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Re: ToO for Wednesday (VX017A)

From: <c.reynolds_at_email.protected>
Date: Wed, 29 May 2013 09:35:48 +0800

Just to confirm, we won't be looking for a pulsed signal at L-band -
the temporal smearing will be too great to get any benefit from that.

cheers,
Cormac.

On 29 May 2013 07:57, John Reynolds <John.Reynolds_at_csiro.<!--nospam-->au> wrote:
>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.**VX017A<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
>>>>------------------------------**----------------------
>>>>
>>>>
>>
>>
>
>>>
>>
>
-- 
----------------------------------------------------
Cormac Reynolds
Phone: +61 8 9266 3785
Fax: +61 8 9266 9110
email: c.reynolds_at_curtin.<!--nospam-->edu.au
----------------------------------------------------
Received on 2013-05-29 11:36:15