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. T
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
To: time-nuts@febo.com
Sent: Wednesday, November 5, 2014 5:29 PM
Subject: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A,
Z3812...
Could
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 progr
Hi Bill,
I think I got my copy here. I used the bottom one. I don't know what a 58503
is. it was hard to find, for some reason. I'm using XP on an old laptop.
http://www.ko4bb.com/manuals/index.php?dir=05%29_GPS_Timing/SatStat
Bob
From: Bill Riches
To: 'Bob Stewart&#x
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 dev
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 the
Surround your house with a complete loop of #6 wire with 8-10 ft long ground
rods every 10-12 ft (but no less than 6ft), bonded (clamped) to the ground at
the service entrance. That's the simple answer. The somewhat longer answer is
in a recent copy of the ARRL Handbook. Some will argue for sm
Hi Dave,
Speaking only for myself, most of the fun is in the reinventing of the wheel.
I have no real use for a frequency standard, but designing and building my
GPSDO has been very rewarding. Eventually I hope to be able to share it with
someone besides Dan, who has been a big help on the ha
For Linux, I worked this up and posted to linuxquestions.org. I don't
guarantee it, but it's been working for the PL-2303 devices for me. It just
creates a link to the "real" driver. There are probably better ways to do it.
File: /etc/udev/rules.d/70-persistent-usb.rulesACTION=="add",
KERNEL
Hi,
I suggest that you use a DVM to see which ports are getting power. Better yet
would be to disconnect everything and use an ohm-meter to see which ports are
electrically connected. If you can't satisfy yourself that you know what's
what, then contact GPS Source. They are very good people t
I've just won a "Symmetricom / Datum PRS45A PRS45-0001K - Single Cesium PRS-45
DS1" on ebay from a guy in the Netherlands. It's listed as used in good
working condition, so ebay should protect me if it's not. Hopefully he has the
training to get it to me.
It seems to also be known as a "TImeC
ent I have says that it uses redundant external power sources. I take
that to mean that I can safely supply only one side and be fine?
Bob
From: Poul-Henning Kamp
To: Bob Stewart ; Discussion of precise time and frequency
measurement
Sent: Monday, December 1, 2014 11:15 AM
Subject:
] PRS-45 Cs Standard
Hi Bob,
On 12/01/2014 05:54 PM, Bob Stewart wrote:
> I've just won a "Symmetricom / Datum PRS45A PRS45-0001K - Single Cesium
> PRS-45 DS1" on ebay from a guy in the Netherlands. It's listed as used in
> good working condition, so
Hi Graham,
There was a post, I think by Anthony, that discussed the USB adaptors. But
your pinout looks different than the adapter I got. You have pin 1 listed as
TX (-) whereas on mine pin 1 is TX (+). Likewise, you list pin 2 as TX(+)
where mine is TX (-). In any case, here is the wiring I
Look at Bob Camp's post. Yahoo mail made a hash out of my formatting.
Bob
From: Bob Stewart
To: Discussion of precise time and frequency measurement
Sent: Monday, December 1, 2014 8:17 PM
Subject: Re: [time-nuts] Lucent KS-24361 RS-422 interface pinout
Hi Graham,
There was a
Hi Magnus,
It came in today. Looks good from the outside. No obviously bad smells, but I
can't power it up, as my PSU hasn't come in yet.
There is a paper Datum tag dated 6/2/03 on the outside. Looking through the
vent holes, I can see a Datum Cesium Beam Tube assembly Model Number 7613A/07
at thread.
Bob
From: Magnus Danielson
To: time-nuts@febo.com
Cc: mag...@rubidium.se
Sent: Friday, December 5, 2014 6:10 PM
Subject: Re: [time-nuts] PRS-45 Cs Standard
Bob,
Do open up and take a look. Do take photos. Do share. :)
Bet the bottom plate is a good start.
Cheers,
Magn
Hi Bob,
It's pretty much clean. There is a "Datum is now Symmetricom" decal, as well
as a Symmetricom decal. There is a round paper sticker that says "Datum TT&M"
with a date and probably someone's initials. And what looks like a small paper
sticker on the back that was removed. There was al
Hi Paul,
This puzzled me, too. Finally, I just deleted the txt file. Looking at, it,
it looks like maybe it's a weekly file. For example: Z38XXData2014CW50.Txt,
seems to mean week 50. At least that's my guess, since there's also a file
Z38XXData2014CW49.Txt that was last modified Sun 07 Dec
Well, it's alive, and I even have 10MHz coming from it. It took about 16
minutes to go to lock. Is that good, or doesn't matter? Now I've got to put
together a serial cable and see if I can talk to it and find out how it thinks
it's doing. But, this is good!
www.evoria.net/AE6RV/PRS-45A/20
power
outages. So, should I put a latching relay in the power stream to keep it off
if I lose power? The budget is now officially busted, and a UPS is not going
to happen for awhile. Santa's sleigh is now officially out of gas.
