Hi, this is my first post ever to a mailing list, so if I'm doing
anything wrong please be gentle with your corrections :-)
A short time ago I purchased a Nortel/Trimble NTGS50AA GPSTM, I'm sure
many on this list are familiar with it. At the time of purchase, my only
interest was the 10 MHz
Gerhard ,
Which firmware version are you running in the 2100? We never updated to the
most recent due to the leap second thing. We do have the various firmware
versions on disk.
Andrew
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Gerhard
Hi Matthias - It sounds like you may have a temperature sensitive component (or
solder joint?).
Perhaps cooling each component individually will help you find the problem.
Regards, John K1AE
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Matthias
Do you think it is OK to consider a pulse which arise 250 ns early to be close
enough?
For NTP usage that will be no problem whatsoever.
Dave
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On Wed, Jun 10, 2015 at 6:30 AM, Ed Armstrong eds_equipm...@verizon.net wrote:
Hi, this is my first post ever to a mailing list, so if I'm doing anything
wrong please be gentle with your corrections :-)
Welcome!
[snip]
My next step was to find out where the even second pulse entered the
From: Ed Armstrong
[]
OK, here is the actual question. Do you think it is OK to consider a
pulse which arise 250 ns early to be close enough? And no, I am not
forgetting about that 3 ns, there is about 3 ns of delay added by the
output circuitry.
Hope you didn't mind the long-winded post, and I
For driving NTP..
1) NTP works in microseconds and your networked clients will see accuracy
in the range of a few milliseconds.
2) There is a way to fix this in NTP's configuration file, you can specify
what the delay is.
On Tue, Jun 9, 2015 at 9:30 PM, Ed Armstrong eds_equipm...@verizon.net
Thanks for all of the replies, very useful. Also for the recommendations on
the 74LVC1G74 and 1G80. I don't know why I didn't check for a 7474 in this
technology, of course they would have that available. But it looks like the
1G80 will do just exactly what I need in a smaller package, so I think
I'm throwing my hands up in the air - I don't have the time to wrestle my
silly mac into trying to talk to the box, unless someone has quick advice
on something I might be doing wrong.
z3801a, jumpered to RS232, modified with an internal switching power supply
(see photos below). Power light
Hi Ed --
For standard PC hardware, 250ns is way under the interrupt granularity
of the computer, and will never be noticed. Some specialized
configurations (https://www.febo.com/pages/soekris/) have timer
resolution to a few hundred nanoseconds, but that takes hacking.
I know there have
Hi Ed,
I am the one who discovered the 1PPS pulse while troubleshooting a
NTG550AA. Instead of reuse the 1/2 PPS output and missing this signal,
my plan is to recycle the 9.8304 MHz output circuitry and connector, the
circuits are almost identical. So I will cut the trace that goes from
Ed, first of all, welcome to the mail list! I have been lurking here for some
time now and wanted to try an apply what I have learned about NTP to your
question. I, too, haven't posted on here before, so please forgive me if I
have quoted his question wrong, and replied incorrectly.
I
On Wed, Jun 10, 2015 at 12:30 PM, Ed Armstrong eds_equipm...@verizon.net
wrote:
OK, here is the actual question. Do you think it is OK to consider a pulse
which arise 250 ns early to be close enough? And no, I am not forgetting
about that 3 ns, there is about 3 ns of delay added by the output
Hi
Welcome!
At best your NTP setup will be good to a few microseconds. By the time you get
the time delivered (even over a LAN) it will be good to a few hundred
microseconds at best. The ~ 250 ns error should not be a big deal.
This being Time Nuts, you might take a look at the options on
alan.ambr...@anagram.net said:
How about a 1pS resolution TIC? :)
An alternative way to describe that sort of problem is
How accurately can you locate an edge?
I haven't looked carefully at the Spartan 3E. You might be able to run a
signal along a column through a slow path and clock the
Sorry, this sheet has the last page with pin-outs.
http://www.ko4bb.com/manuals/50.158.136.69/MTI-240-0530-D.pdf
greg
On Jun 10, 2015, at 11:55 AM, Gregory Beat w...@icloud.com wrote:
Did someone ask about the MTI-240-0530-D Oscillator Specification?
AT crystal cut, found on this spec sheet
On Tue, June 9, 2015 11:30 pm, Ed Armstrong wrote:
OK, here is the actual question. Do you think it is OK to consider a
pulse which arise 250 ns early to be close enough?
It is only 250ns early relative to the even second output. What is the
even second output referenced to?
What most people
Try going through all the speeds starting at 300. Sounds like a baud rate
mismatch to me from the symptoms
Also try 8 bits 1 stop no parity
Content by Scott
Typos by Siri
On Jun 10, 2015, at 10:28 AM, David Andersen d...@pobox.com wrote:
I'm throwing my hands up in the air - I don't
Hi
Normal drill for this sort of thing:
1) First connect the serial dongle back to back (output to input) and make sure
it gives you back what you type in. If not, find another dongle.
2) Check the output levels from the Z3801 with a scope. It should be swinging
at least
+/- 5V and more like
David,
Using a USB dongle with an Apple Mac Laptop works fine for me.
The chip is a FTDI FT232BL.
Drivers from the FTDI site.
In terminal or console use one of the following commands:
[generic $5 dongle with no serial number]
cd /dev
screen tty.usbserial
[xs880 with a serial number,
Hello!
Does anyone have firmware for one of these? I have one that is stuck on the
loading OS screen. Perhaps I need clones of either the CF card or Micro SD
card socketed inside the unit. Perhaps any experience with this symptom?
They made one with a Rb, but I don't see where it would fit
eds_equipm...@verizon.net said:
OK, here is the actual question. Do you think it is OK to consider a pulse
which arise 250 ns early to be close enough? And no, I am not forgetting
about that 3 ns, there is about 3 ns of delay added by the output
circuitry.
If you want to earn your
HI
On Jun 10, 2015, at 3:28 AM, Hal Murray hmur...@megapathdsl.net wrote:
alan.ambr...@anagram.net said:
How about a 1pS resolution TIC? :)
An alternative way to describe that sort of problem is
How accurately can you locate an edge?
I haven't looked carefully at the Spartan 3E.
kb...@n1k.org said:
2) Check the output levels from the Z3801 with a scope. ...
A quick power cycle between each of the 9 possibilities should get it
feeding out something that you can recognize. Yes this is a generic
approach, but sometimes the generic one is quicker than doing a bunch of
Both Wenzel 500-07078 oscillators have been paid for and shipped.
Thank you time-nuts members.
Ivan Cousins
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