--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
Twitter: @gm8arv
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nly make darn sure they had headers fitted before being returned
to the box!
Nigel, GM8PZR
-Original Message-
From: Julien Goodwin
To: gandalfg8 ; Discussion of precise time and frequency
measurement
Sent: Thu, 14 Jun 2018 11:36
Subject: Re: [time-nuts] Spectracom 8140T Line Tap
irect Email skipp...@yahoo.com
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el, GM8PZR
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past
times.
Regards,
Perrier
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http://www.mediafire.com/file/c6vv5t71cq741sd/Sayrosa%20607B.zip
For what it's worth, my experience with these has been that by far the most
common fault is the familiar shorted tantalum syndrome.
Nigel GM8PZR
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Has anyone stumbled across the 12V antennas for Symmetricom 2500 Time Source
units. The basic 23 dB model was a Symmetricom 112-1-02, furnished as
part of the 093-03110-11 kit.
They also offered a 40 dB model, 112-8-02 with the 093-30110-12 kit and a
50 dB model, 112-8-03 as
Having followed the conversation and having looked at the p[possibility using a
FRK with laser diode, it is low on our list because of all the ongoing projects
but please if you want to spend time and money use any thing but a FE5680. I
was one of the first using it and noticed and posted a 4
I had the same issue looking for a DC blocking 50ohm terminator. They simply
do not exist. So I just made one. Took a BNC male connector with a chassis
mount flange. 50ohm and 0.015 microfarad capacitor in series. (because that's
what I had on my desk at the time) The frequency i
Ann other Microwave Journal Paper an invited paper but by Morion Inc.
Precise Frequency Sources Meeting the 5G Holdover Time Interval Error
Requirement
Bert Kehren
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switches and a stop watch or similar
timer?
Regards,
Perrier
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List,
Is it practical to try and convert a HP 5370A to the B model. (I know that a
dedicated TN could do it.
Regards,
Perrier
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Burt, who was this guy? Maybe I know him. Was he a ham?
I couldn't take all the stuff but might be interested in some of the smaller
items. Is there test equipment as well?
I don't have a truck; I live in the SFV so it could be worth my time to drive
over and cherry pick, if
I have a Tek FCA3103 300 MHz counter that measures ADEV
as a built in function. When I bring up the settings
menu for the measurement, it has an entry window for
"tau" (the averaging time, IE "sigma sub y of tau").
It defaults to 200 ms. I can enter larger values and
A
Hi All,
Thank You for respond.Yes I will make 58503A to 58503A comparison but my
problem are I got difficulties found the suitable setting for my SR620 to do it
if any one can give a hint about proper setting for SR620 time interval setup I
will happy to follow it. I like to have 10MHz out
3 E-9 Hz. yes
use same cable and same antenna, I also monitor the temp and I sure the temp
variation is very minimal.any one has explanation about this ?Thank YouAnton
| | Virus-free. www.avg.com |
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To
surprised these haven't sold out sooner.
Usual disclaimer, no vested interest whatsover, but with just three left if you
hesitate I might buy another whilst you're thinking about it:-)
Nigel, GM8PZR
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and follow the instructions there.
Richard McCorkle on his own GPSDO design had a separate PIC keep track of the
saw tooth information from a M12 ad and subtract during the filter time
constant and transferd the sum to the filter for processing.
Bert Kehren
In a message dated 5/21/2018 2:55:44 PM Eastern Standard Time,
ch
Should say 1.7 nsec we also plan to use the GCLK output for what I call a GPS
PLL we have done it successfully with low cost u-blox with E-11 frequency
results.
Bert Kehren
In a message dated 5/21/2018 7:49:20 AM Eastern Standard Time,
time-nuts@febo.com writes:
Our answer was real
Hi, Thanks for all the responses. The unit has been spoken and paid for. Doug
K6JEY
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.@blueyonder.co.uk
Twitter: @gm8arv
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Hi Hal, and thanks for that.
In my case at least there's no problem with making plots from live data as Lady
Heather will do that for me,
it's just the time taken to collect the data for each plot that could be an
issue.
I'd just been wondering aloud whether any of the online
that it might not be for
this location.
