I believe Corby came up with the bulb "rejuvenation".
If you tried to get a new bulb for a FRK, they wanted $400 in the late
1990s for them.
Several rubidium's are plentiful and cheap, it may be easier to buy one
from the auction site.
I have a HP5065A, I run it when I need it, and when not
the modifications required.
Brian Kirby
KD4FM
On 11/13/2012 5:57 AM, Bob Camp wrote:
Hi
There are a *lot* of places that archive this list. As long as you know roughly when the
messages came through, it's not to hard to go dig them up. That's also a good reason to
keep things "
http://www.realhamradio.com/tac32-interface.htm
Brian Kirby KD4FM
On 11/12/2012 7:53 PM, Merv Thomas wrote:
Hi - Thanks to all for the helpful hints which may enable me to use
Tac32. Sorry for a new posting but I had a calamity and somehow
deleted all the replies instead of moving them to my
I would measure the counter both ways to characterize it, and you may
learn a little more about how it reacts.
Use its internal oscillator for the counter, apply the same 1PPS signal
to both inputs.
Use an external time base for the counter, apply the same 1 PPS to both
inputs - make sure th
A good general purpose reference on GPS surveying is
http://140.194.76.129/publications/eng-manuals/em1110-1-1003/toc.htm
Title: * Engineering and Design - NAVSTAR Global Positioning System
Surveying *
*by the Army Corp of Engineering. Full manual is 20 Mb.
*On 12/6/2010 1:06 AM, Rob Kimbe
, check the electrolytics on the oven controller board.
You
don't want an oven controller failure.
-- john, KE5FX
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Brian Kirby
Sent: Thursday, October 28, 2010 9:15 PM
To: precise tim
I recently had a long term power failure and ran out of UPS time. The
power was out over a day and when I returned home, it had been restored.
The rubidium recovered, I hit the logic reset button and start and got
the green light.
I made some meter readings, and noticed something I have not
I had a problem with a Z3801A GPSDO. I added a backup battery to the
Motorola Oncore VP receiver, so it could store GPS satellite almanacs
(makes the unit come up a lot faster from an unpowered state). I used
common 1.5 volt AA alkaline batteries, two in series to the receiver.
Worked great.
, d is diameter, wave is the operating frequency
On 10/8/2010 9:47 PM, jimlux wrote:
Brian Kirby wrote:
20 log(base10) (diameter in meters) + 20log(frequency in ghz) +17.8 = dbi
That assumes some nominal efficiency?
I'll have to remember that one.. 17.8
It's like the 32.44 dB for
20 log(base10) (diameter in meters) + 20log(frequency in ghz) +17.8 = dbi
On 10/8/2010 8:39 PM, jimlux wrote:
Magnus Danielson wrote:
On 10/08/2010 08:22 PM, jimlux wrote:
B
You might do just as well with a flat cookie sheet.
Well, a 1 m dish gives you 48 dB gain at L1 if I calculate cor
The original Shera GPS controller was designed for the HP10811
oscillator in their frequency counter.
Brooks Shera, W5OJM, A GPS-Base Frequency Standard
On 10/3/2010 5:45 PM, Perry Sandeen wrote:
List
The HP 10811 type oscillator is used for both the HP 5370B TIC, the HP 3586B
SLV with the h
You can add a 1 K pot directly to the I/O connector on the FRS rubidium.
Top of pot to pin 8, center of pot to pin 2, bottom of pot to pin 3.
When the external pot is used, it will override the internal pot
somewhat. The pot should be a 10 turn pot.
More information is available in the Efrat
You might consider contacting Dr. Ken Kuhn -- kennathak...@gmail.com
check his HP museum at http://www.kennethkuhn.com/hpmuseum/
Brian Kirby KD4FM
On 10/1/2010 5:34 PM, ziggy9 wrote:
Fellow time-nuts:
I've got a circa 1964 DY-5842 VLF receiver. This is (was) operated in
conjunction
And ALAVAR
http://www.alamath.com/index.php?option=com_content&task=view&id=12&Itemid=30
And PLOTTER http://ulrich-bangert.de/html/downloads.html
On 9/29/2010 11:18 AM, Martyn Smith wrote:
Hello,
Can anyone recommend software to calulate the Allan varaince from a set
of data?
