> $ sudo ldattach -d -s 9600 -n -8 -1 pps /dev/ttyUSB0
I assume you realize that PPS over USB isn't going to work well. (at least
by time-nuts standards)
There is also the opportunity for hanging-bridge type quirks.
--
These are my opinions. I hate spam.
_
On 09/30/2015 11:16 AM, David Gravereaux wrote:
> Hi,
>
> I started going through the docs and got a bit confused regarding
> [ldattach] for creating a PPS source.
>
> http://www.manualpages.de/OpenBSD/OpenBSD-5.0/man8/ldattach.8.html
^-- Oops, old man page not current to the 3.19.x kernel I'm u
Hi,
I started going through the docs and got a bit confused regarding
[ldattach] for creating a PPS source.
http://www.manualpages.de/OpenBSD/OpenBSD-5.0/man8/ldattach.8.html
port2 output would have been perfect to use, but ldattach doesn't have a
discipline for this binary format.
I was playin
ssage-
>>> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Tom
>>> Van Baak
>>> Sent: Tuesday, September 29, 2015 1:41 AM
>>> To: Discussion of precise time and frequency measurement
>>> Subject: Re: [time-nuts] Z3805A firmware?
>&g
On 09/29/2015 12:28 AM, Hal Murray wrote:
>
>> Good detective work. Yes, it sounds like a GPS 2^10 = 1024 WNRO issue, but
>> no one else has ever reported this AFAIK, so it's very curious.
>
> I've seen it on a Z3801A. I'm pretty sure I mentioned it here. That was
> several years ago.
>
> I t
> Good detective work. Yes, it sounds like a GPS 2^10 = 1024 WNRO issue, but
> no one else has ever reported this AFAIK, so it's very curious.
I've seen it on a Z3801A. I'm pretty sure I mentioned it here. That was
several years ago.
I think I had to set the time after power up but before it
On 09/28/2015 10:40 PM, Tom Van Baak wrote:
...
> 2) A decades-old surplus eBay GPSDO like this is good to absolutely stunning
> for home and casual lab use. But I would avoid using them for embedded,
> serious, professional, or life-safety applications. Can you tell us more what
> your applica
David Gravereaux wrote:
> I've had my unit off and in the closet for quite some time, then played
> around with it yesterday. :GPS:INIT:DATE wasn't taking 2015,09,28 and
> kept returning E-222 "data out of range" and was stuck in 1996. A few
> power cycles and it got to 2007. A few more power cy
Hi,
I've had my unit off and in the closet for quite some time, then played
around with it yesterday. :GPS:INIT:DATE wasn't taking 2015,09,28 and
kept returning E-222 "data out of range" and was stuck in 1996. A few
power cycles and it got to 2007. A few more power cycles and finally it
got it
The model number is that of an Oncore VP. It is easy to remove the receiver
from the unit for testing independently. That might be worth a try. Maybe
reseating it may help if there is any continuity problem on the pins.
Unfortunately you will probably need another VP to replace a dead one. IIRC,
Hi,
I've got a Z3805A that I bought off ebay a couple of
years ago, and it recently started going deaf, beginning
with an apparent loss of sensitivity leading to holdovers,
and more recently, receiver errors reported in the system
status.
I have the Z3805A, a thunderbolt, and one of the recen
On 2014-12-02 19:46, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
On 3 Dec 2014 02:08, "James Robbins" wrote:
Another option would be to hack the ntp software so it gives out a correct
date, assuming that you can determine what the
It was sold to me as a "Z3801A updated to 58503A ".
Howe
On 3 Dec 2014 02:08, "James Robbins" wrote:
>
> Brief update:
>
> This receiver (whatever it is) refuses to "forget" 1995 despite
un-powering, etc. I will learn to live with it, I think.
You could report it to the seller as a fault. He must have quite a bit of
experience on these.
Another optio
Hi
There’s a lot of commonality between the HP Z38xx designs up through the 3812.
They are by no means identical, but as you have seen, they are not terribly
different either.
Welcome to the wonderful world of China Surplus Inc.
It would not really surprise me to find that somebody simply gra
Brief update:
This receiver (whatever it is) refuses to "forget" 1995 despite un-powering,
etc. I will learn to live with it, I think.
