Re: [time-nuts] WWV or Net Clock controlled oscillator

[Thomas Miller]

 Take a look at the Maxim
DS32KHZS 32.768kHz Temperature-Compensated Crystal Oscillator TCXO
 Available in 14 pin dip, needs +5 (you have), batt (you have, ground. Supplies 
32,768 that you feed into pin 17 of the clock chip after removing the existing 
Xtal. Supposed to hold 1 min per year over the full temp range with no 
adjustment. 

This guy says he has them in the 14 pin dip:


Regards



 

-Original Message-
From: D. Resor 
To: 'Tom Van Baak' ; 'Discussion of precise time and 
frequency measurement' 
Sent: Mon, Mar 5, 2018 10:02 am
Subject: Re: [time-nuts] WWV or Net Clock controlled oscillator

The unit has an external switching power supply which provides 5+ VDC.  In 
addition there is a 24VAC transformer which provides the power for the bell 
solenoids.  This where the AC reference is "sampled"  I cannot completely cut 
out the AC transformer as it is essential to other operations of the DCBI.

A lot to study.




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Re: [time-nuts] WWV or Net Clock controlled oscillator

[Thomas Miller]

Ok, looking at the pictures and the datasheet gives several questions.

1)  What signal is on TP1? Is it 32,768 Hz?
2)  What does C3 do? Is it used to trim the 32,768 Xtal?

3)  Out of curiosity what is the frequency of U2, the oscillator module?

Maybe you can remove the 32,768 Xtal and feed in a more accurate reference 
(from a 32,768 TCXO or OCXO). Or a derived from a 10 MHz GPSDO divided to 
32,768 and fed into pin 17 of the 5832?

I wonder if the 60 Hz line option just feeds an input to the Z80 processor and 
the time keeping is done in software? Again, what does C3 do?

I know there are some Rb oscillators that can be programmed to output 32,768 
Hz. Might try looking for one of those.


 Interesting problem. Thanks for sharing it.

Regards,

 

-Original Message-
From: D. Resor 
To: 'Discussion of precise time and frequency measurement' 
Sent: Mon, Mar 5, 2018 10:02 am
Subject: Re: [time-nuts] WWV or Net Clock controlled oscillator

I have been soldering since I was in high-school (circa 1970s) and before that.

I have two additional Maas-Rowe Controllers here at home I can work with. 
However I do not want destroy them to the point of no return as finding used 
units relatively good condition is becoming more difficult.  Some of the 
integrated circuits are a bit difficult to come by also.


Donald R. Resor Jr. T. W. & T. C. Svc. Co.
http://hammondorganservice.com
Hammond USA warranty service
"Most people don’t have a sense of humor. They think they do, but they don’t." 
--Jonathan Winters



-Original Message-
From: time-nuts  On Behalf Of paul swed
Sent: Sunday, March 04, 2018 2:21 PM
To: Discussion of precise time and frequency measurement 
Subject: Re: [time-nuts] WWV or Net Clock controlled oscillator

Donald
I don't know if anyone makes such a thing. But I can easily think of numbers of 
answers.
It depends on what the Mass Rowe will allow and how comfortable you are with a 
soldering iron.
I will guess you need to dig in and supply a better reference. I searched the 
web for mass rowe and it seems operating manuals are available but no 
schematics.
If you can figure out how to inject a new reference things get interesting.
It may be as simple as a tap off of the power transformer going to a squaring 
circuit.
Easy thoughts. Oven oscillator like 6 Mhz divided down.
Pictics a time nut makes them. Don't remember if there was a Mhz in and 60 Hz 
out.
Then you can go even more interesting with GPDSOs that are divided down to get 
the 60 Hz.
Good luck
Regards
Paul
WB8TSL


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Re: [time-nuts] WWV or Net Clock controlled oscillator

[Thomas Miller]

Can you supply any schematics, good images of the electronics? We may be able 
to suss out how they do the internal reference. 

I am thinking that since it has a 2.4 volt NiCd battery backup that it used 
some sort of 32,768 quartz oscillator for time keeping. It may also have some 
adjustment you can do to improve the accuracy.

There are xtal controlled 60 Hz inverters that might provide a better frequency 
reference. Even some UPS systems that run all the time could be explored.


 Good luck. 

 

 

-Original Message-
From: D. Resor 
To: Time Nuts List 
Sent: Sun, Mar 4, 2018 2:45 pm
Subject: [time-nuts] WWV or Net Clock controlled oscillator

Hello,

 

My first post here. I found this group's user group page while researching a
source for either a WWV, GPS or Network referenced oscillator.

 

The devices/equipment which I was able to find didn't  seem to fit the
requirements.

 

What I have is a Maas-Rowe DCB1 (Digital Chronobell Series 1) clock
controller.  

Seen here:
http://hammondorganservice.com/downloads/images/carillon/TempleCitySDADCB1a.
jpg

 

The system can be heard playing the Westminster Chimes and striking 12 noon
here:

 

https://www.youtube.com/watch?v=Ij5c6RqGhn0

 

 

It can be programmed to play Westminster sequences and/or music selections
using Maas-Rowe real struck chromatically tuned bell rods.

 

This unit is installed in Southern California Edison area.  The problem is,
this unit receives its clock reference from the 60Hz AC line to keep it in
sync.  Up until a few years ago this worked very well.  Now, Edison's 60Hz
line frequency is all over the place and this clock unit now gains 30
seconds and/or more a week which makes it difficult to keep it synchronized.

 

The 60Hz reference can be switched out by the use of dip switches, however
that setting isn't much better.

 

I was trying to locate a cost effective clock reference which can be
synchronized from either WWV, request the correct time from a net server or
possibly GPS.  It then needs a clock referenced output of 60Hz.

 

Does such a thing exist?

 

Thank You

 

 

Donald R. Resor Jr. T. W. & T. C. Svc. Co.

http://hammondorganservice.com
Hammond USA warranty service
"Most people don't have a sense of humor. They think they do, but they
don't." --Jonathan Winters

 

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