L-band experiments
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From: <Simon.Ellingsen_at_email.protected>
Date: Wed, 05 May 2010 09:25:07 +1000
Hi Brett & VLBI observers
We have a couple of L-band experiments during the LBA session, one starts Friday 10 AM AEST, and the other two are at the end of the session (starting 12 PM on Sunday).
The vt14a (Friday 10 AM - 5 PM) and vt14b (Sunday 8 PM - Monday 8 AM) are 64 MHz experiments and will need the BG3 cable installed at the start and removed at the end. The other L-band experiment (v308a) is standard dual polarization 2x16 MHz and needs the normal cable.
The schedule for v308a says that it has a centre frequency of 1400 MHz. This is what we used for the observations last week and I expect the same centre frequency to be used for the vt14 experiments, but have emailed Tasso and Chris to get confirmation of this.
I think that its probably a good idea to setup the polarization today before switching to 22 GHz for the start of the experiments, then it should be quicker to get going during the run, since it should simply be a matter of putting the hybrid in (I think that we should just leave the attenuation set at the levels to balance 1400 MHz). I would expect the parameters recorded on the wiki at
http://www-ra.phys.utas.edu.au/wiki/index.php?n=MtPleasant26m.Lbandcircular
should still apply (and could well still be set).
If the polarization setup we found last week still applies then we should also be able to use the CAL scaling factors which Jay used in vt4g for the L-band experiments this week.
Regards
Simon
Date: Wed, 05 May 2010 09:25:07 +1000
Hi Brett & VLBI observers
We have a couple of L-band experiments during the LBA session, one starts Friday 10 AM AEST, and the other two are at the end of the session (starting 12 PM on Sunday).
The vt14a (Friday 10 AM - 5 PM) and vt14b (Sunday 8 PM - Monday 8 AM) are 64 MHz experiments and will need the BG3 cable installed at the start and removed at the end. The other L-band experiment (v308a) is standard dual polarization 2x16 MHz and needs the normal cable.
The schedule for v308a says that it has a centre frequency of 1400 MHz. This is what we used for the observations last week and I expect the same centre frequency to be used for the vt14 experiments, but have emailed Tasso and Chris to get confirmation of this.
I think that its probably a good idea to setup the polarization today before switching to 22 GHz for the start of the experiments, then it should be quicker to get going during the run, since it should simply be a matter of putting the hybrid in (I think that we should just leave the attenuation set at the levels to balance 1400 MHz). I would expect the parameters recorded on the wiki at
http://www-ra.phys.utas.edu.au/wiki/index.php?n=MtPleasant26m.Lbandcircular
should still apply (and could well still be set).
If the polarization setup we found last week still applies then we should also be able to use the CAL scaling factors which Jay used in vt4g for the L-band experiments this week.
Regards
Simon
-- Simon Ellingsen : Senior Lecturer Physics & Astronomy, University of Tasmania email : Simon.Ellingsen_at_utas.<!--nospam-->edu.au WWW : http://fcms.its.utas.edu.au/scieng/physics/pagedetails.asp?lpersonId=681 Phone : 6226 7588 ; Area Code : +61 3 (International) 6278 8636 (Home), 6226 2410 (Fax) 03 (Australia)Received on 2010-05-05 09:26:28