Re: [time-nuts] 5062C (long shot) looking for ...

[Bill S]

I've got a couple of HP 5060-7202 extenders with 22 contacts. You're 
welcome to them if you think they might work.

Bill_S

On 4/21/2018 12:26 AM, Pete Lancashire wrote:

Does not hurt to ask, looking for ...

1259-1287 adapter

05062-60127 extender

05062-60128 extender

05062-60187 extender

05062-60126 2 x test cable



A8 10543-60013 5 MHz osc. assembly replacement 10543-00500
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Re: [time-nuts] Need a Watch Recommendation

[Bill S]

I wore a Casio "Atomic" watch and it set itself reliably for many years 
until very recently. They are still available.  I've replaced it with a 
Seiko Solar "Radio" watch which I understand has a better wwvb receiver 
in it. Haven't worn it yet so I'm not sure how it will perform but I've 
heard good comments.

Bill

On 3/5/2018 1:38 AM, Don Murray via time-nuts wrote:

Hello Time Nuts...


  
After 6 years of no troubles, in sync with WWV any

hour of the day, flawless transfer between
standard and daylight time my Stauer Titanium
Atomic wristwatch bite the dust a year ago.
  
Since then, Stauer has sent me three replacements,

each with some type of problem.
  
So it looks as if I am in need of a new wristwatch,

which will give me some kind of time accuracy.
  
So, Time Nuts...  any suggestions or recommendations?
  
TNX
  
73

Don
W4WJ
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Re: [time-nuts] CRT for Tracor 527A

[Bill S]

Dave,
I have a complete 527A with a slightly screwed up case (someone removed 
the handles and smoothed the edges!) that was working when I last used 
it about 6 years ago. The crt at the time was good and working. I had 
planned to put it on ebay but never got around to it. Email me off list 
if you're interested.

On 6/20/2017 5:01 PM, David C. Partridge wrote:

Trying a long shot here, I'm looking for a 1" CRT type 1EP1 (or 1EP11, or?)
for a Tracor 527A Frequency Difference Meter.
  
I did spot some on eBay but the vendor had a rather high opinion of their

worth :) at over 300 dollars

Anyone got one to spare?

Thanks
Dave

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Re: [time-nuts] Local Solar Time Clock

[Bill S]

Chris,
Mechanical clocks that display local solar time have been built for over 
a hundred fifty years. There are  mechanical wristwatches that also do 
the same thing and are currently available. They're extremely expensive 
but are being constructed.  The local solar time is usually presented on 
the dial as a hand which displays the difference in time in minutes (+ 
or -) from that shown on the dial. It's a simple matter to subtract or 
add the difference to the local time shown on the dial to get solar 
time. I designed a clock to do this some 25 years ago and although a bit 
painful to make, not really all that difficult. The clock that I 
designed at the time used a differential to actually display the solar 
time on the dial directly.  The solar time is determined in a clock or 
watch by means of a kidney shaped cam that is actually represents the 
anelemma and a follower on the cam moves a hand showing the difference 
in time from that shown on the local time dial. The difference in time 
is known as the equation of time. One such modern watch showing the 
equation of time can be seen here 
 
My personal interest has been constructing clocks showing sidereal time 
which is a bit complicated gearwise(if you want really good accuracy)n 
and one of mine can be seen here . I do 
remember seeing quite a few years ago an electric mains clock that had 
on the dial display an equation of time hand showing the difference 
between local time and solar time.


I guess the bottom line is that although not impossible, it is a bit 
difficult.


Bill_S


On 1/19/2014 7:25 AM, Tom Van Baak wrote:

I wonder if you really need a special clock?  Can't you adjust a normal
spring driven clock to run fast (or is it slow?) by about 1/3 of a percent
(one day per year)?  This should be within the range of adjustment.

Chris,

When you mention 1/3 percent, you're thinking sidereal time, which is a 
completely different concept, and much easier to implement than equation of 
time. Sidereal time is simply a calendar-day independent, fixed (2730 ppm) 
frequency offset. I already have PIC chips that do this; see PD28 under 
www.leapsecond.com/pic/picdiv.htm or read the comments in the source code at: 
http://www.leapsecond.com/pic/src/pd28.asm

Solar time, on the other hand, is continuously variable in rate (and phase) 
throughout the whole year. A microprocessor implementation of solar time also 
needs to know calendar date, time, and longitude. A 4800 baud GPS NMEA stream 
input would be a convenient way to obtain this information. Without using 
floating point or trig functions, a tiny PIC implementation would probably use 
a 365 entry lookup table to adjust the output tick rate on a per-day basis. A 
more capable Arduino or RPi might allow one to accurate calculate EOT directly 
from planetary motion equations, avoiding hard-coded tables altogether.

