Chris,
That is a big no ! What the Thunderbolt is doing is adjusting the OCXO to keep
it aligned with a known reference from the GPS system. The fact that a
microprocessor is involved is from a totally different perspective.
A microprocessor controlled XO is a non oven crystal oscillator
www.*axtal*.com/data/publ/*aging*_e.pdf
On Tue, Aug 28, 2012 at 2:32 AM, Don Latham d...@montana.com wrote:
Could you refresh me with the reference or email the paper? I'd like to
give it a read.
Don
Azelio Boriani
My starting point is the paper by Neubig on the real vs. predicted
If 5 V will not do it use a OPA 227 with a gain of 2. That is what I use as
my test rig.
Bert Kehren
In a message dated 8/27/2012 10:54:02 P.M. Eastern Daylight Time,
mspencer12...@yahoo.ca writes:
Thanks.. That seems like a good next step.
(Just to add to this, all three of the units
On 8/27/12 10:45 PM, Chris Albertson wrote:
On Mon, Aug 27, 2012 at 7:33 PM, Jim Lux jim...@earthlink.net wrote:
On 8/27/12 4:15 PM, Rick Karlquist wrote:
Several decades ago, the concept of the smart clock arose
at what was then HP. The idea was as discussed here to
characterize past
On 8/27/2012 6:15 PM, time-nuts-requ...@febo.com wrote:
I got an old Meinberg GPS, with an analogue integrating single-channel
receiver, and put at a friends appartment. Still works great, after me
convincing it about a new location. It has two time-tagging inputs, so
you can get UTC
Hi Tom,
Thanks for replying. I recently got a pair RFTGm-II-Rb and RFTGm-II-XO for
an inexpensive price (less than a T-bolt). They appear late versions but I
have not opened them up to get a version or date estimate.
I came across the manual and software for these many years ago (~2005) from
On Mon, Aug 27, 2012 at 11:45 PM, WB6BNQ wb6...@cox.net wrote:
Chris,
That is a big no ! What the Thunderbolt is doing is adjusting the OCXO to
keep
it aligned with a known reference from the GPS system. The fact that a
microprocessor is involved is from a totally different perspective.
On Tue, Aug 28, 2012 at 6:17 AM, Jim Lux jim...@earthlink.net wrote:
The MCXO has a one time calibration for frequency vs temperature that's
programmed into it (and some use *very* clever ways to measure the
temperature). The disciplining algorithms in a GPSDO are a bit smarter;
Yes,
thanks,Azelio. Neubig kindly sent the location for the references.
Another good company, like the Wenzel site.
Don
Azelio Boriani
www.*axtal*.com/data/publ/*aging*_e.pdf
On Tue, Aug 28, 2012 at 2:32 AM, Don Latham d...@montana.com wrote:
Could you refresh me with the reference or email the
Hi
6.0 to 7.0 volts is a *very* typical lamp voltage on an early LPRO.
Later production runs did something that bumped the number up to around 9
volts. I've never seen any real data showing that the 9 volt parts are
actually any better (or worse) than the 6.5 volt parts. The change could
have
Hi
I don't know that there is any data showing the TBolt adjusting for aging
during holdover. In other words: showing the holdover DAC voltage changing
at a completely constant temperature.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
I don't know that there is any data showing the TBolt adjusting for aging
during holdover. In other words: showing the holdover DAC voltage changing
at a completely constant temperature.
Bob
I haven't seen any data either but here is information from section 5.1.2
of the 2003 Thunderbolt
Hi
... then if you take a look at the status printout on a TBolt Kalman
filter always shows up as disabled. Thus the who knows what they are
doing.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Arthur Dent
Sent: Tuesday, August
The then Hughes Aircraft had a nice hybrid (microelectronic ) version of this
idea produced in Newport Beach.
--- On Mon, 8/27/12, Rick Karlquist rich...@karlquist.com wrote:
From: Rick Karlquist rich...@karlquist.com
Subject: Re: [time-nuts] HP/Agilet counter 53131A (not 53151A) trigger
I can confirm what Bob wrote.
From my log, these are the Lamp V of my 9 working LPROs:
8.25
5.18
7.74
6.54
6.5
7
6
6.5
7
The one that gives 5.18V seems to have some problem with the capacitive
trimmer near the lamp.
Antonio I8IOV
Bob wrote:
6.0 to 7.0 volts is a *very* typical lamp voltage
Antonio that cap peaks the rf. They get bad over time and cause an issue.
You may find it to be noisy/touchy and if replaced you could get a higher
rf voltage and a brighter lamp.
Regards
Paul
WB8TSL
On Tue, Aug 28, 2012 at 3:24 PM, iov...@inwind.it iov...@inwind.it wrote:
I can confirm what
From what I've seen, peaking the lamp voltage with the trimmer capacitor on
an LPro does not improve the stability. It may even get a bit worse. This
was the case on a couple of different units; I didn't investigate further.
-- john, KE5FX
www.miles.io
-Original Message-
From:
Hi guys,
The hex file is quite outdated. In 2009 I contacted Brook Shera in
order to get the source code as I wanted to build this controller and
wanted to change the PIC to use a Flash one and add some improvements.
His response was that he already had changed the microcontroler for a
Sorry, I meant Brooks Shera.
Regards,
Ignacio, EB4APL
On 28/08/2012 23:20, EB4APL wrote:
Hi guys,
The hex file is quite outdated. In 2009 I contacted Brook Shera in
order to get the source code as I wanted to build this controller and
wanted to change the PIC to use a Flash one and add
The Kalman filter referred to in the status display refers to a Kalman filter
on the position, not the one used to discipline the oscillator during
holdover. The on;y device that I have seen that implements the Kalman
position filter is one of the Resolution-T models (I don't remember if it
Now I need to find a 10 KW potentiometer!
John
--
From: Jerry jster...@att.net
Sent: Monday, August 27, 2012 8:10 PM
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Subject: Re: [time-nuts] Isotemp OCXO trimpot
Read more carefully, Bob. It was a joke based on a typo.
On 8/28/2012 5:44 PM, Bob Camp wrote:
Hi
I wouldn't go to crazy digging up a 10K pot. I suspect that anything in the 10K
to 50K range will work ok.
Bob
On Aug 28, 2012, at 8:24 PM, jmfrankejmfra...@cox.net wrote:
Now I need to
Hi:
I have been thinking about purchasing a HP5065A Rubidium Frequency Standard.
Are all of the critical parts still available for them?
What is a reasonable price for one?
What usually goes wrong with them?
Would I be better off to just purchase a SRS PRS-10?
Any ideas and
Ron
I guess with some humor the critical part the RB gas is not. :-) The srd
would be a killer also.
But pretty much everything else is very reasonable and adaptable with
modern technology.
Only spares would be ebay parts or something like that. They have been out
of production a long time.
So
Dear Ron,
Good morning. I just finished rebuilding a not so beaten 5065a. The physics
package is ok. It is one of the later units. I had to spend several weeks
working on power supplies, regulators and changing every single capacitor on
the boards for security matters as no capacitor was
Hi,
has anyone yet managed to extract and/or disassemble the eprom of an FE-5680A?
Im willing to help with disassembly/decoding if you have the binary dump.
Cheers.
--
Mike McCauley mi...@open.com.au
Open System Consultants Pty. Ltd
9 Bulbul Place Currumbin
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