-Original Message-
From: li...@lazygranch.com
[]
Just a FYI here, using Dave's logging program, I found large errors in NTP
when the antivirus did its thing. I don't know if it was due to CPU activity
interfering with NTP or the cabinet heating up when the antivirus was
running.
http://www.meinberg.de/english/sw/ntp.htm
You can get NTP for windows and also their NTP Monitor.
Free download.
Rob Kimberley
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Edgardo Molina
Sent: 25 October 2012 01:05
To: Discussion
http://www.meinberg.de/english/sw/ntp.htm
You can get NTP for windows and also their NTP Monitor.
Free download.
Rob Kimberley
=
.. with user-oriented install instructions here:
http://www.satsignal.eu/ntp/setup.html
Cheers,
David
--
SatSignal
Hello Magnus,
I know what you're talking about, I'm working for a company specialized in
broadcasting (from studio's to stations to satellites...) and in this world
correct
timing is paramount, we live by the 1/25 second rythm and even less if you
have to sync on a line in the image ;-).
Some
Hi
Judah Levine (probably spelled his name wrong) from NIST has a series of papers
on this. They go back into the 90's.
Bob
On Oct 24, 2012, at 6:47 PM, Magnus Danielson mag...@rubidium.dyndns.org
wrote:
Fellow time-nuts,
When spending time on a conference last week, I heard one
In my experience (in my day job) many / most timing issues with widows pc's and
servers revolve around the sync method breaking (and often the failure not
being detected) rather than accuracy issues when the sync method is working.
As Magnus pointed out authentication methods such as Kerberos
Hi
I have a GR rack mount OCXO of the same vintage. It took a couple of months
to settle to a reasonable aging rate.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Adrian
Sent: Wednesday, October 24, 2012 8:45 PM
To: Time-Nuts
Hi
If you have a divide that's inside the range of the DAC, there are no
nasty spurs (just DAC spurs). Once you are outside that range, there's a
stepped triangle wave modulating the carrier. You get all the sidebands that
you would expect from that very low frequency modulation. If the DAC is
Thanks for that David.
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David J Taylor
Sent: 25 October 2012 09:51
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Timing performance of servers
I have an SR620 that I was preparing to sell. It's been clocked by an
external 10 Mhz source for the whole time I've owned it so I wanted to
verify that the internal VCTCXO was still up to snuff. after CALing
the internal reference I set it up to monitor the output from my Tbolt
and it started
Hi
Chances of finding that in distribution are near zero. Best approach is to
find a part with the same pin out / frequency / supply / EFC / stability on
an auction site. Since it's a 5V / 14 pin DIP that should be possible.
Another simple fix would be a distributor stock miniature VCTCXO and a
K1602TE (note the different part number) oscillators have been sold on
ebay in the past. Keep an eye out there in case more appear. You could
also contact the people who sold them and see if they have one or two
more lurking in the corners.
Other than that, it's just a TCXO that uses the
On 10/24/2012 6:47 PM, Magnus Danielson wrote:
Fellow time-nuts,
When spending time on a conference last week, I heard one interesting
comment that they lost data due to bad timing on their Windows servers.
Now, I know that the standard Windows uses SNTP in order to achieve the
goal of
Hi
If:
1) You are in a reasonable location (good sky view)
2) Don't have a great long cable run ( 50')
3) Are only after NTP time
Then, you can get away with a pretty simple antenna. I likely won't last as
long as a better one out in the weather though. If you shop the auction
sites you can
Look out for TNC connectors and 12v on the Symmetricons!
Don
Bob Camp
Hi
If:
1) You are in a reasonable location (good sky view)
2) Don't have a great long cable run ( 50')
3) Are only after NTP time
Then, you can get away with a pretty simple antenna. I likely won't last
as
long as a
On Thu, Oct 25, 2012 at 9:44 AM, Sarah White kuze...@gmail.com wrote:
Regardless of if I run linux vs bsd vs windows (will be testing multiple
configurations of each, and doing writeups over the next few years as I
test more and learn) I'll need a good external antenna for the new GPS
I'm
The GPS seeing the horizon isn't required. Those satellites are filtered out by
software. The timing GPSs are designed to be less sensitive to the horizon.
