From jromney@aoc.nrao.edu Mon Feb 26 15:41:57 2007 Date: Mon, 26 Feb 2007 15:41:37 -0700 From: Jon Romney To: Tuomas Savolainen Cc: "VLBI Observers (Aspen only)" , Kaj Wiik Subject: Re: BS172 - schedule file Hi all, I've checked out this schedule -- .key, .sum, and crd. files -- and it looks OK to me. I also agree that the Caution message (which I had not seen before, either) arises from changing the bandwidth for the pointing scans. I asked Craig Walker about the exact import of the message from Sched, and he agreed that the behavior that it warns about is just what one wants to occur in this case. The caution was aimed at other cases. By the way, I don't believe changing BW=8 to BW=0 will suppress the mes- sage, nor will it change anything about the setup. As I understand it, you would have to set BW=8 (or BW=0) every time you use a new setup file, or create a new setup with BW=2 for the pointing scans *and* eliminate all the BW= specifications in the scan lines, in order to eliminate the caution message. There isn't any need to do this; the crd. files already do the right thing. Tuomas Savolainen wrote: > > Hi Lisa, > > I've been using an old version of SCHED (yes, I know, I should upgrade it) > and it does not show any message like that. I, too, suspect that its due > to switching to BW=2 for pointing scans and back to BW=8 for normal scans. > Command BW=8 is given only for the first scan after the pointing (to > return the bandwidth to the value normally used in target scans) and it is > used for all the observing frequencies (i.e. setup changes several times > after BW=8). This probably causes the warning message. However, there is > nothing wrong with this, since all the used observing setups have 8MHz > bandwidth. To get rid of that warning message, one could write BW=0 > instead of BW=8 in the first normal scan after every pointing scan. Do you > want me to do that or do we just go on with the current schedule? > > Cheers, > Tuomas > > > VLBI Observers (Aspen only) wrote: > > > > > Hi Tuomas, > > > > I've processed your key file for bs172a. Sched issued the following > > note: > > > > > CAUTION: You have set FREQ and/or BW for some scans but have not > > > changed them when switching to a new setup file. These parameters do > > > not change from scan to scan unless forced. It is possible that you > > > really did want them to change, perhaps to the value of the new setup > > > file. Check what you have done carefully. To cause SCHED to use the > > > setup file value, set FREQ=0 and/or BW=0. > > > > > > This is probably due to your 7mm pointing setup, but I'm not certain > > about that. Jon, do you have any comments? (The files are here: > > /home/vlbiobs/astronomy/dynamic/bs172a) > > > > I'll refrain from creating the station files for the remaining epochs > > until we know more about this caution note. > > > > Cheers, > > > > Lisa