, or is it
an indication that there is some underlying problem that I haven't addressed?
Perhaps the ADC in the PIC?
http://evoria.net/AE6RV/TIC/ADEV4.png
Bob
From: Bob Camp kb...@n1k.org
To: Bob Stewart b...@evoria.net
Cc: Discussion of precise time and frequency measurement
After spending a lot of effort trying to get some useful tuning figures for the
PID in my GPSDO engine, I decided to capture the DAC output with my 3456A.
And, of course I've made an ADEV plot. If I understand this correctly, it
means that there is mostly justnoise out to 2 tau, and an area
wondering if it would be better to look in the frequency domain.
I'll have to look at Tom's site to see if he has code to do that.
Bob
From: Bob Camp kb...@n1k.org
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
think. It's certainly nowhere near the noise on the
other two plots driven by the DAC.
http://evoria.net/AE6RV/TIC/Op-Amp.png
Bob
From: Bob Stewart b...@evoria.net
To: Time Nuts time-nuts@febo.com
Sent: Wednesday, September 10, 2014 10:06 PM
Subject: [time
Hi Tom,
And thank you very much for taking the time to look at this. No, I don't know
what the heck a lot of this means, and it's no surprise that I used the wrong
tool. I had noticed the first few seconds of bad data, but didn't think it
would matter over long sample sessions.
I'll take
in the one I've been posting about. So, I'm doing testing
and tuning, and will be back with still more questions. But, I'm finally
starting to get reasonable results.
Bob - AE6RV
From: Andrew Rodland and...@cleverdomain.org
To: Bob Stewart b...@evoria.net
From: Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Saturday, September 13, 2014 4:27 PM
Subject: Re: [time-nuts] Help understanding an ADEV
On 11 Sep
Offline
Tom,
Have you run the same sort of test on a LEA-6T, or do you know off the top of
your head what the std deviation is? I had naively expected it to be spot on,
but I see jumps every now and then, and I don't know whether it's something on
my end, or if that's expected.
Bob
My daughter and I were discussing what she does for a living with time and
phase as a geophysicist and relating that to what I'm trying to do with my
GPSDOengine. I explained that I was trying to keep the frequency accurate and
stable, while also keeping the phase near a target of 180 degrees.
There's also this installation note:
http://literature.cdn.keysight.com/litweb/pdf/08720-90318.pdf
Bob - AE6RV
On 09/28/2014 06:26 PM, Tom Van Baak wrote:
There were two responses to Dave's question (TCXO and OCXO) and perhaps neither
is correct. I don't have a 8720D VNA myself and Dave
Two days this week, there was a 3 or 4 minute outage on DirecTV as the sun
aligned with the satellite and my dish. So I was wondering what kind of effect
this has on the GPS system and especially timing receivers.
Bob - AE6RV
___
time-nuts mailing
time-nuts@febo.com
Cc: Bob Stewart b...@evoria.net; hmur...@megapathdsl.net
Sent: Thursday, October 9, 2014 2:27 PM
Subject: Re: [time-nuts] Sun Outage
On Thu, Oct 9, 2014 at 11:18 AM, Hal Murray hmur...@megapathdsl.net wrote:
What's the beam width of the DirectTV antennas? Does it agree
Hi Dan,
I found a picture that looks like your OCXO on Brooke Clarke's website. Maybe
he has a schematic or pinouts for the oscillator.
http://www.prc68.com/I/Images/Z3805A07b.jpg
Bob
From: d...@irtelemetrics.com d...@irtelemetrics.com
To:
Hi Dan,
Didier's site is back up and this should give you a start:
http://www.ko4bb.com/manuals/index.php?dir=05%29_GPS_Timing/Z3801/Z3801A_Schematic
Bob
From: d...@irtelemetrics.com d...@irtelemetrics.com
To: time-nuts@febo.com
Sent: Saturday, October 11,
Hi Bob Camp,
In your response to Chris, you said: Once you have it “right” you really need
to check it over a month or two to watch for GPS “once a day” issues.
Could I ask you what you meant by these once a day issues? Was this a
general comment, or was it about something specific? As you
that are DC
isolated from the antenna.
Bob
From: Bob Camp kb...@n1k.org
To: Bob Stewart b...@evoria.net
Sent: Sunday, October 19, 2014 9:01 PM
Subject: Re: [time-nuts] GPS once a day issues ?