It was sold to me as a "Z3801A updated to 58503A".
However:
1. The main board is labeled "Z3805A" (Not Z3801A) as are some of the chips.
2. It has only o
Hi
The unit will do just fine as a frequency / pps standard with the date error.
I believe the answer is a re-flash of the firmware in the GPS module. The first
step there is to figure out which module you have. If it’s a Motorola you may
be in luck. If it’s a Furono, you may be out of luck.
jsrobb...@earthlink.net said:
> I have tried commands (via GPSCon) to do a factory reset and to enter the
> date manually, but without success.
You may have to power it off so it forgets the date before it will take the
date from the serial port.
--
These are my opinions. I hate spam.
___
I've acquired a "Z3805A converted to a 58503A" which, notwithstanding tracking,
seems to believe that it is "17 March 1995". I believe this is the famous
"1024 week" issue. Does anyone know how to spring the unit from it's
historical bonds and get it to read the current date. I have tried com
Hi, I have two Z3805A's that I believe came from the same source as yours.
They both have RS-232 outputs.
Best
Regards
Mark Spencer
Message: 6
Date: Mon, 22 Apr 2013 15:26:14 -0700
From: Brooke Clarke
To: time-nuts@febo.com
Subject: [time-nuts] Z3805A Stock RS-232?
Messa
Hi:
I opened up my Z3805A and after looking at the bottom of the main board think
it's already jumpered for RS-232.
See the bottom photo at: http://www.prc68.com/I/Z3805A.html#DB-25 near the
DB-25 connector.
There's only 3 zero Ohm jumpers and none of them are where the Z3801 jumpers
were.
Al
Yes, indeed, I've got one with a 10811 and one with a symmetricom 5 MHz
oscillator with doubler.
Volker
Am 19.04.2013 01:15, schrieb Charles P. Steinmetz:
Check the output on a spectrum analyzer for 5 MHz content. I've seen
several internet-sourced Z3805As that were explicitly claimed to hav
I have two of these units and am quite pleased with them. Other than an app
note indicating that they are leap second compliant I've never seen any
documentation re the Z3805.
Sent from my iPad
___
time-nuts mailing list -- time-nuts@febo.com
To uns
Brooke wrote:
I'm trying to learn more about the HP Z3805A GPSDO.
http://www.prc68.com/I/Z3805A.html
It has an OCXO that I haven't seen before with a paper sticker with
it's p/n: 3505A09422
The "A" normally means made in America.
Check the output on a spectrum analyzer for 5 MHz content. I
On 18/04/13 22:41, Brooke Clarke wrote:
Hi:
I'm trying to learn more about the HP Z3805A GPSDO.
http://www.prc68.com/I/Z3805A.html
It has an OCXO that I haven't seen before with a paper sticker with it's
p/n: 3505A09422
The "A" normally means made in America.
Does anyone know more about it?
n
Behalf Of Brooke Clarke
Sent: Thursday, April 18, 2013 4:41 PM
To: time-nuts@febo.com
Subject: [time-nuts] Z3805A OCXO p/n 3505A09422?
Hi:
I'm trying to learn more about the HP Z3805A GPSDO.
http://www.prc68.com/I/Z3805A.html
It has an OCXO that I haven't seen before with a paper sticker wi
It looks more like a HP serial number.
Tom
- Original Message -
From: "Brooke Clarke"
To:
Sent: Thursday, April 18, 2013 5:41 PM
Subject: [time-nuts] Z3805A OCXO p/n 3505A09422?
Hi:
I'm trying to learn more about the HP Z3805A GPSDO.
http://www.prc68.com/I/Z3805A.
Hi Brooke,
On 04/18/2013 11:41 PM, Brooke Clarke wrote:
Hi:
I'm trying to learn more about the HP Z3805A GPSDO.
http://www.prc68.com/I/Z3805A.html
It has an OCXO that I haven't seen before with a paper sticker with it's
p/n: 3505A09422
The "A" normally means made in America.
Does anyone know
On 4/18/2013 5:41 PM, Brooke Clarke wrote:
It has an OCXO that I haven't seen before with a paper sticker with it's
p/n: 3505A09422
The "A" normally means made in America.
It's a double oven HP 10811A, you're looking at the serial number sticker.
