Hi Scott,
a cool thing to try is to put the unit into manual holdover by issuing the
command
sync:holdover:init
The unit will act as if the GPS antenna has been removed, but GPSCon will
continue to show the 1PPS phase drift against GPS. Thus you can see how
stable your LPRO is over
Hi
Pretty much all Rb's tune by changing the magnetic field.
Bob
On Jul 28, 2010, at 12:52 AM, saidj...@aol.com wrote:
Hi Scott,
yes, Rb's tend to have many orders of magnitude smaller control ranges than
OCXO's, so it takes longer to phase lock. What's even worse is hysterisis,
eg.
Said,
I would like to take advantage of the Fury TempCo capabilities when using an
Rb. I have been looking for the thru-hole pad which you say is next to C67 but
I can't find a C67. Consider that I am over 60 and eyesight is challenged but I
have found C68 with nearby pads. Can you give us
Hi
I know I am repeating my self but reading Brian's experience with a FRS and
the Shera controller, here I go again. Not having any luck contacting
Brooks Shera, I did fool the controller with hardware changes and have very
good results controlling a FRK-H. Comparing it with a Cesium, it is
In a message dated 28/07/2010 18:10:18 GMT Daylight Time, ewkeh...@aol.com
writes:
How ever
a Tbolt is a timing device and most of us have no ability or info to
change it to a frequency device.
Hi Bert
Is it possible you're confusing the Thunderbolt with
Hi Don,
sorry about the hassle, please see the attached image of a Fury GPSDO PCB.
C67 is on the bottom side of the PCB. The hole is one of the five mounting
holes of the OCXO, close to the edge of the PCB, next to one of the SMA
connectors. I drew a white circle around it.
You can
Hi Bob,
do we know the resolution of that change for different Rb units?
Ergo, will a say 10 microvolt change in EFC voltage actually make a
difference in the output frequency or be lost in hysterisis?
Thanks,
Said
In a message dated 7/28/2010 04:23:34 Pacific Daylight Time,
Bert,
I for one, would be interested in that.
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What could you help with? Bert
In a message dated 7/28/2010 3:05:26 P.M. Eastern Daylight Time,
wpxs...@gmail.com writes:
Bert,
I for one, would be interested in that.
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Instead of copying the Shera controller albeit with higher resolution
its probably more cost effective to choose a microprocessor with built
in time stamping capability.
The PIC24FJ128GA for example allows 30ns timestamping resolution via its
external timer capture inputs.
Other microprocessors
In message 4c5092fa.2030...@xtra.co.nz, Bruce Griffiths writes:
Instead of copying the Shera controller albeit with higher resolution
its probably more cost effective to choose a microprocessor with built
in time stamping capability.
Uhm, isn't this exactly where you want to use the
Yes, you are absolutely right and I have tried to get Richard to do it.
Bert
In a message dated 7/28/2010 4:47:46 P.M. Eastern Daylight Time,
p...@phk.freebsd.dk writes:
In message 4c5092fa.2030...@xtra.co.nz, Bruce Griffiths writes:
Instead of copying the Shera controller albeit with
One more comment $ 40 would cover every thing including PC board, May go up
to 50 depending what D/A you use. Bert
In a message dated 7/28/2010 4:47:46 P.M. Eastern Daylight Time,
p...@phk.freebsd.dk writes:
In message 4c5092fa.2030...@xtra.co.nz, Bruce Griffiths writes:
Instead of
ewkeh...@aol.com wrote:
One more comment $ 40 would cover every thing including PC board, May go up
to 50 depending what D/A you use. Bert
In a message dated 7/28/2010 4:47:46 P.M. Eastern Daylight Time,
p...@phk.freebsd.dk writes:
In message4c5092fa.2030...@xtra.co.nz, Bruce Griffiths
Nigel
I do not think so. Early on I did try a Tbolt and did run a comparison with
my Cesium, maybe I did something wrong, but to me it looked like they
where changing the OCXO frequency to correct timing. I got rid of it and
instead modified my Shera for Rubidium.
Any comments out there
Full circle back to the software, the number of units sold, the cost per hour
and time to complete project would determine the software cost. Would not
surprise me if the software would be the biggest expense till you break the
1000
unit mark unless the cost per hour was very low. As a
I assume that some one will donate their time end effort like I am
presently doing on the Dual Mixer I have spend in excess of $1000 on the
project
and untold hours and do not expect any payback. I thought that is what
time-nuts is all about.