Hi
One of the reasons you want to wide space antennas if you
, but things are
looking better than the last time I spoke about my unit.
thanks,
Bob
From: Bob Camp kb...@n1k.org
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Sunday, October 19, 2014 8:50 PM
Hi Glen,
I'm looking at this unit, but I have to say that I can't make any sense from
the listing. I don't know what the REF-0 and REF-1 units do, and I don't know
whether they need to be connected to a Z3810AS, which I don't have. Could you
or someone elaborate on exactly what these are?
Oh, duh. Sorry. I missed the relevant post. Never mind. Now I'll go feel
embarrassed for awhile.
Bob
From: Bob Stewart b...@evoria.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Monday, October 20, 2014 11:59 AM
Stu said:
Power is applied to the connector labeled +24VDC and P1, in exactly the
same way as the earlier RFTG units. Apply +24V to pin 1 and the other side of
the power supply (GND or RTN) to pin 2. In these units, that power supply goes
directly to an isolated Lucent DC/DC converter brick
Hi Tom,
One of the biggest problems I've unwittingly faces is that of retrace. I had
seen the term used several times, but hadn't looked it up until last night. As
you can imagine, with a GPSDO under development I've had to remove power more
than a few times to make hardware changes. I
OK, Yahoo has done it to me again. Sent to Tom direct and not to the list.
So, repeated here:
Hi Tom,
One of the biggest problems I've unwittingly faces is that of retrace. I
had seen the term used several times, but hadn't looked it up until last night.
As you can imagine, with a GPSDO
a better understanding of it
now. I'll try to avoid any hardware changes for the next few weeks. I may
even make changes that will keep the DAC stable when loading new code.
Thanks!
Bob
From: Said Jackson saidj...@aol.com
To: Bob Stewart b...@evoria.net
Hi Stewart,
I get my units in on Thursday and the misc to get them going on Friday. I have
a feeling it's going to be a long night of a weekend =). Looking forward to
what we can all find out about these units. They can't help but help me along
in developing my GPSDO engine.
Bob - AE6RV
My units came in today. What I got appears to be new-in-box. It's probably
the only thing I'll ever get with a blue Agilent sticker on the box. =) It
has a yellow Symmetricom notice inside the box.
The circuit board appears to be the same on both units, but that says nothing
about the
of the
boards may tell a different story.
Anthony
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob
Stewart
Sent: Thursday, October 23, 2014 12:20 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lucent KS-24361, HP
Sorry if these comments are a bit naive, but this is my first exposure to a
Z38xx.
I've got mine powered on and connected to the antenna. After referring to
Stewart's original post (once again) I've managed to download HP's SATSTAT and
get it running. When I connected to the REF-1 unit (with
is a thermal problem, so it
could all fall over sometime tonight. OTOH, the survey isn't complete, and I
have no idea about the performance of this Z3812A during survey.
And thanks for the Linux ideas.
Bob
From: Hal Murray hmur...@megapathdsl.net
To: Bob Stewart b...@evoria.net; Discussion
Regarding my comment earlier that my GPSDO and this Z3812A don't agree on
phase. I see just now a fairly quick phase movement of the phase between the
two, and I see that there is a line on the Satstat program that may explain
this: 1PPS TI +50.0 ns relative to GPS. Just a few minutes ago,
a bit
over 99 degrees F.
Bob
From: Bob Camp kb...@n1k.org
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Saturday, October 25, 2014 7:09 AM
Subject: Re: [time-nuts] Lucent KS-24361/Z3812A GPSDO initial setup
Hi
One
didn't try it, but I assume a USB dongle wired appropriately would work, as
well. As I'm out of serial ports on the server and had to turn on the laptop
to interface this, I'll probably try that experiment soon.
Bob
From: Anthony Roby ar...@antamy.com
To: Bob Stewart b...@evoria.net
is, as the OCXO ages
in.
It looks like I need to put a shelf on the wall and give this a permanent home.
At the very least, that would get it out of my way so I can do other work.
All things considered, it's a good problem to have. =)
Bob
From: Bob Camp kb...@n1k.org
To: Bob Stewart
least, this gives me a lot of information about GPSDOs that I
didn't have in the past. And there's that EFC pin-out back near the OCXO that
I could watch with my 3456A, to see what the dynamics are on a real GPSDO,
once it ages in.
Bob
From: Bob Camp kb...@n1k.org
To: Bob Stewart b
reporting the phase offset of the 10MHz to the PPS, but as you
say, I haven't measured it yet.