___
Hi:
I'm trying to learn more about the HP Z3805A GPSDO.
http://www.prc68.com/I/Z3805A.html
It has an OCXO that I haven't seen before with a paper sticker with it's p/n:
3505A09422
The "A" normally means made in America.
Does anyone know more about it?
http://www.prc68.com/I/Z3805A.html#OCXO
A
] On Behalf
Of cfo
Sent: Thursday, 18 April 2013 4:32 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3805A high value PU
On Wed, 17 Apr 2013 08:26:08 +, Mark C. Stephens wrote:
>
> On a more serious note, I have rack mounted both clocks with UPS power
> and they shall not be d
On Wed, 17 Apr 2013 08:26:08 +, Mark C. Stephens wrote:
>
> On a more serious note, I have rack mounted both clocks with UPS power
> and they shall not be disturbed.
> http://www.vk2hmc.net/blog/?p=86
>
>
> Many thanks,
Is it wise to install an unregulated fan inside the 3805 housing , so
.com] On Behalf
Of Tom Van Baak
Sent: Thursday, 18 April 2013 2:21 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3805A flash dump.
I suspect your reader is not configured correctly. For example, look at the
first 80 bytes of each BIN file; they should not be so identical.
After you
ormation about the involved components.
best,
Herbert
> -mark
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Herbert Poetzl
> Sent: Thursday, 18 April 2013 12:43 AM
> To: Discussion of precise time and frequency
want.
See http://leapsecond.com/museum/z3801a/eeprom.htm for an example of the result.
/tvb
- Original Message -
From: "Mark C. Stephens"
To:
Sent: Wednesday, April 17, 2013 1:31 AM
Subject: [time-nuts] Z3805A flash dump.
I have dumped the 4 flash ROMS from my latest Z3805A but I can
In message , "Tom Van Baak" writes:
>After you fix that, then combining low/high bytes will give you
>what you want. See http://leapsecond.com/museum/z3801a/eeprom.htm
>for an example of the result.
>
>/tvb
If anybody feels like disassembling the code, I have started a python
based "reverse engin
result.
/tvb
- Original Message -
From: "Mark C. Stephens"
To:
Sent: Wednesday, April 17, 2013 1:31 AM
Subject: [time-nuts] Z3805A flash dump.
>I have dumped the 4 flash ROMS from my latest Z3805A but I can't make head nor
>tail of the contents. I am thinking the
, 18 April 2013 12:43 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3805A flash dump.
On Wed, Apr 17, 2013 at 08:31:49AM +, Mark C. Stephens wrote:
> I have dumped the 4 flash ROMS from my latest Z3805A but I can't make
> head nor tail of
On Wed, Apr 17, 2013 at 08:31:49AM +, Mark C. Stephens wrote:
> I have dumped the 4 flash ROMS from my latest Z3805A but
> I can't make head nor tail of the contents.
> I am thinking the flash are interleaved.
Interleaving makes sense for performance reasons and
usually happens at bit or by
I have dumped the 4 flash ROMS from my latest Z3805A but I can't make head nor
tail of the contents. I am thinking the flash are interleaved.
http://www.vk2hmc.net/blog/wp-content/uploads/2013/04/z3805-flash.rar
I can't see any strings that make sense like the Z3801A flash.
___
.net/blog/?p=86
Many thanks,
mark
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Charles P. Steinmetz
Sent: Wednesday, 17 April 2013 4:03 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3805A high
Mark wrote:
For the first 6 hours PU stayed at 432us, then it dropped sharply to
5.6us and then slowly climbed to 18us.
Doesn't seem right to me.
Nothing it does in the first 6 hours has anything to do with
anything. (1) The oscillator will be swinging around wildly
(comparatively speaking
On 4/16/13 8:28 PM, Mark C. Stephens wrote:
Actually, before I plugged the GPS antenna into the second unit, I checked out
where it last called home:
LAT N 36:01:05.225
LON E 128:41:48.761
HGT+1214.14 m (MSL)
Mt Palgong, according to Google Earth
Lots of transmitter towers up there,
ssion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3805A high value PU
Mark wrote:
>I recently purchased a pair of Z3805A
>
>The problem I am seeing on both is the predicted uncertainty is high
>compared to other receivers I have seen.
