I just watched it on PBS. Nicely done recreation of your GREAT
experiment, Tom. Good to see you had a couple personal appearances, and
especially for the final results.
Looks like your SR620 counter had a hyperdrive undercarriage lighting
option. :-)
On 5/17/2016 7:50 PM, Tom Van Baak
Hi Keith
Does this version allow one to make use of the 1PPS to give accurate timing of
the PC and what timing accuracy do you expect?
Rex VK7MO
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
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etic seal,
you loose that, but most aren't, anyway.
So I just thought I'd mention this other mechanical attack method. I
think unsoldering the whole solder seal in one go and pulling it apart
without damaging the internals is a pretty difficult task.
-Rex
On 2/19/2016 9:09 AM, time...@meta
;move" and "pad"?) and probably easy to figure out, so probably fine as
it is. Just thought I would mention it.
Thanks for sharing your Mods. Nicely done. Should be helpful.
-Rex
On 12/13/2015 1:59 PM, Jörg Logemann wrote:
Rex,
I made some modifications to my article and I hope, t
If you like, I could possibly help make a more readable annotated
picture if you can provide me a higher res picture of the board. Just an
offer to help if you would consider my suggestions. I think you will see
my email in my post.
-Rex KK6MK
On 12/12/2015 4:39 PM, Jörg Logemann wrote:
H
This is somewhat time related, so...
Tomorrow is a centennial Pi Day, since the year is 15. Major local
observation times are just before 9:27 AM or PM.
3-14-15 9:26:54 or for time-nuts 9:26:53.589793... (take it as far as
you like)
Here's one Pi Day web page,
On UT+ firmware update. I don't think it is possible to update the
firmware in a UT+.
Back in 2006, time-nuts had a member, Randy Warner, who worked at
Synergy. In the message linked here
http://www.mail-archive.com/time-nuts%40febo.com/msg02684.html
He describes the firmware update as a
You left out a lot of details, like what OS your PC is running, Assuming
it is Windows XP or greater, you may be able to juggle the assigned com
port.
If you are using a USB/serial adapter, be sure it is plugged in so it
shows on the devices list.
You need to open Device Manager. One way is
TV doesn't seem to care about time sync much these days. It also depends
a lot on the path getting to you,
I get most of my TV via satellite (Dish network). The receiver I have
also can get OTA. I have happened to notice, once, that I had a local
channel on two TVs. One was receiving the
I had not realized that EIP continued to live on in a different form.
Counters even kept the same name on the front panel.
http://www.phasematrix.net/phasematrix/company/about-us
On 11/20/2014 2:40 PM, Alex Pummer wrote:
they are affordable and good:
585C/588C Frequency Counters
Here's another reference on driving 10-ish MHz square wave outputs via
digital chips.
A few years ago I hacked my HP Z3816 to covert its 4 - 19.6608 MHz
square wave outputs to be 4 more 10 MHz outputs. In the process I
reverse engineered some of what was there. I found each of these outputs
grade school level. Most of the interesting stuff was glossed over. I
was unimpressed enough that I never watched any of the following shows
after those two.
Maybe others have other opinions.
-Rex
On 10/25/2014 11:51 AM, Brooke Clarke wrote:
Hi:
I don't have TV and wonder if anyone who has PBS
On 24/09/2014 12:16 PM, Dave Martindale wrote:
Hello. Please add me to the list of people interested in the LTE-Lite eval
kits.
(I did not send a previous email, and you did not lose it - I've just been
slow in writing).
Thanks,
Dave
On Tue, Sep 23, 2014 at 8:05 PM, S. Jackson via
On 7/19/2014 6:38 PM, Richard (Rick) Karlquist wrote:
Or
another way of putting it is you do a bunch of
measurements and then construct a theory to
explain what you already know experimentally.
I like that. Or perhaps, stated another way, in the real world engineers
are just as important as
I think your story is rather incomplete. You never (to my deduction)
told us what you are plugging this into. You mention a GPSDO so I guess
that is where it is plugged while not doing what you want, but you never
mention what that GPSDO might be.
You blew off Art Sepin's reply as not
Several years ago there were a number of these showing up pretty cheap
on eBay, so I bought one. As I recall there were a couple of similar
versions with some differences so take this recollection with a grain of
salt.
I did some tracing of the internals on the one I had and found the
)
accredited laboratories.
http://www.nata.com.au/nata/
73 Rex VK7MO
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On 6/26/2014 10:45 PM, David J Taylor wrote:
Amazon UK want over $200! A Garmin GPS 18x LVC would be half the
price..
