User's Manual

30 kW S-BAND/U ANTENNA GROUP
FUNCTIONAL DESCRIPTION
3.2 Rev. C
assemblies are referred to schematic diagrams.
NOTE
The schematic block diagrams of Chapter 3 show all the
functions that the hardware boards could potentially support,
while the related functional description refers only to the
functions implemented in the customised present configuration.
3 .2 Funct iona l de script ion
The functional block diagram of the 30 kW S-BAND/U Antenna Group
equipment is shown in Chapter 9, Figure 9.1.9.
Each block represents a functional area, which is described in detail in the
following function of the present chapter. The blocks indicated by dotted lines
represent circuits assembled on the chassis of the Unit.
Basically, the unit performs the following functions:
- it generates the power supply voltages required for they unit
functioning
- it generates the R.F. pulses which will be radiated by the
Antenna; the pulses, in S-band wave length (3050 ±30 MHz)
and with 30 kW peak nominal power, can be selected
among the following:
PULSE TYPE DURATION PRF
SHORT PULSE nominal 60 ns 3000 Hz
MEDIUM PULSE nominal 250 ns 1500 Hz
LONG PULSE nominal 800 ns 750 Hz
- it receives the echoes reflected from targets and it converts
and amplifies them
- it monitors the correct operations of Unit
The Electronic provides, as well, the proper DC Power Supply voltages: +15V, -
15V, +5V, (LVPS area in RTM CONT B Board), and the High Voltages, (HVPS
area in POWER MOS Board). The Electronic Assy, also contains, on RTM
CONT B Board, the circuit to generate the DC voltage for heating the
Magnetron Filament (VFIL).
The Electronic, (RTM CONT B Board), generates the Trigger signal and the
Trigger pulse required to drive the Modulator circuitry, (POWER MOS Board).
For every pulse supplied, the Modulator powers the Magnetron cathode with a
High Voltage pulse which causes it to oscillate for the pulse duration time, in
accordance with the range scale selected by the operator, (Short, Medium,
Long Pulse). R.F. pulses generation is performed by the Magnetron inside the
"R.F. HEAD" block.
The Magnetron output R.F. signal is sent to the Antenna via the Circulator and
the waveguide path.