Introduction

It is possible that NRAO has already been able to retrieve your resources from what you specified in your proposal. If this is the case you will find these in a resource catalog labeled with an editable legacy ID name in the column at the left. However, you should follow the examples below to get a feel for what is in your resource catalog. You will want to check the entries in your resource catalog, especially if you require specific frequency settings, and the examples will help you check and/or modify the content.

When you are planning simple continuum observations at default EVLA frequencies only, and thus all anticipated resources are already defined in the NRAO defaults catalog, it is strongly suggested that you make separate personal catalogs for your different PBs/SBs. Simply copy the resource of interest from the NRAO defaults catalog to your Personal catalog. Not only will the reason become clear later on, it also creates an opportunity to get used to the tool and you will find that scheduling using small catalogs will be faster over the web interface. If you plan a spectral line observation, it is instructive to read the continuum case first as this saves repeating information. Resources for continuum OSRO1 and OSRO2 spectral line observations may be mixed in the same resource catalog and resource group.

After creating a (re)source catalog, the new information needs to be saved in the data base. Upon FILE - EXIT, if there are any unsaved changes, a dialog box will appear with the question whether to save the changes or not. Navigating between the tools will implicitly save changes in the tool you are moving away from. To be absolutely sure your changes are saved, use FILE - SAVE ALL before exiting or navigating to another tool (or at any other convenient occasion). If in the meantime your session has expired, you will find an Autosave: .. catalog (with the same name of the catalog that had unsaved data) that contains the unsaved changes at the moment your session expired; you have the option to continue with that catalog and delete the old catalog, or start with the old catalog and simply delete the Autosave: .. catalog. In the former case you may rename your Autosave: .. catalog using EDIT - CATALOG PROPERTIES.

Frequency bands may not exactly be what is selectable in the resource summary Band in the table at the top of the page. It is known that some receivers are usable beyond the nominal range given in the band selection. Some of this information is provided in the table at the top after selecting an observing band, showing the 1dB and/or 3dB ranges. But this information may have been updated with new insight and not made it percolate through in the web application. When in doubt about using these extended tuning ranges ask the friendly NRAO staff. Always check the EVLA web page (https://science.nrao.edu/facilities/evla) for the latest news, e.g., on the number of available EVLA receivers on the array.

Connect with NRAO

The NSF National Radio Astronomy Observatory and NSF Green Bank Observatory are facilities of the U.S. National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

Founded in 1956, the NSF NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NSF NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NSF NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NSF NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media.

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