Counter OCXO behaviour
Hammond has been known to make transformers.
My vote would have been for a balun (balanced to unbalanced transformer) as is often used in audio transmission lines, such as telephone lines.
Have you tried putting a meter on it?
-- FL
Fra: Jean-Louis Noel jln@stben.net
Til: Discussion of precise time and frequency measurement time-nuts@febo.com
Sendt: 2:24 tirsdag den 15. januar 2013
Emne: [time-nuts] hammond 77589
Hi all,
Will someone know what it could be?
http://www.stben.net/DSC_0338.JPG
http://www.stben.net/DSC_0339.JPG
Thanks for your help.
Bye,
Jean-Louis
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Hi
It's a solder sealed can with gray paint on it. The three pins on the bottom are numbered.
Assuming it's made by the same Hammond as the cases and transformers, it's a very obsolete part. With no date code on it, even knowing how old it is is not very easy. The lack of a date code also rules out most military applications.
Bob
On Jan 15, 2013, at 6:05 AM, Jean-Louis Noel jln@stben.net wrote:
It's a part of an oven regulator.
----- Original Message ----- From: "Jean-Louis Noel" jln@stben.net
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Tuesday, January 15, 2013 11:24 AM
Subject: [time-nuts] hammond 77589
Hi all,
Will someone know what it could be?
http://www.stben.net/DSC_0338.JPG
http://www.stben.net/DSC_0339.JPG
Thanks for your help.
Bye,
Jean-Louis
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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Somewhat of an understatement! <g> Hammond has been in the magnetics
business for many years and is a well known manufacturer of transformers and
inductors. Details of surrounding circuitry of the oven controller would
help.
DaveB, NZ
----- Original Message -----
From: "Flemming Larsen" oz6oi@yahoo.dk
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Wednesday, January 16, 2013 12:47 AM
Subject: Re: [time-nuts] hammond 77589
Hammond has been known to make transformers.
My vote would have been for a balun (balanced to unbalanced transformer) as
is often used in audio transmission lines, such as telephone lines.
Have you tried putting a meter on it?
-- FL
Fra: Jean-Louis Noel jln@stben.net
Til: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sendt: 2:24 tirsdag den 15. januar 2013
Emne: [time-nuts] hammond 77589
Hi all,
Will someone know what it could be?
http://www.stben.net/DSC_0338.JPG
http://www.stben.net/DSC_0339.JPG
Thanks for your help.
Bye,
Jean-Louis
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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Hi
The pinout would be rational for a spdt thermostatic switch. It's also reasonable for an autotransformer. Hammond makes (and has made) a lot of things.
Bob
On Jan 15, 2013, at 7:34 AM, Dave Brown tractorb@ihug.co.nz wrote:
Somewhat of an understatement! <g> Hammond has been in the magnetics business for many years and is a well known manufacturer of transformers and inductors. Details of surrounding circuitry of the oven controller would help.
DaveB, NZ
----- Original Message ----- From: "Flemming Larsen" oz6oi@yahoo.dk
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Wednesday, January 16, 2013 12:47 AM
Subject: Re: [time-nuts] hammond 77589
Hammond has been known to make transformers.
My vote would have been for a balun (balanced to unbalanced transformer) as is often used in audio transmission lines, such as telephone lines.
Have you tried putting a meter on it?
-- FL
Fra: Jean-Louis Noel jln@stben.net
Til: Discussion of precise time and frequency measurement time-nuts@febo.com
Sendt: 2:24 tirsdag den 15. januar 2013
Emne: [time-nuts] hammond 77589
Hi all,
Will someone know what it could be?
http://www.stben.net/DSC_0338.JPG
http://www.stben.net/DSC_0339.JPG
Thanks for your help.
Bye,
Jean-Louis
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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and follow the instructions there.
Il 2013-01-14 22:15 Charles P. Steinmetz ha scritto:
Because the oscillators are sealed assemblies, I'm not aware of
anyone who has taken one apart for analysis -- so the reason for this
behavior must be considered unknown until we know what is going on
inside.
By the way, there is a non working unit on ebay
in US just now, 58h to auction end.
If it was in EU I would have picked it up just
for dissection. Unfortunately for me shipping
charges are a little high for an autopsy:
ebay #251211816860
Best regards,
Charles
Fabio.
Yes the 1992 4E adjustment is a bear. Mine behaves pretty much the same, ISTR it took me a few days to get it adjusted to my satisfaction and it was still drifting a bit.
