I'm looking for documentation on two HP boards that are part of a module.
The frame is labeled 05061-6168 and has an 10811-60109 oscillator, a board
labeled 05061-6199 61003F and a second board labeled 05061-6198 61103F.
Both boards are labeled “Series 2552”. The first board (6199) and th
Said,
Patiently waiting for my 10 mhz unit. What are your ideas on using it to
control a 10811 instead of the built in 10 mhz osc? Will there be enough
control voltage for the 10811?
Regards,
Bill Riches
Cape May, NJ
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.co
> Close, but it's for the 105, not the 5061, and the boards are physically very
> different.
The 5061A upgrade used those 105-series boards. With the 5061B, they changed
the part number of A1A3 (the OCXO interface board) from 00105-6044 to
05061-6198, but I don't see any major differences in th
I just posted some photos at:
http://home.comcast.net/~rdirosario/site/?/page/HP_5061-6168_photos/
- Original Message -
From: "John Miles"
To: "Discussion of precise time and frequency measurement"
Sent: Tuesday, April 30, 2013 10:53:49 PM
Subject: Re: [time-n
day, May 1, 2013 11:15:56 PM
Subject: Re: [time-nuts] 10811
I just posted some photos at:
http://home.comcast.net/~rdirosario/site/?/page/HP_5061-6168_photos/
- Original Message -
From: "John Miles"
To: "Discussion of precise time and frequency measurement"
Sent:
The HP10811's frequency being as sensitive to load as it is.
For the best short and long term frequency stability and Allan noise
performance (and spectrum purity), does the 10811 osc work best if driving a
high impedance or a 50 ohm load ... or other?
ws
__
Didier,
My experience with 4 10811's with widely separated serial numbers is consistent
with your
numbers below. Between 6 and 8 minutes of warm up from ambient (18C) and
they're stable at the
target frequency as measured with a recently calibrated 5328A (one without a
10811 - since
remediat
I was looking at the pictures on the realhamradio website, and while he has
the B version the insides seem pretty similar.
Once you take off the top plate there is a thin piece of loose insulation,
when you remove that there is the main assembly inside. Does this assembly
simply 'pull' out or do I
On the PSTI message fields question, I am checking into it, will get back
soon with an answer.
On the 10811, that OCXO can typically be mechanically tuned to have a 1.5V
nominal EFC set voltage. The LTE-Lite can drive from 0V to 3.0V EFC, so
that should be more than required on a good (well
Hi
The 10811 is a leaded part pc board construction. If you don’t mind tearing it
down to pieces, you can make the EFC do just about anything you wish.
Bob
> On Nov 17, 2014, at 8:32 PM, S. Jackson via time-nuts
> wrote:
>
> On the PSTI message fields question, I am checking into it, will ge
I ground one side of the tuning diode and use the 2 to 12 V as the external
OCXO for my FRK's along with increasing the time constant. I have not
verified it but I think removing the zener Voltage should also improve ADEV.
Bert Kehren
In a message dated 11/17/2014 8:46:34 P.M. Eastern Stan
As you all know, but has not been mentioned, is that there are many versions
of the venerable 10811, which different specifications, including phase
noise and stability.
The well known HP document 90027-1 lists many of them, and thanks to TVB, it
is here:
http://www.leapsecond.com/museum/10811
On 11/17/2014 5:54 PM, Bert Kehren via time-nuts wrote:
I ground one side of the tuning diode and use the 2 to 12 V as the external
OCXO for my FRK's along with increasing the time constant. I have not
verified it but I think removing the zener Voltage should also improve ADEV.
Bert Kehren
Hi Rick:
When working on Tunnel Diode amplifiers we used (AFAICR) 5.1 V Zener diodes to stabilize the lower voltage that drive
the diode.
5.1V was supposed to have excellent temperature characteristics in terms of repeatability (don't remember if low noise
was part of the selection criteria).
ator diode
("zener"so called) specced at around 5 to 5.5 volts has a near zero
overall tempco.
Alan
G3NYK
- Original Message -
From: "Brooke Clarke"
To: "Discussion of precise time and frequency measurement"
Sent: Tuesday, November 18, 2014 10:31 PM
S
Yes, 5.1V Zeners (or something like that) have a "magic" zero tempco if
you put a conventional diode in series with it. I used to know
stuff like that during the Jurassic period.
However, the diode in the 10811 is ovenized, so that is not so
important. 6.2V was chosen to get +/- 5V tuning range
Hi
Most charts show the temperature coefficient going through zero around 5V and
passing 2 mV/C in the vicinity of 6V.