Cheers,
David
The UK Amazon listings are crazy. There's a listing of the USB version
at 35 pounds or about $60 (still pretty high) but the only serial
version listed
found Amazon a
little cheaper than eBay listings.
Serial has a PS-2-style connector but needs an adapter for connection to
PC. Connector pin-out is here...
http://www.usglobalsat.com/p-689-br-355-s4.aspx#images/product/large/689.jpg
-Rex
On 6/26/2014 1:59 PM, Tom Van Baak wrote:
David
I have a crappy Chinese-made handheld propeller anemometer. I'm not in
Europe but FWIW the output can be selected as: m/s, km/h, ft/min, knots
or mph. So, the first two of those seem to be likely metric choices.
Your method sounds interesting. Would you be willing to share any
details about
On 3/27/2014 8:47 PM, Mark Sims wrote:
Granite tends to be rather radioactive (particularly avoid the pink stuff).
Apologies before I begin...
He who holds the scintillation detector has a gamma ray-son detre.
Paranoia strikes deep
into your home it will creep
There's a man with a Geiger
at around 17:00 UTC on 7 March. The flight No on ADS-B is
slightly different and shows as MAS370 rather than MH370. Both are quoted on
Flight Radar 24 when you click on the aircraft to see its track.
http://www.flightradar24.com/7.69,100.35/6
Regards
Rex VK7MO
If you take the link in the original message (it is a youtube
presentation), the player on that page has an option to open the video
in Youtube.
Anyway, it goes here:
http://www.youtube.com/watch?v=MT2reYXPvGg
On 1/30/2014 8:30 PM, Max Robinson wrote:
Tom. Could you give us a link to the u
That listing is a bit vague about if it has a second hand. For the kind
of pulse drive that has been discussed here, it seems you would want a
definite second capability and step vs. smooth second hand drive.
I know nothing except a little web searching, but this one seems to have
the right
I think there is a slight flaw in slowing the drive to half rate. The
hour hand could then go around once in 24 hours, but the minute and
second hand movement is halved too. Rather non-intuitive to read unless
you only put on the hour hand and make a new 24-hour dial face.
On 1/20/2014 5:57
decipher).
On 1/20/2014 4:04 PM, Jim Lux wrote:
On 1/20/14 3:32 PM, Rex wrote:
That listing is a bit vague about if it has a second hand. For the kind
of pulse drive that has been discussed here, it seems you would want a
definite second capability and step vs. smooth second hand drive.
I know
This document lists that part number...
http://www.leapsecond.com/museum/10811a/90027-1.pdf
It says (I think -- in a quick scan) that it is mostly the same specs as
a 10811 D/E except a narrower EFC tuning range.
On 1/13/2014 6:19 PM, Brian, WA1ZMS wrote:
I have happened upon a pair of
The FE5680A has about ten years of history on time-nuts. The FEI webpage
bears little resemblance to most of the units that you will find. I have
never seen one with a factory separate connector for oscillator output.
Many needed both 15V and 5V to operate. Different versions have outputs
for
know and I'll correct or update.
-Rex KK6MK
On 12/4/2013 7:08 PM, Jerome Peters wrote:
Hello,
Can anybody shed some light on this particular model:
Model - SPTB-100/LN-001
Efratom part No. 703-200-11
Date Code 8609
(I have looked at K04BB's website, it has lots of other models
On 10/16/2013 8:26 PM, quartz55 wrote:
I've been searching for the small copper hardline I can use for the
feed on the gps volute (egg beater) antenna.
Can anyone steer me where to get a foot or so of the small 50 ohm
line so I can make a few antennas?
I've been searching mouser to
I wish you had learned to post a new message, rather than replying to a
previous message with an unrelated new subject.
(screws up threading displays in mail readers)
On 10/16/2013 8:26 PM, quartz55 wrote:
I've been searching for the small copper hardline I can use for the feed on the
gps
On 10/4/2013 9:41 AM, Tom Miller wrote:
Maybe someone can tell me the best way to search the time-nuts
archive. Do you need to download all the files to a common DB?
Regards,
Tom
I usually use this for time-nuts searches...
http://www.mail-archive.com/time-nuts@febo.com/info.html
of the PC.
Rex VK7MO
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Hi David
Yes I did not make myself clear but I am looking for UTC time from a GPS.
Thanks for all your references which I will work through and see how I go.
Regards Rex VK7MO
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David J
I don't think the rubidium module for these systems can be disciplined.
