performance, I am curious myself. Certainly the
Thunderbolt is better documented in respect to performance, but whether
in fact it actually IS a lot better when GPS locked is something I'd
like to know. Its firmware does seem to supply a lot more data
(http://www.jackson-labs.com/docs/Fury_Flyer.pdf)
It's available in double-oven version (SC-Cut Crystal) and single-oven
AT-cut.
Software compatible to the HP GPSDO's, but lot's better performance.
bye,
Said
Hi Said,
Maybe I'm missing something. Your PDF data sheet shows
a GPSDO with
Hi Rick, Jose, Hmurray,
forgot to mention:
the Fury unit only uses about 0.35A at 12V, and runs from 11V to 14V, so
it
can easily be run from a Pb battery, 4.5W power consumption. 45min
warmup
time typ. with the double-oven OCXO.
Said, this is very nice. Well done.
Better 100s Allan
Mark, John, Bill, Tom,
I received a number of off-line emails from you about the new Jackson-Labs
Fury GPSDO, thanks much for your interest! Let me try to address all of your
questions here, please excuse the long email.
I am loosely associated with Jackson-Labs - it carries my name :)
Hi Tom,
we mesaured an early Fury prototype against a PRS10 using the TSC5120A with
an external 5MHz MTI 260 type free-running OCXO as a reference. The Fury was
significantly better 100s against the MTI reference than the PRS10 was
against the MTI ref, almost a factor of 10x better 1s
Hi Tom,
The plot from the brochure that you are looking at is one you had measured
for us on the FireFox GPSDO predecessor, which did not have Temperature or
aging compensation, and had a much coarser TIM, DAC, and DAC reference etc but
used the same OCXO as the Fury. The Fury improves
Hi there Jose, Hmurray,
how about this one?
_http://www.jackson-labs.com/docs/Fury_Flyer.pdf_
(http://www.jackson-labs.com/docs/Fury_Flyer.pdf)
It's available in double-oven version (SC-Cut Crystal) and single-oven
AT-cut.
Software compatible to the HP GPSDO's, but lot's better
Hi Rick, Jose, Hmurray,
forgot to mention:
the Fury unit only uses about 0.35A at 12V, and runs from 11V to 14V, so it
can easily be run from a Pb battery, 4.5W power consumption. 45min warmup
time typ. with the double-oven OCXO.
Better 100s Allan Deviation stability than the PRS10 SRS
Unless you actually need portability, you might look for an HP Z3801
or similar GPS-stabilized quartz standard.
I haven't seen one on ebay for a while. Are they still available? Where?
Is there a good alternate I should be considering?
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The suespammers.org mail server is located in
Hello!
I am also looking for a GPS disciplined standard... what about the Lucent/
Efratom RFTG-m-XO ?
Regards,
JOSE
At 13:21 10/11/2006 -0800, you wrote:
Unless you actually need portability, you might look for an HP Z3801
or similar GPS-stabilized quartz standard.
I haven't seen one on
I noticed that the same seller who had the rubidium cell also had an HP
58533A for sale:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=290047717429
Don't know anything about those, but it looks a LOT like a Trimble
Thunderbolt. If it's built by HP to the same standards and specifications
as
Hi!
I have been looking on the tracking of the OCXO performence while having the
EFC input grounded. Yeah, it moves around all by itself. The free-running
10811 in the 4195 doesn't. It just keeps tracking away with its higher
frequency noise, but really not much lower frequency noise.
The OCXO
my z3801a, which has been working just fine for quite sometime now, had
a strange anomaly earlier today:
http://www.murgatroid.com/misc-pix/z3801a-glitch-20060613.png
tint = time interval (two left and middle left)
efc = vco efc setting (top right)
tunc = predicted mtie uncertainty
In message [EMAIL PROTECTED], Christopher Hoover writes:
as you can see the efc took a huge dive and then corrected itself.
Sometimes quartz crystals do step changes in resonance frequency
as a result of mechanical events in the crystal.
For instance high enerby cosmic rays can cause a
Looks like the Z3801A did just what it was supposed to, other than
taking an extra second for the leapsecond bit to clear:
53735.3 T22005123123595530+003F
53735.4 T22005123123595630+0040
53735.5 T22005123123595730+0041
53735.7 T22005123123595830+0042
53735.8
From: Tom Van Baak [EMAIL PROTECTED]
Subject: Re: [time-nuts] Z3801A predicted holdover phase drift convergence
Date: Mon, 1 Aug 2005 17:52:00 -0700
Message-ID: [EMAIL PROTECTED]
Is that a typo: 100-200 us?
I am sorry to say no, it is not a typo. This is why I started to wonder.
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