Bob
From: Bob Camp kb...@n1k.org
To: Bob Stewart b...@evoria.net
Cc: Time Nuts time-nuts@febo.com
Sent: Saturday, October 25, 2014 2:01 PM
Subject: Re: [time-nuts] Lucent KS-24361/Z3812A GPSDO
Hi Anthony,
Thanks for more pics. Was there any indication of where the 10MHz gets its
signal? Could you see a trace, or did I miss that in the pics? I'm a bit too
ham-fisted to go prodding around in mine, so I've left it closed after an
initial urge to see the top of the board.
Bob
Hi Bob,
The little brick says it's happy with 18-36V.
Bob
From: Bob Camp kb...@n1k.org
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sunday, October 26, 2014 10:37 PM
Subject: Re: [time-nuts] float chargers for oscillator backup power
HI
We
Hi Anthony,
Did you power cycle both units as part of connecting them together at J5 to J5?
And can you remind me whether you are using the supplied interface cable, or
are you using something else? After warmup, the ON light is on for the REF-0
unit and the STBY light is on for the REF-1
Hi Anthony,
When you ran Satstat, did you open the serial port? Click Commport-Settings
and set it 9600,8,N,1. Then click Commport-Port open. Works OK under XP for
me. I haven't tried it under Wine as I'm out of serial ports on the server and
have the laptop to use.
Bob
From:
of standby.
I am using GPSCon to monitor and it appears to work fine.
One thing on my units, when I power cycled them, it started a 'survey'
over! I didn't expect that. Are others seeing this. There must be a way
to store the surveyed position
Tnx,
Mike
On 10/30/2014 3:59 PM, Bob Stewart
Hi Bob et al,
I don't understand the direction this question about the supercap has taken.
It's connected to pin 1 of the GPS receiver. It looks to be a UT+, so that's
the battery backup power. According to my UT+ manual the current draw on this
pin is between 5uA (at 2.5V) and 100uA (at
GPSDO system
Bob Stewart bob at evoria.net
“…I have both of my units sitting on the bench. I found that I needed to
connect them together to get the REF1 unit to come out of standby….”
Bob Camp kb8tq at n1k.org
“I suspect that somebody will have to figure out what the 15 pin
connector / jumper
Didn't the clocks in cars back in the day use the same sort of thing to wind
themselves? Though I remember a single click every x minutes, not the
vibration of a solenoid.
Bob
From: Brooke Clarke bro...@pacific.net
To: Discussion of precise time and frequency measurement
Hi Ed,
This was copied by hand between two units, so there may be minor typos.
COPYRIGHT 1991-1997 MOTOROLA INC. ,SFTW P/N # 98-P36848P,SOFTWARE VER # 2
,SOFTWARE REV # 2,SOFTWARE DATE APR 24 1998,MODEL # R5122U1152,HDWR
P/N # 5 ,SERIAL # R04RMW,MANUFACTUR DATE 9C19 ,
Hi Bob,
There's also the option of the SSR-6Tr and adapter board from Synergy GPS. It
should plug right in. You'd need the Oncore compatible version. Kinda pricey
though.
Bob
From: Bob Camp kb...@n1k.org
To: gandal...@aol.com; Discussion of precise time and frequency measurement
Hi Bob,
I am only able to communicate with my system through the REF-0/slave unit. I
had thought this was normal behavior till someone, you perhaps, posted that
that was not correct. So, I've emailed Aecis to request a replacement REF-1.
Bob From: Bob Camp kb...@n1k.org
To: Discussion of
Hi Bob,
Talking on J8-Diagnostic port. All I see on the RS-422 port is a timestamp.
Bob From: Bob Camp kb...@n1k.org
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Monday, November 3, 2014 6:17 AM
Subject: Re: [time-nuts
Regarding comms through the diag ports on the two units, I was using this post
by Stewart Cobb as my reference to what works and what does not.
Bob
From: Stewart Cobb stewart.c...@gmail.com
To: time-nuts@febo.com
Sent: Sunday, November 2, 2014 3:42 AM
Subject: Re: [time-nuts] Lucent
Hi,
It's possible that my REF-1 had a software fault. I power-cycled both units,
and now I can talk to both. However, I see that there is at least one
difference. During the survey period, REF-0 mode only says SURVEY. REF-1
gives the percentage complete as shown on page 1-10 in the Z3801
Have you read Tom's story about his family trip up Mount Ranier with a Cesium
clock?