>
>I am experienci
Mark wrote:
I recently purchased a pair of Z3805A
The problem I am seeing on both is the predicted uncertainty is high
compared to other receivers I have seen.
I am experiencing a PU of ~8us for the first and ~24us for the second.
My questions are,
What could be causing such bad figures?
Is
Dear Fellows,
I recently purchased a pair of Z3805A off eBay seller tommy_chou.
I have fired them up with a MaxRad 26db timing antenna attached to each.
The antennae have a clear view of most of the sky.
The receivers are having no problems seeing enough satellites.
The problem I am seeing on b
On Thu, Apr 04, 2013 at 02:54:09PM -0400, Paul wrote:
>1 3 0 9 4 1 4 2 8 4 4 = 1309412844
>>> I can see its transmitting the even second time but what format
>>> is this and how can I use it?
>> $ date +"%s" # unix time (seconds since Jan, 1st, 1970)
>> 1365086814
>> so, my guess
1 3 0 9 4 1 4 2 8 4 4 = 1309412844
>
> > I can see its transmitting the even second time but what format
> > is this and how can I use it?
>
> $ date +"%s" # unix time (seconds since Jan, 1st, 1970)
> 1365086814
>
> so, my guess is, it is seconds since some point in
> time in decimal.
On Thu, Apr 04, 2013 at 08:28:58AM -0700, Jim Lux wrote:
> On 4/4/13 7:52 AM, Herbert Poetzl wrote:
>> On Thu, Apr 04, 2013 at 02:32:09PM +, Mark C. Stephens wrote:
>>> I wanted to have a look at what the Z3805A puts out on Port 2.
>>> I can see the LEDS flickering on the BOB so its saying som
he 01 might mean locked to
GPS.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Jim Lux
Sent: Thursday, April 04, 2013 11:29 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3805A Port 2.
On 4/4/13 7:52 AM, Herbert Poetzl wrote:
>
On 4/4/13 7:52 AM, Herbert Poetzl wrote:
On Thu, Apr 04, 2013 at 02:32:09PM +, Mark C. Stephens wrote:
I wanted to have a look at what the Z3805A puts out on Port 2.
I can see the LEDS flickering on the BOB so its saying something.
I connected up a terminal program set to 96008N1 and it s
On Thu, Apr 04, 2013 at 02:32:09PM +, Mark C. Stephens wrote:
> I wanted to have a look at what the Z3805A puts out on Port 2.
> I can see the LEDS flickering on the BOB so its saying something.
> I connected up a terminal program set to 96008N1 and it seems there is
> nothing.
> So I plugged
I wanted to have a look at what the Z3805A puts out on Port 2.
I can see the LEDS flickering on the BOB so its saying something.
I connected up a terminal program set to 96008N1 and it seems there is nothing.
So I plugged the cable into port one to check the settings:
scpi > syst:comm:ser2:pace?
N
not perfect and I have to improve that.
>> The log is running every 5 minutes and I didn't notice a holdover mode of
>> the oscillator.
>>
>> (I've bought this GPSO to check the frequency of my 5334B for gates times of
>> 60s and 100s. I know I can use the
__
De : Volker Esper
À : time-nuts@febo.com
Envoyé le : Jeudi 28 février 2013 2h12
Objet : Re: [time-nuts] Z3805A/58503A time receiver : 2 questions
If your unit is exactly like that on ebay 251226027893, it has a 10 MHz HP
oscillator in a double oven, and it's absolutely sure that it&
5334B for gates times of
60s and 100s. I know I can use the 10MHz of the GPSDO as Frequency Reference
for the 5534B but I wanted to check its frequency first !)
De : Volker Esper
À : time-nuts@febo.com
Envoyé le : Jeudi 28 février 2013 2h12
Objet : Re: [ti
If your unit is exactly like that on ebay 251226027893, it has a 10 MHz
HP oscillator in a double oven, and it's absolutely sure that it's got a
6 channel receiver.
I should have read before, sorry.
I'm still not sure about your antenna, is it a Garmin? Well, it's most
likely an active type
I just calculated the frequency offset. I count 5 crosses, while jumping
down to 200 ns, I guess, 1 cross equals 10 min? So let's say the jump
lasts 60 min (= T jump). When we want to calculate the frequency offset
out of a phase jump, we have to differentiate the phase and we should
achieve
Hi Claude!
