This watch is not quartz, it is fully mechanical with a balance wheel.
What is the temperature profile of a mechanical balance wheel? That seems
like something at least one time-nut would have good data on.
Graphs of offset vs temperature for crystals are readily available. For the
Colleagues,
My Z3801 has developed a peculiar problem over the last few weeks. Its
been running for several years now (at three different QTHs) and has
worked flawlessly until recently.
The problem is that it seems to oscillate between gps-lock and
holdover. When I checked further it
My (non-chronometer) Breitling A17045 which came back from a service in May is
running at about 1 seconds slow per day over a month (it is about a month since
I last checked against the GPS, and it is about 25s slow).
However I think this is far better than should be expected
Dave
Hi
I also have a sick Z3801. In my case I'm betting it's the Oncore receiver in
it. The symptoms aren't quite the same as yours, but similar.
Bob
On Jul 11, 2011, at 6:22 AM, Ron Hahn (EI2JP) wrote:
Colleagues,
My Z3801 has developed a peculiar problem over the last few weeks. Its been
Hal,
*** REPLY SEPARATOR ***
On 7/10/2011 at 10:12 PM Hal Murray wrote:
4 seconds per day? I'd expected better from a very expensive watch.
Are belts nasty when it comes to keeping good time?
No, it shouldn't have nothing to do with the belts, as they're the same
as
Ron,
My guess would be one of two things...
First check the EFC on the OXCO, if it's near the edge of the tuning range you
might need to adjust the Coarse Adjustment screw to
get it back to near-center of the EFC range.
Second, as Bob said, it could be the GPS receiver (I believe these had
Ron wrote:
Colleagues,
My Z3801 has developed a peculiar problem over the last few weeks.
The problem is that it seems to oscillate between gps-lock and
holdover. When I checked further it seems to be oscillating
between, locked, recovery, and holdover, mostly staying in recovery
and
Dear Ron,
On 07/11/2011 12:22 PM, Ron Hahn (EI2JP) wrote:
Colleagues,
My Z3801 has developed a peculiar problem over the last few weeks. Its
been running for several years now (at three different QTHs) and has
worked flawlessly until recently.
The problem is that it seems to oscillate between
There's a good writeup on accuracy on wikipedia-
http://en.wikipedia.org/wiki/COSC
includes a handy table comparing mechanical movement and quartz movement
requirements.
To be considered a chronometer, the daily rate must be within -4 to +6
secs/day. The stability of the rate over time is more
Been reading the mail and I do use a watch. Not sure if thats good or bad.
But it is indeed amazing how well modern time pieces work.
A $5 Timex with large battery that will run 5 years is a reality.
How accurate is it? Good enough not to worry between time changes.
By the way I also have a number
Hi all,
Just wondering how many people have used John Miles work @
http://www.ke5fx.com/tbolt.htm, or similar, to discipline a rubidium
oscillator and if so...
1. what was the RB of choice ?
2.have any measurements of phase noise etc. been published on such a rig ?
3. Are there any published
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