Project GREAT: General Relativity Einstein/Essen Anniversary Test
Bob
From: xaos x...@darksmile.net
To: time-nuts@febo.com
Sent: Monday, November 3, 2014 10:17 AM
Subject: Re: [time-nuts] NPR Story I
Here is a plot of the overnight ADEV I just ran comparing my GSPDO to my
KS-24361/Z381x. The red line is the ADEV which seems to cross at 200 and 2000
tau. The green is the output of my board's TIC in ns. It measures the phase
of my OCXO against the sawtooth-corrected PPS from the LEA-6T.
Hi Arthur,
Yes, it's there on mine. It's hard to think it would be able to control the
OCXO without it.
Bob
From: Arthur Dent golgarfrinc...@gmail.com
To: time-nuts@febo.com
Sent: Wednesday, November 5, 2014 5:29 PM
Subject: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A,
Hi Bob,
I've been using the Satstat program to send commands. What I don't understand
is why the slave will accept commands such as sat elevation angle and not give
an error response. It gives a response of command complete, but it doesn't
change it. Or is that an indication that both units
Hi Anthony,
What are you feeding your units with for power? I'm using a couple of 20V PC
type bricks on mine. Have you tried just a plain old terminal program running
9600,8N1 on the right comm port? Did you click CommPort-Port Open in the
SatStat program? Did yo make sure the SatStat
will it work on? XP,
W7 32 or 64 bit? XP I guess?
Bill Riches
Cape May
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart
Sent: Friday, November 07, 2014 12:03 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time
Hi Anthony,
I was getting that error, then communication established, then some rapid
fire procession of error messages that I didn't write down, then back to
trying to establish communication. It's probably something simple like a bad
cap, but it was still under warranty, so not my problem.
Hi Bob,
I've been using the cheat method that Stewart posted. It's mostly working,
but I do see occasional errors. So, I ordered the following USB to RS-422
adapter. Now your post makes me worry that there's still going to be a
problem. I'll post results back to the list. It is a FTDI
Hi Paul,
I saw the phase of the 10MHz signal dip by about 60ns twice today as compared
to my homebrew GPSDO. Given what I know about the design of my unit, it's hard
to believe it could follow the path the phase difference took, but I suppose
anything's possible. Bob posted a graph showing
Hello to the list. I saw on K3PGP's site a mention that the UT-41 GPS receiver
had a 10KHz signal on-board so I decided, why not build a GPSDO for my new HP
5334B? Unfortunately the one I bought doesn't have a 10KHz point, and the
board doesn't even pull out the 1PPS signal from the chip. So
on giving.
$
Regards
Paul
WB8TSL
On Thu, Jun 13, 2013 at 2:41 PM, Attila Kinali att...@kinali.ch wrote:
On Wed, 12 Jun 2013 20:29:26 -0700 (PDT)
Bob Stewart b...@evoria.net wrote:
Hello to the list. I saw on K3PGP's site a mention that
the UT-41 GPS receiver had a 10KHz
: Attila Kinali att...@kinali.ch
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Cc:
Sent: Thursday, June 13, 2013 3:39 PM
Subject: Re: [time-nuts] New to list and GPSDO questions
snip
[3] Describes how to use a clock
synchronizer to build
...@ptialaska.net
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Cc:
Sent: Thursday, June 13, 2013 5:51 PM
Subject: Re: [time-nuts] Fw: New to list and GPSDO questions
Hi Bob,
The VE2ZAZ controller is a frequency locked loop that keeps
OK, I believe you. I can see I have a lot to learn.
Bob
- Original Message -
From: Richard H McCorkle mccor...@ptialaska.net
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Cc:
Sent: Thursday, June 13, 2013 7:04 PM
...@ptialaska.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Cc: Bob Stewart b...@evoria.net
Sent: Thursday, June 13, 2013 8:58 PM
Subject: Re: [time-nuts] Fw: New to list and GPSDO questions
I'm with Bob in that I don't really understand this description
Perry,
Could you give me some context for your post? Is this related to my post about
building a GPSDO, or is this something else? It looks like Bert did something
specifically for the 3586. That is not what I was posting about.
Bob
- Original Message -
From: Perry Sandeen
I found an old post that indicated that it is a relabeled Vectron OC-050. Can
anyone verify that? I've gotten most of the parts for my VE2ZAZ GPSDO, and am
now trying to lay out how it's all going into the HP 37203A box.
Bob - AE6RV
___
time-nuts
, already. I was
just looking for more. =)
Bob - AE6RV
- Original Message -
From: Bob Camp li...@rtty.us
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Cc:
Sent: Saturday, June 22, 2013 7:26 AM
Subject: Re: [time-nuts
In that case, I probably have more information than I have any right to have.
