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
budget.
Dave
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@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
Eboli fabi...@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
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
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
- Original Message
From: Fabio Eboli fabi...@quipo.it
To: Robert LaJeunesse lajeune...@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
Hello,
recently I tried to trim the Racal Dana
1992 04E internal reference, using the
GPS pps as a reference. I'd like to ask
a pair of questions...
- First is about the method.
I'm using the counter TI to measure it's
own OCXO. The GPS is starting the count,
the internal reference 10MHz (on the
Is it manually adjusted right at the oscillator? If so, just opening it
up and sticking a screwdriver in there gives it a thermal shock, and the
adjusted element will have mechanical stress that has to settle out too
- the value can change for a while.
Ed
The Racal Dana 1991/1992 OCXO has a big pair of pan head screws
exposed on the back. One is coarse adjust and one is fine adjust. I
have the TCXO version which also exposes the adjustment on the back so
you do not have to open anything to get to it.
You can see them here:
On Mon, 14 Jan 2013 21:14:23 +0100, Fabio Eboli fabi...@quipo.it
wrote:
Hello,
recently I tried to trim the Racal Dana
1992 04E internal reference, using the
GPS pps as a reference. I'd like to ask
a pair of questions...
- First is about the method.
I'm using the counter TI to measure it's
own
Ed wrote:
Is it manually adjusted right at the oscillator? If so, just opening
it up and sticking a screwdriver in there gives it a thermal shock,
and the adjusted element will have mechanical stress that has to
settle out too - the value can change for a while.
The 04E standard used in the
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 ;)
The pictures on eevblog show the early measurements I made with
the counter. One of
Il 2013-01-15 00:08 Fabio Eboli ha scritto:
Trying to be more clear:
10MHz period error (vs. GPS) changed from -0.8x10^-10 soon after
the trim, to +1x10^-10 after two days (top right).
Top right is change of phase in time, i.e. period error
measured using GPS as reference.
The OCXO period
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