Bob
> On Nov 18, 2014, at 12:10 PM, Richard (Rick) Karlquist
> wrote:
>
>
>
> On 11/17/2014 5:54 PM, Bert Kehren via time-nuts wrote:
>> I ground one side of the tuning d
Bill,
this would be a good question for time-nuts (CCd here).
I don't know what slope your particular oscillator has, but if it is
negative then years ago someone posted schematics on how to invert the slope
and
how to offset the EFC voltage and change the range etc using an Opamp..
That
List,
It appears from Bob Camp’sexperience (and others) that the Chicoms Morion
oscillators are to be avoided.
My question is: Could Bob Camp,Rick K. and other gurus with experience come up
with a list of the Ebay 10 MHzsurplus oscillators that would be worth buying as
well as what would
OK, maybe if I just attach the file rather than trying to embed it?
A while back, someone asked how to use the EFC on a 10811 to allow
fine frequency adjustment without spoiling the inherent stability of
the oscillator. I finally found a copy of the schematic for the
circuit I have used with
Dear all,
does anybody out there know the orientation of the crystal faces relative to
the outer case in a 10811-60111?
(The sense of the question is that we are considering building a 3-axis
apparatus for gravity-related tests. Note, based on our tentative modelization,
crystals are not reque
A lot of the ballistic GPS systems are actually GPS transponders attached to
the back of the shell. They just retransmit the received GPS signal spectrum
to a remote receiver. Much cheaper and more robust than slinging a full GPS
receiver. Google TIDGET for more info...
---
I have it driving a 75 ohm load and have noticed no problems. But then, I'm
not the most obsessive of the nuts... [?]
On Tue, Dec 7, 2010 at 12:32 PM, WarrenS wrote:
>
> The HP10811's frequency being as sensitive to load as it is.
> For the best short and long term frequency stability and
Since the output stage is a common emitter stage with series resistive
feedback in the emitter, it will produce higher distortion with high
impedance loads due the increased collector voltage swing and subsequent
larger non linear collector base capacitance modulation combined with
the higher c
Being a Shera Fan I finally broke down and bought a Tbolt. I experimented
with a foam enclosure with roughly 1 centimeter on all sides. What I found
that it only increased the board temperature by 19 C. It was still as
sensitive to ambient. Thanks to Lady Heater it even shows an increase o
How are the 10811 OCXOs serially numbered ?
I ask this, because from a photo on eBay I saw a 10811-60111 with
serial number 2850A47273, a rather long number. The 10811-60111 in my
5328 counter has as S/N the number A03912, which looks like it belongs
to a different numbering scheme.
On this unit, I suspect the oven was not at the correct operating
temperature. Thus, although it warmed up to some extent, it may
not have reached 80 degrees C. The real diagnostic would be to
slide it out of the case and look at the voltages on the thermistor
circuitry. However a crude check ca
Subject: Re: [time-nuts] 10811 warmup
On this unit, I suspect the oven was not at the correct operating
temperature. Thus, although it warmed up to some extent, it may
not have reached 80 degrees C. The real diagnostic would be to
slide it out of the case and look at the voltages on the thermistor
Jack Hudler wrote:
>
> Could physical damage to the crystal account for this deviation?
Pretty unlikely. If you drop a crystal, it will just break and
not work. The only way it could go down 100 Hz is by mass loading.
I don't know how this could happen in a sealed unit.
Rick Karlquist N6RK
__
Okay, I finally got around to building a little interface for my HP 10811's
this afternoon. I'm using a 24V supply for the oven. I built the oven
monitor LED circuit like in the manual so I know when it is warmed up so I
don't have to always probe the pin. Finally I'm using a linear regulator to
dr
Jason Rabel wrote:
> I was looking at the pictures on the realhamradio website, and while he
> has
> the B version the insides seem pretty similar.
>
> Once you take off the top plate there is a thin piece of loose insulation,
> when you remove that there is the main assembly inside. Does this asse
> Anyhow... The 10811-60155 that I got from 'her' I tried out first. No 10
> MHz output at all, not from initial power up or after it warmed up...
I probably have been through at least 15-20 10811's and 10544's. I've seen
this behavior only once. In this case, it was a busted crystal. It wa
Well, we shall see, hopefully I'll get a chance to mess with it tomorrow,
but more than likely it will be Monday. I skimmed over the end of the manual
for some troubleshooting and the schematics. I haven't read them carefully
yet. The oven warms up (both via the signal pin and the whole housing is
> Is it okay to power up the main assembly once it is removed from the
> outer shell / insulation?