=)
thanks,
Bob
- Original Message -
From: Bob Camp li...@rtty.us
To: Bob Stewart b...@evoria.net
Cc:
Sent: Saturday, June 22, 2013 10:57 AM
Subject: Re: [time-nuts] Still looking for datasheet
I need to get some largish prototype boards for my project. Has the industry
standardized on a 0.10 pitch for hole spacing? IOW, if the ad says 2.54mm
pitch will I get a board that will fit American chips, or will I just get
something metric sized for the landfill? I ask, because I've got a
...
if it is, you should be fine with 0.1 pitch chips.
Orin.
On Mon, Jun 24, 2013 at 9:10 PM, Bob Stewart b...@evoria.net wrote:
I need to get some largish prototype boards for my project. Has the
industry standardized on a 0.10 pitch for hole spacing? IOW, if the
ad
says 2.54mm pitch
Brent,
I seem to remember a story about the early days of micro-computing, when Russia
was cloning 8080 chips. Their chips were of such poor quality that each chip
had a unique list of executions that could not be used. Anyway, the Russians
had sized their chip in metric measurements
You are right, I was wrong. The Russian 8080 boards were made with 2.5mm, not
2.54.
- Original Message -
From: MailLists li...@medesign.ro
To: j...@quikus.com; Discussion of precise time and frequency measurement
time-nuts@febo.com
Cc:
Sent: Tuesday, June 25, 2013 10:05 AM
Hi Hal,
I had always used 25.4001 or .03937 to do my conversions. So, I looked online
and found the .039370078 and did the reciprocal. It is, indeed very very close
to 25.4. If you google 25.4001 conversion you can find lots of tables using
that as the conversion factor online. I don't
In fact, if you just copy through the word when, it works without any
cutting, pasting, or editing.
- Original Message -
From: Mike Suhar msu...@woh.rr.com
To: time-nuts@febo.com
Cc:
Sent: Wednesday, June 26, 2013 8:00 AM
Subject: Re: [time-nuts] inch/mm conversion
You need
My UT+ unit does not have the onboard battery. In looking at the various
manuals, I see that the battery backup voltage is from +2.5 to +5.25V. So,
should I grab a 3V lithium cell and mount off an old motherboard, or should I
use a pair of AA batteries in a holder I think I have around here
I'm using an HP 37203A case (half size) for my GPSDO project, but the output
from the transformer is just too high to get +12V @ 1A to power the OCXO from a
simple regulator. So, what are people using for quick and dirty 12V 1+A power
supplies? I'm not in love with the idea of using a wall
luck with. Maybe
the brick is the best option.
Bob
From: Chris Albertson albertson.ch...@gmail.com
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Thursday, June 27, 2013 1:32 PM
Subject: Re
can
pull a few turns off the transformer secondary, as well.
Bob - AE6RV
- Original Message -
From: Hal Murray hmur...@megapathdsl.net
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Cc: hmur...@megapathdsl.net
Sent
Thanks Don! That's exactly what I'm looking for.
Bob - AE6RV
- Original Message -
From: Don Latham d...@montana.com
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Cc:
Sent: Thursday, June 27, 2013 2:51 PM
Subject: Re
robert8...@yahoo.co.uk
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Thursday, June 27, 2013 4:09 PM
Subject: Re: [time-nuts] +12 Volts 1A (plus a bit) supply?
Hi Bob,
As adrian has said, 20V off load is not really excessive
, at 3:49 PM, Bob Stewart b...@evoria.net wrote:
Hi Hal and other responders,
I believe that the OCXO uses an ON-OFF type of regulation. So, no, it
doesn't use 1A all the time. Maybe I should just put an ammeter in the line
and see what kind of duty cycle it has after it's at temperature
Oops, I sent this as a reply to Richard, but I had meant it for all. Also, in
the interim, Bob Camp had advised me that my OCXO load current was most likely
only 750ma instead of 1000ma. I checked it and it was about 690. Moral of the
story: check it, don't just rely on the datasheets. =(
Hi Brian,
I also wanted to reduce the amount of power wasted through passive devices. As
it turned out, though, I had more tolerance for heat waste than I had thought.
But, the general discussion this has become is also good.
Bob - AE6RV
- Original Message -
From: Brian Alsop
I believe the original problem was that the raw unregulated voltage may
be marginally too high for a conventional three-terminal to take safely
Hi Ed,
Not really. The voltage is in line with the product specs for a 7812 (35V
max), as is the current I had projected (a bit over 1A). However,
I haven't followed this discussion, and I probably do not understand it well
enough to comment, but here goes, anyway.
