Australia Telescope Compact Array
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RFI surveys

• RFI surveys are conducted periodically. They monitor the global RFI environment over the four centimetre bands (20, 13, 6, 3cm).
• Previous RFI survey results.
• Procedure for conducting an RFI survey and to reduce the data.

External RFI

• Listing of known non-astronomical emissions found in RFI surveys or likely to affect observations.
• Search tool of ACMA licensed terrestrial emitters.(may require unix login)
• SaRFIs, search tool of possible satellite emitters.

Internal RFI

The ATCA also suffers from internal RFI, i.e. emissions from equipment working on the array while it is in operation. With the introduction of the new CABB correlator in April 2009, many old RFI sources have been removed and we have begun the process of learning what RFI is self generated.
Current self generated RFI status.

Prior to the installation of CABB in April 2009, the most significant source of internal RFI was harmonics of 128MHz appearing in observations.
This is described in this document by Neil Killeen.

Other links

• Report on ATCA RFI environment between 1-4GHz from June 2006 by Mal Smith.
• Pieflag, a Python-based tool for automatically flagging ATCA data by Enno Middelberg (see Middelberg 2006, PASA, 23, 64).
• ATNF RFI characterisation
• VLA RFI information
• Green Bank RFI monitoring