Whatever the optimum might be there's obviously going to be a limit but I do
think it might worth pursuing.
Web sites such as "In The Sky.org" can generate useful plots for any specified
location and time but I don't know if there&#x
ound too, partially at
least perhaps due to a change in antenna gain but either way another can of
worms opened and begging further investigation:-)
Nigel, GM8PZR
From: Bob kb8tq
Discussion of precise time and frequency measurement
Sent: Sun, 13 May 2018 19:05
Subject: Re: [time-nuts] TrueP
Thank you Ole
Juerg and I spend most our time on frequency,control and measuring. We also see
2 E-12 frequency using GPS and blame the Ionosphere. Which brings up the
Question does the way you use the OEMV-3 in your experiment use L1 L2
compensation and where can I buy one? Looked for hours
hat it came out of, but it's surprisingly lightweight,
the outer casing get's "gently warm" after it's been powered on for an
hour or so, but otherwise appears fine.
Is it worth keeping as a portable reference, or ???
Regards to All.
Dave B. (G8KBV/G0WBX)
tricom pod on a stub mast, so I can cheat a bit and angle it south
slightly:-)
It'll take some time to build up a picture of the effect of that but it's
tracking 8 sats at the moment.
Inmarsat-3, PRN120, seems to have joined in the mix now and keeps popping on
and off the bottom of the li
Ok, I give up
I've been logging this with Lady H and was watching again this afternoon as
the sat count dropped but this time there was no dropping into holdover as the
number of sats dropped from four to threedamn, it just carried on doing its
thing until the count went up
as the number increased from two to three.
I can't say that this explains all the holdover events I've seen but it does
seem to explain at least some of them.
Nigel, GM8PZR
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it hit and miss, but I have been seeing holdover
reports every day and with the time building up as the day goes by. The time
never exceeds 5 or 6 minutes though so if it was just being used as a reference
without monitoring the status this could easily go unnoticed.
The LMU300 Location Measur
73
Don
W4WJ
In a message dated 5/10/2018 2:19:49 AM Central Standard Time,
mag...@rubidium.dyndns.org writes:
Hi,
What issues do you have?
Cheers,
Magnus
On 05/08/2018 02:32 AM, Don Murray via time-nuts wrote:
> Hello Time Nuts...
>
>
>
> Who is the resident expert
Hello Time Nuts...
Who is the resident expert on the HP5372A?
I have some operational questions. ;-)
email off list please. w4wj at aol.com
TNX all...
73
Don
W4WJ
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every time in about five minutes. I take the
batteries out to reboot the clock. Otherwise it waits until after midnight to
began searching for the WWVB signal. Presumably the designers felt 60 kHz
noise levels were lower at that time of night.
Bruce, KG6OJI
every time in about five minutes. I take the
batteries out to reboot the clock. Otherwise it waits until after midnight to
began searching for the WWVB signal. Presumably the designers felt 60 kHz
noise levels were lower at that time of night.
Bruce, KG6OJI
contact me off list I have a couple Bert Kehren
In a message dated 5/5/2018 9:17:45 AM Eastern Standard Time,
time-nuts@febo.com writes:
I am trying to use the 60 KHz for synchronization of a Rb receiver. The local
NJ noise and the signal in dBuV are about the same with an active
/2018 4:09:25 AM Eastern Standard Time,
hmur...@megapathdsl.net writes:
Review/background: I have an UltraLink 333 WWVB receiver. It didn't work.
Several weeks ago. a discussion here mentioned that the phone cable between
the main box and antenna needs to be straight through rather tha
there be any value to designing a 24 -> 27.5 volt boost converter that
one could use to power it from a more conventional supply? How much current
would it need?
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and it has problems
>
>
>
>Is there any stock faults ?
>
>What is the life of the rubidium standard?
>
>
>
>Regards Paul
>
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https://ieee-uffc.org/membership/fellows/ieee-fellows-of-the-uffc-society/
Updated list 73 de Ulrich
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and
at no charge online, but the service manual
is very expensive in relationship to the defective counter I purchased several
years ago.
Bruce Hunter, KG6OJI
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superior long-term stability.
Many thanks
Tom Leedy
Clarksburg, MD 20871
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In the April Microwave Journal is an extensive article on a "Ultra-Low Phase
Noise Oscillators with Attosecond Jitter"and measuring techniques.
