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The Karlsruhe Institute of Technology (KIT) will utilize PSI-developed cavity beam position monitors (CBPMs) for the cSTART storage ring transfer line. This contribution presents beam tests of these CBPMs at the Swiss Light Source injector linac, characterizing performance ahead of cSTART commissioning in 2027. While based on SwissFEL designs, the cSTART CBPMs are adapted for single-bunch operation at 10 Hz with 1–500 pC charge. Resolution requirements for cSTART are <10 μm RMS (10–500 pC) over a 2 mm range, compared to SwissFEL's <1 μm RMS (10–200 pC) over 1 mm. While SwissFEL has six ADCs per 3.3 GHz CBPM to resolve position and charge for individual bunches at 28 ns spacing in the linac and transfer lines, the cSTART version adopts a 3.3 GHz pickup with a loaded quality factor increased from 40 to ~250. This longer signal decay enables more cost-effective 4.9 GHz SwissFEL undulator BPM electronics (adapted to 3.3 GHz); these use three ADC channels per BPM to sample an IF of ~135 MHz, eliminating analog IQ downconversion.
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