Bob
From: Pete Lancashire
To: Bob Stewart ;
Hi Bob,
I can't speak for Dan, but since he hasn't responded, I can speak a bit about
the issue. As you know, my GPSDO uses a constant voltage TIC and the PWM
output from a dsPIC33 to perform the DAC function. During testing we've found
that one critical point is that the PWM voltage from the
Hi Bert,
Thanks for the comments. I did learn today that this was a recent pull, so
that explains why it came up well. I hope you'll understand my reluctance to
start making adapters and doing direct measurements on the thing. One of my
next steps is to get it to talk to me. Unfortunately, I
dea and prudent. Besides
> while it is reacquiring lock you would probably be busy resetting VCR's and
> so forth.
>
> BillWB6BNQ
>
>
> Bob Stewart wrote:
>
> Hi Pete,
>> I don't have any way of knowing. I've asked the seller if he has a copy
>>
Thanks Paul. It does seem too good to be true, and it certainly came at the
right time in my GPSDO development effort.
Bob
From: paul swed
To: Discussion of precise time and frequency measurement
Sent: Tuesday, December 9, 2014 8:04 AM
Subject: Re: [time-nuts] PRS-45A is alive!
B
Subject changed, as I inadvertently stole Dan's thread.
Hi Bob Camp,
You wrote: "Looks perfectly normal to me. Your Cs is sensitive to magnetic
field. Have you “zeroed” it out? No of course not, nobody does. (almost nobody
…). "
What does it mean to "zero out the magnetic field" for a Cs? Soun
he thermal noise.
Bob
From: ed breya
To: time-nuts@febo.com
Sent: Tuesday, December 9, 2014 3:30 PM
Subject: Re: [time-nuts] Linear voltage regulator hints...
I'd recommend going with what Bob Stewart mentioned, using separate
gates as buffers, operated from a better-grade refe
ed to worry?
Bob
From: Bob Camp
To: Bob Stewart ; Discussion of precise time and frequency
measurement
Sent: Tuesday, December 9, 2014 6:11 PM
Subject: Re: [time-nuts] PRS-45A
Hi
Somewhere in / on the beast there should be a magnetic field adjustment. You
play with it (within reaso
I've been uncomfortable with this KS since I got it; even having to return the
REF-0 unit for comms problems. Now that I have the PRS45A, I think I've proved
that the KS does have a problem. Has anyone else had something like this plot
shows? Any idea what's causing it? I'm not seeing anythi
Hi Charles,
These hiccoughs match the ones I was getting comparing the KS to my homegrown
GSPDO, so I don't think there's any chance it's the PRS45A. I was wondering if
it might be the antenna. My homegrown unit uses the same antenna via a GPS
Source MS-14 splitter, but the LEA-6T in my homegr
n the next input on Channel A
and the following input on Channel B. I don't think it would change anything
to arm from the KS.
Bob
From: Adrian
To: Bob Stewart ; Discussion of precise time and frequency
measurement
Sent: Wednesday, December 10, 2014 2:54 PM
Subject: Re: [time-n
Charles, I have what I have. No, I do not have a 360 degree view of the sky,
and that's not likely to change for some time. I have the southerly 180
degrees from about 20 degrees elevation and up. I bought this KS as an example
reference for my homegrown. It may be that it's just not up to t
The issue for me is that if it couldn't get a good timing solution, why did if
fail quietly? I would expect it to at least go into holdover and turn on an
alarm or something. It was giving me fits at least 4 times a day, so I should
have some idea whether using a different port on the splitter
rying the attic antenna as
a test.