/tvb

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Re: [time-nuts] Austron 2200 Antenna service manual and Antenna required.

[Bill S]

Mark,
I have a NIB Austron 2021L Antenna with the accessories. I think it's an 
active antenna and might do the trick for you. If you're interested, 
contact me off list.

Bill


On 6/9/2013 5:45 AM, Mark C. Stephens wrote:

I have been looking through the manuals I received for my 2200.
In fact, Marked on the front of both binders is Operation and service for My 
serial number!
Serial number "11602Y"

One section contains the complete schematic, board layout, service notes, 
description and parts list for the Antenna assembly.
The antenna Part number is 12812282.

I have looked around and cannot find this on the web, would it be beneficial 
for the group if I get it scanned (contains A3 foldouts)?
And then upload to K04BB's manuals?

Also, I am desperately seeking an antenna for a 2200 series.


-marki
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Re: [time-nuts] WWVB Clocks don't sync anymore (revisited)

[Bill S]

Interestingly, I have three timepieces that will no longer synch to 
wwvb.Two Radio Shack digital clocks and a Casio wristwatch that I've 
worn for a couple of years and was always pretty much dead on. Like 
Paul, I have an analog Lacrosse clock that is running correctly. Nothing 
I've tried will make the other clocks synch.


Bill_S
W2FMA

On 3/19/2013 5:29 PM, paul swed wrote:

Funny you bring this up. I am just noticing a sharp clock that I always use
and it has been accurate. But it did not flip with the time change this
time and though it says its locked its off by 45 seconds slow. Yet a
lacross clock across the room seems to be on second wise but never flipped
with the time change.
As I say its just becoming apparent.
Regards
Paul
WB8TSL

On Tue, Mar 19, 2013 at 4:55 PM, Clint Turner  wrote:


A few weeks ago I posted a question/comment about some of my WWVB-based
"Atomic" clocks no longer setting themselves properly. These two clocks,
SkyScan #86716, would show the symbol indicating that they had set
themselves, but their time was drifting away from UTC.  Interestingly, they
*would* set themselves exactly once upon installation of the battery, but
never again.

Since that time, I've done a bit of digging around.

The first suspicion was that, perhaps, the NIST had fudged a bit in the
WWVB timecode recently, so I manually decoded a few frames and analyzed
them:  Nothing suspicious there.

The next question was if the addition of the BPSK somehow skewed the
timing of the TRF's AGC/threshold - but logically, this didn't make sense
since the clock *did* set itself exactly ONCE - and it wouldn't have been
able to do this at all were this the case.  Out of curiosity I poked around
on the board and found the trace containing the time code and found that
despite the BPSK, its timing was exactly as it should have been:  No
surprise there.

This left the clock itself, so I did what any other Time Nut would do:  I
built a WWVB simulator.

Initially, I set it to a 2010 date - a time that I knew that the clock
worked properly.  I had two clocks:  One that I'd just reset by pulling and
replacing the battery while the other had been "stuck" for a few weeks, not
resetting itself nightly as it should. I put both of these in the coupling
loops from my WWVB simulator and over the next few days, the recently
re-set clock happily synchronized itself while the other one with the 2013
date was still "stuck."  I then reset that clock and it, too, behaved
itself from then on.

I then reset the clock on the simulator to a February 2013 date and time.
  Initially, both clocks reset themselves to the current time and date at
their next midnight, but after that, they got "stuck", never resetting
themselves at "night" again.

So, it appears to be a problem with "Broken Sand" (e.g. a silicon problem).

For the morbidly curious, I have documented my efforts here:

http://ka7oei.blogspot.com/**2013/02/did-nist-break-bunch-**of-radio.html-
 The initial testing

http://ka7oei.blogspot.com/**2013/03/yes-nist-did-break-**
bunch-of-radio.html-
 The testing with the WWVB simulator

73,

Clint
KA7OEI

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Re: [time-nuts] Tissot wrist watch

[Bill S]

On 4/6/2011 10:33 AM, Greg Broburg wrote:

For mechanical watch movements such as Rolex
and Patek quality used a microphone to resolve
the sounds of the escapement reference. They
had a strip chart recorder on the top and displayed
the recovered acoustical signature onto a plot of
against the internal crystal reference which ran a
stepper motor moving the paper. I believe that the
manufacturer was Heuer. Last look was 20 yrs ago.

