TM11-5840-360-14-1-1
CHAPTER 4. FUNCTIONAL DESCRIPTION
4.1 GENERAL
the antenna; the video output and the acknowledge
pulse to the indicator; and the ship's power (fused) to the
The theory of operation for Radar Set
antenna motor.
AN/SPS64(V) is presented in three forms: system block
A functional block diagram of the receiver
diagram descriptions; functional block diagram
transmitter is shown in Figure 4-1. A description of the
descriptions; and detailed circuit descriptions.
receiver transmitter subassemblies, subdivided
System block diagram descriptions are given in
functionally and keyed to Figure 4-1, is given below:
(AN/SPS-64(V)1),
(AN/SPS-64(V)2),
4.2.1 Pulse Generation and Receiver Control Circuits
(AN/SPS-64(V)3) and 1.9.3 (AN/SPS-64(V) 4).
The pulse generation and receiver control
This chapter contains functional block diagram
circuits establish the pulse width for the transmitter and
descriptions for the major components of the radar sets.
select either narrow or wide bandwidth for the receiver.
The applicable paragraphs and the components covered
The circuits also determine sensitivity threshold control
are listed below:
recovery start timing to control receiver short range
gain.
Paragraph
Component
The trigger for the transmitter is received from
the indicator at the proper PRF for the selected range.
Receiver Transmitter RT-1240
The medium pulse enable and long pulse enable signals
Antenna AS-3194 and Antenna Pedestal
control the pulse width decoder to determine which of
AB-1247/AB-1247A
the pulse generators (one-shot multivibrators) is
Azimuth Range Indicators IP-1282/IP-
enabled. The trigger pulse is routed through the trigger
1283
delay generator to allow enough time for the STC
Switching Units SA-2139 (V3, V4) and
generator circuit to begin developing the STC
SA-2156 (V2)
waveform. The resulting delayed trigger is applied to
Interface Unit J-3463 (V2)
the short pulse generator. Its output is applied to the
Wave Guide Switch SA-2140 (V2)
long and medium pulse generators. The longest pulse
Video Amplifier AM-6932 (V2, V3,V4)
present at the pulse width gate input is gated through.
Receiver Transmitter RT-1241 (V4)
Antenna AS-3195 and Antenna Pedestal
The output of the pulse width gate is routed to
AB-1248 (V4)
the amplifier driver which amplifies the pulse to drive
Signal Data Converter CV-3442 (V4)
the modulator.
Control Indicator C-10260 (V4)
Each of the pulse widths is independently
Amplifier-Generator AM-6933 (V4)
adjustable: short pulse (R28); medium pulse (R23); and
long pulse (R25).
Detailed circuit descriptions of each electronic
During short pulse operation the pulse width
subassembly are presented in Chapter 6 of this manual
decoder switches the receiver IF bandwidth to 24 MHz,
with accompanying schematic diagrams.
During medium and long pulse operation the IF
bandwidth is 4 MHz. Bandwidth relay K3, in addition to
4.2 RECEIVER TRANSMITTER RT-1240
switching the IF bandwidth, reduces the magnetron
filament voltage during medium and long pulse
The modulator, transmitter, and receiver
operation.
sections of Radar Set AN/SPS-64(V) are contained in
The non-delayed indicator trigger is applied
the receiver transmitter. Solid-state electronics are
through the STC delay generator to the STC integrator-
utilized throughout except for the magnetron and the
amplifier. The output of the integrator-amplifier, the
hard-tube modulator. The primary functions of the
delayed STC waveform is applied to the IF amplifier to
receiver transmitter are to generate and transmit a train
control short range gain of the receiver. The slope of
of short pulses and to amplify the echoes received by
the STC waveform trailing edge is set by STC Law
the antenna.
control R57 and the indicator ANTI-CLUTTER SEA
The receiver transmitter inputs are: the trigger
control. The STC waveform can be adjusted to
and control signals from the indicator; the microwave
approximately a 4 mile range to control short range
signal returns from the antenna; and ship's power. The
gain.
receiver transmitter outputs are: the transmitter pulse to
Table 4-1. Transmitter Drive Pulse Selection
Command Medium Command Long Pulse Generator Medium Pulse Generator Long Drive Pulse
High
High
Disabled
Disabled
Short
High
Low
Disabled
Enabled
Long
Low
High
Enabled
Disabled
Medium
4-1
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