I have taken
I believe the primary reasons for GPS receivers for the power industry
is power line fault location. They use time tagging to measure
disturbances to locate a fault and it's accuracy directly determines its
resolution.
On 9/11/2010 7:33 PM, jimlux wrote:
Stan, W1LE wrote:
If the odd harmoni
Back when I worked with cryo-LNA's, we had helium for the cryo's and
nitrogen for the waveguide (to pressurize it). The cryo's were located
in a tropical environment and we had to add helium every day.
Then you get a new person, who comes back and ask if they were suppose
to use the pink bott
One of mine is at 26334, the other at 29827. One jumps every once in a
while the other seems to be OK.
TVB/Leapsecond.com has 13 of the units, maybe he will chime in, or you
can send him and email.
Brian
On 8/28/2010 6:31 PM, Bill Hawkins wrote:
Have a pair of Z3801a receivers and GPSCon.
I read its hard to get a position fix over the poles of the earth - its
related to the orbits of the GPS satellites. But to get time, you
really only need one satellite.
On 8/28/2010 6:31 PM, Bill Hawkins wrote:
I'm involved with time synchronization of control system
computers for multi-
We'll good luck and happy trails...In respect for John Ackermann's work
and the TAPR list that time-nuts originated from, you should be
considerate and pick a different name.
Brian Kirby - KD4FM
On 8/24/2010 9:43 PM, Stanley Reynolds wrote:
Personal Preference, Restrictions wit
Whats the reason and motive for this ?
On 8/24/2010 8:50 PM, Stanley Reynolds wrote:
Started setting up a time-nuts board at:
http://forums.n4iqt.com/modules.php?name=Forums
Need ideas for topics.
Stanley
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Fair Radio Sales have these units at a consistent price...Look on the
test equipment page for frequency counters - I believe they are at the
bottom of the page.
Brian - KD4FM
On 8/18/2010 3:19 PM, Bob Bownes wrote:
At risk of giving up a secret source, I've just discovered that if you
buy an
In Plotter, use the SERIES menu/dropdown to scale the data.
As an example for DMTD, I have to multiply the data times 1e-6:
Gave the new data a name, in the top of the dropdown, then in this case,
enter this formula, in the bottom of the dropdown;
X1*1e-6
where X1 is the data
WHen it gets t
I do not have a 5335A, but...
I use a ProLogix USB-GPIB adapter on a HP5370. I am not doing anything
fancy, no real controlling. I set the GPIB on the 5370B to talk, then
use John Miles GPIB Configuration program for the adapter. John KE5FX
is on this list and has a web site with several GP
Have you tried entering the position data manually ?
GPS:POS N,DD,MM,SS,W,DD,MM,SS,ALT
altitude in meters
On 8/1/2010 2:04 PM, Bob Camp wrote:
Hi
What's the current thinking on saving the survey position on a z3805? Each time
mine power cycle they come back believing they are in Korea somewh
Have you looked at using the TAC32 software?. You can use the 53131A
with it and a GPS receiver and time tag data and log the time interval.
You can tell it to record a one second file, and a average file, for
what ever you set the 53131A up to average, and it will also generate a
satellite s
I also noticed on the Fury I had the original firmware in the unit from
when I was bought (Oct 14,2007). I have not had a chance to play with
the unit unit recently.
I reflashed the unit with 1.22 firmware. I noticed in the flash
software I could not select the DEVICE LCP2136, it was grey
That part I understand (your drawing), its a basic phase lock loop.
What I am having trouble with is the Fury's commands relationship.