Lots of info here:
http://www.hparchive.com/Manuals/HP-10811AB-Manual.pdf
I think I saw a warning about that, but maybe it was something else.
--
These are my opinions, not necessarily my emp
Hal Murray wrote:
>> Is it okay to power up the main assembly once it is removed from the
>> outer shell / insulation?
>>
>
> Lots of info here:
> http://www.hparchive.com/Manuals/HP-10811AB-Manual.pdf
>
> I think I saw a warning about that, but maybe it was something else.
>
>
>
It is O
It's bizarre..
The oscillator is some kind of Colpitts but with coils
instead of capacitors in the feedback path.
(i don't call it a Hartley, bcause Hartley's use a
SINGLE tapped inductor.)
73 de Normand VE2UM
--- Dr Bruce Griffiths <[EMAIL PROTECTED]>
wrote:
> Hal Murray wrote:
> >> Is it oka
Normand Martel wrote:
> It's bizarre..
>
> The oscillator is some kind of Colpitts but with coils
> instead of capacitors in the feedback path.
>
> (i don't call it a Hartley, bcause Hartley's use a
> SINGLE tapped inductor.)
>
> 73 de Normand VE2UM
>
> --- Dr Bruce Griffiths <[EMAIL PROTECTED]>
>
The oscillator is derived from a conventional Colpitts
circuit, with a capacitor from base to emitter, a
capacitor from collector to emitter, and the crystal
(in parallel resonance mode acting as an inductor) from
the collector to the base. This is referred to as a
Pierce oscillator.
The desired
Dr Bruce Griffiths wrote:
> Some form of mode suppression is required in most precision overtone
> oscillators.
>
> Bruce
>
I forgot to mention that the 10811 operates on the 5th overtone,
and it is also necessary to prevent oscillation at other overtones.
The mode suppression design takes care o
and frequency measurement
Subject: Re: [time-nuts] 10811 warmup
The oscillator is derived from a conventional Colpitts
circuit, with a capacitor from base to emitter, a
capacitor from collector to emitter, and the crystal
(in parallel resonance mode acting as an inductor) from
the collector to the
DUH! You wrote it Rick! LOL!
http://www.hpl.hp.com/techreports/1999/HPL-1999-6.pdf
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While looking for something else I stumbled on an eBay seller in Hong
Kong offering five 113°C thermal fuses for $6 including shipping, which
seems like a reasonable deal...
Item number:130579771801
Usual disclaimers apply, and before anyone complains, yes, it's a
generic photo.
Dan
_
Just speaking of 10811 clones, I have one made by Piezo Systems, model #
2810007-1. It fits electrically and mechanically HP boards, and looks like a
10811. But I miss the specs. Does anybody have any info?
Thanks,
Antonio
> Geoff Blake wrote:
> > Hi,
> >
> > I know this has been asked before -
> Just speaking of 10811 clones, I have one made by Piezo Systems,
> model # 2810007-1. It fits electrically and mechanically HP boards,
> and looks like a 10811. But I miss the specs. Does anybody have any info?
>
> Thanks,
> Antonio
Yep, I have one of those also. From what I gather they were us
Jason wrote:
> > Just speaking of 10811 clones, I have one made by Piezo Systems,
> > model # 2810007-1. It fits electrically and mechanically HP boards,
> > and looks like a 10811. But I miss the specs. Does anybody have any
info?
> I've been unable to find any info but logic would dictate their
I'm sure this has been discussed to death before, but does anyone know
of a source of thermal fuses small enough to fit in the -hp- 10811? I
have found plenty of larger ones, none of which will fit and would
rather not just link it out.
Dan
___
time
Hi
As best anybody can tell, the improved phase noise and ADEV 10811’s came out of
a screening / select process. There is a finite chance that a “normal part
number” 10811 could be as good as or better than a part from one of the “better
part number” versions.
Bob
> On Nov 17, 2014, at 9:42 P
Is there a quick and dirty summary of which are the "good" 10811's? Otherwise,
I clearly need to go through my collection and characterize them! :)
I should probably do that anyway...
