<div id="_htmlarea_default_style_" style="font:10pt arial,helvetica,sans-serif"><div>Dear Eric and Amy,</div><div><br></div><div>attached I send you
some slides regarind my problem with BPASS as discussed in the slack channel of SIW:</div><div><br></div><div>"Working with my own data (VLBA
continuum) I had one IF of one antenna
(let's say it is antenna A) wander off in the Tsys plots. By looking at
the POSSM plots I could determine that some channels had a higher
amplitude than average, thus I flagged them for this station because I
assume it is RFI (they were only few channels, but varying with time,
thus I ended up flagging a block of ~8% of channels in the inner part of
the frequency range). Later after the BPASS task I got problems for
these channels at all baselines except those involving station A. The
respective channels showed an offset in the POSSM baseline plots after
BP table got applied compared to the other channels of that baseline.
However, plotting the BP table did not show such an offset for
respective channels for any of the stations. I tried several setups of
BPASS but could not solve the problem. So at the end, I just flagged the
whole IF for that station although I felt bad throwing away so much
otherwise reaonably looking data. For the future: What to do if I detect
such pattern that looks like RFI? Does it need to get flagged, and if
so, how? Or will the weighting inside AIPS take care of it and for
example give such data such a low weight that it will not be considered
anymore?"</div><div><br></div><div><br></div><div>Maybe you find my error? <br></div><div><br>Best regards</div><div>Susanne<br></div><div><br></div>--
<br>M. Sc. Susanne Lunz<br><br>Dept. 1: Geodesy<br>Sect. 1: Space Geodetic Techniques<br>Tel.: +49 (0)331/288-1142<br>Email:
susanne.lunz@gfz-potsdam.de<br>___________________________________<br> <br>Helmholtz Centre Potsdam<br>GFZ German Research Centre for
Geosciences<br>Stiftung des öff. Rechts Land Brandenburg<br>Telegrafenberg, 14473 Potsdam<br></div>