The Fury controller has the following SERVO commands to set up the loop:
SERVo:DACG which is the DAC gain, a control voltage range ?
range is 0.1 to 10,000 -- t
I read the article on PID on Wikipedia last night. I do not fully
understand it, but I see/learning some of the relationship.
I did a test on the FRS-C rubidium. The average frequency was 10 000
000.0025 hertz at the rubidium 10 turn dial dial setting of 255, and the
control voltage out of t
Has anybody on the list interfaced a Fury GPS controller to a rubidium ?
If you have, please advise the rubidium are using and your SERV:DACG ,
SERV:EFCS , and SERV:EFCD settings.
I am working with a FRS-C at the moment and I have not found the right
combination to get a stable lock.
Thanks
Looks like just what you need 32 to 55 db of gain (must have a hidden
pot somewhere)
does not require ground plane (maybe thats why 55 db of gain needed ?)
"Calibrated GPS Signal Search Parameters" . vs "uncalibrated" ?
Michael Baker wrote:
Time Nutters--
See:
< http://tinyurl.c
Robert Benward wrote:
Hi All,
How does one measure allan deviation? How does my computer measure the
stability of an oscillator? Is this coming from the Z3801A?
Thanks,
Bob
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One time did 0.8 , 1.0 and 1.2 at 100 seconds and did not see much change.
Its in the works one day to play with it some more, when I have more
TIME
Brian
Peter Vince wrote:
Have you played with the damping factor Brian?
Peter
___
time-nut
I changed the disciplining time constant on my Thunderbolts and you can
improve it (over the 100 second default). I changed it to 200 sec, then
ran a day, the 300 sec, ran another day, etc.
One unit was best at 400 seconds, the other unit at 600 seconds. What
you should see is less movement
]on
Behalf Of Brian Kirby
Sent: Sunday, June 06, 2010 2:34 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Hot Water Electronics
Some instruments can be put in a talk only mode and you will be able to
log the data. Its a "dumb" mode, but it works.
Some instruments can be put in a talk only mode and you will be able to
log the data. Its a "dumb" mode, but it works. If all you need is the
dataits good enough.
I do not know anything about the PIC Plot device, no endorsement implied.
Brian - KD4FM
Joseph Gray wrote:
I had seen that
Awesome - and - simplicity strikes again
Richard H McCorkle wrote:
Time-Nuts,
There has been much discussion on this list about methods
of measuring short-term stability. I wanted to make the
list aware of a new paper describing a small DMTD system.
The system was developed by William Riley
I do not know if this is what your looking for,
http://www.nist.gov/physlab/div847/grp40/gpsarchive.cfm
follow the directions on the date
You can look at individual SVN performance, etc.
Bob Camp wrote:
Hi
In this paper:
TOTAL HADAMARD VARIANCE: APPLICATION TO CLOCK STEERING BY KALMAN F
The Z3801A used a 6 channel version of the Motorola Oncore VP receiver.
Manual is at http://www.ko4bb.com/Manuals/05)_GPS_Timing/OncoreVPZ.pdf
Robert Benward wrote:
Hi,
Does anyone have the pinouts for the Motorola GPS within the Z3801A? It's a
ten pin header and I would like to intercept the
You may contact Synergy and see if they can flash your current receiver.
If not, they use to also have used/return receivers available.
normn3...@stny.rr.com wrote:
Said,
Thanks!! I found that after a while fishing around in the manual. Synergy used
to be able to flash the M12+t to an a posit
I would doubt it. Even though the frequencies are the same, each
satellite and WAAS satellite has a separate PRN code and your receiver
has to lock up on it. The elder Motorola Oncore VP gps receiver thats in
the Z3801A will ignore all WAAS signals.
Joseph Gray wrote:
Did anyone else loose G
"By the way, my new email is kilodelta4foxm...@topeka.com.."
Brian KD4FM
Tom Holmes, N8ZM wrote:
Brilliant!
If we found a warehouse full of Unobtainium, would we have to change its
name to Readiliobtainium? Or Notsorarium?