Said says, you should see 6+ sats, I guess he means _at_least_ six. I'm
almost sure, you've got a 6 channel receiver, so you naturally cant't
get more than 6 sats at a time.
There are some different models of the Z3805A out there, though they're
all named the same. I've got two u
Hello Claude,
that gap is a classic crystal jump. It could be caused by the crystal
changing frequency by itself, or by being hit with e.g. gamma particles etc.
Could also have been instigated by vibration or shock to the unit.
You should be seeing 6+ sats at all times though, your plot sho
Hello,
This is my first message here although I read this list for a few weeks.
I bought a Z3805A/58503A frequency receiver and I didn't notice on the
pictures that the model number was not written on the front panel. It's not
important but is there a reason for that, if you know ?
The item
Hi
I think you will find that the Z3805 uses Motorola protocol to communicate with
the GPS. If you do not have the "right" Motorola GPS the firmware in the Z3805
will not work.
Bob
On Feb 6, 2013, at 3:20 AM, Pierre-François (f5bqp_pfm)
wrote:
> Hi the Timing-Gang,
>
> I got very recently
Hi the Timing-Gang,
I got very recently a Z3805A GPSDO six channels coming from China from
one of the most serious Chinese shop on The Bay ... :-D :-D :-D
It's a six channels GPS unit and I would like to upgrade it by myself
with a 12 channels using a Jupiter GPS module or Motorola ones I belie
Mark,
On 12/26/2012 06:24 PM, Mark Spencer wrote:
Tom, Magnus, Ulrich:
Thanks for the comments and suggestions. They are appreciated and I
now have an even better understanding of why ADEV measurements are
not a good tool for characterizing the performance of oscillators that
are subject to tr
e, 25 Dec 2012 03:12:51 +0100
> From: Magnus Danielson
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] Z3805A cooling requirements?
> Message-ID: <50d90ba3.5060...@rubidium.dyndns.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hi,
>
>
an it's appropriate in every case.
> When your data has an accidental data glitch or an
> intentional transient, it's best not to use statistics to
> describe that one event.
>
> /tvb
>
> - Original Message -
> From: "Mark Spencer"
> To:
>
Hi,
On 12/24/2012 06:47 PM, Tom Van Baak wrote:
Hi Mark,
I wouldn't place much emphasis on the Adev data for Tau's of less than 80
seconds.
Actually, just the opposite; the ADEV at short tau is very close to correct.
I've collected some ADEV data as well but don't entirely trust it yet.
has an accidental
data glitch or an intentional transient, it's best not to use statistics to
describe that one event.
/tvb
- Original Message -
From: "Mark Spencer"
To:
Sent: Monday, December 24, 2012 6:58 AM
Subject: Re: [time-nuts] Z3805A cooling requirements?
Volk
Volker et al..
I placed a small muffin fan near one of my Z3805's. The modest air flow seems
to have some affect on the units operation.
I've collected some ADEV data as well but don't entirely trust it yet.
Amongst other issues I had a lengthy power failure at my residence four days
ago s
> I wonder if the forced convection is to strong. You don't want to
> hit the limits of the oven control-range. Wonder if this is a
> long-term effect and if even small adjustment to the setup can
> remove the bursts of noise you are seeing.
Now, some hours after switching off the fan, I'm disco
On 12/22/2012 06:44 PM, Volker Esper wrote:
Thank you for your statement, I have to think about it.
It seems to be clear, that ADEV/MDEV aren't the convenient tools for
characterizing such an event. My goal was to answere the question asked
in the beginning of this thread: Does a constant ventil
Hi Volker,
On 12/22/2012 04:55 AM, Volker Esper wrote:
Although I am dog-tired it gives me no peace...
I come to the following conclusion:
- The long term Allan deviation gets worse, as long, as the effect of
EFC compensating is in the range of tau
- But: It gets back to its normal value after
Although I am dog-tired it gives me no peace...