Bert Kehren
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Can any one get me the HP8640 measured phase noise at 432 Mhz, max output ?
Thanks, 73 de N1UL
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Maybe of interest.here are the measured phase noise data in dB/Hz1Hz 86.3
10Hz 134.49 Hz 100Hz 139.99 1k 140.1 10k 140.1 100k 144.7273 de N1UL
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Attached is a picture of the D/M as we use it. Corby has added things making it
difficult to see. Only thing missing is Offset OCXO.
We have worked off list with some members and have run out of boards. Juerg is
working with a German time nut on fine tuning Riley, just very minor. Boards
will
Attached is a picture of the D/M as we use it. Corby has added things making it
difficult to see. Only thing missing is Offset OCXO.
We have worked off list with some members and have run out of boards. Juerg is
working with a German time nut on fine tuning Riley, just very minor. Boards
will
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re or less)
for the Trueposition units as long as you promise not to make too much
fun of how awful it really is! ;) I am *not* a programmer...just a guy
who wanted to play with Arduino and learn something which I did.
thanks much and 73,
ben, kd5byb
_
Try again... may be of interest ... Ulrich
wenzel crystal oscillator schematic - Google Search
In a message dated 4/15/2018 3:00:46 PM Eastern Standard Time,
time-nuts@febo.com writes:
Good work,
yes, we did not include the fundamental frequency suppressor in the circuit
diagram, we
.
Ulrich
In a message dated 4/15/2018 2:20:22 PM Eastern Standard Time, ka2...@aol.com
writes:
Good work,
yes, we did not include the fundamental frequency suppressor in the circuit
diagram, we needed the oscillator for the evaluation of the test equipment at
the time..
happy Sunday
Good work,
yes, we did not include the fundamental frequency suppressor in the circuit
diagram, we needed the oscillator for the evaluation of the test equipment at
the time..
happy Sunday evening ... Dj2LR
In a message dated 4/15/2018 2:02:01 PM Eastern Standard Time, dk...@arcor.de
world wide.
If interested please send and email directly to me at sandeenpa at yahoo dot
com (Please do not reply on the list.)
Regards,
Perrier
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My 8161/8164 will indicate lock as well, and I suppose they may be
'locked'. But the phase stability is so poor they may as well not be. I
guess it averages out close enough to zero within the time constant to
turn the LED on. It's not new behavior for my units. Phase tracking
rece
t better than a 1000:1 speed
improvement.
Bob
==
With respect, NTP using a GPS/PPS clock can give tens of microseconds or
better, even on a Raspberry Pi. For example:
http://www.satsignal.eu/mrtg/raspi1_ntp.html
(The slight downward slope back over time is an art
t;>
>> If the parts were not as described, still no problems.
>>
>>
>> e-Bay seems to have been more on the side of the Buyer lately. A far cry
>>
>> from their early days when the Seller's word was Gospel.
>>
>>
>> 73, Dick, W1KSZ
Hi, My Spectracom 8161 comparator and 8171A clock are chugging right along in
sync with the proper time. I have only looked at the digital LED output and it
is within one second of my other WWVB clocks. Seems like magic. It came in
synch about two weeks ago and stayed there. I haven't ch
We use Excell nice to make plots and when needed add calculations File is to
large for time nuts contact me direct and I will send you an exampleBert Kehren
Sent from my Galaxy Tab® A
Original message From: CORNACCHIA via time-nuts
Date: 4/10/18 2:35 PM (GMT-05:00) To
List,
the item has been spoken for.
Regards,
Perrier
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.
If interested please send email directly to me at sandeenpa at yahoo dot com.
(please do not reply on the list.
Regards,
Perrier
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Hi, all of a sudden my Symmetricom comparator/clock has been locking up on
time. It has been about a week so far. Did they change the code? Anyone else
seeing that? Doug K6JEY
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Nigel, GM8PZR
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Jürg will have to explain he is in Switzerland will be tomorrowBert
Sent from my Galaxy Tab® A
Original message From: CORNACCHIA via time-nuts
Date: 4/10/18 2:35 PM (GMT-05:00) To: ewkehren via
time-nuts Subject: Re: [time-nuts] Dual GPSDO - any
advantage?