> On Nov 17, 2014, at 21:50, Bob Camp wrote:
>
> Hi
>
> As best anybody can tell, the improved phase noise
Bob wrote:
As best anybody can tell, the improved phase noise and ADEV 10811's
came out of a screening / select process. There is a finite chance
that a "normal part number" 10811 could be as good as or better than
a part from one of the "better part number" versions.
That is particularly tr
Does anyone have a working oven controller board for a 10811 that they would
wish to sell? I have a good osc but the oven board is bad.
73,
Bill, WA2DVU
Cape May
---
This email has been checked for viruses by Avast antivirus software.
http://www.avast.com
__
Hi
There is no reason (at this point) to do anything other than characterize what
you have. Parts age, repairs are made, stuff happens (shock / vibration /
rain).
Bob
> On Nov 17, 2014, at 10:13 PM, bownes wrote:
>
> Is there a quick and dirty summary of which are the "good" 10811's?
> Oth
Hi
I don’t think there’s anything at all wrong with the MV-89A as an OCXO. In
fact, I believe that properly
handled they are a good part. The gotcha is the abuse they get in the
“recycling” process. I’m
willing to bet that any OCXO that sees the same sort of process will come out
with issues.
I would personally consider those MV89s from Chinese sources as being extra
suspect - a few years back, one of the Chinese surplus vendors had a big
box of them (some removed from PCBs, and others apparently new) that were
identified to me as containing bad ceramic caps and suffering from various
p
Hi
I probably should not rule out the MV89’s going through an exceptionally brutal
salvage process. I’m sure there are a range of outfits doing this stuff and
that
some take more care than others. We may just have a lot of 10,000 MV-89’s
that got nuked and now are forever floating around the w
Bob wrote:
I've always found that building in performance / reliability is a
lot cheaper than testing it in...
And if you are a surplus dealer, letting the customer test it for you
is a lot cheaper than testing it yourself
One of the defective MV89s I received ("guaranteed 100% tested a
Hi
I guess it comes down to what you expect from each level of the process. Each
of us
may expect something different. Toss in language barriers and things can get
even more
confused. Watching the commercials on TV can easily lead you to expectations
that may not
be met :)
-
These bas
The fuses in the 10811 are NOT soldered in.
The leads are inserted into single pin "sockets"
Cheers!
Corby
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and follow the in
Hi,
I have come across a few 10811 oscillators over the years that had an HP
sticker on them stating "upgraded to 3010A"
Anybody know what this entails?
Thanks,
Corby Dawson
Weight Loss Program
Best Weight Loss Program - Click Here!
h
You need to understand that there is a +6.2V Zener diode reference
connected to the cathode of the varactor. If you really want to
minimize any perturbations of the oscillator by the tuning diode,
you should operate up near +5V, so that the voltage across
the varactor is minimized. Also, ideally,
What is the current requirement for the 10811 EFC +/- 5Vdc ?
Is there any advantage to having it served by batteries?
Chris
w0ep
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Hi Chad,
the sketch you sent seems to indirectly answer my question, as I could rely on
the axis of minimum "g" sensitivity to orient my three 10811 assemblies, but
for my purpose it seems that there is still a margin of ambiguity. I don't take
from the sketch how the crystal is actually fitte
iov...@inwind.it
> Subject: Re: [time-nuts] 10811 crystal orientation
> To: "time-nuts"
> Date: Wednesday, 8 July, 2009, 7:01 PM
> Hi Chad,
>
> the sketch you sent seems to indirectly answer my question,
> as I could rely on the axis of minimum "g" sensitivity to
tp://www.realhamradio.com/GPS-oven-journey.htm for
> internal pictures.
> The crystal element is a disc mounted parallel to the flat end of the can,
> see http://www.bliley.com/index_088.htm
>
> Robert G8RPI.
>
> --- On Wed, 8/7/09, iov...@inwind.it wrote:
>
> > Fr
Remember that the SC cut is doubly rotated, so the crystallographic
axes are tilted relative to plane of the blank. These angles are
published in papers on the SC cut and controlled to extremely tight
tolerances (a few seconds of arc). However, the 10811 crystal
package is free to rotate to any r
of the can,
> > see http://www.bliley.com/index_088.htm
> >
> > Robert G8RPI.
> >
> > --- On Wed, 8/7/09, iov...@inwind.it wrote:
> >
> > > From: iov...@inwind.it
> > > Subject: Re: [time-nuts] 10811 crystal orientation
> > > To: &qu
his group.
>>
>> Thank you.
