JRC JMR-92 Series Field Service Manual page 76

A part of the signal is reflected from a target and received by the antenna. The signal received by
the antenna propagates the coaxial cable which is the same as transmitting, and it is input to
receiver unit of the TRX module as the reception signal via the circulator.
After amplification the signal level by Low Noise Amplifier, the reception RF signal that is input to
the receiver unit is downconverted into the reception IF signal by frequency converter unit. Then it
is amplified to desired signal level again, flows into the AD converter via the BPF of the radar
processor.
The digital signal that has converted by the AD converter is supplied to the Radar processor, and
it undergoes the digital signal processing such as pulse compression processing, coherent
integration processing, and, P0N and Q0N transmission synthesis processing. After conversion
into analog signal by the DA converter, this processed digital signal is input to the display unit as
the radar video signal. Simultaneously, the bearing pulse signal, the heading line signal, and the
transmission trigger signal are input together.
The performance monitor function that monitors the degradation state of transmission and
reception performance of the radar equipment is follows. In order to monitor the transmission
system, the level detector unit monitors the output level of the power amplifier unit. In order to
monitor the reception system, the radar antenna monitors the reception level of the PM signal
which is emitted to the air by the TRX module via the PM antenna CAY-77.
Since AC power for the motor driven is supplied via the safety switch, it can be forced outage of
the motor when it is turned off under maintenance. The state of the safety switch is always
monitored as the status signal, and it is sent to the display unit. Though the motor and motor
driver circuit are varied by the Radar antenna type, the setting of motor power 100Vac or 220Vac
is set by jumper plug of the motor driver circuit.
Chapter 2 System Configuration 2-18