[daip] Re: bandpass problems

[Jim Ulvestad]

The BBCs used at many of the European stations have
quite different shapes compared to the VLBA BBCs.
(Or, the VLBA BBCs have quite different shapes 
compared to the ones in Europe ...)  My recollection
is that the VLBA BBCs tend to have a gentle slope
through most of the bandpass, then scream down at
the high end.  The European BBCs tend to have their
amplitude response more centrally peaked, I think
with a more symmetric looking bandpass.  I don't
recall the phase response.

So I wonder if the same setting for the parameter
even is the right thing for all the telescopes?

Jim

On Tue, 3 Jun 2003, Phil Diamond wrote:

> 
> I'll investigate. I have a date with a dentist in 40 mins so will try from
> home tonight.
> 
> Thanks, Phil
> 
> On Tue, 3 Jun 2003, Eric Greisen wrote:
> 
> > Hah - the cause of the difference is in BPASSP(5) which you set to 1
> > (no channel 0 divide record by record) and I set to 0.  I wonder if
> > some of the European telescopes are wandering in phase or amp by a lot
> > esp at the right hand side???
> >
> > Eric
> >
> 
> --------------------------------------------------------------------------
> Professor Philip Diamond                  | pdiamond at jb.man.ac.uk
> Director, MERLIN & VLBI National Facility |
> University of Manchester                  |
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