Regards,
Tom Holmes, N8ZM
Tipp City, OH
EM79xx
-Origin
I uploaded the 10514 and 10534 mixer manuals to ko4bb site
Bruce Griffiths wrote:
Upload it to the manuals section of Didier's site:
http://www.ko4bb.com/cgi-bin/manuals.pl
Bruce
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The manual is about a megabyte - the list will not accept it.
ewkeh...@aol.com wrote:
Is there a way you can post it on time-nuts?
Thank you
Bert Kehren
In a message dated 3/30/2010 9:10:19 P.M. Eastern Daylight Time,
kilodelta4foxm...@gmail.com writes:
We'll the "A"s are the package w
We'll the "A"s are the package with the BNC connector.
The "B"s are for OEM equipment, they had 6 pins and a smaller plastic
black case
Turns out they have some of the lowest phase noise specs on record
I can send the manual, if you like...
Brian
Mike Feher wrote:
I do not believe
Bob
On Mar 30, 2010, at 7:55 PM, Brian Kirby wrote:
Here's a block/schematic of the last version I reported on last night.
Brian Kirby - KD4FM - Guntersville, Alabama
ewkeh...@aol.com wrote:
Good morning Brian.
What do you use as an OFF SET oscillator?
Thank
. Normally the fastest edge
happens into a capacitive load at RF that's below about 0.5 J ohms
for a "50 ohm" mixer.
>
> Bob
>
> On Mar 29, 2010, at 10:06 PM, Brian Kirby wrote:
>
>
>> I have been working on a
uot; mixer.
Bob
On Mar 29, 2010, at 10:06 PM, Brian Kirby wrote:
I have been working on a Dual-Mixer Time Difference system. In the first "design
type/experiment", I was using HP10514B mixers and a LT1037 preamp and a OP27 zero
crossing amplifier/limiter - all a very basi
Is the "proper and correct" time reference codified as statue? (thinking of
the US) Where?
NBS Monograph 140...
Brian
Eric Fort wrote:
Hopefully the following questions will begin some discussion leading to a
better understanding of What time is and where it comes from in a civil,
legal, and e
I found a application note that shows how to make your own double
balanced mixer.
http://www.avagotech.com/docs/AV02-1100EN
Brian - KD4FM
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When I first got started using GPS timing receivers, I used direct
broadcasting satellite cable splitters. They are designed to pass DC,
and usually good to 1.5 to 2 Ghz.
If you need amplification you can also use DBS inline amplifiers - but
they need 12-18 volts to power them - so you would
What kind of GPS receiver are you using ? Most of the Motorola and
Garmin can output NEMA data,
which is comma limited ASCII. There are data sentences that show the
elevation and azimuth of the
satellite and signal strength in their arbitrary format.
You could extract the once sentence and br
I got a unit in my hand - I believe it is part of the mounting system
Brian KD4FM
Robert Atkinson wrote:
Looking at the drawings on the data sheet I think it is one of the radome/cable
clamp screws. Not sure why the hole is there though.
Robert G8RPI.
--- On Fri, 19/3/10, Hal Murray wrote:
Corby, do you think it warrants an inspection on the oven, for insurance
? Is it a hard procedure ? And what would you look for ?
I bought a 5065A last summer, at a hamfest. I had to align it at first
to get it to lock up and then I realigned it thirty days later. Its ran
non-stop since an
Chuck,
I bought a 5065A manual and did a high quality scan of it and placed it
at http://www.kennethkuhn.com/hpmuseum/scans/ - its in three parts.
Unfortunately all I had was a single page scanner - which meant some
schematics have 5 scans for each page - but I left overlap so they can
be l
If it will help, I can commit for 2 boards total. Brian Kirby - KD4FM
David C. Partridge wrote:
I now have statements of intent for 21 boards. This will result in a unit
price of about GBP20 plus shipping.
If I can get the interest level up to close to 50 boards, the unit price
comes down to
lly cost me a total of $7.95, And took
under 30 seconds to build.
