  We have observed the pulsar in the Crab Nebula at high radio frequencies and
high time resolution. We present continuously sampled data at 640-ns time
resolution, and individual bright pulses recorded at down to 0.25-ns time
resolution. Combining our new data with previous data from our group and from
the literature shows the dramatic changes in the pulsar's radio emission
between low and high radio frequencies. Below about 5 GHz the mean profile is
dominated by the bright Main Pulse and Low-Frequency Interpulse. Everything
changes, however, above about 5 GHz; the Main Pulse disappears, the mean
profile of the Crab pulsar is dominated by the High-Frequency Interpulse (which
is quite different from its low-frequency counterpart) and the two
High-Frequency Components. We present detailed observational characteristics of
these different components which future models of the pulsar's magnetosphere
must explain.