Interestingly I saw a 1992 with a built in Rb on eBay (I think in France) some years back but the price went way beyong my budget.
Dave
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Fabio Eboli
Sent: 14 January 2013 23:09
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Counter OCXO behaviour
I answer here to all, thank Ed David and Charles for your thoughts.
David, LOL, you posted the pic of the exact counter in question.
Not a similar unit, I mean it's exactly that 1992 that is being measured ;)
re ebay #251211816860 the seller is one I've dealt with a few times before, and
had excellent service. I would not hesitate to deal with them again.
FWIW according to the US Post Office web site a 1 pound package to Italy ships
for $11.60.
Bob L.
----- Original Message ----
From: Fabio Eboli FabioEb@quipo.it
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Tue, January 15, 2013 9:21:21 AM
Subject: Re: [time-nuts] Counter OCXO behaviour
By the way, there is a non working unit on ebay
in US just now, 58h to auction end.
If it was in EU I would have picked it up just
for dissection. Unfortunately for me shipping
charges are a little high for an autopsy:
ebay #251211816860
Fabio.
Robert,
I asked the seller for the least expensive way to
send that OCXO here (nothing to lose on a marginal
packaging, let's assume the item is non working)
and he quoted 12USD. I think I must refrain
from spending 20USD (assuming I will be the only
bidder) for a device to be dissected, althoug
I've done worse things with my ebay account :)
If it was a working OCXO I would have happily
bought it, but thinking about it I would not
dissect a working OCXO, for me it would be a crime :)
I will see if he has something interesting (and light)
in other items he listed, maybe I could share shipping
cost between items.
Il 2013-01-15 15:34 Robert LaJeunesse ha scritto:
re ebay #251211816860 the seller is one I've dealt with a few times
before, and
had excellent service. I would not hesitate to deal with them again.
FWIW according to the US Post Office web site a 1 pound package to
Italy ships
for $11.60.
Bob L.
Il 2013-01-15 15:31 David C. Partridge ha scritto:
Yes the 1992 4E adjustment is a bear. Mine behaves pretty much the
same, ISTR it took me a few days to get it adjusted to my
satisfaction
and it was still drifting a bit.
The strange thing is that mine now is changing frequency at
more than 1x10^-10 per day, measuring a 10MHz reference
this would be one digit per day, but before it was steady
on last digit for long time intervals, last digit moved up
and down only with day/night temperature variation.
Is it possible that the OCO was sealed by so much time,
opening it I changed the internal equilibrium? (humidity?).
Interestingly I saw a 1992 with a built in Rb on eBay (I think in
France) some years back but the price went way beyong my budget.
I've about this on this list, option 04R:
http://www.febo.com/pipermail/time-nuts/2011-November/060516.html
Fabio.
Fabio,
I'm glad to see that their shipping charge is fair. Turns out it is only about a
dollar more than the shipping to my place here in the states.
I did notice that the schematic for the oscillator's small PCB, the 5MHz to
10MHz doubler, is on KO4BB's site (page 22 of the PDF):
http://www.ko4bb.com/Manuals/Racal/Racal-Dana_1991-1992-ServiceManualSch.pdf
Makes me wonder if the oscillator is good, but the doubler has failed. If so,
the unit might be easily salvageable. As for what's in the sealed can, here's
hoping you end up with one, somehow, at a cost you are happy with.
Bob
----- Original Message ----
From: Fabio Eboli FabioEb@quipo.it
To: Robert LaJeunesse lajeunesse@mail.com; Discussion of precise time and
frequency measurement time-nuts@febo.com
Sent: Tue, January 15, 2013 10:04:37 AM
Subject: Re: [time-nuts] Counter OCXO behaviour
Robert,
I asked the seller for the least expensive way to
send that OCXO here (nothing to lose on a marginal
packaging, let's assume the item is non working)
and he quoted 12USD. I think I must refrain
from spending 20USD (assuming I will be the only
bidder) for a device to be dissected, althoug
I've done worse things with my ebay account :)
If it was a working OCXO I would have happily
bought it, but thinking about it I would not
dissect a working OCXO, for me it would be a crime :)
I will see if he has something interesting (and light)
in other items he listed, maybe I could share shipping
cost between items.
Il 2013-01-15 15:34 Robert LaJeunesse ha scritto:
re ebay #251211816860 the seller is one I've dealt with a few times before,
and
had excellent service. I would not hesitate to deal with them again.
FWIW according to the US Post Office web site a 1 pound package to Italy
ships
for $11.60.
Bob L.