Actually it was made up of several hundred miniature antennas, individually varying their pulse frequencies to steer or focus the main beam.

This timing noise is observable as random wandering in the pulse frequency or phase.

The pulse frequency is chosen based on the static magnetic field (H) and the nuclei being measured.

The pulse frequency was set at 1.5 Hz.

This allows the power levels to be brought up more quickly and a much higher pulse frequency, often up to 120 shocks per minute.

If the bat consistently produced the same pulse frequency as it approached the target, the echoes would increase way beyond this narrow range of sensitivity.

They produce only one pulse frequency, and must detect a wide range of echo frequencies in order to calculate information about the environment.

Also, some entertainment equipment manufacturers use pulse frequencies that are higher than what the learning remote can detect and store in its memory.

Based on feedback patterns we recorded as the shields collapsed, I'd say the cannons are using a rotating pulse frequency.

It becomes increasingly difficult to take multiple samples between transmit pulses at these pulse frequencies, so range measurements are limited to short distances.