Same idea for 32k768 bender time references
different type of acoustical pickup then lots of
gain and a BP filter at 32k8.

No experience with newer 4M194 style watches.
Maybe build an RF induction pickup with a 4M2
filter and amplifier to try to find it then more
cleanup to get it to a counter

Greg



On 4/6/2011 5:32 AM, asma...@fc.up.pt wrote:


Dear Time-Nuts,

I am afraid of being off topic with the following.
If so, I sincerely apologize.
An excellent reference timer is the MicroSet made by Bryan Mumford. 
It will do exactly what you want and even has an available GPS 
reference if you need the accuracy. I've used one for quite a few 
years and have no connection with Mumford except as a customer.

Bill S






I would like to know the precision to be expected
on time keeping from a Tissot mod. J378/478 S wrist
watch and how could be verified the fulfilment of
that specification without waiting for a long time
(probably more than one month) to observe an error
of one second.

Instructions on how to build a test basket or similar
layout would be most appreciated.

Thanks in advance,
Antonio
CT1TE


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[time-nuts] Tracor 304D Rubidium Standard

[Bill S]

As my age is catching up to me and as part of the process of making life 
a bit simpler, I've decided to dispose of a number of the precision time 
items that I've acquired over the years. I've put a few things on ebay 
that might be of interest, but the 304D is really quite nice and is 
fitted with a Patek mechanical clock.
If it's not ok to mention these things on the list just let me know and 
I won't do it again...

Bill S

www.precisionclocks.com

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Re: [time-nuts] Tool Needed to Access my Timer Battery

[Bill S]

As an aside to the watch repair business, a large number of brands 
primarily Swiss, will no longer supply parts to watchmakers. This has 
become a big issue among the independent watch repairers in the US. It 
really is an issue of restraint of trade but is currently unresolved.  
Though not exclusively, the makers refusing to supply parts are the 
higher end makers. In order to get your Patek Phillipe repaired for 
example, you must bring it to an authorized Patek dealer who then 
(usually) will send it to a central repair location. The cost of repair 
is substantially higher under those circumstances. A list of makers 
refusing to supply parts to independent repairers can be found here:


http://www.ccwatchmaker.com/restrictedbrands.html

Bill S

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Re: [time-nuts] And you thought you were old

[Bill S]

Got my license in 1952 and the propagation was unbelievable on 10 and 20 
meters into the 60's.

Bill S
W2FMA


Raj wrote:

'59 was one of the biggest peaks of propagation if I remember being told by my 
OT Elmer Les vu2ak.
10W AM to the US from VU.

  

early 60's. Could hear the whole world on it with a piece of wire.
Conditions on 10 were great then. 73 - Mike

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960



  



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Re: [time-nuts] Sidereal time

[Bill S]

Brian,
Last I looked, the solar/sidereal ratio was in fact 1:1.00273790935 
though that was a  while back. I build "precision" pendulum clocks and 
in designing a clock that would beat seconds and tell mean time as well 
as sidereal time I used a gear train of  15/47x49/97x82/31/x87/37 as I 
remember, which gave me an error of approximately .0073 secs/year 
sidereal. I know it's a bit arcane for this group, but the accuracy 
isn't bad! Doing the equation of time is mechanically a bigger pia...

Bill S

Brian Kirby wrote:
I would like to have an electronic clock to keep sidereal time.  I am 
planning on using a HP 59309A, which can except an external clock of 
1/5/10 Mhz.


According to Wikipedia sidereal time is 23 hours 56 minutes and 4.091 
seconds - a total of 86,164.091 seconds


So 86,400 seconds for a normal "atomic defined" day divided by 
86,164.091 = 1.002,737,903,89


If I set the 59309A to 10 Mhz external clock and dial a synthesizer up 
to 10.0273790, the unit should be able to keep sidereal time.


Is my math and theory correct ?

Brian - KD4FM

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Re: [time-nuts] Non electrical time-nuttery

[Bill S]

There is actually an "optically pumped" pendulum clock that was designed 
by Betrisy called the Chronolith. Conceptually really interesting. You 
can see it on his website: 
http://www.betrisey.ch/echronolit.htm


Bill S


J. Forster wrote:

Maybe you could "pump" the pendulum optically, using a beam of light, like
those glass bulb "radiometers" they sell that spin on a sunny window
ledge.

-John

=



  



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