| The pulses of a primary radar are variably pulse-modulated, the pulses of a secondary radar are statically amplitude-modulated |
| The pulses of a primary radar are variably amplitude-modulated, the pulses of a secondary radar are statically pulse-modulated |
| The primary radar is displayed on a computer screen, the secondary radar on a radar strip |
| The pulses of a primary radar are reflected by the aircraft's surface, the pulses of a secondary radar system are answered by a transponder |
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