csteinm...@yandex.com said:
That one is not ideal for this task, because (i) its output pulse is
symmetrical about the mains zero cross, and (ii) the hysteresis zone is not
well characterized and will drift with temperature and input voltage. So,
there is no edge that is well characterized
Hi everyone,
The past couple of weeks or month it seems we've had a lot more traffic than
usual.
This is a reminder that there are 1300 of us and we look forward to rich
content on this list.
Postings that have little technical content, or are based on guessing, or are
just one-liners, or
Hal wrote:
What are you going to do with data from the line accurate to 1 microsecond?
Me? Nothing. I don't find the meanderings of the mains frequency
all that interesting, aside from observing them from time to time via
the sweep second hand of a synchronous wall clock. But lots of
Hi
On Dec 16, 2014, at 11:03 PM, Charles Steinmetz csteinm...@yandex.com wrote:
Bob wrote:
The Collins paper on hard limiters does indeed apply here. You *could* make
a 60 Hz chain that got down into 1 us sort of resolution.
I don't know how much less than 1uS you mean by , but I was
HI
On Dec 17, 2014, at 1:07 AM, Chuck Harris cfhar...@erols.com wrote:
I would venture that the extent of the magic was to note the physical
center of the array, and call that the phase center.
As long as you always orient the antenna in the same direction, any
errors that might exist in
Hi
On Dec 17, 2014, at 3:27 AM, Hal Murray hmur...@megapathdsl.net wrote:
csteinm...@yandex.com said:
That one is not ideal for this task, because (i) its output pulse is
symmetrical about the mains zero cross, and (ii) the hysteresis zone is not
well characterized and will drift with
Not sure if this is quite the right platform, but for someone wanting to
experiment it may be worth a look...
https://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-receiver
http://www.swiftnav.com/piksi.html
Dan
Date: Tue, 16 Dec 2014 16:01:28 -0800
From: Jim
On 12/17/14, 4:36 AM, Bob Camp wrote:
HI
On Dec 17, 2014, at 1:07 AM, Chuck Harris cfhar...@erols.com wrote:
I would venture that the extent of the magic was to note the physical
center of the array, and call that the phase center.
As long as you always orient the antenna in the same
On 12/17/14, 5:20 AM, Dan Kemppainen wrote:
Not sure if this is quite the right platform, but for someone wanting to
experiment it may be worth a look...
https://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-receiver
http://www.swiftnav.com/piksi.html
from that page:
3-bit, 16.368
Seems to me CFLs and other loads switching on and off would affect the
60 Hz waveform
enough to make microsecond measurements meaningless.
On 12/17/2014 01:03 AM, Charles Steinmetz wrote:
Hal wrote:
What are you going to do with data from the line accurate to 1
microsecond?
Me? Nothing.
I have searched to no avail.
Has anyone a pointer to a real manual for the Z3812A / KS-x devices?
cheers, Graham ve3gtc
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Did a test for a while: every 5 minutes I would look at the output of
ntpq -c pe -n for jitter of the pps source.
This pps source was measured either in the kernel (this newly added
gpio pps support in the raspberry pi) or in user space using my own
rpi_gpio_ntp.
kernel pps interrupt handling
On Wed, Dec 17, 2014 at 10:56 AM, folkert folk...@vanheusden.com wrote:
Did a test for a while: every 5 minutes I would look at the output of
ntpq -c pe -n for jitter of the pps source.
I have some interest in various ntp comparisons but it's not really
time-nuts material.
Would you be
On 12/17/14, 6:46 AM, Chuck Forsberg WA7KGX wrote:
Seems to me CFLs and other loads switching on and off would affect the
60 Hz waveform
enough to make microsecond measurements meaningless.
folks measure the frequency to tenths of a Hz (albeit not a single cycle)..
0.1 Hz out of 60 Hz is 27
On Dec 17, 2014, at 1:38 PM, Jim Lux jim...@earthlink.net wrote:
but there probably are some software receivers (open source?) out there..
I'll add to the list:
Fellow time-nut Peter Monta's GNSS Firehose
http://pmonta.com/blog/2014/06/17/new-gnss-firehose-board/
Hi
Since the box was only made for Lucent, it’s a good bet that there is no formal
manual. There may be a spec sheet or something in a non-manual format.
For right now, the best bet is to grab the Z3801 manuals that are out there.
The boxes are similar enough that the info in one sort of
Hi
On Dec 17, 2014, at 8:49 AM, Jim Lux jim...@earthlink.net wrote:
On 12/17/14, 4:36 AM, Bob Camp wrote:
HI
On Dec 17, 2014, at 1:07 AM, Chuck Harris cfhar...@erols.com wrote:
I would venture that the extent of the magic was to note the physical
center of the array, and call that the
I keep a VMware image file with a very old copy on Windows on it
just for old programs like this. The image file will boot up on a
Mac or Linux machine or even in a Win 7 PC. I keep thinking it would
be good to re-write LH so it would run on a more reasonable/modern
platform but there are about
Ed,
On 11/15/2014 04:38 PM, Ed Palmer wrote:
Yes, I'm sure. I did check the cabling. :) If I was somehow measuring
the Tbolt or 4065A against itself, there wouldn't be any frequency offset.
The Oscilloquartz 3210 (which appears to be an OEM'd 4065A) is spec'ed
at 3E-13 @ 100K seconds. The
19 matches
Mail list logo
