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This Resolution Team 3 (RT-3) report contains the results of theinvestigation of key aspects of the proposed Sample Clock Frequency Offset(SCFO) scheme for the Mid SKA1 telescope. This is a scheme, first proposed byone author (Carlson) at a meeting at the SKAO 25-Jan-2013, to digitize theanalog signal at each antenna at a slightly different sample rate and transmitthe data to the CSP Mid.CBF for subsequent digital re-sampling to a commonsample clock frequency before channelization, correlation, and beamforming. Theprimary purpose for doing this is to cause de-correlation of sampleclock-related self-interference to be able to improve correlated and beamformedsignal quality. This report includes an investigation of the efficacy of themethod, investigation of its implementation by SADT, DISH, and CSP,presentation of further supporting modeling results augmenting the originalmodeling work, a note on expansion to SKA-2, as well as possible draw-backs andconcerns. Finally, there are potential additional benefits in signal quality inimplementing the SCFO scheme, in particular de-correlation of aliased RFI(particularly for Nyquist Zone-2 digitized signals) as well as relaxation ofsignal-chain anti-aliasing filters transition band roll-off and reject bandattenuation prior to digitization in the antenna.

Sample clock frequency offset (SCFO) Resolution Team 3 (RT-3) investigation