I think they were only intended as a backup if the XO section or GPS
failed. The XO section does discipline but I don't know the details.
I'm not sure of the model number, Lucent had several variations on the
same theme
On 7/31/2013 7:06 PM, Dr. Edward H. Currie wrote:
DW-40 is a good label goop remover ...
Does the DW stand for dyslexic writing? :-)
Pretty sure you meant WD-40 as in this link...
http://en.wikipedia.org/wiki/WD-40
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On 7/31/2013 5:42 PM, Don Latham wrote:
Xylene is availble as goof-off in paint departments.
Goof-off now seems to be a whole family of products. See...
http://www.goofoffproducts.com/
Maybe Heavy Duty Remover or power Cleaner and Degreaser might be the
best current options.
The one MDS
I suspect by gas he meant gasoline.
I don't know about what paint remover he meant but I have another
suggestion that might have worked. For cleaning label gunk off of used
test equipment I have used automotive bug and tar remover. Seems to
loosen up lots of gunk but not so strong it hurts
FWIW, it was clear as mud for me too.
Bert began with, Since joining time nuts over four years ago I have
not used a single MAX
232 chip. Two reasons MAX do not give me isolation and do generate noise
in critical applications.
From that I took that he was doing RS232 using opto
On 7/1/2013 11:59 PM, Doug Calvert wrote:
Hello,
Why do people go out of their way to avoid writing ebay on this list?
The statements are purposely written so that it is obvious that the
insert mystical phrase is ebay and not a generic auction site. What
history am I not aware of?
I dunno
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:25 PM, Rex wrote:
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On 6/17/2013 9:52 AM, Chris Albertson wrote:
Here is an even smaller version, at the same resolution.The trick is to
remove the background. Then all you have is mostly a plank sheet and a
small amount of ink that compresses very well.
What you do is adjust the contrast until you have only
On 6/13/2013 9:02 AM, J. L. Trantham wrote:
However, as a 'modern art' piece, I might have a chance. :^)
Joe
Like this?
http://www.rfcafe.com/references/electrical/images/Bob%20Pease%20Breadboard.jpg
Hmm, maybe not.
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On 5/25/2013 1:22 PM, Bob Camp wrote:
If you are going to code on a cheap PIC (the PIC16 series) you will likely need
to learn PIC assembler. All my coding on those parts was in assembly language.
They are old enough / slow enough / small RAM enough that things like C (or the
other high level
a program that outputs the PC time as a pulse on a
sound card so I can compare these on a CRO.
Regards Rex VK7MO
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PHK, the big pdf link in your sneak page is broken (gives 404). Can you
fix that for us?
P.S., while you are there you could change goory' to gory.
On 5/2/2013 5:22 AM, Poul-Henning Kamp wrote:
In message
CAPXiX5ricf=Ea0B=c2yr8ix+70srtfj9jeutkguqehh5izb...@mail.gmail.com, Stewart
Cobb
It doesn't affect the general magnitude conclusions by Bruce, but as
long as we are making corrections, my calculator seems to think
60 * 60 * 24 * 12 = 1036800 seconds in 12 days, not 1024800. That does
come out to 115.7 days for 1 sec error. Maybe the 12-day number was a typo?
-Rex
On 4
Please tell us if I am parsing the content of your message correctly
with my inserted comments.
On 3/25/2013 9:09 AM, Stan, W1LE wrote:
Hello Dave,
The problem I experienced with a Rb at 10 MHz stabilizing a AD6IW PLL
at 106.5 MHz
for a DB6NT 10 GHz G2 transverter,
I assume by stabilizing
I'm running Microsoft Windows XP Professional -- Version 5.1.2600
Service Pack 3 Build 2600.
I still get occasional notifications and update my OS with latest
changes. (Don't know how much longer that will continue.) The time on my
system updated OK and is currently correct. I haven't noticed
Do you think that the oven is working correctly? Is the DC current high
on power-up then dropping to a steady lower value after warm-up time?
My concern is that the resistors may have unsoldered themselves because
the oven ran away into an over-temp condition.
On 3/12/2013 9:55 AM, Garren
On 3/10/2013 6:10 PM, Hal Murray wrote:
r...@sonic.net said:
or if you have a beacon in range that you can find to establish your
offset.
What do you do after you determine the offset?
Do you tweak it out with a trimmer (R or C)? Or tell the software? Or do
the corrections with pencil and
probably go for that experiment. --
In reality, don't know if I ever will.
