
THE RADAR SYSTEM - OPERATIONAL PRINCIPLES
29
to both transmitter and receiver. It would thus appear
that the powerful pulses generated by the transmitter
might be able to pass directly into the receiver. The
receiver is protected from this by a device known as a
transmit/receive switch (or T/R cell) which is situated in
the waveguide immediately before the input to the
receiver. The T/R cell blocks the input to the receiver
during transmission; it will be discussed further in
Section 2.5.
In effect there are thus two inputs to the receiver, the
received signals from the aerial and the trigger pulse to
initiate sea clutter suppression. The outpu ...