2010/1/8 Poul-Henning Kamp p...@phk.freebsd.dk:
In message 4b4603e5.4050...@rubidium.dyndns.org, Magnus Danielson writes:
john.fo...@gmail.com wrote:
Now, I'm not sure what kind of testing they did, [...]
What better test of server performance as a ten-fold increase in load?
And at only
z...@dakotacom.net said:
I'm totally new to this semi-DIY gps stuff. Can anyone recommend any
NMEA packet reader software that will work on my old Windows 98
laptop (using data through the RS-232 serial)?. Searching online I
find a lot of rather expensive software that does much more than
On the original thread, I enquired who refurbished the LPRO's and what it
included. Basically it's done by the seller and is a C field adjustment and
lamp voltage check. Personally I'd call that tested and adjusted as required.
Refurbished implies to me that wear-out parts have been replaced.
That is interesting. Finally a data. Some chains might remain up then to
support Canada. At least for a bit. Russian must be in Alaska I might guess
On Thu, Jan 7, 2010 at 2:01 PM, Majdi S. Abbas m...@latt.net wrote:
Looks like they got their certification. See below.
--msa
Hi Jim,
Try Serialmon:
http://www.serialmon.com/
It has a NMEA packet decoder built in.
- John
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Jim Mandaville
Sent: Thursday, January 07, 2010 8:42 PM
To: Discussion of precise time
I was recently having trouble with one of the 54002A input pods on my
5372A. It was occasionally being recognized as a 54001A pod. I took it
apart and found that 7 of the 8 solder joints between the circuit board
and the connector at the back of the pod were bad. I checked my other
pods and
HP is NOT perfect.
I have a 5519A LaserInterferometer head which was acting up. They are
distinctly non-trivial to fix. Anyway, this one had a critical feedback
detector that had NEVER been soldered to the PCB.
Moral: Look for the simple faults first.
-John
=
I was recently
Hi
The process of properly locking the gps to the rubidium is a lot more complex
than running a simple phased lock loop and lighting a light. I would be at
least as concerned about the firmware in the device as about the gps receiver
Bob
On Jan 8, 2010, at 8:36 AM, Robert Atkinson
I have a Symmetricom 56000 Data Rate Clock. Trimble 6-sat GPS. 90K sample
position averaging allows Google maps to nail the antenna location.
Principally use it as a GPS-DO, the primary GPS-DO is a ovenized crystal
oscillator. The back-up oscillator is a rubidium FEI FE-5650 with enough
Hi Bob,
Indeed! I must admit I thought at first that the LPRO was one of unit with
built-in discipling to an external 1PPS. If this guy was selling in the UK he
would be breaking advertising rules with his claims. I can see no validity for
his claim of NIST traceability. NIST specifically say
Thats good to know the same pods are used on the 54100d scope I believe. At
least its the same concept so the same failure mechanism may be at work.
On Fri, Jan 8, 2010 at 11:08 AM, Ed Palmer ed_pal...@sasktel.net wrote:
I was recently having trouble with one of the 54002A input pods on my
Anyway to tell the age of the RB?
It may be running out though you start to see unlocks that gradually
increase in time lost.
On Fri, Jan 8, 2010 at 1:38 PM, r.tetra...@comcast.net wrote:
I have a Symmetricom 56000 Data Rate Clock. Trimble 6-sat GPS. 90K sample
position averaging allows Google
I control my lpro101 with trimble thunderbolt .
now is more then one month , work good very stable .
But I am not happy , sure long time is more stable of original
thunderbolt with ocxo , sure is more stable in holdover ( we need in
holdover ? i never lost gps signal ) .
But short time is worst
In an earlier post I mentioned that I had been searching on-line for ideas
to multiply a 10 MHz signal to 100 MHz. I would like to multiply the 10
MHz outputs of an LPRO and a Thunderbolt GPS to feed to 10 GHz phase-locked
microwave sources so their outputs can be fed to a mixer for
Alfredo,
Your results seem correct; it is true that most Rb have worse
short-term performance than a free-running OCXO. I think
2.5e-11 is about right.
How did you measure yours?
Yes, the TBolt OCXO is quite good, short-term. The ones sold
by TAPR (tested here by me, last year) are 1 or 2 to 3
Bruce Dave G4HUP (a local) has family members in the States and attends
several of the Microwave events like MUD and Dayton. I think he monitors this
group so you may get a reply eventually (we are deep in an unaccustomed snow
blanket at the moment, and as he lives a little remotely, he may
I control my lpro101 with trimble thunderbolt .
now is more then one month , work good very stable .
