7.2 Antenna Unit
7-9
1. TX trigger
Four triggers different in pulse length to each drive circuit of the MD board. These
outputs are combined to create high-voltage TX pulses. The waveform of short and
middle TX pulses is a triangular wave. In signal processing, it allows suppressing
relatively weaker echoes such as sea clutter on short range. The photos below show
examples of waveforms of detected TX output of the X-band/25 kW radar.
The pulse length at the point 3 dB below the peak is defined as the pulse length.
200 ns/div
1.32 us
40 ns/div
100 ns/div
0.18 us
0.5 us
Photo 7.2.1
(e.g.) Waveform of 25 kW S1 pulse TX output
Photo 7.2.2
(e.g.) Waveform of 25 kW M1 pulse TX output
Photo 7.2.3
(e.g.) Waveform of 25 kW L pulse TX output
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