-Original Message-
From: Chris Albertson albertson.ch...@gmail.com
Sender: time-nuts-boun...@febo.com
Date: Thu, 25 Oct 2012
Dear Jacques,
Very interesting your studio work and experiences. I bought a year ago a couple
of second hand GPS receivers and Leitch clocks belonging to TV studios and
radio stations so I can imagine a little bit of what you are talking about.
I am interested in sharing the experiences with
On Thu, Oct 25, 2012 at 11:02 AM, li...@lazygranch.com wrote:
The GPS seeing the horizon isn't required. Those satellites are filtered out
by software.
OK, technically it needs to see down to within 10 degrees of the
horizon. But when you are choosing a location for the mast to the
horizon
We used to filter out anything 10 - 20 degs above the horizon when setting
up timing receivers. Typically there's a lot of noise down low (multipath
and tropo effects). As long as you've got plenty of SVs you don't need to go
way down to the horizon.
Rob Kimberley
-Original Message-
The 20 degree cutoff is what I recall the starloc uses as a default. Now I
don't know how important it is to filter those out by the response pattern of
the antenna versus by software.
-Original Message-
From: Rob Kimberley robkimber...@btinternet.com
Sender:
Hi,
Check this one out! I think it might work as long as the +5 volts can
source the oven current required.
Your part was 20ma.
This one requires About 250 ma during warmup and between 80 and 130ma
afterwards.
http://www.ebay.com/itm/310380778466?ssPageName=STRK:MEWNX:IT_trksid=p39
Tom I shifted to 60 Khz using a synth Gen. The 60 Khz for the encoder comes
from another sig gen and they are all locked to an Rb.
Yes thats a sucker price, at least for me.
Regards
Paul.
On Wed, Oct 24, 2012 at 11:05 PM, Tom Miller tmil...@skylinenet.net wrote:
Hello Paul,
I guess you tested
Oh my, that looks like a good deal. I'll have to order a few.
Regards,
Tom
- Original Message -
From: cdel...@juno.com
To: time-nuts@febo.com
Sent: Thursday, October 25, 2012 3:59 PM
Subject: [time-nuts] SR620 VCTCXO replacement
Hi,
Check this one out! I think it might work as
Greetings,
I have been asked the viability of using a vanilla TCXO, with an
accuracy of +/- 0.5ppm (+/- 15 secs per year) that is disciplined
occasionally (perhaps only once a month) with a GPS module. The
application is for an analogue clock, which powers up a GPS module
every so often to learn
Hi
If you want to dig into some papers, the RBXO (rubidium and OCXO) is
essentially the same thing.
Bottom line:
As long as aging + repeated temperature is the dominant effect, it works fine.
As soon as you get a temperature transient - not so much. Worst case is when
the temperature delta
On 10/25/12 11:02 AM, li...@lazygranch.com wrote:
The GPS seeing the horizon isn't required. Those satellites are filtered out by
software. The timing GPSs are designed to be less sensitive to the horizon.
when tracking a satellite above the cutoff, you still want the antenna
to not
If I sent these thoughts before, pardon me as I'm suffering from CRS Syndrom.
Part of the normal work I provide is off-air measurements of
broadcast stations. Would you believe, they pay me to do
this! Anyway, I measure AM carriers, FM carriers, and TV, both
analog and digital pilots, as
I have my 3586b slaved to my Thunderbolt along with a
Flex-1500 radio, Racal-Dana counter, Advantest Spectrum
analyzer and Gigatronics signal generator.
You might be interested to know KEX 1190 in Portland
is about 30 kHz low. At least they aren't spewing
IBOC lately.
--
Chuck Forsberg WA7KGX
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