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The frequency ranges in Table 1 are included in the SDP pipeline static mask but are only applied on baselines shorter than 1 km (see Figure 4) since most of the RFI decorrelates on longer baselines. Note that this is an aggregate mask built up over time, and it is possible to recover more channels on an individual observation if manual or outlier-based flagging is used instead.

Figure 4: Fraction of time that baselines of a particular length are flagged. Note that the antenna separation axis is not linear. The time range of the observation is 2019-12-24 22:59 to 2019-12-26 04:29 UTC. The SDP calibration flag report also shows flags from calibration solutions. Horizontal lines of flags would correspond to baselines to an antenna that has been flagged either for a fraction of time or for the entire observation.

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UHF statistics

There are no satellite-based transmitters in the UHF band. The primary sources of RFI are GSM, and Digital TV transmissions (DTV). All DTV transmissions are beamed away from site, with the exception of distant transmitters which are occasionally detected - they are generally transmitted over the horizon by anomalous tropospheric ducting. It is expected that the situation will improve in future as further sites discontinue terrestrial transmission.

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