But I am not happy , sure long time is more stable of original
thunderbolt with ocxo , sure is more stable in holdover ( we need in
holdover ? i never lost gps signal ) .
But short time is
Hi
Simply heating the existing crystal might help things a little.
One minor note:
The VCXO in the LPRO is a 20 MHz oscillator. They divide it by 2 to get 10
MHz. They use the 20 MHz in their synthesis scheme to get to the rubidium
transition frequency.
There are a lot of 10 MHz OCXO's out
Hi Bruce,
The filter you are referring to is the Neosid 120MHz filter - it is available
from Eisch Electronik, http://www.eisch-electronic.com/
part no 511836. It is specified as 120 to 160MHz, so not sure it will go down
to 100MHz. If you wish make an enquiry with Eisch, the proprietor, Uli,
There are a lot of 10 MHz OCXO's out there that do the same crystal at
20 MHz / output at 10 MHz trick.
In the old days of TTL digital design, it was common to run the clock from
the typical osc package through a divide by 2 FF to get (much) better
symmetry. The asymmetry would always come
HI all Time-nuter,
as a complement ther is an article on a multiplier in the last French Ham
revue (RadioRef 826 nov 2009)
that describe a SHF beacon pilot from a 10MHz source.(in french)
Has someone interest?
73
Alain
F4GBC
(infos for the magazine : cont...@ref-union.org)
- Original
Robert,
Robert Atkinson wrote:
Hi Bob,
Indeed! I must admit I thought at first that the LPRO was one of unit with
built-in discipling to an external 1PPS. If this guy was selling in the UK he
would be breaking advertising rules with his claims. I can see no validity for
his claim of NIST
I do not have much familiarity with mathematics. and errors are always
behind the corner.
Please someone can confirm if ± 2E-11 at 10GHz is ± 2Hz ?
Is this correct or wrong ?
regards alfredo i5uxj
___
time-nuts mailing list --
2E-11 * 10E9 = (2*10)E(-11 + 9) = 20E-2 = 2E-1 = 0.2 Hz
On 1/8/10 4:29 PM, Dott. Alfredo Rosati alfredoros...@alice.it wrote:
I do not have much familiarity with mathematics. and errors are always
behind the corner.
Please someone can confirm if ± 2E-11 at 10GHz is ± 2Hz ?
Is this
John Miles wrote:
I control my lpro101 with trimble thunderbolt .
now is more then one month , work good very stable .
But I am not happy , sure long time is more stable of original
thunderbolt with ocxo , sure is more stable in holdover ( we need in
holdover ? i never lost gps signal ) .
But
10 GHz = 10E10 Hz x 2E-11 = 2E-1 or 0.2 Hz
73, John k1AE
John Allen - PC Support Solutions www.pcsupportsolutions.com
PC On Site Service and Training - Computer HW/SW/Network debugging,
installation and upgrades.
mailto:j...@pcsupportsolutions.com 978 779-6189 M: 508 361-6229
-Original
In a message dated 09/01/2010 01:08:06 GMT Standard Time, kc0...@yahoo.com
writes:
http://transistorclock.com/ has a very interesting (though a bit
expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200
transistors
and 600 diodes to drive six seven-segment displays.
The real touch of class is the zip tie holding the cap in place!
gandal...@aol.com wrote:
In a message dated 09/01/2010 01:08:06 GMT Standard Time, kc0...@yahoo.com
writes:
http://transistorclock.com/ has a very interesting (though a bit
expensive) kit for sale. A 10 x 11 circuit board
Even more unfortunately, that still doesn't stop it being
useless expensive crap :-(
and even THAT doesn't stop me from still wanting one... drool :)
My brother-in-law is in an electronics tech program at the local community
college. I'll have him put it together for me. I'm sure that he
this is very clear explanation / 2E-11 * 10E9 = (2*10)E(-11 +
9) = 20E-2 = 2E-1 = 0.2 Hz_
thanks very much .
now the first step is clear .
assuming a timebase at 10MHz with a short term stability of 2E-11 the
10MHz should be near 10.000.000.000. +/- 2 . ( or better floating
In a message dated 09/01/2010 01:37:39 GMT Standard Time, scot...@yahoo.com
writes:
and even THAT doesn't stop me from still wanting one... drool :)
My brother-in-law is in an electronics tech program at the local community
college. I'll have him put it together for me. I'm sure that
Hi
With the spectrum analyzer you are measuring phase noise. The 10811 is much
more quiet than the LPRO for phase noise at 1 Hz.
