On Tue, Jun 9, 2015 at 11:40 AM, Alan Ambrose alan.ambr...@anagram.net wrote:
How about a 1pS resolution TIC? :)
Or a 12 digit frequency counter? :) :)
It's not a proper time-nut project unless there's a nutty element...
Well, how complex? Front end with a fast ADC and make a DSP DMTD
Hi
Be careful of “single source” comparisons. When running with one reference,
NTP is really measuring the reference against it’s self. It’s analogous to
using a
frequency counter to check it’s own reference. It *does* indeed check a number
of things.
It’s not really checking everything.
An
Hi
Depending on which chip you are using and how big it is, you can get into the
150 to
500 ps range running a carry chain as a TDC.That’s without getting into things
like
hand routing and temperature / voltage issues.
How big a chip you need will be a function of how high you can get the
Does anyone have v4.1 of the firmware for the 2100 they wouldn't mind
sending me?
With the new Heol GPS receivers on the way I would like to test it on
the different firmware versions but I can only seem to find my v3.1.
Respectfully,
Sean Gallagher
Malware Analyst
571-340-3475
Hi Ed,
I have started another thread under the name NTG550AA 1 PPS mod for
finding the subject easier and I include here my thoughts about this
modification.
I am the one who discovered the 1PPS pulse while troubleshooting a
NTG550AA. For me I don't imagine any future use of the X8 Chip
Sean,
I have it (but not with me) and can send it directly to you this evening.
I will also gladly post if anyone else is interested.
Gerhard R Wittreich, P.E.
On Thu, Jun 11, 2015 at 9:38 AM, Sean Gallagher s...@wetstonetech.com
wrote:
Does anyone have v4.1 of the firmware for the 2100 they
Thanks for the suggestions!
It turns out the answer was my serial dongle was failing.
*head bonk* I swapped it out for another FDTI-based dongle and suddenly
there's a happy working z3801a.
Before I throw it on eBay, would anyone like a working (yay!) z3801a
modified to take mains power?
Hi Bob, yes I'm including several other sources and usually about 3 are
getting included in the discipline of the local clock. Here is my ntpq
-pcrl output at the time I wrote this message.
pi@raspi2 ~ $ ntpq -pcrl
remote refid st t when poll reach delay offset
jitter
Where on the planet are you? I'm in UK so if you are in USA shipping will make
it uneconomic.
Regards,
David Partridge
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David Andersen
Sent: 11 June 2015 21:39
To: time-nuts@febo.com
Subject: Re:
Here is what I have been able to do with a Motorola Oncore UT+ that I got
from Bob Stewart awhile back. This is with a Raspberry PI 2 with a number
of tweaks and a custom compiled kernel. Nothing too drastic... plus the
current Dev version of NTP compile on the Raspberry PI. I'm getting better
Hi
Comparing a GPS to a series of “over the net” sources will always make the GPS
look
good. NTP is usually smart enough to figure out that the GPS is the one it
wants and lock
in on it.
The ppm’s at the bottom are talking about the software PLL and how it’s offset
from your
computer’s
I modified one of my 3801s by placing a home brew linear power supply in it and
a regular 3 connector AC plug in place of the 48 volt one. The power supply
with the transformers was a tight fit, but I managed. It has been working fine
for about 12 years. I also replaced the solid top cover with
Hi,
So that turns into 2 games:
How fast can you count?
How many digits can you get in 1 second?
A clever interpolator for frequency or TIC would kill it - for TIC essentially
a PICTIC on steroids. The PICTIC does 19pS with a 10 bit ADC and a 66MHz clock,
an SR620 does 4pS with a 12 bit
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