That cost should be discounted because those parts had been considered
just throw away junk up until now.
ws
******
----- Original Message - From: "Brian Kirby"
To: "Discussion of precise tim
.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Brian Kirby wrote:
Dr. Clark passed on a tip that I used. Put the funnel in a microwave
oven and run it and see if the funnel warms up. If it warms up, you
do not use it. I do not know what type of plastic the funnel was
made out of; it was white
Dr. Clark passed on a tip that I used. Put the funnel in a microwave
oven and run it and see if the funnel warms up. If it warms up, you do
not use it. I do not know what type of plastic the funnel was made out
of; it was white, semi-transparent.
There were also comments about surveying and
The home made choke ring was calculated and the pie/cake pans came
close. I think somebody all ready pointed at it, but Unavco or NASA had
the dimensions to about 6 or 8 common choke ring reflectors on line.
They are aluminum cake pans - I bought them in a crafts store. They are
one inch apa
Several years back we had the discussion about choke ring antennas.
Dr Thomas Clark - retired NASA - Goddard Space Flight Center - I believe
he was head of the VLBI project - made a simple choke ring antenna with
an electrical junction box.
I made 3 sets using pie plates. I promised somebody
Here's a list of papers I have found on DMTD system designs
that have some inside details. If you know of others, please
add for future reference. Brian - KD4FM
Papers on Dual-Mixer Time-Difference systems:
Some Aspects of the Theory and Measurement of Frequency
Fluctuations in Frequency Stand
Bruce Griffiths wrote:
Brian Kirby wrote:
I got to correspond with a person at NIST today about DMTD - about
the HP 10514B Mixers. They pointed me to a application note at
http://www.thegleam.com/ke5fx/stellex/5952-8217.pdf (hey - thats one
of our time-nuts!) that shows driving the 10514
I got to correspond with a person at NIST today about DMTD - about the
HP 10514B Mixers. They pointed me to a application note at
http://www.thegleam.com/ke5fx/stellex/5952-8217.pdf (hey - thats one of
our time-nuts!) that shows driving the 10514 mixer at +13 dbm for the LO
port and 0 dbm for
0 ohm load. You
could easily drop the impedance at that point below 300 ohms. That
should give you a faster edge into the counter.
You also should check the slew rate performance of the 1037. You
don't want the op amp to be slew rate limited.
Bob
On Feb 27, 2010, at 12:41 PM, Brian K
I am in the process of designing a DMTD system. As an experiment to do
basic measurements on the chosen mixer, I used a capacitor (0.01 uF) in
series to ground with a 47 ohm metal film resistor. Where the capacitor
and resistor meets, another resistor is attached (390 ohms) that goes to
groun
Stanley Reynolds wrote:
Sorry, the page you requested was not found
- Forwarded Message
From: Stanley Reynolds
To: Discussion of precise time and frequency measurement
Sent: Thu, February 25, 2010 1:00:58 PM
Subject: Re: [time-nuts] Low noise voltage regulators
>From the :
Subject: Re: [time-nuts] Fw: Rb Oscillator - rather fundamental question
The HP 5062C is not a "Primary Standard", and that is why it is called a
"Reference" because it uses a different transition of Cesium 133
Big, Big, Big s*** eating Grin: hp 5065A Rubidium Vapor Frequency Sta
About every GPSDO and GPS Timing receiver needs to do a self survey
before you use it. It has to know where it is in the world.
I would give it a master reset and then initiate a self survey.
Software controls and shows status of these type of commands. I use to
have a Jupiter receiver but I
Good, I thought it may be failure time for the regulator or power supply.
I had heard folks talked about this(freq jump), but I never seen it.
I have another unit on line, so its no problem. And its the first time
I think I have seen it on that unit.
Brian - KD4FM
saidj...@aol.com wrote:
Hi
DMTF is used to "see" time interval info in the very "near" term, say
the 0.01 to 10 second range, with high accuracy and more measurement
complexity.
