[time-nuts] Owner's Manual and advice for Austron 2110 Disciplined Freque...
Leedyt at aol.com
Leedyt at aol.com
Sun Mar 27 02:43:04 UTC 2016
Bob:
Thanks for the advice. When the unit was powered on for about three days
(!) the "Not warmed up" message finally went away and it appears that the
unit will now lock onto an external 1 MHz signal to within a few parts in
10E-10. This was confirmed with direct measurement using a Agilent 53132A
driven with a GPS signal. At that point, things seemed to work properly and
the EFC voltage was 8.2xxx Vdc. So I suspect I have a few years of
EFC-voltage compliance left. I have not opened the plug to the mechanical trimmer
since I regard this as a last resort -- some variable capacitors have a
tendency to take a long time to settle into a new stable position after
adjustment.
So evidently, either I didn't wait long enough for the 2110 to properly
warm up and lock onto an external signal, or something (like a leaky
capacitor) "fixed itself" -- this would be more troubling. Since I don't have a
feel for the "time constants" of the instrument, I may switch it off and see
if it exhibits a long lock-on time the next time. But first I want to get
some ADEV data to see if the unit is better than what I am currently using.
I agree that the 2110 is an ancient instrument (~1968), but there are few
disciplined oscillators in this class that are in economic reach to those of
us that don't have deep pockets.
Thanks again for your thoughts.
-- Tom
In a message dated 3/26/2016 9:17:29 A.M. Eastern Daylight Time,
kb8tq at n1k.org writes:
Hi
The 1150 OCXO has an EFC pin on it. The output *should* tune to both sides
of 10 MHz.
Since this is an old box, the OCXO may have aged far enough to keep that
from happening.
If the EFC is railed, it is a good bet you need to tune the OCXO with the
mechanical trimmer
that is behind the seal screw on the OCXO. If that trimmer is already at
limit and you can’t get
to 10 MHz …. not a good thing.
Bob
> On Mar 25, 2016, at 10:48 PM, Tom Leedy via time-nuts
<time-nuts at febo.com> wrote:
>
> Hi --
>
> I am looking for a manual for an Austron Model 2110 Disciplined
Frequency
> Standard (P/N 23199611-45 S/N 8085IU). This unit reports that it is not
> warmed up even though the external temperature of the case of the
crystal
> oscillator reaches ~15 C temperature rise in a few hours as expected.
The
> internal oscillator is an Austron Model 1150 (S/N 4423 with frequency
outputs
> of 5 and 10 MHz, P/N 25299983). I believe that this request has been
> posted before, but a few years ago.
>
> Does the oscillator, by not correctly reporting as being warmed up,
> inhibit other functions? The frequency output, after a few hours, gets
within a
> few parts in 10E-8 on both 5 and 10 MHz. So I have faith the basic
> frequency generation capability is not trashed, but I can't get many
other
> function to work as expected.
>
> Any help would be greatly appreciated for either the 2110 or the 1150
> oscillator. Feel free to contact me off list.
>
> Tom Leedy
> Clarksburg, MD
> leedyt (at) aol (dot) com
>
>
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