-Rex
On 3/10/2013 5:15 PM, Bob Camp wrote:
Hi
If you go with one of the better DOCXO's on eBay (spend the full $30 not $15) you
should get something that will hold 0.3 ppb for 48 hours. You would have to
do a few
their mobile microwave rigs.
-Rex, KK6MK
On 3/10/2013 7:23 AM, Jim Lux wrote:
Asking here on behalf of a friend..
With respect to portable amateur microwave operation.. you want good
close in phase noise (so you can use narrow band filters) AND good
frequency accuracy (so you can find
I looked at a copy of the 3200 manual I found a while ago. I used to
have a bunch of PTS stuff on my web pages but was asked by the company
to take it down. I think KO4BB manual pages have the same issue. Do you
have the manual?
It doesn't look like there is anything unexpected in the
If you have a pdf manual, you probably have the same one I have. When I
was looking today, I did see that the input pin numbers listed in the
table, where it describes the programming (p 29 in the one I have or p32
of the pdf), does not match SCHEMATIC, PE-1121 (figure 7 or p44 of the
pdf). I
Here is a Z3816a -- 271152849045
I don't know the seller but has lots of sales.
3816 requires no serial configuration (like 3801) and has two 10 MHz out
standard. Several years back I came up with a mod to convert the 4
19...MHz outputs to additional 10 MHz square outputs. --
Yes, this switch matrix seems intended for video signals, so 75 ohms is
the expected standard. I doubt that would be much of a problem for 50
ohm timing signals. Some of us shall see soon. BNCs may be 75 ohm
versions too, but probably not a big issue.
On 2/11/2013 6:20 PM, J. L. Trantham
Do you have the service manual? If not, get it here...
http://www.ko4bb.com/manuals/index.php?dir=05%29_GPS_Timing/Efratom
As I recall there's pretty good trouble shooting in the manual. Several
years ago I fixed an FRK-H that wouldn't lock. The crystal osc had
drifted enough that the trimmer
On 1/31/2013 12:20 AM, Bruce Griffiths wrote:
With some care its possible to make the emitter current of the shunt
transistor approximately PTAT so that, at least for small signals the
temperature dependence of the rejection is reduced significantly.
Sorry, what does PTAT mean? I'm not
On 1/9/2013 12:48 PM, Azelio Boriani wrote:
and don't forget the PM6681 (50pS)
The PM6681 was sold by Fluke/Philips. The same counter is also
occasionally seen as the Pendulum CNT-81. Additional good features:
small, light, and quiet.
On Wed, Jan 9, 2013 at 7:29 PM, Magnus
On 1/4/2013 4:48 PM, Bob Camp wrote:
Hi
As I recall the spec was:
1) Cheap
2) no phase slips on the 16 MHz relative to 10 MHz
3) Cheap
Bob
GAK!
Here is the original from TVB
What's the simplest way to generate 16 MHz from 10 MHz? This will be for
clocking a microcontroller at 16 MHz
On 1/3/2013 6:22 PM, David wrote:
Alternatively if you just want to divide by
5 or some other small fixed number, you can use a couple of flip-flips
and gates.
Flip-flips are good for digitally implementing tick-tick clocks, right?
:-) (Use flop-flops for tock-tock.)
to locate
those two spots, that I knew I had read, about Symmetricom picking up
John's product.
On 12/20/2012 3:21 AM, Timeok wrote:
Yes Mr Rex,
I am guilty .. not all people are perfect!
best regards form Timeok
Il 2012-12-19 23:26 Rex ha scritto:
This is a sign that people can't digest all
This is a sign that people can't digest all the messages on time-nuts.
There was this...
http://www.mail-archive.com/time-nuts@febo.com/msg53586.html
(thread replies included John)
and this...
http://www.mail-archive.com/time-nuts@febo.com/msg53811.html
On 12/19/2012 1:29 PM, Didier Juges
Ha, ha. That brightened my afternoon.
On 12/19/2012 9:13 AM, J. Forster wrote:
-John
===
[Cartoon]
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and
, or a
transmittable sketch format, and what the desired output is, maybe I
could help. Contact me if you think another cook could possibly help the
broth.
-Rex in San Jose, CA
On 12/9/2012 3:20 AM, ewkeh...@aol.com wrote:
We have a choice of two dual mixers, my copy of the original NBS
, to this thread for closing to posterity searchers.
(And me.)
And, in the mean time, good luck, bon debugging.
-Rex
On 12/9/2012 8:41 AM, paul swed wrote:
Chris
TP4 is not all that helpful its a control signal.