Bert Kehren
In a message dated 7/28/2010
Paul,
Interesting you should point this out as the PICTIC was a spin-off
of a 5-year effort to modernize the Shera controller for my own use.
The 42ns TIC in the Shera was a weak point and a different TIC with
higher resolution was needed if sawtooth correction was desired.
My GPSMAX controller
FYI,
The TS272/TS274 have a slew rate of 5.5v/us at unity gain, the max
voltage on the cap is 2.7v in the new design, and the voltage is read
10us after sample complete, so the buffer should have time to
stabilize after the sample before being read.
Richard
Bruce wrote:
Not really its both
Bert,
In discussions with Brooks Shera the approach we are contemplating
is an interpolating TIC and 0-5v output add-on board for use with
his controller board. Minor modifications to the AA engineering
board will route the XO to an interpolating front end and route the
outputs back to the
Hi,
I am very slowly putting together a LPRO with a thermal bootstrap
temperature control and clean power supplies (in a separate box).
The LPRO is on a 1/4 inch aluminium plate with fins on the other
side. The LPRO and plate are in a foam plastic insulation jacket.
A small brushless DC fan
After about 19hours of holdover, only ~45ns. Now let's see how well it
recovers.
Scott
On 07/28/2010 01:02 AM, saidj...@aol.com wrote:
Hi Scott,
a cool thing to try is to put the unit into manual holdover by issuing the
command
sync:holdover:init
The unit will act as if the
Please, for two pieces, how do I pay , for France ?
Thanks
Bernard.
- Original Message -
From: Stanley Reynolds stanley_reyno...@yahoo.com
To: time-nuts@febo.com
Sent: Wednesday, July 21, 2010 12:08 AM
Subject: [time-nuts] Pictic II boards are here !
Paypal to
Hi
I think there are some significant hurdles to overcome with a TBolt directly
driving a Rb. The
TBolt assumes it can pull the oscillator pretty far in order to align the pps
signals. It also looks like the internal math may not be very happy with Rb
sensitivities. I think better results
Greetings to the timekeepers. I have enjoyed many of the comments on this
list over the past few years.
I have a HP 5335A counter with Option 040. I have found info on options 10,
20 and 30. Can anyone on the list provide any info on option 040?
Thanks in advance.
Gordon
Thankyou to all those who responded to my question...Don.
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That's an average accuracy of 6.6E-013 over 19 hours.
Impressive.
bye,
Said
In a message dated 7/28/2010 18:21:12 Pacific Daylight Time, sm...@intt.net
writes:
After about 19hours of holdover, only ~45ns. Now let's see how well it
recovers.
Scott
On 07/28/2010 01:02 AM,
Recovery from holdover was fine as well.
Scott
On 07/28/2010 11:21 PM, saidj...@aol.com wrote:
That's an average accuracy of 6.6E-013 over 19 hours.
Impressive.
bye,
Said
In a message dated 7/28/2010 18:21:12 Pacific Daylight Time, sm...@intt.net
writes:
After about 19hours of
From a 1993 HP Catalog:
HP5335A Option 40
Expanded HP-IB Control
Adds remote selection of low-pass filter, ac/dc coupling, attenuator, dc
triggering level, and input impedance for Channels A and B.
On 7/28/2010 7:24 PM, Gordon Batey wrote:
Greetings to the timekeepers. I have enjoyed
And two extra buttons in the group on the right (now 8 total there).
John Allen
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Rex
Sent: Thursday, July 29, 2010 1:06 AM
To: gpba...@compuserve.com; Discussion of precise time and
The manual on the Agilent site (preliminary) doesn't mention 040, but the later
manual (available from Artekmedia) does.
John Allen
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Gordon Batey
Sent: Wednesday, July 28, 2010 10:24 PM
stanley_reyno...@yahoo.com said:
Full circle back to the software, the number of units sold, the cost per
hour and time to complete project would determine the software cost. Would
not surprise me if the software would be the biggest expense till you break
the 1000 unit mark unless the cost
Ok guys, it has been sitting on my floor far too long and I don't know
when I'll get around to working on it. When I last messed with it, I
went through quite a few of the performance tests and IIRC, most
passed. It measures frequency ok, but it's off a bit on TI
measurements. I intended to open
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