Bert may I
Bert may I ask how you created the charts (what software are you using).Thank
You
On Tuesday, April 10, 2018, 9:04:58 a.m. EDT, ewkehren via time-nuts
wrote:
Looking at the pictures it is the same unit I bought. It is not dual oven bit
trimble works with LH right now shows tracking
How did You Pay for them, I cannot make a payment
On Tuesday, April 10, 2018, 2:01:41 p.m. EDT, W7SLS - Scott Scheirman
wrote:
I ordered 2. We shall see
Scott
No connection with seller(s)
Sent from my iPhone
> On Apr 10, 2018, at 7:13 AM, gandalfg8--- via time-nuts
>
y be in the NTP distribution, or
Meinberg may have a copy. At one time using the QueryPerfomanceCounter call
was an option (look for "QPC"). With Windows-8 and later there is a much
more precise GetSystemTime call which NTP uses.
I played a little with those calls (in a non-serious
Most likely but PayPal will have to get involved since there are more than one
of usBert Kehren
Sent from my Galaxy Tab® A
Original message From: Clint Jay Date:
4/10/18 10:32 AM (GMT-05:00) To: Discussion of precise time and frequency
measurement Subject: Re: [time-nuts
ne?
TIA for your commentsDonald
Brett Collie ZL4GX
PS : I have no connection to the eBay seller. The US$9-50 seems to include
a basic puck antenna, long downlead, and 4 interseries adaptors
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I have run 2 Tbolts from thee same antenna in to my Tracor and see the
corrections are in no way correlated.Bert Kehren
Sent from my Galaxy Tab® A
Original message From: Florian Teply Date:
4/10/18 7:00 AM (GMT-05:00) To: time-nuts@febo.com Subject: Re: [time-nuts]
Dual
Looking at the pictures it is the same unit I bought. It is not dual oven bit
trimble works with LH right now shows tracking 10 satelites.Attached is data
that made me buy a second one for Jürg for $ 129 and one more for me for
$9.50.What you see is highly filtered data to see long time
(GMT-05:00) To: Discussion of precise time and
frequency measurement Subject: [time-nuts] Dual GPSDO -
any advantage?
I`ve just bought two GPSDO`s from China @ US$9-50 each [This is not an
error!] They are stated as being new, and use a Trimball dual oven OCXO. I
plan to run these in parall
There's a "realtime" kernel available for Linux that improves timing - no idea
if this would help in this situation.
See: linux-image-rt-amd64 in debian, for instance
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There is a program for the RPi which handles the PPS input for NTP and can
produce an output on a GPIO pin here:
https://vanheusden.com/time/rpi_gpio_ntp/
but it's user-mode so of limited use. Perhaps the OP could adapt it?
Cheers,
David
--
SatSignal Software - Quality software writt
don't think people should suffer through 141T spectrum analyzers or even a
> 8568- Spend your money an a nice USB unit instead.
>
Blasphemy!
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Hi:
I am looking for the IEEE-488 codes and formats for a Datum 9700AT Programmable
Time System. The 9700AT is a 1U time generator and translator with slots in
the back that can accept option cards with various functionalities such as -488
and RS-232 interfaces, GPIO, and tape searches
Does anyone have any information for the Meinberg (Rode & Schwartz), ED170MP
GPS Receiver?
Thanks
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Can anybody Explain the operation of the chart in Lady Heather especially the
colors what they represent.Thank You
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and follow
Happy to report that problem now resolved by replacing one of the Motorola
Oncore modules with a later version.
Have just ordered another for the secondary channel.
Rob
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How did you measure temperature sensitivity
Bert Kehren
In a message dated 4/6/2018 3:40:18 AM Eastern Standard Time,
hol...@hotmail.com writes:
I replaced the OCXO on one of my Thunderbolts with an Oscilloquartz 8663 and
the temperature sensitivity went down by about 2/3, so I always
in crime Juerg prefers thermo couple and uses Lin. Techn. Ap Note 3
circuit using a LTS 1043. I did a board.