Bob
From: Bob Camp
To: Bob Stewart ; Discussion of precise time and frequency
measurement
Sent: Wednesday, December 10, 2014 5:04 PM
Subject: Re: [time-nuts] KS problem
Hi
Have you dumped the log file from the KS and seen what it says abou
Well, it just headed south again. I don't see anything on the status screen,
captured below, but that may just be me. I also captured the normal PPS TI &
EFC screen. (Both from Z38XX.exe) The EFC screen just looks ugly to me. You
can see where it went south over on the right with the sudden
Sorry about that. Hopefully this separates the two links. I'm going to have
to ask John what's causing this.
http://evoria.net/AE6RV/KS/KS.Screen.png
break
http://evoria.net/AE6RV/KS/KS.Status.png
From: Bob Stewart
To: Discussion of precise time and frequency measureme
. I'll give it another test when that happens.
Right now I've got a new board to design with improvements Dan and I have made
on the prototype.
Thanks for everyone's help and suggestions. I'll let it alone for awhile.
Bob
From: Bob Camp
To: Bob Stewart ; Discu
Hi Charles,
I hope you don't mind if I throw my two cents in, as this began as a question
about my GPSDO project. We had a thermal drift problem that Dan traced to the
PWM to EFC interface and resolved. The question to the list was whether there
was a regulator package that had a built-in refe
Charles Steinmetz posted a link to Wenzel Squaring circuits in Li Ang's thread,
and I'm particularly interested in the line receiver method. On the wenzel.com
page the line receiver was an SN55182. In Bert Zauhar's GPS Standard, he used
an LTC-1485 for the OCXO input. Is there something in pa
Hi Stan,
Is there a green LED lit on the board near the power block, or are both red and
green very dim or not on at all? I have a unit with the same symptoms as
yours. Both output voltages are extremely low from the power block. Unless
the green LED is lit or flashing, I'd send it back.
Bob
Does your oscillator have a VRef output? If so, use that instead of a
regulator. It's cleaner and usually temperature compensated.
Bob
From: ct1dmk
To: Discussion of precise time and frequency measurement
Sent: Tuesday, January 6, 2015 6:40 PM
Subject: [time-nuts] VC-OCXO EFC stabi
M
Subject: Re: [time-nuts] VC-OCXO EFC stability.
Hi Bob, That is the issue, it doesn't.
(the 2,3 different types I would like to use none of them have it, so I will
be making a small pcb with the trimpot and the regulator and some
capacitors etc).
Luis Cupido.
ct1dmk
On 1/7/2015 1:09
John,
If that's a TimeCesium device, then the Monitor3.exe program from Symmetricom
should work. I have a copy on my domain at
www.evoria.net/PRS45A/Monitor3.zip
Bob - AE6RV
From: John Fullington
To: time-nuts@febo.com
Sent: Friday, February 13, 2015 1:14 PM
Subject: [time-nuts] Ti
Hi John,
Doesn't that have a NEO-6M in it rather than a timing receiver?
Bob
From: John Miles
To: 'Discussion of precise time and frequency measurement'
Sent: Sunday, March 22, 2015 5:49 PM
Subject: Re: [time-nuts] Some observations of the BG7T BL GPSDO
>
> Curious, but I'm wond
Hi Cash,
Have you looked at the sourcecode for the "gpsd" package? "packet.c" would
probably be your starting point. The gpsd package parses pretty much every gps
receiver. I'm not sure if this is what you're looking for, or if you
specifically want something high-level.
Bob
From: C
This is just a brief report, not a how-to.
I got a KS_24361 with a bad Lucent power module. Having nothing to lose I
thought I'd see if it came apart. After unsoldering it from the motherboard, I
found the usual potting compound. Fortunately, the compound was only loosely
attached to the boa
OK, that explains your comment. This is most likely a silicone based potting
compound. It's a bit softer than an eraser when cold. Very little of it was
actually stuck to the board or components. If it had been a hard, epoxy-based
covering, I wouldn't have bothered with it.
Bob
From:
Art Sepin of Synergy Sys gifted me with a big pile of timing related junk for
Christmas, and out of the pile, I have around 20 UT+ receivers that seem to
work properly. So, I'd like to offer them to time-nuts who are in need of one.
Most have the right angle MCX antenna connector, but some of
My internet has been down all day, and now that it's back up, I see a bunch of
requests for receivers. They're all spoken for now, and in fact maybe a bit
over-subscribed. I'll contact each of you individually who responded offline.
Bob
___
time-nuts
I got a new 5370A, so of course I've been running a bunch of tests on it. In
the image linked below, the start channel is my PRS-45A, the stop channel is my
GPSDOe ("e" is for engine) and the ARM channel is fed by the PPS from my
SSR-6Tru. As you can see in the notes, the test parameters are a
warm up my spare 34310-T and see what happens when using that
as the reference.