>>
>> Jim
>>
>> 2009/7/9 Robert Atkinson
>>
>>
>>> Hi Antonio,
>>> Have a look at http://www.realhamradio.com/GPS-oven-journey.htm for
>>> internal pictures.
>>> The crystal element
On Wed, Jul 8, 2009 at 10:27 AM, iov...@inwind.it
wrote:
> Dear all,
>
> does anybody out there know the orientation of the crystal faces
> relative
> to the outer case in a 10811-60111?
>
> (The sense of the question is that we are considering building a 3-axis
> apparatus for gravity-relate
I think several of us have an HP document on-line that explains at least
a bunch of the various models. My copy is at
http://www.febo.com/pages/hp10811/HP10811-Specs.pdf
John
Dave M said the following on 07/08/2009 08:02 PM:
On Wed, Jul 8, 2009 at 10:27 AM, iov...@inwind.it
wrote:
> D
> Hi Antonio,
> > > Have a look at http://www.realhamradio.com/GPS-oven-journey.htm for
> > > internal pictures.
> > > The crystal element is a disc mounted parallel to the flat end of the
> can,
> > > see http://www.bliley.com/index_088.htm
> > >
> > >
eyman wrote:
> >
> >
> >> All,
> >>
> >> Can you please follow John's instructions and stay on topic.
> >>
> >> All this new age pseudo-science talk of "crystal orientations" and "g
> >> sensitivity" does not b
t;
>>>
>>>
>>>> All,
>>>>
>>>> Can you please follow John's instructions and stay on topic.
>>>>
>>>> All this new age pseudo-science talk of "crystal orientations" and "g
>>>> sens
Hi
I think that if you dig into it, you will find that there is a
polarized light process to orient the blank before the base plate is
applied.
Unfortunately for the discussion at hand, the direction of maximum G
sensitivity is still random relative to the mount.
Bob
KB8TQ
On Jul 8, 20
I certainly posted to thaqt thread several times.
However, I just remembered that about 10 or 15 years ago, I was really
stupid and split the female threaded boss on the bottom of a GPS antenna
by putting a layer ot two of Tellon tape onto a Male PVC fitting. That
'lubricated' the joint enough tha
,
> >>> maybe that is why it is called "Timenuts" list ? A place for Bruce to
> >>> drive you
> >>> "nuts" time and time again.
> >>>
> >>> Who would have thought ?
> >>>
> >>> BillWB6BNQ
> &
.> Date: Wed, 08 Jul 2009 20:05:54 -0400
From: John Ackermann N8UR
Subject: Re: [time-nuts] 10811 crystal orientation
To: Discussion of precise time and frequency measurement
Message-ID: <4a553462.8010...@febo.com>
Content-Type: text/plain; charset=us-ascii; format=flowed
I think s
Of WB6BNQ
> Sent: Wednesday, July 08, 2009 5:49 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 10811 crystal orientation
>
>
> Hi Bruce,
>
> Well, I am glad you are not mad at me.
>
> As you know most humor is fact based and such i
I have another reading key.
When the manufacturer publishes the specs of its crystals, it
alrady took into account all of the possible known variables,
some of them very tiny such as dependences on orientation
(which do exist), so freeing the assembler (and the end-user)
from caring of.
(Anyway,
iov...@inwind.it wrote:
I have another reading key.
When the manufacturer publishes the specs of its crystals, it
alrady took into account all of the possible known variables,
some of them very tiny such as dependences on orientation
(which do exist), so freeing the assembler (and the end-user)
I have seen one instance where crystal orientation does matter. Among
other things, I'm interested in WW II military radios. Admittedly long
ago.
The Canadian Wireless Set 19, the standard radio for many tanks, etc., in
WW II had an external crystal calibrator. It put out 1 MHz, 100 KHz, and
10 KH
Bob Camp wrote:
Hi
I think that if you dig into it, you will find that there is a polarized
light process to orient the blank before the base plate is applied.
Unfortunately for the discussion at hand, the direction of maximum G
sensitivity is still random relative to the mount.
Bob
KB8T
Richard (Rick) Karlquist wrote:
Bob Camp wrote:
Hi
I think that if you dig into it, you will find that there is a
polarized light process to orient the blank before the base plate is
applied.
Unfortunately for the discussion at hand, the direction of maximum G
sensitivity is still random
Jim,
It is very much on topic!