Bert Kehren
In a message dated 4/5/2018 11:45:48 PM Eastern Standard Time,
n2ik...@twcny.rr.com writes:
When considering thermistors be sure to look at the YSI series 400
I respectfully disagree. The OCXO is not the temperature problem with the
Tbolt. It is the DAC. Again this is not a product developed for time nuts it
did an excellent job for its intended purpose. Over a year we worked on the
Tbolt using HP 10811, OSA 8600, FRK Rb, M100 Rb with excellent
No control voltage change of an OCXO in a year is amazing. What is the OCXO
Bert Kehren
In a message dated 4/5/2018 10:52:11 AM Eastern Standard Time,
gerh...@wittreich.org writes:
Bruce,
The link Azelio Boriani shared is the source I used when doing the same
project. Please, post your
work is new
and very old but in its original round container.
Please contact me off list if you think it will work
Bert Kehren
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to cooling system
>> failure).
>>
>> Cooling was done with a closed-cycle gaseous He system, using the
>> Gifford-McMahon cycle. Note that He does not liquefy (at reasonable
>> pressures) until around 4K. All dewars for this kind of work depend on
>> high va
Gary
There is a Blast from the past the PIC TIC. Richard McCorkle did it and in its
time was widely popular. He helped me on many projects so I included his boards
with my board orders. Not being a time nut I never took a closer look at his
board. Having recently revisited the subject for
Question
Using L/H what is too much signal
Bert Kehren
In a message dated 4/1/2018 10:54:23 PM Eastern Standard Time,
david.partri...@perdrix.co.uk writes:
just use a bias tee to feed in the antenna volts :)
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com
I think Bob is right and knows what he is talking about. Example Furuno GT-87,
how many years have I known about it and tried to buy some, just recently
became available.
Bert Kehren
In a message dated 4/1/2018 10:52:50 PM Eastern Standard Time, jg...@zianet.com
writes:
Bob,
If it was a
rements done
by a monitoring service up the coast.
73
Don
W4WJ
In a message dated 3/31/2018 11:04:12 AM Central Standard Time,
k8yumdoo...@gmail.com writes:
I'e always been curious as to why TV stations did not lock at least
their in-house equipment to the network feed as a means to av
Hello all...
One limitation, back in the day, when the network
signal was being passed thru to the local markets...
Many stations used a frame sync to time the network
signal to the local house signal. In other words the
network reference was stripped and retimed to the
house so as to avoid
the displayed date, as it knows that the reported
> date is wrong..
>
> David
>
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of
> donandarl...@gmail.com
> Sent: 26 March 2018 22:18
> To: time-nuts@febo.com
> Subject:
same.
Bert Kehren
In a message dated 3/26/2018 2:23:16 AM Eastern Standard Time, att...@kinali.ch
writes:
On Sun, 25 Mar 2018 15:28:10 -0400
Bob kb8tq wrote:
> Well, magnetic shielding, temperature coupling between cells, photo detector
> noise floor, phase noise of the various sig
Great news for owners of the wonderful old Leitch CSD-5300N master clocks.
Many stations and academic facilities still use these fine clocks as they have
SMPTE time code and impulse out as well as an audio time beep option. They are
still quite valuable on ebay. The dial-up sync option is
w1bkr
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I wonder if Tom Van Baak can help me on this one.
Recently powered mine up for the first time in a few years. Although the
unit survived the original GPS Rollover, it obviously can't cope with the
subsequent one, and is currently showing June 01, 1998 as I type this..
Tom, as you b
egards,
Perrier
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Richard
is that the BCDl DDS sounds familiar, if so there are Cs out there that
need them and can not be found.
Bert
In a message dated 3/20/2018 2:08:39 PM Eastern Standard Time,
w1...@outlook.com writes:
In rooting through my stash, I found a couple of these boards that I picked up
Hello Everyone I need help on on calibrating Time base oscillators for
counters with Lady Heather's Version 5 Can any one help with the setup for
making measurements.
Thank You
On Wednesday, January 26, 2011, 5:56:16 a.m. EST, Achim Vollhardt
wrote:
Luciano,
the fan contr
https://synergymwave.com/articles/2013/04/full_article.pdf
This may be still of interest... happy weekend, 73 de Ulrich, N1UL
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