I come to the following conclusion:
- The long term Allan deviation gets worse, as long, as the effect of
EFC compensating is in the range of tau
- But: It gets back to its normal value after that
- The short term deviation, however, increases s
Diagram 2 shows the MDEV values of my GPSDO varying over the time, due
to blowing air at the OCXO - not the frequency of an OCXO. I'm still
hoping, that my MDEVs do not age :-)
Am 22.12.2012 04:00, schrieb Bob Camp:
Hi
In most cases, when you see an OCXO (or TCXO) begin to rise past a few
Hi
In most cases, when you see an OCXO (or TCXO) begin to rise past a few thousand
seconds, you are either looking at aging or the room temperature.
Bob
On Dec 21, 2012, at 9:54 PM, Volker Esper wrote:
> Here come the curves...
>
> You'll find two diagrams. The first (named "1_DF9PL...") sho
...and we do not know how much air flow and how turbulent each of us
applied. We can only give an _idea_ of what happens and in which order
of magnitude it could be.
When Stu started the thread (elderly time nuts can surely recall) his
question was about cooling a Z38xx unit. I recommended b
Great plots guys!
Looking at these results I think my original claim still holds: ADEV goes up
when a fan is involved versus no fan, even on a double oven 10811..
Clearly visible on the 10811, maybe not so much on the MV89 but that unit seems
to have frequency moves into the xE-010 region on Ma
Yes, I made such a setup, it's now running 22 hours. I'll post the
results in two hours or so (if nothing evil happens to the earth,
meanwhile).
Volker
Am 21.12.2012 03:35, schrieb saidj...@aol.com:
Wish I had more time to play with this setup.
How about fellow time nuts spend some time a
Wish I had more time to play with this setup.
How about fellow time nuts spend some time and present similar test data on
their OCXO's to compare?
I was interested in the 1s to 100s ADEV, and my runs were from 8 minutes to
20 minutes, certainly enough time to capture data for 1s to 100s ADE
Magnus Danielson said the following on 12/20/2012 05:29 PM:
On 12/20/2012 10:19 PM, John Ackermann N8UR wrote:
TimeLab can talk directly to the 512x boxes via ethernet. I've also
written some Linux scripts to capture both phase data and graphs from
the 5120; happy to share with anyone who'd like
On 12/20/2012 10:19 PM, John Ackermann N8UR wrote:
TimeLab can talk directly to the 512x boxes via ethernet. I've also
written some Linux scripts to capture both phase data and graphs from
the 5120; happy to share with anyone who'd like them (but TimeLab is a
whole lot easier in most cases).
If
Hi!
On 12/20/2012 01:36 PM, Bob Camp wrote:
Hi
Did I miss part of the data?
The plot I got shows about 9 minutes. Temperature step stress takes a *long*
time to settle out.
I too felt the data was short. For relative mediocre oscillators I at
least measure an hour. For quality rocks, that'
On 12/20/2012 01:34 PM, Bob Camp wrote:
Hi
Temperature transients are not a good thing for an OCXO. If you deliberately
use the fan to create a transient, then yes the OCXO will not be happy. The
question it - what happens after the transient has settled out? The plot you
have still looks a l
TimeLab can talk directly to the 512x boxes via ethernet. I've also
written some Linux scripts to capture both phase data and graphs from
the 5120; happy to share with anyone who'd like them (but TimeLab is a
whole lot easier in most cases).
John
On 12/20/2012 4:09 PM, Bob Camp wrote:
Hi
Y
ecise time and frequency measurement
Subject: Re: [time-nuts] Z3805A cooling requirements?
Bob,
The ADEV plot was done after the unit had fully settled to it's new location
in front of the 53132A fan.
The Tsc5125A instrument has a limit of 9 minutes to plot the frequency drift
for some reason
Bob,
The ADEV plot was done after the unit had fully settled to it's new location in
front of the 53132A fan.
The Tsc5125A instrument has a limit of 9 minutes to plot the frequency drift
for some reason, so I can only show you the last 9 minutes.
The transient due to the new temperature was lo
Hi
Did I miss part of the data?
The plot I got shows about 9 minutes. Temperature step stress takes a *long*
time to settle out.
Bob
On Dec 19, 2012, at 9:56 PM, saidj...@aol.com wrote:
> Not sure about that, if you look at the frequency plot after ~20 minutes in
> moving air the frequency
Hi
Temperature transients are not a good thing for an OCXO. If you deliberately
use the fan to create a transient, then yes the OCXO will not be happy. The
question it - what happens after the transient has settled out? The plot you
have still looks a lot like a step function.