Bob
From: Bob Camp
To: Bob Stewart ; Discussion of precise time and frequency
measurement
Sent: Thursday, May 14, 2015 6:06 AM
Subject: Re: [time-nuts] New 5370A
Hi
One of the (many) nice thing(s) about
surement
Sent: Thursday, May 14, 2015 12:21 AM
Subject: Re: [time-nuts] New 5370A
Bob Stewart wrote:
> ... And kudos to John for Timelab. It doesn't play well with Wine in Linux,
> but
> that's not terribly surprising, all things considered.
Really? How so?
Wine te
Hi Bob,
On 05/14/2015 05:11 AM, Bob Stewart wrote:
> I got a new 5370A, so of course I've been running a bunch of tests on it. In
> the image linked below, the start channel is my PRS-45A, the stop channel is
> my GPSDOe ("e" is for engine) and the ARM channel is fed b
I did some idle searching trying to see if there was a relationship between
terrestrial tides and timing receivers. I couldn't find anything useful, but I
did discover that the Jersey Village area, about 2 miles northeast of me, is
sinking about 2 inches a year. So, my question is what effect d
Tom said: "The nice thing about GPS, unlike other time transfer methods, is
that can handle the case of a moving antenna. As the antenna moves so does the
time. This is why GPS timing receivers work (almost as well) on top of your car
as on top of your house."
I don't get that. What's the purpo
Hi Bob,
How is this achieved? Is there a coupled dead-reckoning system that updates
the timing location, or something else?
Bob
From: Bob Camp
To: Bob Stewart ; Discussion of precise time and frequency
measurement
Sent: Monday, May 25, 2015 1:53 PM
Subject: Re: [time-nuts
0-D and then a day in 3-D and see what difference there is in RMS
timing residuals (or in ADEV). I wonder if your GPSDO can even measure the
difference.
/tvb
- Original Message -
From: "Bob Stewart"
To: "Discussion of Precise Time and Frequency Measurement"
Sent: M
7;t have the antenna located in a position suitable for precision
timing. The power of the HOA is not to be trifled with. That, and the sky is
full of power lines and other junk around here.
Bob
From: Bob Camp
To: Bob Stewart ; Discussion of precise time and frequency
measurement
Sent:
Does anyone have any information about the Trimble 65256 OCXO? I bought one
recently and hooked it up to 12V per the vendor. (Yeah, I know.) Although it
worked, it set off such a stench: the usual electronics burning up, give you a
sore throat smell. So, I got a replacement and same thing.
I need to capture the time between the PPS and the OCXO on my GPSDO to
fine-tune my calibration curve. I'm having good luck doing this with my 5335A,
which of course, has less resolution than my 5370A. But, when I setup the
5370A with what I think is the right setup, every 6th or 7th value is
Is there a practical limit to the number of GPS sats overhead at any one time?
I ask this because I'd like to start parsing this info from my ublox receiver
and need to setup an array for the values. Memory is not unlimited on my PIC.
Bob - AE6RV
___
Thanks Chris and everyone else who responded. I just didn't know what to look
for. The full 36 shouldn't take up all that much memory.
Bob
From: Chris Hoffman
To: Bob Stewart ; Discussion of precise time and frequency
measurement
Sent: Thursday, July 9, 2015 5:48 PM
S
I want to change the UART1 port speed on my LEA-6T via message string from my
GPSDO board. I had assumed that I would have to discover (or know) the baud
rate already set on the LEA-6T in order to change it. But it appears that the
LEA-6T can receive messages at any baud rate, but you need to
Speaking with Tom recently impressed on me just how much I don't know about
what's "normal" for a GPSDO. The options on the LEA-6T are formidable and have
consequences for my GPSDO. The question I'm struggling with now is what's
normal during the survey process? The only example of a commerci
Hi Poul,
"0) Make sure that the counter does not get its reference frequency
from any of the input signals."
Does your rule 0 hold if one of the input signals is a Cs standard? I believe
I've posted in the past that the ADEV from 1 tau to 100 tau is a bit noisy if I
use the internal 10811 t
Hi Poul,
Here's an example of what I'm talking about. See description and notes. The
blue trace is the one using the clock in the 5370A. The other tests match
pretty closely down to around 60s or so.
http://evoria.net/AE6RV/5370A/Test1.png
Bob
From: Poul-Henning Kamp
To: B
Hi Bob,
I believe that the approach I used in the example plot I linked in the other
post was PPS to ext/arm, GPSDO 10MHz to start, Cs 10MHz to stop. So, is this a
methodology issue, then?
