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The redshifted 21cm line of neutral hydrogen (HI), potentially observable atlow radio frequencies (~50-200 MHz), should be a powerful probe of the physicalconditions of the inter-galactic medium during Cosmic Dawn and the Epoch ofReionisation (EoR). The sky-averaged HI signal is expected to be extremely weak(~100 mK) in comparison to the foreground of up to 10000 K at the lowestfrequencies of interest. The detection of such a weak signal requires anextremely stable, well characterised system and a good understanding of theforegrounds. Development of a nearly perfectly (~mK accuracy) calibrated totalpower radiometer system is essential for this type of experiment. We presentthe BIGHORNS (Broadband Instrument for Global HydrOgen ReioNisation Signal)experiment which was designed and built to detect the sky-averaged HI signalfrom the EoR at low radio frequencies. The BIGHORNS system is a mobile totalpower radiometer, which can be deployed in any remote location in order tocollect radio-interference (RFI) free data. The system was deployed in remote,radio quiet locations in Western Australia and low RFI sky data have beencollected. We present a description of the system, its characteristics, detailsof data analysis and calibration. We have identified multiple challenges toachieving the required measurement precision, which triggered two majorimprovements for the future system.

BIGHORNS - Broadband Instrument for Global HydrOgen ReioNisation Signal