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We report a detailed analysis of the emission behaviour of the fivecomponent, core-double cone, pulsar J2006$-$0807 (B2003$-$08). The singlepulses revealed the presence of the three major phenomena of subpulse drifting,nulling and mode changing. The pulsar switched between four different emissionmodes, two of which showed systematic drifting with prominent drift bands, andwere classified as modes A and B respectively. The drifting was seen primarilyin the conal components and exhibited the rare phenomenon of bi-drifting, wherethe drift direction in the second component was opposite to the fourthcomponent. This made PSR J2006$-$0807 the only known example where systematicdrift bands were seen around a central core emission. The emission showed agradual decrease in intensity during mode A which stabilised to a relativelyconstant level in the subsequent mode B. The presence of a low frequency, weakand wide structure in the fluctuation spectra was also seen primarily in thecore component during modes A and B. The core component vanished during mode Cand was most prominent during the fourth mode D. Both these modes werefrequently interspersed with null pulses. No detectable drifting was seenduring modes C and D, but the pulsar showed short duration periodic nulling inthe core as well as the conal components. In addition to the four emissionmodes the pulsar also nulled for long durations lasting up to hundred rotationperiods.

Subpulse Drifting, Nulling and Mode changing in PSR J2006$-$0807 with Core emission