Bob
On Dec 19, 2
: [time-nuts] Z3805A cooling requirements?
Not sure about that, if you look at the frequency plot after ~20 minutes in
moving air the frequency was still extremely close to 10.00MHz.. to
ithin <1E-011 of 10MHz. This is a free-running 10811.
ompare that to the plot of the OCXO I had s
Not sure about that, if you look at the frequency plot after ~20 minutes in
moving air the frequency was still extremely close to 10.00MHz.. to
within <1E-011 of 10MHz. This is a free-running 10811.
Compare that to the plot of the OCXO I had sent out some hours ago when it
was running s
I think the data shows that the heaters were losing ground, which would explain
the steadily falling temp of the SC cut quartz.
Thomas Knox
From: saidj...@aol.com
Date: Wed, 19 Dec 2012 21:28:15 -0500
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3805A cooling requirements?
Bob,
I
Hi
Ok, what happens if you keep the air gun in the exact same position and let it
stabilize for an hour with no insulation around the OCXO ?
Bob
On Dec 19, 2012, at 7:24 PM, saidj...@aol.com wrote:
> Hi Bob, et. al.,
>
> this discussion prompted my interest to see how a 10811-600160 unit that
Hi Bob, et. al.,
this discussion prompted my interest to see how a 10811-600160 unit that we
have sitting here on the bench would react to airflow changes. I had a
thin layer of anti-static shipping material around the unit, and I opened up
one side of that layer and then pushed air into th
is much more stable.
>
> Didier
>
> Sent from my Droid Razr 4G LTE wireless tracker.
>
>
>
> -Original Message-
> From: Bob Camp
> To: Discussion of precise time and frequency measurement
> Sent: Sun, 16 Dec 2012 7:47 PM
> Subject: Re: [time-nuts] Z380
Hi Bob,
Herein lies the problem. The MV89 you linked to on eBay is a Dash-A part, so
the lowest stability one.. Hard to get the more stable ones.
Also, I am not looking for a single unit from EBay, I'm interested in sustained
production/reasonable pricing. Morion is very hard to deal with, and
Hi
… and what I'm trying to say also comes from the real world...
If you start putting "stuff" on an OCXO, be careful about the case temperature
and how the OCXO is spec'd. A few mm of dead air can make a good insulator.
That can boost the case temp quite a bit.
Bob
On Dec 16, 2012, at 9:06 PM
> Didier
>
> Sent from my Droid Razr 4G LTE wireless tracker.
>
>
>
> -Original Message-
> From: Bob Camp
> To: Discussion of precise time and frequency measurement
> Sent: Sun, 16 Dec 2012 7:47 PM
> Subject: Re: [time-nuts] Z3805A cooling requirements?
On 12/17/2012 02:47 AM, Bob Camp wrote:
Hi
The gotcha here is that an un-cooled piece of gear will heat up and cool down as it's
work load changes. There is no "magic bullet" that keeps the temperature
constant with zero airflow in a normal design. Yes, I'm old enough to remember oil cooled
Said Jackson
> To: Discussion of precise time and frequency measurement
> Cc: Discussion of precise time and frequency measurement
> Sent: Sun, 16 Dec 2012 7:16 PM
> Subject: Re: [time-nuts] Z3805A cooling requirements?
>
> One item I forgot to mention:
>
> One of the most a
,
which means it is much more stable.
Didier
Sent from my Droid Razr 4G LTE wireless tracker.
-Original Message-
From: Bob Camp
To: Discussion of precise time and frequency measurement
Sent: Sun, 16 Dec 2012 7:47 PM
Subject: Re: [time-nuts] Z3805A cooling requirements?
Hi
The gotcha
measurement
Cc: Discussion of precise time and frequency measurement
Sent: Sun, 16 Dec 2012 7:16 PM
Subject: Re: [time-nuts] Z3805A cooling requirements?
One item I forgot to mention:
One of the most airflow sensitive parts inside a GPSDO is the tcxo used on the
GPS receiver. Some GPS don't even
1 - 100 of 126 matches
Mail list logo
