From: <shoriuchi_at_email.protected>
Date: Wed, 29 May 2013 15:09:59 +1000

Hi John and Cormac,

Shall I leave with a noise diode turned on throughout the experiment,
perhaps for 0.25K noise diode with a 20 Hz modulation?

Cheers,
Shinji.

-----Original Message-----
From: John Reynolds [mailto:John.Reynolds_at_csiro.<!--nospam-->au]
Sent: Wednesday, 29 May 2013 9:57 AM
To: shinji horiuchi
Cc: James Lovell; Cormac Reynolds; LBA list observers; Jean-Pierre
Macquart; Horiuchi, Shinji
Subject: Re: ToO for Wednesday (VX017A)

Shinji,

>By the way, do we turn off the automatic gain control on DAS for this
>experiment?

I would say leave AGC and thresholds running as normal. Otherwise it
will become even more difficult to manage the difference in levels
between the target and the cals.

In any case the ToO proposal appears to discount the possibility of a
pulsed signal being detectable at this frequency so I assume there'd be
no interest in disabling these loops.

Cheer,s
John R

On Wed, 29 May 2013, shinji horiuchi wrote:

>By the way, do we turn off the automatic gain control on DAS for this
>experiment?
>
>Cheers,
>Shinji.
>
>
>On 28 May 2013 16:40, shinji horiuchi <shoriuch_at_gmail.<!--nospam-->com> wrote:
>
>>Cormac,
>>
>>I guess SgrA* at L-band is still weaker than ambient load. DAS for
>>64MHz profile for L-Band looks fine with the level between sky and
ambient load.
>>
>>As I told you in the separate email, 70m is only available for
>>limited time, i.e. 10:00-13:00 and 17:45-19:30, we should take some
lisk for Tid.
>>The antenna is yet to return to be operational and I won't be onsite
>>to run this, leaving Phil Pope in ops team to run this.
>>
>>Cheers,
>>Shinji.
>>
>>
>>On 28 May 2013 15:50, John Reynolds <John.Reynolds_at_csiro.<!--nospam-->au> wrote:
>>
>>>Shinji,
>>>
>>>
>>>I would just play with manual attenuators to get the signal within
>>>the
>>>>right range.
>>>>
>>>
>>>That could be twice every 6 minutes, as we switch between the pulsar

>>>and the cal. Be nice to have some help if you're doing this.
>>>
>>>On the other hand the DAS might just be able to cope with the range,

>>>though SgrA* is the strongest source in the sky other than the Sun
>>>so I'm guessing maybe not.
>>>
>>>Cheers,
>>>John R
>>>
>>>
>>>On Tue, 28 May 2013, shinji horiuchi wrote:
>>>
>>>I would just play with manual attenuators to get the signal within
>>>the
>>>>right range.
>>>>
>>>>Cheers,
>>>>Shinji.
>>>>
>>>>
>>>>On 28 May 2013 14:27, James Lovell <Jim.Lovell_at_utas.<!--nospam-->edu.au> wrote:
>>>>
>>>>Some programmable attenuators would be nice at Tid. There were
>>>>some
>ready
>to install when I was there. Leigh Cameron even got them working
>but they caused RFI (or something) so had to be removed.
>
>Maybe if Shinji could plumb the signal though the MkIV rack as
>this has programmable attenuators that can be controlled from the
Field System.
>
>Or perhaps better to record to Mark5 and have a couple of extra
>procedures that are called after source changes to adjust the
>attenuation? Then no re-wiring is needed.
>
>Cheers,
>Jim
>
>
>
>
>On 28/05/2013, at 2:14 PM, John Reynolds <John.Reynolds_at_csiro.<!--nospam-->au>
>wrote:
>
>Cormac,
>>
>>some Tid time has just become available for vx017a, so I have
>>updated
>>>
>>
>>Should be fun maintaining acceptable levels when switching on and

>>off
>>
>SgrA, something that promises to be interesting at Parkes as well.
>
>>
>>Cheers,
>>John R
>>
>>On Tue, 28 May 2013, Cormac Reynolds wrote:
>>
>>hi,
>>>
>>>some Tid time has just become available for vx017a, so I have
>>>updated the schedule (and redistributed). Please make sure you
>>>are using the vex file with 'PI revision number: 2.0'. Some of
>>>the scan timings have changed to incorporate the slower moving
antenna.
>>>
>>>thanks,
>>>Cormac.
>>>
>>>On 27 May 2013 18:40, Cormac Reynolds <c.reynolds_at_curtin.<!--nospam-->edu.au>
>>>wrote:
>>>
>>>>hi all,
>>>>
>>>>I have created a schedule for Wednesday's LBA ToO. Schedules
>>>>have been distributed to the telescopes and the wiki pages are
>>>>in place:
>>>>http://www.atnf.csiro.au/vlbi/**wiki/index.php?n=LBAMay2013.**V
>>>>X017A<http://www.atnf.csiro.au/vlbi/wiki/index.php?n=LBAMay2013
>>>>.VX017A>
>>>>
>>>>Regards,
>>>>Cormac
>>>>
>>>>--
>>>>------------------------------**----------------------
>>>>Cormac Reynolds
>>>>Phone: +61 8 9266 3785
>>>>Fax: +61 8 9266 9110
>>>>email: c.reynolds_at_curtin.<!--nospam-->edu.au
>>>>------------------------------**----------------------
>>>>
>>>
>>>
>>>
>>>--
>>>------------------------------**----------------------
>>>Cormac Reynolds
>>>Phone: +61 8 9266 3785
>>>Fax: +61 8 9266 9110
>>>email: c.reynolds_at_curtin.<!--nospam-->edu.au
>>>------------------------------**----------------------
>>>
>>>
>
>
>>>>
>>
>
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Received on 2013-05-29 15:10:05