So let me back up for a minute. What are we troubleshooting?
I was thinking band 2 was semi
I live in the San Francisco bay area. You may recall that back in 1989
we had a big earthquake that did a lot of damage.
The epicenter was near Loma Prieta, which became the name for this
earthquake. That is about 60 miles south of San Francisco, yet a lot of
the bad damage occurred there, at
that there was no way to update the
firmware outside of the factory. That is what I remember.
-Rex
On 11/7/2012 5:05 AM, Azelio Boriani wrote:
Never found an Oncore firmware file... can you point me to anyone of them?
I'm curious to see one.
On Wed, Nov 7, 2012 at 1:30 PM, Bob Campli
On 10/14/2012 10:43 PM, Ulrich Bangert wrote:
There's another telco model that has an MTI 260 oscillator, that I
think was manufactured in Korea but does not have the Samsung logo on
the front. I don't know much about that one.
I do own a Z3805 WITH the Samsung logo on the front AND WITH a MTI
Yes, 5 MHz MTI 260 in both my Z3085 and Z3816A, doubled somewhere inside
for the 10 MHz output.
On 10/15/2012 12:32 AM, Azelio Boriani wrote:
5MHz? Then it is doubled to have 10MHz at the output...
On Mon, Oct 15, 2012 at 8:17 AM, Murray Greenmandenw...@orcon.net.nzwrote:
Ulrich is right
I think these are correct...
24-pin LOPRO WRMNT
3M D-Subminiature Connector
is printed on the envelopes from Mouser.
Plug
Mouser 517-3548-100 , (3M 3458-1000)
and
Socket
Mouser 517-3549-1000 , (3M 3549-1000)
If I remember right when I ordered about a year ago, there was a problem
in the
Another serious contender in the messy but productive realm was Bob Pease.
http://www.eetimes.com/electronics-blogs/social-mania-blog/4217103/How-messy-is-your-desk-
Quite ironic that Bob died while leaving the memorial for Jim Williams.
On 9/28/2012 8:31 PM, Chris Albertson wrote:
You can guess the real question here: how good does the 10MHz
reference need to be to test real-world receivers?
Pretty sure the answer is good enough, but... Depends on the receiver
and what it is receiving.
I got interested in time-nuttyness
Per the datasheet I just found...
http://www.gigatest.net/datum/1000b-r2.pdf
it should be 5 MHz and 10 MHz. I assume the 10 MHz is from an internal
doubler.
Corby,
Another question. I just found that datasheet but nothing about the
1000A. What's the difference between A and B?
-Rex
On 9
A couple links on what Bob is referencing:
http://www.ko4bb.com/~bruce/IsolationAmplifiers.html
http://www.ke5fx.com/norton.htm
On 9/5/2012 9:46 AM, Bob Camp wrote:
Hi
There are a number of discrete transistor buffers that have very good
isolation and short term stability / phase noise
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
On 8/21/2012 1:22 PM, David wrote:
On Tue, 21 Aug 2012 10:50:43 -0600,raj_so...@agilent.com wrote:
Hello everyone,
I am new to this forum.
It looks like a lively discussion on various topics.
A colleague of mine here at Agilent pointed me to this paper entitled The Design of Low
Jitter
. In the mean time it looks like I won't be using any SVG on my
pages either.
-Rex
On 8/7/2012 11:57 PM, Hal Murray wrote:
albertson.ch...@gmail.com said:
So you are saying that SVG can't work because one example of it is broken.
Also, there are other vector formats, like Postscript and PDF
Many years back I bought a long coil of the orange cable with N
connectors on it at a flea market. Only when I got home did I notice
that vampires had been gnawing on it in many places :-(
I should have known better and spotted the holes.
I'm pretty sure I know which box holds my vampire tool
I've had a graph logging on my HP3816A in San Jose. I see one big glitch
on 7/27 ~17:00 UTC. I don't know if it unlocked, nor if it was from
something received, or some jump in my hardware. Other than that one
jump, I don't see anything unusual over the last week or so.
There must be others
Nice list. You clearly have the disease. (Where do you find the time? :-) )
I think the first, Z3810A, was meant to be Z3801A, correct?
On 6/30/2012 7:32 PM, BD Systems Inc. wrote:
In testing and loggging the Z3810A, Z3805A, Z3815A, Z3816A, 59503A, 58503B and
the 59551A GPS Receivers, all
wiki and update it if new variations or modifications are
found:
http://www.ko4bb.com/dokuwiki/doku.php
-Rex
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On 6/5/2012 5:36 AM, George Dubovsky wrote:
On (B) and (C), helices are tapered to broadband their frequency response.
