Without wanting to show my ignorance by confusing accuracy, and precision,
etc, would some kind person please answer the following : Let me explain -
I have my prototype GPS diciplined [ Trimble inside] standard frequency
source connected to both a divide by 5,2,5 and 2 producing all the
reference
good info Rick
ROY - I have spiced up in LTSPICE a doubler and 4 harmonics which you
can vary the amplitudes of the harmonics in the current sources I1, I2,
I3, I4. There is a basic tank circuit on the output which you can
connect/ disconnect etc.
www.cortexrf.com.au/5_meg_doubler.asc
> If I live another 100 years [Let`s say I take antioxidants ;-) ] what sort
> of error should I expect in this clock? [I know that it`s better than 1
> second per day]
You didn't say anything about skipping leap seconds.
Ignoring that part, and assuming you have a good antenna, and assuming
I am in some ways a beginner also. But here is one way to calculate error.
Figure the number of seconds in 100 years. You just compute the number in a
minute (60) times the minutes in an hour (60) times the hours in a day (24) and
so on. When you get to 100 years after all the
Somewhat tongue in cheek, from another relative beginner:
There are also several seconday effects you will need to consider over the
next 100 years:
-- Do you have a way of changing the battery in the clock without it
stopping?
-- Will the $10 clock's bearings last 100 years?
-- If the 1 pps
Hello to the group drift won't be the issue. Power outages will. That type
of disruptive issue.
>From the analog clock guy. Use 4 on the wall for different time zones. All
synced... Also battery backup. But every now and then we get big outages
and lightning storms. Thats what gets the clocks.
Does anyone have HP5370B that is working well for sale? I am in Central
Florida USA. Please respond to me off list with your offer.
---
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
___
time-nuts mailing list --
Jim
Boy did you actually hit the issues.
I have run into all of them. The bearings are a real issue.
I have one clock I need to pull down and lube. Pain in the butt.
Regards
Paul
On Fri, Jul 19, 2019 at 9:20 AM Jim Harman wrote:
> Somewhat tongue in cheek, from another relative beginner:
>
>
I absolutely loved mine.
Until that input chip went.
:-(
On Sat, 20 Jul 2019 at 00:01, Taka Kamiya via time-nuts <
time-nuts@lists.febo.com> wrote:
> Does anyone have HP5370B that is working well for sale? I am in Central
> Florida USA. Please respond to me off list with your offer.
>
>
You might want to consider an LED digital wall clock. I have a homebrew LED
clock that's going strong after some 46 years of continuous 24/7/365 operation.
The MM5314 is even a packaging reject unit I grabbed when it was a brand new
design and I was a mere co-op engineering student working at
For curiosity sake, this sounds like it is a Master Clock > Slave Clock
system.
Are the slave clocks DC Impulse driven or do they have AC synchronous
gearbox motors which then correct on/near the hour every 12 hours?
For instance at 6 O'clock twice a day on let's say the 58th minute?
You want
There are some ideas for long-lived clock mechanisms here :
http://longnow.org/clock/
On Fri, Jul 19, 2019 at 5:00 PM Robert LaJeunesse
wrote:
> You might want to consider an LED digital wall clock. I have a homebrew
> LED clock that's going strong after some 46 years of continuous 24/7/365
>
Hi
The simple answer is that your clock is locked directly to a set of time
sources built
into the GPS satellites. Those sources are corrected by ground stations via
comparison
to NRL and NIST (and indirectly other sources as well). The various ground
reference
time systems get measured and
What are the differences between HP5370A and 5370B version?
I have been told A's input ports are rather delicate and it has been better
protected on B version. I found notes on A and B and looked a them side by
side but honestly, they are difficult to compare. Anyone on list who had both
and
Hi
They both run hot and have “interesting” calibration procedures. Count on
spending some time running
through this and that to get the best performance out of them. The B does seem
to run a bit better, but
both meet the same basic specs.
The SR610 is a very similar device (with some similar
The "B" version uses custom hybrid modules for the inputs... and the CH1 and
CH2 hybrids are not the same... so you can't swap a CH1 hybrid with a CH2
hybrid.
I think the A and B model counters are fairly equivalent in their sensitivity
to input damage. It seems to be a lot harder to find
I got a nice system a while back (Modular System *808-400-14*) with both
rubidium and crystal oscillators.
I am getting some faults showing up, and need some insight into system
operation and how to fix it.
I got all the docs on the FEBO site which were very helpful, but they do
have have
Hi
It’s been more than a while since I last tore into one of those beasts.
My recollection is that the output modules have a set of buffer amps
on them. Each buffer has filtering appropriate to the designated output
frequency. One *could* convert a 5 MHz module to 10 MHz by swapping
out a bunch
Thanks to all who replied! It looks like the antioxidants will win and the
clock will fail before the 100 years are up. Assuming the "accuracy" of the
GPSDO is 1 part in 10^12 then the inaccuracy after 100 years will be up to
: 60x60x24x365.25x100x1x10^-12= 3ms [approximately] - which is probably
Hi
Depending on what you do or don’t consider GPS is somewhere in the 3 to 30 ns
range without corrections and better than that with corrections. Your GPSDO has
some
internal “stuff” that also gets into the act.
Indeed if you went to a dual band receiver and used any of the many free
On Fri, July 19, 2019 5:20 pm, donald collie wrote:
> Assuming the "accuracy" of the GPSDO is 1 part in 10^12
> then the inaccuracy after 100 years will be up to
That would assume that your oscillator maintained accuracy of 1 part in
1^12 without correction, and the GPS system stopped providing
21 matches
Mail list logo
