1-9 Chapter 1 System Overview
1.4 Transmitter Receiver Units
The transmitter-receiver unit generates radar signals for transmission, amplifies and
demodulates received signals. It sends the radar video signals to the display unit along with
the transmission timing signals and antenna rotation signals.
Four types of transmitter-receiver units are available, which are suited to different uses:
1) X band Magnetron 10 kW type: Compact and lightweight
2) X band Magnetron 25 kW type: High resolution, high sensitivity
3) S band Magnetron 30 kW type: All-weather type
4) S band Solid State 250 W type: All-weather, high durability
The X band 25 kW type and the S band 30 kW type are available as either a 2-unit type, in
which the transmitter-receiver unit is built into the scanner unit, or a 3-unit type, which has a
separate transmitter-receiver unit to be installed inside the cabin. The S band solid state
250W type and X band 10 kW type are only available as a 2-unit type.
For the 3-unit types, radio wave signals are fed between the indoor transmitter-receiver
unit and the outdoor scanner unit through a waveguide for the X band types or a coaxial tube
for the S band type.
S-band Magnetron 30kW Transmitter-Receiver Unit: NTG-3230 (for NKE-1139 Scanner Unit)
X-band Magnetron 25kW Transmitter-Receiver Unit: NTG-3225 (for NKE-1129 Scanner Unit)
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