On 21 Nov, 2012, at 10:34 , Michael Tharp wrote:
> With respect to interrupt latency, the PPS driver is the best you're going to
> get without a custom add-in card that provides input capture (timestamping).
> I considered going that route but making PCI or PCI-e cards essentially means
> usin
The XC2C64 has 64 cells and the XC9572 has 72. I recommend to choose
something larger when buying evaluation boards: just in case you think to
go beyond the PPS divider and think to put in also a time interval counter.
Going from the PPS divider to the basic hardware that can make your GPSDO
is a v
On Tue, 20 Nov 2012 16:13:51 -0500, EWKehren-YDxpq3io04c wrote:
> I did mention a MAX 3000 implementation of a 1 pps generator. The
> attached picture shows the prototype. This came about to generate timing
> signals to test the counters. It is a TADD-2 Mini on steroids. Besides
> the Wenzel input
The -48V RTN should be the 'positive' side and the POWER -48V should be
the 'negative' side. On normal installations the -48V is a black wire,
the -48V return is a red wire. It's like having a 'positive ground'.
(I've used, manufactured, sold, and installed 48V Telco gear.) On most
Telco gear b
-Original Message-
From: Michael Tharp
[]
What you have is probably better than the typical RS-232 DCD line.
Ultimately it's doing the same thing with mostly the same code --
triggering an interrupt when the line changes, and timestamping that in
the kernel to keep the slippage between
On 11/21/2012 04:11 PM, Michael Tharp wrote:
On 11/21/2012 06:58 AM, Magnus Danielson wrote:
It was a common mode error to both servers. It's worth nothing that even
a high-ranked clock house like USNO can have these errors so trusting
the one and true server can fail greatly. NTP by it's design
On 11/21/2012 06:24 AM, David J Taylor wrote:
I only use gpsd on the Linux system, and then only because it was the
first thing I discovered when searching with Google. As the precise
timing is from the PPS signal fed to the GPIO pin, with a GPIO interrupt
handler, I am forced to use that. I do
On 11/21/2012 06:58 AM, Magnus Danielson wrote:
It was a common mode error to both servers. It's worth nothing that even
a high-ranked clock house like USNO can have these errors so trusting
the one and true server can fail greatly. NTP by it's design has methods
to handle these kind of errors gi
Measure both pins and see if 1 is grounded.
Telco is indeed -48V. So I would expect hopefully to see pin 8 at close to
0 ohms. If so then the plus of the 48 V would connect here and the label
is explicit.
But what I have run into is that nothing connects to ground and as such
whats minus is a guess
Hi
If you have any concern about the wiring of the unit - open it up and check.
There are an enormous number of conflicting wiring options for the small FE
rubidiums.
Bob
On Nov 21, 2012, at 5:50 AM, Fabio Eboli wrote:
> Hello,
> I have a pair of FE-5682A coming,
> not that I need them, but
Hi
I found that I was past the network analyzers 120 db floor with two stages at
10 MHz.
Actually the reactive termination thing is a bit of a "maybe yes / maybe no"
sort of thing. It seems to help with some setups and not with others. What does
work just about always is to terminate the mixer
Quoted message:
8<---
Sent: Tuesday, 20 November, 2012 09:38
To: na...@nanog.org
Subject: Re: NTP Issues Today
[]
If your machines switched dates yesterday it probably means you're
NTP infrastructure is insufficiently peered and diversified.
--->8
Thank you, Peter and Paul.
Now I see that the pinout is almost identical
to LPRO-101, the only difference are pins
8 and 10 for power supply.
That's nice, I like the external C-Field control,
and monitor voltage for lamp, they can be useful.
I'm not familiar with telco power supplies,
I know only
I would agree that it sounds like you have a -48 telco unit. Thats pretty
easy to do as some form of an option or alternate. But I have no proof.
Regards
Paul
On Wed, Nov 21, 2012 at 7:28 AM, Peter Bell wrote:
> I'm not familiar with that unit, but the pinout appears to match the
> Efratom LPRO-
I'm not familiar with that unit, but the pinout appears to match the
Efratom LPRO-101 with the exception of the power supply.
On the LPRO, pin 8 is the -ve side of the 24V supply and pin 10 is the
+ve side. The "19V to 32V, 24V nominal" spec also matches the LPRO.
It's possible that there is mor
Yep. You are right. May help only in the serial data... And irrelevant.
Doc
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On 11/21/2012 03:50 AM, Bob Smither wrote:
Anyone notice this?:
https://isc.sans.edu/diary.html?n&storyid=14548
Seems a Navy NTP server claimed it was year 2000 for a while.
Qouted message:
8<---
Sent: Tuesday, 20 November, 2012 09:38
To: na...@nanog.org
Subject: Re: NTP Issues Today
In a
-Original Message-
From: Bill Dailey
Very nice write up. I went down a similar road with my fury and Ubuntu...
And then with FreeBSD on a soekris box. Have you tried refclock drivers
instead of gpsd? I use gpsd on Ubuntu but decided to use refclock route
instead for FreeBSD. I hav
Hello,
I have a pair of FE-5682A coming,
not that I need them, but I had flat
shipping from the seller freakyflickers
on ebay fro another item, I was asked 14USD each.
I'm a bit confused by the pinout on
the datasheet:
http://www.ko4bb.com/Manuals/05)_GPS_Timing/FEI/FE-5682A_Datasheet_REVB.pdf
T
Have achieved around 120db with 3 cascaded 2N3904 CB amps.
Something like a BFQ18 broadband transistor with its built in emitter
ballasting may be a better choice.
They work well in a pushpull CB Norton transformer feedback amp to boost
the +7dBm output of an OCXO to +19dBm.
Unfortunately Nort
Very nice write up. I went down a similar road with my fury and Ubuntu... And
then with FreeBSD on a soekris box. Have you tried refclock drivers instead of
gpsd? I use gpsd on Ubuntu but decided to use refclock route instead for
FreeBSD. I have an overall feeling that at us and ns levels gp
Yes, Two of my PC's asked if I wanted to change the data and time to -8xxx
days, 0 hours, 0 minutes, 0 seconds. A real head scratcher until I saw the
link below. I believe the time server was tick.usno.navy.mil
The Time Sync software that I use is D4 - see:
http://www.thinkman.com/dimension4/
-Original Message-
From: paul swed
Sent: Tuesday, November 20, 2012 9:34 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] eBay Ublox
any luck on the ntp server?
==
If it's me you are asking, yes, Paul, here's th
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