Bob
From: Bob Camp
To: Bob Stewart ; Discussion of precise time and frequency
measurement
Hi Nick,
In fact, if no-one else has volunteered, contact me offline and I'll run a test
for you on my equipment, which is an HP5370A and a Symmetricom PRS-45A Cesium
standard.
bob at evoria dot net
From: Tom Van Baak
To: Discussion of precise time and frequency measurement
Sent: Su
I've been doing some tests on my GPSDO with the LEA-6T location deliberately
set somewhere far away. I had U-Center V8.17 running and connected to the
receiver. During some of those tests, the CFG-TMODE mode switched from Fixed
Mode to Disabled without any commands from me. As a result, the r
Synergy GPS makes an SSR-6Tr board that speaks Motorola binary and would
probably work in the KS-24361. It's on an M12+ sized board, so you'd also need
their adapter board to fit it in. Their SSR-M8T board would probably do the
same thing but using an LEA-M8T receiver. I believe they're selli
Hi Alex,
It's called a slidelock. Here's the link I posted last time this came up.
Look at the bottom right.
http://www.mouser.com/catalogviewer/default.aspx?page=1605&highlight=706-160X10689X&catalogculture=en-US&catalog=647
Bob
From: Alexander Huemer
To: time-nuts@febo.com
Sent: Thu
Hi Skip,
You might try contacting Symmetricom directly. That's how I got my copy of
monitor3.exe for my PRS-45A. You can change the baudrate etc on monitor3.exe.
Bob
From: Skip Withrow
To: time-nuts
Sent: Thursday, October 29, 2015 9:18 AM
Subject: [time-nuts] Looking for Datum/Sy
Tom,
It's been awhile since I did soundcard SSTV, but the program MMSSTV uses the
time ticks from WWV to do a calculation similar to what you describe. You tune
in WWV on your receiver, which is coupled to your computer's soundcard. The
MMSSTV calibration routine puts a raster scan on the scre
Hi Mark,
What's the inherent problem with the idea? In the early days of radio, they
used commercial radio transmissions as an encryption mechanism, so there is
some history of using commercial radio as a reference source. Is it simply a
matter of different propagation delays and multi-path is
Hi Mike,
I'm far from an expert on this, but what you're missing is that time and space
isn't the same between any two points that are located in different gravity
gradients and/or moving at different relative velocities. The hyperfine
transitions are happening at the same local rate whether th
ts of spaghettification, or course.) But
generations of people back on earth would live and die for each tick of your
watch.
Bob
From: Mike Feher
To: 'Bob Stewart' ; 'Discussion of precise time and frequency
measurement'
Sent: Friday, November 27, 2015 12:10 PM
Hi John,
I hadn't run into this idea before, and I like it. But I have a problem with
the statement:. "If you move through space at 100,000,000 meters per second in
space, then your velocity in the t direction is 283,000,000 meters per second
(because sqrt(100E6^2 + 283E6^2) = 300E6.)" The pr
Hi Paul,
For what it's worth, I've been using a Chinese rework station labeled 852D+
from ebay. It's not that expensive, and does a pretty good job. The only
complaint I have about it is that it pushes just a bit too much air at the
lowest setting. Oh, and the nozzles take a bit of time to ch
Hi Bruce,
Thanks a LOT for your response to Poul's query! I've been searching for DMTD
info for a few some time now, and I haven't come up with a lot. Searching for
"CERN White Rabbit" got me more in a few minutes than I've found in months.
Like Poul, I've become interested in building a DMTD
Hi Poul,
Your comment about on-chip PLLs got me to wondering about the dsPIC33FJ128MC804
I'm using in my GPSDO. So, I put it on the 5370A to see what's up. Input to
the gate port is the drive signal for an LED that I flash at 1PPS (controlled
by an on-chip timer). I delay that with a 10ft pi
I've been running up a number of OCXOs lately, all Trimble 34310-T. For most
of them, the DAC moves in the negative direction after lock. But there are a
few where the DAC moves more positive. Is this an indication of a different
cut of crystal, or is retrace direction more or less random?
B
k, as I've built only a limited
number of these units. The normal situation is to retrace downward from the
start, once initial warmup is over.
