[time-nuts] WWV or Net Clock controlled oscillator

Mon Mar 5 08:55:35 EST 2018

I am sure there are master circuit diagrams of the DCB1 but I've never seen them during my visits to the factory.  It was explained to me, there are no printed service manuals for the digital product line.

If I have questions the engineer or the owner can answer them.  Which I may also need to do.   I do know there was work done for an accessory attachable to the DCBIII with the addition of a WWVB receiver or GPS, (which is an expanded version of the DCBI) I cannot remember of the two technologies it was.

I do know that the clock is a OKI m5832, and I have looked at the datasheet which explains how the ±30 second pin on the IC is "adjust" on Pin 15, however I do not know how the 60Hz is used to trigger it.  

I have uploaded images of the PC boards both component and solder side here in a win zipped file folder here:

http://hammondorganservice.com/downloads/images/carillon/MRdcb1boards.zip

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 <time-nuts-bounces at febo.com> On Behalf Of Thomas Miller
Sent: Sunday, March 04, 2018 2:50 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] WWV or Net Clock controlled oscillator

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 <organlists at pacbell.net>
To: Time Nuts List <time-nuts at febo.com>
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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