Technical Manual

SRT X-BAND RADAR SYSTEMS
FUNCTIONAL DESCRIPTION
304202P003 3.11 Rev. C
Board, is excited at each antenna scan by the radiated RF pulse energy, any
time the RF beam crosses over.
The result is, that when the Performance Monitor is switched on and the neon
lamp is radiated by the Magnetron RF, the RF energy causes a current variation
on neon lamp and on RM signal. A revelator circuit provides to detect this
variation that interrupts the Noise Ring
This function supplies to a general verification of the output power sent out.
3.2.1.9 Input and Output interface
The Input interface of the SRT_Control board receives input signals from SRT
Power, SRT MOS, RF Detector, Safety Switch, interlock and forwards them to
the microprocessor and to the gate array. Signal conditioning and level shifting
operation is accomplished by buffers, level translators and peak hold devices.
Azimuth (AZ-in) and Heading Line (HL-in) input signals are processed as well
and forwarded to the microprocessor and the gate array (AZ, HL)
The Output interface forwards processed signals from Gate Array, RF Detector,
Safety Switch and from the TX pin of the microprocessor to the Display, the RF
detector and the brushless motor controller.
3.2.1.10 Azimuth (AZ) and Heading Line (HL)
Signal Circuit Generator
The Antenna Unit must constantly forward its Azimuth position and Heading
Line to the Display Unit. The function of this circuit (Chapter 9, Figure 9.1.30) is
to process the incoming signals AZIN and HLIN and forward them to the
Microprocessor the signal AZ and HL for the blanking function.
The output signal AZOUT and HLOUT are used on the Display Unit.
3.2.2 RF HEAD
The RF Head (Chapter 9, Figure 9.1.23) is composed of a solid state controlled
MAGNETRON stage connected to a CIRCULATOR and ending with a flange to
be connected to a waveguide in order to transfer the RF PULSE to the Antenna
for it to be radiated. In the 25 kW system, there is also a Band Pass FILTER
included between the magnetron and the circulator to filter out spurious
frequency emissions.
The opposite end of the CIRCULATOR is fitted with the LIMITER, the
RF_Amplifer (L.N.F.E + RF_Detector). L.N.F.E (Low Noise and Front End) is
composed of: the IMAGE REJECTION FILTER, the LOW NOISE AMPLIFIER,