Sporadic radio frequency interference (RFI) can be troublesome at frequencies of 1.7 GHz and lower. Even if the RFI lies outside the frequencies recorded on the VLBI tape, it could either corrupt the system temperatures needed to calibrate single-antenna VLBI observations and measured using the VLA's frontend filters (see Section 13); or corrupt the phasing of the VLA for phased-array observations (see Section 9.2). Hence, at these long wavelengths one RFI remedy is to adopt a nonstandard VLBI setup that requests frontend and backend filters just wide enough to pass the required recorded bandwidth. For example, an extragalactic HI absorption program recording 8 MHz per polarization could be run with backend filters as narrow as 12.5 MHz per polarization; for comparison, the standard action, defined to permit broadband recordings, would be to use 50 MHz backend filters (see Table 2). As another example, at 0.33 GHz it is essential to insert 25 MHz frontend filters to avoid gain compression; thus the standard given in Table 2 adopts a matching backend bandwidth of 25 MHz. The frequencies passed by the frontend filters are related to the frequencies passed by the backend filters, so selection of nonstandard VLBI setups must be done very carefully to ensure that the correct range of frequencies is recorded. See Section 13 for further details. Another RFI remedy available to phased-array observers is discussed in Section 9.2.