Technical Manual

SRT X-BAND RADAR SYSTEMS
FUNCTIONAL DESCRIPTION
304202P003 3.10 Rev. C
The signals TRPS and TRPL are applied to the DRIVER which generates the
signals TRPUSH and TRPULL for the Pulse Generator circuit of the SRT_Mos
Board.
3.2.1.7 System Monitor Functions
System state monitor (Chapter 9, Figure 9.1.22) is performed by this unit. Unit is
composed of :
− Voltage Monitor
− Temperature Monitor
− SLK
− Safety switch
Voltage monitor performs monitoring of power supply voltage level. It receives
its inputs from the Voltage sensor of the SRT_Power Board.
Temperature monitor detects temperature value to be processed by the
microprocessor. In case of high value the microprocessor generates the signals
for switching the fan on through the Gate Array.
SLK is a signal from switch that disables transmission and antenna rotation
when the apparatus cover is open.
Safety switch disables the radar unit from hazardous power supply. The safety
switch must be operated when radar unit is under maintenance to prevent high
voltage hazard for operators.
3.2.1.8 Performance Monitor Functions
The Performance Monitor’s function is to monitor Transmission Power, Tuning
and Noise Figure in order to result in a Noise Ring presentation on PPI and for
to have the peak power value on TXRX DATA.
In the related circuit there is a diode, put inside the RF Head, operating as a
revelator when the magnetron send the power in output or as noise generator
when the signal PM_Out is available.
When the diode is operating as revelator, it is synchronized with the
transmission and the revelator circuit can detect the power present at the diode;
this circuit is always activated, the measurement is made every trigger and the
measured value is available on TXRX data.
When the command PMON, Performance Monitor ON, is inserted, the power
value and the tuning value are arranged to change PM_Out signal parameters.
The scope of this circuit is to introduce a noise ring on PPI. This noise ring
change its distance by the variation of the transmitting power and its thickness
by the variation of the tuning.
A neon lamp, placed in front of the Antenna, on a monitor arm extending from
the antenna pedestal, powered by 150 Voltage forwarded by POWER MOS