Usually the pitch changes along with the diameter.
73,
geo - n4ua
I was just reading in the 3rd edition of Antenna Engineering Handbook,
that the sharp taper at the end
I took a scan through Kraus Antennas since he did much of the
definitive work on Helical antennas. In his chapter on Wave Polarization
he gives a mathematical definition of Left- and Right-circular
polarization, then quickly mentions that the IEEE definition is the
opposite. He has a footnote:
the *time* to
build or set up a system where I could get trustworthy measurements of
these *timing* quality things myself. I keep reading but never seem to
find the time to actually do it.
-Rex
On 6/3/2012 1:46 AM, saidj...@aol.com wrote:
Jerry, Chris,
it's all relative, while the Lpro may
I was at the USGS open house for a couple hours. My first time to go.
Was also my first time to see a commercial choke ring GPS antenna up
close. Was interesting to see the antenna shifted a few inches and
causing a step function on the internet screen where they where
monitoring it along
On 5/19/2012 10:22 PM, Hal Murray wrote:
Another gadget that I saw was a two color laser ranging setup. It was good
for 1 mm over 5 km. (ballpark)
I think I saw that too. Pretty old; mid-80's probably. The number
switches caught my attention. Made me try to figure out the vintage. My
guess
In line with what Bob suggests, here is one of the square wave outputs
of an HP Z3816A...
http://www.xertech.net/Projects/Z3816/Output_circ.gif
Or look at the project for context...
http://www.xertech.net/Projects/Z3816/3816_mod.html
On 5/17/2012 6:17 PM, Bob Camp wrote:
Hi
Parallel up
On 4/7/2012 5:59 PM, Mark Sims wrote:
One of the nose-bleed channels (MeTV) just showed an old 1980's Batman show...
For a time nut, you are off by at least 14 years. (1980 - 1966 = 14)
The Clock King's Crazy Crimes October 12, 1966
The Clock King Gets Crowned October 13, 1966
The ABC
On 3/24/2012 3:54 PM, Magnus Danielson wrote:
and the Hanbook of Frequency Stability Analysis
You didn't mention looking at that one. Any comments about it?
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There's also a few cars, trucks, emergency vehicles, hand-helds and
timing receivers that he didn't bother to mention at all. I suspect most
of those would be fixed by complete replacement. (If a full fix is
even possible in all situations.)
On 3/6/2012 7:37 PM, saidj...@aol.com wrote:
I'm
John,
I agree with what you have said about the markets causing bad effects on
society because the focus is all short-term, but you are talking about
effects on the human time scale. HFT is orders of magnitude faster and
more insane.
I saved two links from after the time of the 2010 flash
The Efrotoms (FRS-C. Lpro) find the lock by modulating the microwave
frequency with an audio signal (127 Hz if I remember right) which causes
the light sense modulated signal to double in frequency when centered on
the hyperfine frequency. See the manuals for nice description. The 5680A
seems
but additionally
was not an exact copy from PTS documents.
C'est la vie. Ob-La-Di, Ob-La-Da.
-Rex, KK6MK
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The pin-outs are the same on the BCD input connector, but how the
high-order controls map differs between models.
For example, the PTS-160 doesn't use the 4-bits for 100 MHz, but rather
takes input on the 10 MHz bits up to a value of 16. The PTS-250 does use
the 100 MHz bits, with values of
that helps the OP's quests.
-Rex
On 2/9/2012 5:45 PM, Joseph Gray wrote:
I don't have any PTS gear, but the Internet Archive has this old page:
http://web.archive.org/web/20080821140147/http://www.xertech.net/Tech/PTS.html
And a quick Google turned up these links:
http://w8bl.com/page/5
http
share HP's (now Agilent) openness about sharing
documents.
-Rex, KK6MK
On 2/8/2012 2:57 PM, gandal...@aol.com wrote:
I still haven't had time yet to try your remote interface, which I suspect
others here might also find very interesting, but I have completed the
scans of my X10 and PTS250
Good image.
So, if I read that right it is a pulse about 1 uS wide and goes from
base of zero volts to about 5.8 V.
Curious why the high level is over 5 V? Is your 5 V supply to the
Rubidium unit up there?
On 2/3/2012 8:52 PM, Bob Bownes wrote:
Just for completeness sake, here is a
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