  We report on a detailed analysis of the radio emission during the different
modes of the pulsar J0826+2637 (B0823+26), observed using the Giant Meterwave
Radio Telescope at 306-339 MHz observing frequencies. The pulsar profile has a
postcursor and interpulse emission in addition to the main pulse. The single
pulses showed the presence of nulling, periodic fluctuation in the emission as
well as two prominent modes. In addition the pulsar also showed the presence of
a null state where no emission was seen for roughly an hour which was
immediately followed by a short duration ($\sim$5 minutes) bright state termed
the Q-bright state. The nulling varied significantly in the two modes, from a
few percent nulls in B-mode to more than 90 percent nulling during the Q-mode.
Additionally, the pulsar showed the presence of low level emission in both the
interpulse and postcursor components when the main pulse nulled in B-mode. We
detected periodic fluctuations in both the main pulse and postcursor during
B-mode which were most likely a form of periodic amplitude modulation unrelated
to subpulse drifting. We have also detected the appearance of periodicity
during the transitions from the null to the burst states in the Q-mode, which
was longer than the B-mode modulations. Our analysis further revealed a
significant increase in the main pulse and post-cursor intensity during the
transition from the Q-mode to the short duration Q-bright mode. On the other
hand no commensurate variation was visible in the interpulse intensity.