Most folks use a time interval counter and compare 1 PPS signals between
standards and references. The problem with this method is limited by
I would like to have an electronic clock to keep sidereal time. I am
planning on using a HP 59309A, which can except an external clock of
1/5/10 Mhz.
According to Wikipedia sidereal time is 23 hours 56 minutes and 4.091
seconds - a total of 86,164.091 seconds
So 86,400 seconds for a normal
I did not use the self survey mode, my antenna position was accurately
surveyed and I used those coordinates.
I just entered them on SETUP menu, scrolled to POSITION and entered the
coordinates. Pressed the SET ACCURATE position radiokey, and then saved
the segment.
Brian KD4FM
Richard W.
Does your employer offer medical insurance ? Please check to see if
they cover psychiatric care. Time-Nuts are more addictive than crack,
plus they all have obsessive compulsive disorders. Please seek medical
treatment before its two late.
Next thing you know, you'll end up with several cry
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. Extr
NEMA is ASCII, comma delimited. Basic stuff can be read with terminal
emulator.
Jim Mandaville wrote:
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)?. Search
We'll, I thought I had a copy of it in my archives, but I cannot find
it. I always used GPS Con.
As a replacement, may I suggest
http://ulrich-bangert.de/html/downloads.html program named :Z38XX
dave powis wrote:
Happy New Year to all
Following a PC crash on the shack PC, I have l
A lot of folks have contacted me off line about phase noise measurements.
Good references to start, is the HP applications notes on phase noise at
http://www.hpmemory.org/news/3048/hp3048_01.htm
A quick example is also in the rear of HP application note 301-1 Low Noise
Division of 10 Mhz Oscil
If you have a spectrum analyzer, depending on its resolution, you can
also measure the phase noise directly.
When I worked in the Satellite Communications industry, we needed up and
down converters faster than our vendor could make them. They use to go
thru a long QA process and they were ver
I read an article one time about using a solar cell to generate random
noise.
Scott Burris wrote:
I saw this USB connected hourglass for producing random numbers:
http://home.comcast.net/%7Ehourglass/
Anyone pursuing perfect randomness in the same way this group pursues
time and frequency? M
According to my Motorola notes (6/10/98), the unit is a Oncore VP,
version 10.0 firmware, with battery option, differential capability,
right angle OSX connector, and strait 10 pin I/O connector. Does not
look like it has 1 PPS capability or raw satellite data output.
Brian KD4FM
erniepe...@
We'll, if you need millisecond accuracy its OK. But if you running real
clocks - rubidium or cesium, WWV is just not good enough.
If you look around, you can pick up a OEM GPS receiver board for under
$40. You can also find cheap patch antennas for $9/10 - at TAPR. Put
the receiver in a ca
You can tune it manually. I have done it. Seen the pictures at
http://www.realhamradio.com/GPS-oven-journey.htm
Brian KD4FM.
Ed Palmer wrote:
The 10811-60158 has a higher than normal EFC tuning range and a lower
than normal aging rate. Combine these and you shouldn't need to tune
it manual
You will need a receiver to compare your references to. It appears that
LORAN will be shut off, so that leaves two services available, either
WWV 60 Khz or GPS. I do not use WWV any more, I can tell you about GPS.
To compare against GPS you will need a timing receiver, there are
several avai
Today I had to power down my equipment and reconfigure my power feeds
and UPS system to the timing station.
When I brought everything back up and let it warm up, I started
synchronizing my clocks to UTC via a HP Z3801A GPSDO. Somehow, one of
my GPS receivers, a Motorola Oncore VP, got a trash
On machines W2000 and before you added a switch in BOOT.INI "/NoSerialMice".
On XP and maybe earlier, you can go to the mouse and disable the serial
mouse.
Steve wrote:
I remember seeing a posting on this reflector in the last year or two
about how to disable the PC's serial mouse so a Thunde
1680x1050, another is 1280x1024, a laptop at 1152x864 another laptop at
1024x768.
