[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 <organlists at pacbell.net>
To: 'Discussion of precise time and frequency measurement' <time-nuts at febo.com>
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 <time-nuts-bounces at febo.com> On Behalf Of paul swed
Sent: Sunday, March 04, 2018 2:21 PM
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
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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