Have you considered the situation of using two J/K flip flops and an AND gate
to subtract one bit stream from another? I drew up a circuit back in the 70s
and never tried it
Hi Ed,
Are you talking about using GPS satellites, which means you have to have an
extremely accurate clock to know where they are to correct for doppler, or are
you talking about WWV, which means you have to deal with multi-path,
atmospheric doppler, fading, and propagation?
Bob - AE6RV
QST did a review of the Rigol DSA815-TG in the February 2013 issue, page 55.
The specs were determined to be as specified by Essco Calibration Labratories
of Chelmsford Mass. There is a copy here:
http://ed31.ref-union.org/Test_RIGOL_QST_February%202013.pdf
Bob - AE6RV
- Original
Wouldn't a Cs or Rb clock in orbit be slow due to relativistic effects? I'm
pretty sure there is a relativistic correction to the GPS clocks.
Bob - AE6RV
- Original Message -
From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement time-nuts@febo.com
You're still here, but what about the young women who painted those watches who
aren't? The problem was that they needed sharp points on the brushes to fill
the tiny voids in the hands. So they twirled the brush tips between their
lips. They could probably bring back radium dials today with
I follow a BBC news site and this article popped up to bring us back on topic.
Hope it's not old news
http://www.bbc.co.uk/news/science-environment-23231206
Bob - AE6RV
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
After ham-fistedly breaking a few things, I've finally got my GPSDO working.
(does happy dance) Now that it's had some time to warm up I see that it's
started wandering around +/- a couple of counts from sample to sample (16
seconds). Is this because the UT+ is not set to timing mode?
is working
Hi
On Jul 11, 2013, at 11:59 PM, Bob Stewart b...@evoria.net wrote:
After ham-fistedly breaking a few things, I've finally got my GPSDO working.
(does happy dance) Now that it's had some time to warm up
Time as in minutes, or as in a couple of days? If you look at the plot in the
QEX
From: Chris Howard ch...@elfpen.com
To: Bob Stewart b...@evoria.net
Sent: Friday, July 12, 2013 6:45 AM
Subject: Re: [time-nuts] GPDSO is working
On 7/11/2013 10:59 PM, Bob Stewart wrote:
After ham-fistedly breaking a few things, I've finally got my GPSDO working.
(does happy dance
on the timing mode. What reference are you
using? That is, your counter is using its internal reference or else.
On Fri, Jul 12, 2013 at 5:59 AM, Bob Stewart b...@evoria.net wrote:
After ham-fistedly breaking a few things, I've finally got my GPSDO working.
(does happy dance) Now that it's had some time
.. I'm also interested
in the idea of using a USB-TTL converter, but I haven't seen a decent one with
the square(ish) socket, rather than the rectangular one.
Bob - AE6RV
From: Chris Howard ch...@elfpen.com
To: Bob Stewart b...@evoria.net; Discussion of precise
examine that for awhile. I
have a few ideas I'd like to try out that probably only apply to the OCXO I'm
using.
Bob
From: Chris Albertson albertson.ch...@gmail.com
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time
Hi Brian,
I don't understand. Are you saying that I need to add still more parts to get
an RS-232 to TTL adapter to work? Here's the circuit for what I'm currently
using, and it looks like it's inverter based. I'm not using it, because it's
the only one I have and I want to keep it
...@nc.rr.com
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Friday, July 12, 2013 9:09 PM
Subject: Re: [time-nuts] GPDSO is working
Hi Bob,
Here is my experience. I had a PIC that output RS232 at 0-5 volt
levels. It actually
OK, this isn't as easy as I thought it would be. Is there any Linux software
to interface with the UT+, or will I have to swap out a disk and boot Windows
to get the eval software from Synergy-GPS to work? I see some primitive source
code on the net but getting anything useful out of that
Hi Paul,
There are a couple of problems here. First of all is that the SynTac software
is not free, and I have no interest in trying to get around their trial period
scheme, nor any interest in buying a copy just to sit and watch it run. =)
Next is that I don't really want to deal with a
From: Paul tic-...@bodosom.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sunday, July 14, 2013 5:40 PM
Subject: Re: [time-nuts] UT+ Software for Linux?
Date: Sat, 13 Jul 2013 17:05:10 -0700 (PDT)
From: Bob Stewart
Is there any Linux software
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