  Increasing levels of Radio Frequency Interference (RFI) are a problem for
research in radio astronomy. Various techniques to suppress RFI and extract
astronomical signals from data affected by interference are being tried out.
However, extracting weak astronomical signals in the spectral region affected
by RFI remains a technological challenge. In this paper, we describe the
construction of an experimental setup at the Raman Research Institute (RRI),
Bangalore, India for research in RFI mitigation. We also present some results
of tests done on the data collected using this setup. The experimental setup
makes use of the 1.42 GHz receiver system of the 10.4 m telescope at RRI. A new
reference antenna, its receiver system and a backend for recording digitized
voltage together with the 1.42 GHz receiver system form the experimental setup.
We present the results of the characterization of the experimental setup. An
off-line adaptive filter was successfully implemented and tested using the data
obtained with the experimental setup.