Mark Sims wrote:
The next version of Lady Heather has support for some bigger screen sizes. Unfortunately the graphics library used cannot enter an arbitrary full screen video mode. It needs to know what the scr
I dis-agree - call me an old fart or whatever. Your points are valid
and proper logic, but every situation is just not the same.
Bonding everything is proper, but without an effective ground, lightning
will still seek a path to dissipate itself. We are taught if the ground
is not good to set
I have toyed with the idea of building a Dual Mixer Time Difference
setup for testing oscillators. I have attached a drawing I made and I
have a few areas I need to clear up.
At Point #1 on the drawing (the output of the mixers) I expect to see 20
mhz and the 100 hertz beat note. My plans we
In order to fake out some Garmin units, when using them via splitters on
a external antenna, we put 220 ohm resistors from the center of the coax
to the sheild. The splitters we used were capacitive coupled and this
work fine for the Garmins.
The Garmin units needed to see some sort of DC loa
single page on the lamp only - is all I scanned
The whole document is available at NIST time group
Brian KD4FM
J. Forster wrote:
I only see a page of descriptive text. Was there more?
-John
I have attached a low res scan of Robert J. Carpenter's paper NBS
Technical
I have attached a low res scan of Robert J. Carpenter's paper NBS
Technical Note 235, issued April 6, 1964. Its a rubidium standard that
was made for NBS. Its the technical specs on the lamp. I'm sure they
probably do it a little different now, but it should give an idea about
what went into
Others have made good comments about zones. HP and Symmeritcom made
lightning protectors for GPS, they use "N" connections - and I have
bought a couple on flea-bay for reasonable prices.
I work repairing two way radio systems, we use Polyphasor protectors and
they seem to do a good job. But
And a FYI - it was 60 hertz power here
Magnus Danielson wrote:
Poul-Henning Kamp wrote:
In message <4ab6b76d.1010...@rubidium.dyndns.org>, Magnus Danielson
writes:
Seems less likely. I was pondering if the power line frequency was
doing some nice beat frequency with the system...
1250
1)John Miles wrote:
Interesting! 500 picoseconds is a lot of drift. Can you try 74AC390s as
well?
-- john, KE5FX
Brian replies:Unfortunately, I did not use IC sockets
2)Magnus Danielson wrote:
While that may be interesting, I think we should stop here and think a
litt
Question for David Patridge:
I was looking over your design of the CMOS Frequency Divider 2,
schematic date 2008-07-10.
Have you performed a jitter test on your design ?
Brian Kirby - KD4FM
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time-nuts mailing list -- time-nuts@febo.com
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John - N8UR
On page 13; titled Initial Test -- 2; there is a documentation error in
the middle section; Integrated Circuit Installation -- 2.
"Install a MAX477 IC at IC2, IC2, IC3, IC4, IC5, IC6, IC7"
Should start with IC1.
Brian - KD4FM
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t
I have built two TADD-2's and have been using them in the timing shop.
I noticed a synchronization problem and I wanted to pass it on and see
if anybody else seen the same problems.
What I noticed is the units seem to want to sync within three discreet
values of time ; of the source. I have
I purchased a original HP 5065A manual and scanned it. The pictures,
oscilloscope pictures and some of the schematics were greyscaled to
bring out the details.
Its available at http://www.kennethkuhn.com/hpmuseum/scans/ Its in
three parts, each part being around 10 mb.
Brian - KD4FM
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I had a technician that was assigned to me when I worked at NASA who's
job was to operate a 6 axis of freedom table. This thing had 6
hydraulics arms and pumps wired to an analog computer. I believe it
could be modulated up to around 70 hertz or so and could handle several
thousand pounds. We
I have not tried setting parameters in Lady Heather, but the Trimble
Thunderbolt Monitor program has a field for this. Its under SETUP then
TIMING OUTPUTs. The first variable is PPS Offset. In my case its 128
ns, its entered as -1.280e-07.
Brian KD4FM
Gordon Batey wrote:
Greetings to all
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