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The Baryon Mapping eXperiment (BMX) is an interferometric array designed as apathfinder for a future post-reionization 21 cm intensity mapping survey. Itconsists of four 4-meter parabolic reflectors each having offset pyramidal hornfeed, quad-ridge orthomode transducer, temperature-stabilized RF amplificationand filtering, and pulsed noise injection diode. An undersampling readoutscheme uses 8-bit digitizers running at 1.1 Gsamples/sec to provide access tosignals from 1.1 - 1.55 GHz (third Nyquist zone), corresponding to HI emissionfrom sources at redshift $0 < z < 0.3$. An FX correlator is implemented in GPUand generates 28 GB/day of time-ordered visibility data. About 7,000 hours ofdata were collected from Jan. 2019 - May 2020, and we will present results onsystem performance including sensitivity, beam mapping studies, observations ofbright celestial targets, and system electronics upgrades. BMX is a pathfinderfor the proposed PUMA intensity mapping survey in the 2030s.

The Baryon Mapping Experiment (BMX), a 21cm intensity mapping pathfinder