  LS 5039, a possible black hole x-ray binary, was recently observed with Giant
Meterwave Radio Telescope. The observed spectrum presented here shows that the
spectrum is inverted at the low frequency. When combined with the archival data
with orbital phase similar to the present observations, it shows a clear
indication of a spectral turnover. The combined data are fitted with a broken
power-law and the break frequency signifies a possible spectral turnover of the
spectrum around 964 MHz. Truly simultaneous observations in radio wavelength
covering a wide range of frequencies are required to fix the spectrum and the
spectral turn over which will play a crucial role in developing a deeper
understanding of the radio emitting jet in LS 5039.