Phase noise and short term stability do relate to each other, but the
relationship is complex. A range of frequency components all contribute to the
short term
this is very clear explanation / 2E-11 * 10E9 = (2*10)E(-11 +
9) = 20E-2 = 2E-1 = 0.2 Hz_
thanks very much .
now the first step is clear .
assuming a timebase at 10MHz with a short term stability of 2E-11 the
10MHz should be near 10.000.000.000. +/- 2 . ( or better floating
Hi
It seems like the diode to resistor ratio is a bit off in that design.
In order to go into further detail, I would have to admit to starting out in
the pre-integrated circuit logic era
Bob
On Jan 8, 2010, at 8:07 PM, Tom Clifton wrote:
http://transistorclock.com/ has a very
Hello to the group.
For whatever reason I have resurrected a 1967 HP 5245L counter. Indeed I
have many newer units.
But there is something about that nixie tube glow.
Anyhow as good as HP is, I found interesting failures. Infact simply the
gold leads on the transistor rusted/rotted off.
That was
Hello, Time-Nuts--
Paul Swed said:
For whatever reason I have resurrected a 1967
HP 5245L counter. Indeed I have many newer units.
But there is something about that nixie tube glow.
Indeed. I have an old HP-5245L counter that I keep
running
Knowledge of history doesn't = having lived it :-)
http://www.play-hookey.com/digital/electronics/dtl_gates.html
3 to 1 is not all that odd if you have 5 to 1 and 2 to 1 ratios as the page
above indicates.
Stanley
- Original Message
From: Bob Camp li...@cq.nu
To: Discussion of
I have two fully operational HP5245L. There is something satisfying
about the glow of Nixie Tubes. And the kids like to see it counting if
you take it out of the storage mode. I also have a complete set of
spare boards - and they are not available. One of the units I have is
H48 spec.
I bought a brand new 5245 for my lab at work in about 1967. It was really
the cat's meow! I also had the parallel printer.
-John
I have two fully operational HP5245L. There is something satisfying
about the glow of Nixie Tubes. And the kids like to see it counting if
you take
I have a couple 5233 counters and I still use them.
I use two Nixie tubes to display seconds from 1PPS signal from a GPS
receiver. The one pulse per minute output from the Nixie display drives a
1930's slave or impulse clock.
John WA4WDL
--
- Original Message
From: Bob Camp li...@cq.nu
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Fri, January 8, 2010 8:10:34 PM
Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Hi
It seems like the diode to resistor ratio is a bit
At high temperatures the circuits with the additional diodes in series
with the base will have problems with transistor leakage currents when
all inputs are low.
The person who created that page doesnt know how to design reliable
circuits.
A base to emitter shunt resistor is one way of
I'm building one mostly for the nostalgia factor -- that plus it's a
good use for that roll of 1000 1N4148 diodes I won at auction!
I have just the divide by 60 down to 1Hz done. It works now that I
found that one diode I put in backwards.
Eventually I'll have to tie it to my Thunderbolt
On 1/8/2010 6:27 PM, time-nuts-requ...@febo.com wrote:
You must see it to believe it!
I won't buy one until it comes in surface mount.I *hate* flipping
PCBs over and clipping leads.
;-)
-ch
___
time-nuts mailing list --
Mike.
Do you happen to know a man named Carl Litzkow? He lives in Micanopy, or he
used to. He and I have been friends since we were in the second grade
together although we have lost touch lately.
Regards.
Max. K 4 O D S.
Email: m...@maxsmusicplace.com
Transistor site
At 9:27 PM -0500 1/8/10, paul swed wrote:
Hello to the group.
For whatever reason I have resurrected a 1967 HP 5245L counter. Indeed I
have many newer units.
But there is something about that nixie tube glow.
Anyhow as good as HP is, I found interesting failures. Infact simply the
gold leads on
Easy, make a jig, preform and cut the leads to length, solder everything
from to top side.
Or use tape-and-reel and an auto-inserter.
But, the IC-less clock is not nearly as cool as the clock that just uses neon
bulbs for the logic... don't need no stinkin' transzippers.
My dekatron counter out-cools your nixie counter...
_
Your E-mail and More On-the-Go. Get Windows Live Hotmail Free.
http://clk.atdmt.com/GBL/go/196390709/direct/01/
This makes an interesting read:
http://tycho.usno.navy.mil/ptti/1990/Vol%2022_36.pdf
73 Cheers
--
Raj, VU2ZAP
Bangalore, India.
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