Re: Hobart out of action
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From: <richard.dodson_at_email.protected>
Date: Wed, 25 Feb 2009 13:53:51 +0900
Hi Simon
It is a shame about Hobart not observing, as I believe it is
important for the polarisation calibration (very different feed angle
at all times, and a different rotation). Nevertheless thanks for the
efforts to fix it.
Richard
On Wed, Feb 25, 2009 at 1:30 PM, Simon Ellingsen
<Simon.Ellingsen_at_utas.<!--nospam-->edu.au> wrote:
>Hi,
> This morning we had a problem with the Hobart 26m where for
>reasons unknown the antenna ended up in the northern dead limits. This
>occurred just after the antenna appeared to park due to a windstow.
>
>We are investigating how it is that an antenna which should have been at the
>zenith with the drives off could end up in the limits when all the logged
>information we have indicates that the drives were off and the brakes on.
>I'm sure you all appreciate that we can't commence observations with Hobart
>again until we've determined the cause of the problem and are sure that it
>is fixed.
>
>Brett and Eric have been working on this all day and have identified a
>faulty relay in the drive-off circuit as the potential culprit, they are
>currently testing the system. We hope to have the problem sorted by the end
>of the working day tomorrow and will keep everyone informed - however, we
>wont be unable to observe tonight (Feb 25th)
>
>Apologies to those PIs who have been adversely affected by this, however,
>I'm sure you understand that we have to place safe operation of the antenna
>ahead of anyone's observations.
Received on 2009-02-25 15:54:14
Date: Wed, 25 Feb 2009 13:53:51 +0900
Hi Simon
It is a shame about Hobart not observing, as I believe it is
important for the polarisation calibration (very different feed angle
at all times, and a different rotation). Nevertheless thanks for the
efforts to fix it.
Richard
On Wed, Feb 25, 2009 at 1:30 PM, Simon Ellingsen
<Simon.Ellingsen_at_utas.<!--nospam-->edu.au> wrote:
>Hi,
> This morning we had a problem with the Hobart 26m where for
>reasons unknown the antenna ended up in the northern dead limits. This
>occurred just after the antenna appeared to park due to a windstow.
>
>We are investigating how it is that an antenna which should have been at the
>zenith with the drives off could end up in the limits when all the logged
>information we have indicates that the drives were off and the brakes on.
>I'm sure you all appreciate that we can't commence observations with Hobart
>again until we've determined the cause of the problem and are sure that it
>is fixed.
>
>Brett and Eric have been working on this all day and have identified a
>faulty relay in the drive-off circuit as the potential culprit, they are
>currently testing the system. We hope to have the problem sorted by the end
>of the working day tomorrow and will keep everyone informed - however, we
>wont be unable to observe tonight (Feb 25th)
>
>Apologies to those PIs who have been adversely affected by this, however,
>I'm sure you understand that we have to place safe operation of the antenna
>ahead of anyone's observations.
Received on 2009-02-25 15:54:14