Bob
On Wed, 2/10/16, Tim Shoppa wrote:
Subject: Re: [time-nuts] OCXO Retrace
To: "Bob Stewa
Hi Charles,
I'll see if I can figure out which of these is retracing the "wrong" way and
put it in a unit. I'll let it cook for a couple of days and then post a plot.
Like I said, these are all Trimble 34310-T, though I know that there were at
least two manufacturers for that part number. Th
Hi Tom,
Thanks for posting this. I'm looking at the timelab plot, and the only thing I
can relate that to is a musical note played backward. IOW, the decay seems
backwards to me.
Bob - AE6RV
On Sat, 2/13/16, Tom Van Baak wrote:
Subject: Re: [ti
Hi Bob,
I've had essentially the same experience with a batch of 34310-Ts that I got
from China. Some are very good, most are good enough, some work but are
useless for anything serious. I haven't gone through enough of them to get any
feel for the waste rate. Hopefully it won't be more than
Has anyone coded a PICDiv type of solution into a dsPIC33F chip using a 32-bit
Type B timer? I've been doing some experimentation over the past few days, and
I've had a few latency issues when using the internal clock, which is PLL
linked to the 10MHz external clock input. The problem shows up
I started getting noise spikes of up to 500ps on my 5370 the other day. When I
switch to external clock and use the PRS-45A, the noise goes away. In fact,
the noise issue is way better than with the 10811. I swapped in a different
10811, and the noise doesn't seem to have returned, but it was
hat is at least one thing to test.
Cheers,
Magnus
On
03/23/2016 04:37 AM, Bob Stewart wrote:
>
I started getting noise spikes of up to 500ps on my 5370 the
other day. When I switch to external clock and use the
PRS-45A, the noise goes away. In fact, the noise issue is
way be
Hi Bob,
Could you use a gate instead of an amp?
Bob
On Thu, 3/24/16, Bob Camp wrote:
Subject: Re: [time-nuts] Spectrum Analyzer Specifications
To: "Discussion of precise time and frequency measurement"
Date: Thursday, March 24, 2016, 5:48 PM
H
Hi Oleg,
I'm interested in your PN test set. I'm sure a number of us are. If you have
webpages or documents up, could you share them with the list? Otherwise, could
you email me direct?bob at evoria dot net
Bob
On Sun, 3/27/16, Oleg Skydan wr
As a victim of the "I'm gonna build a GPSDO" virus, I think the cautions are
well worth mentioning. Building a decent GPSDO sounds like such a simple
thing, but it slowly turns into a rabbit hole as you discover you need ever
better test equipment, and a microscope, and hot air rework station,
Hi Charles,
I've changed the subject line, so I hope this isn't perceived as a thread-jack.
It's always dangerous to post anything substantive to this list, but I think
it's about time. Here's a timelab file of my GPSDO, which I've been working on
for quite some time with help from Dan K and o
I recently bought a number of LEA-M8T receivers and I have to say that I am
unimpressed, so far. They don't survey to the same reported accuracy as the
LEA-6T in the same amount of time. They certainly aren't better in the jitter
after sawtooth correction. So, have I managed to overlook some
l the many, many data structures.
Bob
On Wed, 4/6/16, Logan Cummings wrote:
Subject: Re: [time-nuts] LEA-M8T
To: "Bob Stewart" , "Discussion of precise time and frequency
measurement"
Date: Wednesday, April 6, 2016, 8:18 PM
Hi Attila,
The two versions of the -6T I have experience with - LEA-6T-0-001 and
LEA-6T-1-000 - have both had a single shield. So, that implies that these are
at least 2 steps older than what's out now. The price? They must be getting
them at or near single digits USD.
Bob
-
I hope I haven't posted about this before, but it's something that's bugged me
for awhile. When I run a survey-in on an LEA-6T, the CFG-TMODE2->fixedPosAcc
value seems to be wrong. For instance, I ran a survey today and told it to run
for 32,400 seconds and reach at least 350mm accuracy. When
Hi Ryan,
For the few years I've been on time-nuts, I understood the consensus view to be
to get a good quality RG-6QS satellite cable. A few of the posts in this
thread have made me wonder if the consensus is changing, or if it's just too
much trouble to stand up to the crowd. I've got about
d Scope, assuming the propagation
delay is what the spec sheet claims to be (most RG6 seems to
be right around 80%) (the home depot stuff seems to be
79%).
>
> -Ryan
Stasel
>
>> On Apr
22, 2016, at 14:38 , Bob Stewart
wrote:
>>
>> Hi
Ryan,
>>
>
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