If you are looking to build your first GPSDO. I'd go with the simplest one
first. I had a goal to build and document one that did not require a
custom PCB or programmed chip or any special test equipment other then a
DMM and a scope with price well under $50. I've beat the price by a lot
but
This might have been mentioned before in the discussions on zero crossing
detection for mains power monitoring (apologies if I missed it) but this chip
(or series thereof) looks interesting -
http://www.eejournal.com/archives/articles/20140409-tinyterror/
and the article is fairly amusing
On Tue, Apr 15, 2014 at 10:09 PM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
[]
Even 1 PPS output seems like a workable starting point, but at the
expense of a different and/or more difficult path to get to a 10 MHz
reference signal I seek.
Any advance or pointer to source
Hi,
I´m using it with last agilent library and it work fine with my 34401a
multimeter.
The idea is to use timelab with hp5335a and hp5370b to measure my reference
oscillators.
Since I use windows 7 enterprise x64 I try the visa drivers from NI also
with same result.
I try again with windows
Tom,
can you explain what exactly you understand by a large coil of wire?
Did you make the easurements on the Junghans with a DIY sensor or with one
of the commercially available?
I have made some basic tests with a coil coming from a loudspeaker's cross
over network. It has a few hundred
On 4/15/14, 8:16 PM, nuts wrote:
I don't use the surf board resin. I use
http://www.tapplastics.com/product/fiberglass/polyester_resins/tap_marine_vinyl_ester_resin/34
I don't have specifics on what Tap sells, but vinyl ester resins have a
dielectic coeficient around 4 and dissipation of at
http://www.adafruit.com/blog/2014/04/16/first-atomic-clock-wristwatch-the-hewlett-packard-5071a/
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Re: Trak Systems
If you wish to use the reader function, you will need a source of IRIG B time
code (1KHz carrier). Switch the front panel switch to Read and connect the
IRIG code to the CODE IN BNC. If you wish to use it as a generator, switch the
front panel switch to GEN, preset the time
From: Chris Albertson
I'm using (most of) the circuit posted a few weeks ago to this list by Lars
Walenius. I posted the code here a week or so ago. I was impressed by
how simple his GPSDO was and have sense simplified his design even more.
The goal was not state of the art performance but an
Guys, someone somehow hacked my address book and has been going through it
slowly and sending spam in my name. Please do not open the attachments or links
if you get a link from me.
Sent From iPhone
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To
A question to the math time-nuts
With the values of K1, K2 K3 constant,
and the initial state of I#1, I#2 and Last_Input all zero
assuming there is no rounding, clipping or overflow in the math
and that if I've made any obvious dumb typo errors that they are corrected,
Given this PID type of
http://www.adafruit.com/blog/2014/04/16/first-atomic-clock-wristwatch-the-hewlett-packard-5071a/
Yes, that photo of my brother-in-law is always a top hit on my web site.
I can barely lift a 5071A with two hands.
http://leapsecond.com/pages/atomic-bill/ a real man
The first sensor I'd think of if I wanted to measure a wrist watch would be
a microphone. Listen for the tick. You'd need a good quality
preamplifier. Place the watch directly on top of the microphone then the
mic in a closet with a blanket on it.
Good quality studio microphones are very,
I just did an experiment. Place a simple quartz movement wrist watch on
top of a Fender Stratocaster guitar. I get a very strong and easy to
detect signal. A loud and sharpt ping once per second. More then 1 volt
peak to peak. I can cancel almost all the background hum and hiss in the
normal
What are these wrist watches of which you speak? I saw some old geezer
wearing some sort of clock bracelet a few years ago. Are they similar? ;-)
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To
Tom:
I saw you post to David on the Time Nuts list offering availability of a
Thunderbolt.
If you have additional units available I would be interested in one as
well.
Let me know if you have any available and the cost.
Thanks,
Mike George
N3MUY
On 4/15/2014 14:03, Tom Van Baak wrote:
It does not take a large pickup coil to pick up the magnetic field of a
quartz watch movement tick.
Radio Shack used to sell suction cup telephone pick up coils but I doubt
they have them anymore. These piggybacked on a phone receiver. They are
still out there,
I have a Timex watch that's probably seven or eight years old. It has an
LCD readout. The buttons haven't worked in years. It looses about one second
every three or four months. I have to take out the four microscopic screws
in the back to get into it to set it. The only reason I hang onto
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