Rob Kimberley
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Jim Palfreyman
Sent: 08 July 2009 23:37
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 10811 crystal
; Rob Kimberley
>
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Jim Palfreyman
> Sent: 08 July 2009 23:37
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 10811 crystal orientatio
Agreed. Has anyone done the crucial experiment? establish stats, rotate
assembly, establish stats, etc? Should be able to measure at least if
there is an effect, and also if it is present, an approximate magnitude...
Don
Hi Don,
There are two rather different topics here.
One is do crystal osc
You are right, Tom, there are two mixed topics.
On the on-topic subject, instead of making tests to measure the frequency
dependence on orientation, It would be much more interesting looking at
possible ADEV dependences on orientation, particularily for small tau (the
bottom of the curve). I can
iova...@inwind\.it wrote:
> You are right, Tom, there are two mixed topics.
>
> On the on-topic subject, instead of making tests to measure the frequency
> dependence on orientation, It would be much more interesting looking at
> possible ADEV dependences on orientation, particularily for small tau
ly no reason for a change in atomic clock behavior,
however, if it is carefully shielded from this temperature pulse. Maybe we
should also check during the next Grand Conjunction just in case.
Don
- Original Message -
From:
To: "time-nuts"
Sent: Thursday, July 09, 2009 3
Ah, "never touch, bump, etc." implies that the effect of
changing the orientation of gravity is not reversible.
Or is it that returning to the original orientation undoes
the 10E9 effect but leaves a 10E12 permanent change?
I'd like to do the experiment myself, but I'm still getting
rid of stuff
Don Latham wrote:
Thanks. Tom. Glad to see the references.
I've some experience with clock time difference, as I showed an
astonishing number of years ago that the phase changes between two
clocks as measured by their respective LORAN-C signals was due to
changes in the atmospheric index of r
iov...@inwind.it wrote:
You are right, Tom, there are two mixed topics.
On the on-topic subject, instead of making tests to measure the frequency
dependence on orientation, It would be much more interesting looking at
possible ADEV dependences on orientation, particularily for small tau (the
b
The Zhou paper should be taken with a grain of salt. It does report on a
number of deviations measured during eclipses. More investigations is
needed to characterize the cause of these deviations.
Agreed. It is not uncommon for well-done experiments to
spend more time on analysis of error sourc
On Jul 9, 2009, at 11:55 AM, Magnus Danielson wrote:
Richard (Rick) Karlquist wrote:
Bob Camp wrote:
Hi
I think that if you dig into it, you will find that there is a
polarized light process to orient the blank before the base plate
is applied.
Unfortunately for the discussion at hand,
One is do crystal oscillators change frequency when they
are turned. The answer to that is yes. This gravitational
acceleration effect is rather huge, parts in ten to the 9th
or so, and anyone can see this. This is why you never
touch, bump, or move, or rotate a laboratory frequency
standard (this
Hello Tom,
this plot looks very similar to our standard double oven units. We
have our low-g option, which reduces the deviation to about 2- 3E-10
per g, they work great but do cost more than standard units..
Coincidentally they also reduce sensitivity to vibration and "tapping"
by 5x to
Hi Said & Tom,
The below url links some "low-g"-osc papers.
http://www.freqelec.com/tech_lit.html
Said, did you contemplate adding a cheap 3d-accelerometer and try to teach
your holdover algorithms use the accelerometer measurements in the same
way as your temperature measurements?
--
Hi Said & Tom,
The below url links some "low-g"-osc papers.
http://www.freqelec.com/tech_lit.html
Said, did you contemplate adding a cheap 3d-accelerometer and try to teach
your holdover algorithms use the accelerometer measurements in the same
way as your temperature measurements?
Björn,
Hello Bjoern,
that would work well for static acceleration (tilt) but for vibration
resistance the crystal must be low-g, or complexly compensated with wide loop
bandwidths such as the FEI papers describe.
Initial Calibration would also be tricky, and having an algorithm to
measure one re
Hi Said,
What GPSDO-products do compensate for tilt?
It seem like a major error source -- if the user for some reason want to
tilt a unit in holdover. It seems to be a "low hanging fruit" to attenuate
this error substantially even with a $2 MEMS accelerometer.
Once the ambitions grow -- more com
Hi
Most of the GPSDO stuff is made for fixed location use. In that case,
paying for acceleration compensation doesn't make much sense.
About the only people who try to do this stuff mobile (and have the
ability to pay) are the military.
Bob
KB8TQ
On Jul 11, 2009, at 5:55 AM, b...@lysato
measurements?
Didier
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Tom Van Baak
> Sent: Friday, July 10, 2009 5:51 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 10811 c
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