I recently bought a pair of FEI FE-5680A Rubidium Frequency Standard
units on ebay (best offer of $150 for 2, free shipping from Hong Kong -
seller tortlex2). It was relatively cheap (compared to EFRATOM units 10
years ago), compact and modern (programmable DDS), perhaps even useful to
Most if not all Citizen ecodrive watches are disciplined by 60hz light flicker
that average
the 60hz light flicker over approximately 10 days before a rate adjustment is
preformed.
I have four citizen ecodrives;
Plain jane quartz analogue ecodrive with mechanical calendar that is 60hz
Do they detect the light flicker or the ambient ac field. Light flicker is
120 Hz.
Very interesting,
John WA4WDL
--
From: tom jones epoch_t...@yahoo.com
Sent: Wednesday, April 20, 2011 9:43 AM
To: time-nuts@febo.com
Subject: [time-nuts] 60hz
I wonder if it's smart enough to have a sanity check to determine
whether the line frequency is 50 vs. 60 Hz?
BTW -- I have an Ecodrive watch, but it's radio controlled (as well as
solar charging), so haven't seen any reference to this setting method
before.
John
On 4/20/2011 10:13
Le 20/04/2011 16:17, John Ackermann N8UR a écrit :
I wonder if it's smart enough to have a sanity check to determine
whether the line frequency is 50 vs. 60 Hz?
BTW -- I have an Ecodrive watch, but it's radio controlled (as well as
solar charging), so haven't seen any reference to this
Thats what I also thought though did not plan to test it.
As for mains stability. They are indeed stable over time weeks and months
and are corrected. This was a use case for numbers of the austron clocks and
freq references.
Plus the frequency accuracy is needed for inter-tie networks and power
In message banlktimuxps8gbxp99ra8ijzvheotp8...@mail.gmail.com, paul swed writ
es:
Thats what I also thought though did not plan to test it.
As for mains stability. They are indeed stable over time weeks and months
and are corrected.
Are you sure ?
Here in europe that was lost in the
On 4/20/11 8:26 AM, Poul-Henning Kamp wrote:
In messagebanlktimuxps8gbxp99ra8ijzvheotp8...@mail.gmail.com, paul swed writ
es:
Thats what I also thought though did not plan to test it.
As for mains stability. They are indeed stable over time weeks and months
and are corrected.
Are you sure ?
Hi Poul-Henning,
On Wed, 20 Apr 2011 17:26:15 +0200, Poul-Henning Kamp p...@phk.freebsd.dk
wrote:
In message banlktimuxps8gbxp99ra8ijzvheotp8...@mail.gmail.com, paul
swed writ es:
...
As for mains stability. They are indeed stable over time weeks and
months
and are corrected.
...
On 4/20/11 8:53 AM, Jim Lux wrote:
On 4/20/11 8:26 AM, Poul-Henning Kamp wrote:
In messagebanlktimuxps8gbxp99ra8ijzvheotp8...@mail.gmail.com, paul
swed writ
es:
Thats what I also thought though did not plan to test it.
As for mains stability. They are indeed stable over time weeks and
In message 4daf0b0d.4080...@earthlink.net, Jim Lux writes:
I found this in a generator interconnection agreement:
This frequency response control shall, when enabled at the direction of
CAISO, continuously monitor the system frequency and automatically
reduce the real power output of the
On 04/20/2011 05:26 PM, Poul-Henning Kamp wrote:
Are you sure ?
Here in europe that was lost in the privatization of the grid: Nobody
was charged with paying for the extra power needed to capture lost
cycles, so now they just try to keep it close to 50.0Hz and don't
care about the
On 4/20/11 9:39 AM, Poul-Henning Kamp wrote:
In message4daf0b0d.4080...@earthlink.net, Jim Lux writes:
I found this in a generator interconnection agreement:
This frequency response control shall, when enabled at the direction of
CAISO, continuously monitor the system frequency and
On 4/20/11 9:44 AM, Kasper Pedersen wrote:
The mainland Europe grid (which you are not on, I know..) looks like this:
http://n1.taur.dk/grid/plt.png
http://n1.taur.dk/grid/pltw.png (very large with grid)
y axis is phase in seconds, x axis is time
The plot is 130 days long, 60sec/130d= 5ppm
Group,
Google can't find anything for citizen ecodrive watch time sync 60 hz
except a few where the k was left out of 60 khz. All of the watches
that synched received WWVB at 60 KHz.
The claim of 13 millisecond accuracy from line frequency is suspect. There
is no control of the power grid to
The confusion is understandable. There are so many different variants of
the FE-5680A, and they are not easy to identify.
Some of the information you see out there is from folk who measure the
voltage on the pins with a meter, not understanding what they are
looking at. When I've investigated
On Wed, Apr 20, 2011 at 10:00 AM, Jim Lux jim...@earthlink.net wrote:
On 4/20/11 9:39 AM, Poul-Henning Kamp wrote:
In message4daf0b0d.4080...@earthlink.net, Jim Lux writes:
I found this in a generator interconnection agreement:
This frequency response control shall, when enabled at the
I know that several list members have bought FE-5680A rubidiums. Of
all the various ebay sellers that you have bought this model from, who
would you recommend? If I wanted a straight 10MHz unit vs a frequency
agile unit, would you recommend a different seller?
Joe Gray
W5JG
On Wed, Apr 20, 2011
Joe,
If all you need is a fixed 10MHz source, you might be better getting an
Efratom LPRO-101, which are available from the same sources. The
LPRO-101 doesn't need a heatsink, and does not have the confusing array
of different versions and options that the FEI units suffer from.
As for suppliers,
On 4/20/2011 3:02 PM, Murray Greenman wrote:
Joe,
If all you need is a fixed 10MHz source, you might be better getting an
Efratom LPRO-101, which are available from the same sources. The
LPRO-101 doesn't need a heatsink,
Not so Murray, it really does need one, similar to the FEI.
and does not
I downloaded the HP 5372A ROM images from Dieder's site, programmed them into
27C010's, installed them on a 5372A CPU board... no joy. System does not
boot. The status lights on the CPU board flash for a while, then stop with
the left three LEDs lit.
I tried the W9 ROM size jumper in
My recollection of reading the LPRO-101 Manual is that there is a
requirement for a heat sink for continuous operation to keep the baseplate
less than 70 degrees C. It is OK to turn it on for 4 or 5 minutes to make
sure it 'locks' but, IIRC, there is a specific specification for a heat sink
with
On Wed, Apr 20, 2011 at 9:20 PM, Mark Sims hol...@hotmail.com wrote:
I downloaded the HP 5372A ROM images from Dieder's site, programmed them
into 27C010's, installed them on a 5372A CPU board... no joy. System does
not boot.
The status lights on the CPU board flash for a while, then stop
This looks good!
http://www.ablogtoread.com/citizen-satellite-eco-drive-watch-gets-time-from-space/
At 21-04-2011, you wrote:
Group,
Google can't find anything for citizen ecodrive watch time sync 60 hz
except a few where the k was left out of 60 khz. All of the watches
that synched received
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