From: <Chris.Phillips_at_email.protected>
Date: Thu, 3 Mar 2016 08:25:28 +0000

Hi all

JimP just replied (but does not have permission to post…):

"The AGC will definitely need to be disabled. A pulsar observation happened =
when I was on point for an LBA run a few years back, and chaos was rampant=
as we all urgently tried to figure out what to do to the DAS. I never hear=
d how it worked out.

I'd suggest this be planned ASAP.

For my own Vela observations I created my own "AGC" scripts that run every =
5 minutes and adjust the attenuation based on the output of vsib_record. Ev=
en though this is only a 3 hour recording, levels will move by up to 1dB in=
that time.

Jim Palfreyman”

My reply is:


I actual don’t think it is that simple - it depends on the science. I will contact Franz and see what he wants.

If this is just imaging (astrometry) these is no need to disable AGC. If he wants to do timing, then obviously we need to.

Cheers
Chris




> On 3 Mar 2016, at 6:14 PM, Jamie.Stevens_at_email.protectedo.au wrote:
>
> Hi Cormac,
>
> For the Vela observations, are we to disable AGC in the DAS?
>
> cheers
> Jamie
>
> ________________________________________
> From: owner-vlbiobs_at_atnf.csiro.au [owner-vlbiobs_at_atnf.csiro.au] on behalf of Cormac Reynolds [cormac.reynolds_at_csiro.au]
> Sent: Thursday, 3 March 2016 17:14
> To: vlbiobs_at_atnf.csiro.au
> Subject: Schedules for Mar 4 - 6
>
> hi,
>
> the first schedules for this week's observations have been distributed
> and are available on the (new) wiki:
> http://www.atnf.csiro.au/vlbi/dokuwiki/doku.php/lbaops/lbamar2016/start
>
> v537a will set up a little differently than usual. The fringe finder
> part of the schedule starts at 06:00 UT and runs until 07:30. At 07:30
> it will slew to Vela and begin the science observing a little earlier
> than originally planned. Tid will join shortly after 07:30 and the
> fringe test for Tid will be done on Vela. The source should be plenty
> bright for the 70m.
>
> vx024a: the fringe finder does not rise at Hh until 11:06 UT (the
> schedule starts at 10h30m).
>
> cheers,
> Cormac.

Received on 2016-03-03 19:25:30