  We report multi-frequency observations of large radio galaxies 3C 35 and 3C
284. The low-frequency observations were done with Giant Metrewave Radio
Telescope starting from $\sim$150 MHz, and the high-frequency observations were
done with the Very Large Array. We have studied the radio morphology of these
two sources at different frequencies. We present the spectral ageing map using
two of the most widely used models, the Kardashev-Pacholczyk and Jaffe-Perola
models. Another more realistic and complex Tribble model is also used. We also
calculate the jet-power and the speed of the radio lobes of these galaxies. We
check for whether any episodic jet activity is present or not in these galaxies
and found no sign of such kind of activity.
